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Build and install from GOPATH

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* Rename 'vendor/src' -> 'vendor'
  * Ignore vendor/ instead of vendor/src/ for lint
* Rename 'cmd/client' -> 'cmd/ocic' to make it 'go install'able
* Rename 'cmd/server' -> 'cmd/ocid' to make it 'go install'able
* Update Makefile to build and install from GOPATH
* Update tests to locate ocid/ocic in GOPATH/bin
* Search for binaries in GOPATH/bin instead of PATH
* Install tools using `go get -u`, so they are updated on each run

Signed-off-by: Jonathan Yu <jawnsy@redhat.com>
This commit is contained in:
Jonathan Yu 2017-01-17 11:57:35 -08:00
parent 9da2882d49
commit 6c9628cdb1
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GPG key ID: F3C2F688A21CB648
1111 changed files with 70 additions and 61 deletions
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vendor/github.com/containers/storage/drivers/aufs/aufs.go generated vendored Normal file
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// +build linux
/*
aufs driver directory structure
.
├── layers // Metadata of layers
│ ├── 1
│ ├── 2
│ └── 3
├── diff // Content of the layer
│ ├── 1 // Contains layers that need to be mounted for the id
│ ├── 2
│ └── 3
└── mnt // Mount points for the rw layers to be mounted
├── 1
├── 2
└── 3
*/
package aufs
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/vbatts/tar-split/tar/storage"
"github.com/containers/storage/drivers"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/directory"
"github.com/containers/storage/pkg/idtools"
mountpk "github.com/containers/storage/pkg/mount"
"github.com/containers/storage/pkg/stringid"
"github.com/opencontainers/runc/libcontainer/label"
rsystem "github.com/opencontainers/runc/libcontainer/system"
)
var (
// ErrAufsNotSupported is returned if aufs is not supported by the host.
ErrAufsNotSupported = fmt.Errorf("AUFS was not found in /proc/filesystems")
// ErrAufsNested means aufs cannot be used bc we are in a user namespace
ErrAufsNested = fmt.Errorf("AUFS cannot be used in non-init user namespace")
backingFs = "<unknown>"
enableDirpermLock sync.Once
enableDirperm bool
)
func init() {
graphdriver.Register("aufs", Init)
}
// Driver contains information about the filesystem mounted.
type Driver struct {
sync.Mutex
root string
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
ctr *graphdriver.RefCounter
pathCacheLock sync.Mutex
pathCache map[string]string
}
// Init returns a new AUFS driver.
// An error is returned if AUFS is not supported.
func Init(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
// Try to load the aufs kernel module
if err := supportsAufs(); err != nil {
return nil, graphdriver.ErrNotSupported
}
fsMagic, err := graphdriver.GetFSMagic(root)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
switch fsMagic {
case graphdriver.FsMagicAufs, graphdriver.FsMagicBtrfs, graphdriver.FsMagicEcryptfs:
logrus.Errorf("AUFS is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
paths := []string{
"mnt",
"diff",
"layers",
}
a := &Driver{
root: root,
uidMaps: uidMaps,
gidMaps: gidMaps,
pathCache: make(map[string]string),
ctr: graphdriver.NewRefCounter(graphdriver.NewFsChecker(graphdriver.FsMagicAufs)),
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the root aufs driver dir and return
// if it already exists
// If not populate the dir structure
if err := idtools.MkdirAllAs(root, 0700, rootUID, rootGID); err != nil {
if os.IsExist(err) {
return a, nil
}
return nil, err
}
if err := mountpk.MakePrivate(root); err != nil {
return nil, err
}
// Populate the dir structure
for _, p := range paths {
if err := idtools.MkdirAllAs(path.Join(root, p), 0700, rootUID, rootGID); err != nil {
return nil, err
}
}
return a, nil
}
// Return a nil error if the kernel supports aufs
// We cannot modprobe because inside dind modprobe fails
// to run
func supportsAufs() error {
// We can try to modprobe aufs first before looking at
// proc/filesystems for when aufs is supported
exec.Command("modprobe", "aufs").Run()
if rsystem.RunningInUserNS() {
return ErrAufsNested
}
f, err := os.Open("/proc/filesystems")
if err != nil {
return err
}
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
if strings.Contains(s.Text(), "aufs") {
return nil
}
}
return ErrAufsNotSupported
}
func (a *Driver) rootPath() string {
return a.root
}
func (*Driver) String() string {
return "aufs"
}
// Status returns current information about the filesystem such as root directory, number of directories mounted, etc.
func (a *Driver) Status() [][2]string {
ids, _ := loadIds(path.Join(a.rootPath(), "layers"))
return [][2]string{
{"Root Dir", a.rootPath()},
{"Backing Filesystem", backingFs},
{"Dirs", fmt.Sprintf("%d", len(ids))},
{"Dirperm1 Supported", fmt.Sprintf("%v", useDirperm())},
}
}
// GetMetadata not implemented
func (a *Driver) GetMetadata(id string) (map[string]string, error) {
return nil, nil
}
// Exists returns true if the given id is registered with
// this driver
func (a *Driver) Exists(id string) bool {
if _, err := os.Lstat(path.Join(a.rootPath(), "layers", id)); err != nil {
return false
}
return true
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (a *Driver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
return a.Create(id, parent, mountLabel, storageOpt)
}
// Create three folders for each id
// mnt, layers, and diff
func (a *Driver) Create(id, parent, mountLabel string, storageOpt map[string]string) error {
if len(storageOpt) != 0 {
return fmt.Errorf("--storage-opt is not supported for aufs")
}
if err := a.createDirsFor(id); err != nil {
return err
}
// Write the layers metadata
f, err := os.Create(path.Join(a.rootPath(), "layers", id))
if err != nil {
return err
}
defer f.Close()
if parent != "" {
ids, err := getParentIds(a.rootPath(), parent)
if err != nil {
return err
}
if _, err := fmt.Fprintln(f, parent); err != nil {
return err
}
for _, i := range ids {
if _, err := fmt.Fprintln(f, i); err != nil {
return err
}
}
}
return nil
}
// createDirsFor creates two directories for the given id.
// mnt and diff
func (a *Driver) createDirsFor(id string) error {
paths := []string{
"mnt",
"diff",
}
rootUID, rootGID, err := idtools.GetRootUIDGID(a.uidMaps, a.gidMaps)
if err != nil {
return err
}
// Directory permission is 0755.
// The path of directories are <aufs_root_path>/mnt/<image_id>
// and <aufs_root_path>/diff/<image_id>
for _, p := range paths {
if err := idtools.MkdirAllAs(path.Join(a.rootPath(), p, id), 0755, rootUID, rootGID); err != nil {
return err
}
}
return nil
}
// Remove will unmount and remove the given id.
func (a *Driver) Remove(id string) error {
a.pathCacheLock.Lock()
mountpoint, exists := a.pathCache[id]
a.pathCacheLock.Unlock()
if !exists {
mountpoint = a.getMountpoint(id)
}
if err := a.unmount(mountpoint); err != nil {
// no need to return here, we can still try to remove since the `Rename` will fail below if still mounted
logrus.Debugf("aufs: error while unmounting %s: %v", mountpoint, err)
}
// Atomically remove each directory in turn by first moving it out of the
// way (so that docker doesn't find it anymore) before doing removal of
// the whole tree.
tmpMntPath := path.Join(a.mntPath(), fmt.Sprintf("%s-removing", id))
if err := os.Rename(mountpoint, tmpMntPath); err != nil && !os.IsNotExist(err) {
return err
}
defer os.RemoveAll(tmpMntPath)
tmpDiffpath := path.Join(a.diffPath(), fmt.Sprintf("%s-removing", id))
if err := os.Rename(a.getDiffPath(id), tmpDiffpath); err != nil && !os.IsNotExist(err) {
return err
}
defer os.RemoveAll(tmpDiffpath)
// Remove the layers file for the id
if err := os.Remove(path.Join(a.rootPath(), "layers", id)); err != nil && !os.IsNotExist(err) {
return err
}
a.pathCacheLock.Lock()
delete(a.pathCache, id)
a.pathCacheLock.Unlock()
return nil
}
// Get returns the rootfs path for the id.
// This will mount the dir at it's given path
func (a *Driver) Get(id, mountLabel string) (string, error) {
parents, err := a.getParentLayerPaths(id)
if err != nil && !os.IsNotExist(err) {
return "", err
}
a.pathCacheLock.Lock()
m, exists := a.pathCache[id]
a.pathCacheLock.Unlock()
if !exists {
m = a.getDiffPath(id)
if len(parents) > 0 {
m = a.getMountpoint(id)
}
}
if count := a.ctr.Increment(m); count > 1 {
return m, nil
}
// If a dir does not have a parent ( no layers )do not try to mount
// just return the diff path to the data
if len(parents) > 0 {
if err := a.mount(id, m, mountLabel, parents); err != nil {
return "", err
}
}
a.pathCacheLock.Lock()
a.pathCache[id] = m
a.pathCacheLock.Unlock()
return m, nil
}
// Put unmounts and updates list of active mounts.
func (a *Driver) Put(id string) error {
a.pathCacheLock.Lock()
m, exists := a.pathCache[id]
if !exists {
m = a.getMountpoint(id)
a.pathCache[id] = m
}
a.pathCacheLock.Unlock()
if count := a.ctr.Decrement(m); count > 0 {
return nil
}
err := a.unmount(m)
if err != nil {
logrus.Debugf("Failed to unmount %s aufs: %v", id, err)
}
return err
}
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (a *Driver) Diff(id, parent string) (archive.Archive, error) {
// AUFS doesn't need the parent layer to produce a diff.
return archive.TarWithOptions(path.Join(a.rootPath(), "diff", id), &archive.TarOptions{
Compression: archive.Uncompressed,
ExcludePatterns: []string{archive.WhiteoutMetaPrefix + "*", "!" + archive.WhiteoutOpaqueDir},
UIDMaps: a.uidMaps,
GIDMaps: a.gidMaps,
})
}
type fileGetNilCloser struct {
storage.FileGetter
}
func (f fileGetNilCloser) Close() error {
return nil
}
// DiffGetter returns a FileGetCloser that can read files from the directory that
// contains files for the layer differences. Used for direct access for tar-split.
func (a *Driver) DiffGetter(id string) (graphdriver.FileGetCloser, error) {
p := path.Join(a.rootPath(), "diff", id)
return fileGetNilCloser{storage.NewPathFileGetter(p)}, nil
}
func (a *Driver) applyDiff(id string, diff archive.Reader) error {
return chrootarchive.UntarUncompressed(diff, path.Join(a.rootPath(), "diff", id), &archive.TarOptions{
UIDMaps: a.uidMaps,
GIDMaps: a.gidMaps,
})
}
// DiffSize calculates the changes between the specified id
// and its parent and returns the size in bytes of the changes
// relative to its base filesystem directory.
func (a *Driver) DiffSize(id, parent string) (size int64, err error) {
// AUFS doesn't need the parent layer to calculate the diff size.
return directory.Size(path.Join(a.rootPath(), "diff", id))
}
// ApplyDiff extracts the changeset from the given diff into the
// layer with the specified id and parent, returning the size of the
// new layer in bytes.
func (a *Driver) ApplyDiff(id, parent string, diff archive.Reader) (size int64, err error) {
// AUFS doesn't need the parent id to apply the diff.
if err = a.applyDiff(id, diff); err != nil {
return
}
return a.DiffSize(id, parent)
}
// Changes produces a list of changes between the specified layer
// and its parent layer. If parent is "", then all changes will be ADD changes.
func (a *Driver) Changes(id, parent string) ([]archive.Change, error) {
// AUFS doesn't have snapshots, so we need to get changes from all parent
// layers.
layers, err := a.getParentLayerPaths(id)
if err != nil {
return nil, err
}
return archive.Changes(layers, path.Join(a.rootPath(), "diff", id))
}
func (a *Driver) getParentLayerPaths(id string) ([]string, error) {
parentIds, err := getParentIds(a.rootPath(), id)
if err != nil {
return nil, err
}
layers := make([]string, len(parentIds))
// Get the diff paths for all the parent ids
for i, p := range parentIds {
layers[i] = path.Join(a.rootPath(), "diff", p)
}
return layers, nil
}
func (a *Driver) mount(id string, target string, mountLabel string, layers []string) error {
a.Lock()
defer a.Unlock()
// If the id is mounted or we get an error return
if mounted, err := a.mounted(target); err != nil || mounted {
return err
}
rw := a.getDiffPath(id)
if err := a.aufsMount(layers, rw, target, mountLabel); err != nil {
return fmt.Errorf("error creating aufs mount to %s: %v", target, err)
}
return nil
}
func (a *Driver) unmount(mountPath string) error {
a.Lock()
defer a.Unlock()
if mounted, err := a.mounted(mountPath); err != nil || !mounted {
return err
}
if err := Unmount(mountPath); err != nil {
return err
}
return nil
}
func (a *Driver) mounted(mountpoint string) (bool, error) {
return graphdriver.Mounted(graphdriver.FsMagicAufs, mountpoint)
}
// Cleanup aufs and unmount all mountpoints
func (a *Driver) Cleanup() error {
var dirs []string
if err := filepath.Walk(a.mntPath(), func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
return nil
}
dirs = append(dirs, path)
return nil
}); err != nil {
return err
}
for _, m := range dirs {
if err := a.unmount(m); err != nil {
logrus.Debugf("aufs error unmounting %s: %s", stringid.TruncateID(m), err)
}
}
return mountpk.Unmount(a.root)
}
func (a *Driver) aufsMount(ro []string, rw, target, mountLabel string) (err error) {
defer func() {
if err != nil {
Unmount(target)
}
}()
// Mount options are clipped to page size(4096 bytes). If there are more
// layers then these are remounted individually using append.
offset := 54
if useDirperm() {
offset += len("dirperm1")
}
b := make([]byte, syscall.Getpagesize()-len(mountLabel)-offset) // room for xino & mountLabel
bp := copy(b, fmt.Sprintf("br:%s=rw", rw))
firstMount := true
i := 0
for {
for ; i < len(ro); i++ {
layer := fmt.Sprintf(":%s=ro+wh", ro[i])
if firstMount {
if bp+len(layer) > len(b) {
break
}
bp += copy(b[bp:], layer)
} else {
data := label.FormatMountLabel(fmt.Sprintf("append%s", layer), mountLabel)
if err = mount("none", target, "aufs", syscall.MS_REMOUNT, data); err != nil {
return
}
}
}
if firstMount {
opts := "dio,xino=/dev/shm/aufs.xino"
if useDirperm() {
opts += ",dirperm1"
}
data := label.FormatMountLabel(fmt.Sprintf("%s,%s", string(b[:bp]), opts), mountLabel)
if err = mount("none", target, "aufs", 0, data); err != nil {
return
}
firstMount = false
}
if i == len(ro) {
break
}
}
return
}
// useDirperm checks dirperm1 mount option can be used with the current
// version of aufs.
func useDirperm() bool {
enableDirpermLock.Do(func() {
base, err := ioutil.TempDir("", "docker-aufs-base")
if err != nil {
logrus.Errorf("error checking dirperm1: %v", err)
return
}
defer os.RemoveAll(base)
union, err := ioutil.TempDir("", "docker-aufs-union")
if err != nil {
logrus.Errorf("error checking dirperm1: %v", err)
return
}
defer os.RemoveAll(union)
opts := fmt.Sprintf("br:%s,dirperm1,xino=/dev/shm/aufs.xino", base)
if err := mount("none", union, "aufs", 0, opts); err != nil {
return
}
enableDirperm = true
if err := Unmount(union); err != nil {
logrus.Errorf("error checking dirperm1: failed to unmount %v", err)
}
})
return enableDirperm
}

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vendor/github.com/containers/storage/drivers/aufs/dirs.go generated vendored Normal file
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// +build linux
package aufs
import (
"bufio"
"io/ioutil"
"os"
"path"
)
// Return all the directories
func loadIds(root string) ([]string, error) {
dirs, err := ioutil.ReadDir(root)
if err != nil {
return nil, err
}
out := []string{}
for _, d := range dirs {
if !d.IsDir() {
out = append(out, d.Name())
}
}
return out, nil
}
// Read the layers file for the current id and return all the
// layers represented by new lines in the file
//
// If there are no lines in the file then the id has no parent
// and an empty slice is returned.
func getParentIds(root, id string) ([]string, error) {
f, err := os.Open(path.Join(root, "layers", id))
if err != nil {
return nil, err
}
defer f.Close()
out := []string{}
s := bufio.NewScanner(f)
for s.Scan() {
if t := s.Text(); t != "" {
out = append(out, s.Text())
}
}
return out, s.Err()
}
func (a *Driver) getMountpoint(id string) string {
return path.Join(a.mntPath(), id)
}
func (a *Driver) mntPath() string {
return path.Join(a.rootPath(), "mnt")
}
func (a *Driver) getDiffPath(id string) string {
return path.Join(a.diffPath(), id)
}
func (a *Driver) diffPath() string {
return path.Join(a.rootPath(), "diff")
}

21
vendor/github.com/containers/storage/drivers/aufs/mount.go generated vendored Normal file
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@ -0,0 +1,21 @@
// +build linux
package aufs
import (
"os/exec"
"syscall"
"github.com/Sirupsen/logrus"
)
// Unmount the target specified.
func Unmount(target string) error {
if err := exec.Command("auplink", target, "flush").Run(); err != nil {
logrus.Warnf("Couldn't run auplink before unmount %s: %s", target, err)
}
if err := syscall.Unmount(target, 0); err != nil {
return err
}
return nil
}

7
vendor/github.com/containers/storage/drivers/aufs/mount_linux.go generated vendored Normal file
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@ -0,0 +1,7 @@
package aufs
import "syscall"
func mount(source string, target string, fstype string, flags uintptr, data string) error {
return syscall.Mount(source, target, fstype, flags, data)
}

12
vendor/github.com/containers/storage/drivers/aufs/mount_unsupported.go generated vendored Normal file
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@ -0,0 +1,12 @@
// +build !linux
package aufs
import "errors"
// MsRemount declared to specify a non-linux system mount.
const MsRemount = 0
func mount(source string, target string, fstype string, flags uintptr, data string) (err error) {
return errors.New("mount is not implemented on this platform")
}

520
vendor/github.com/containers/storage/drivers/btrfs/btrfs.go generated vendored Normal file
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@ -0,0 +1,520 @@
// +build linux
package btrfs
/*
#include <stdlib.h>
#include <dirent.h>
#include <btrfs/ioctl.h>
#include <btrfs/ctree.h>
static void set_name_btrfs_ioctl_vol_args_v2(struct btrfs_ioctl_vol_args_v2* btrfs_struct, const char* value) {
snprintf(btrfs_struct->name, BTRFS_SUBVOL_NAME_MAX, "%s", value);
}
*/
import "C"
import (
"fmt"
"os"
"path"
"path/filepath"
"strings"
"syscall"
"unsafe"
"github.com/containers/storage/drivers"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/mount"
"github.com/containers/storage/pkg/parsers"
"github.com/docker/go-units"
"github.com/opencontainers/runc/libcontainer/label"
)
func init() {
graphdriver.Register("btrfs", Init)
}
var (
quotaEnabled = false
userDiskQuota = false
)
type btrfsOptions struct {
minSpace uint64
size uint64
}
// Init returns a new BTRFS driver.
// An error is returned if BTRFS is not supported.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsMagic != graphdriver.FsMagicBtrfs {
return nil, graphdriver.ErrPrerequisites
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
if err := idtools.MkdirAllAs(home, 0700, rootUID, rootGID); err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
opt, err := parseOptions(options)
if err != nil {
return nil, err
}
if userDiskQuota {
if err := subvolEnableQuota(home); err != nil {
return nil, err
}
quotaEnabled = true
}
driver := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
options: opt,
}
return graphdriver.NewNaiveDiffDriver(driver, uidMaps, gidMaps), nil
}
func parseOptions(opt []string) (btrfsOptions, error) {
var options btrfsOptions
for _, option := range opt {
key, val, err := parsers.ParseKeyValueOpt(option)
if err != nil {
return options, err
}
key = strings.ToLower(key)
switch key {
case "btrfs.min_space":
minSpace, err := units.RAMInBytes(val)
if err != nil {
return options, err
}
userDiskQuota = true
options.minSpace = uint64(minSpace)
default:
return options, fmt.Errorf("Unknown option %s", key)
}
}
return options, nil
}
// Driver contains information about the filesystem mounted.
type Driver struct {
//root of the file system
home string
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
options btrfsOptions
}
// String prints the name of the driver (btrfs).
func (d *Driver) String() string {
return "btrfs"
}
// Status returns current driver information in a two dimensional string array.
// Output contains "Build Version" and "Library Version" of the btrfs libraries used.
// Version information can be used to check compatibility with your kernel.
func (d *Driver) Status() [][2]string {
status := [][2]string{}
if bv := btrfsBuildVersion(); bv != "-" {
status = append(status, [2]string{"Build Version", bv})
}
if lv := btrfsLibVersion(); lv != -1 {
status = append(status, [2]string{"Library Version", fmt.Sprintf("%d", lv)})
}
return status
}
// GetMetadata returns empty metadata for this driver.
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
return nil, nil
}
// Cleanup unmounts the home directory.
func (d *Driver) Cleanup() error {
if quotaEnabled {
if err := subvolDisableQuota(d.home); err != nil {
return err
}
}
return mount.Unmount(d.home)
}
func free(p *C.char) {
C.free(unsafe.Pointer(p))
}
func openDir(path string) (*C.DIR, error) {
Cpath := C.CString(path)
defer free(Cpath)
dir := C.opendir(Cpath)
if dir == nil {
return nil, fmt.Errorf("Can't open dir")
}
return dir, nil
}
func closeDir(dir *C.DIR) {
if dir != nil {
C.closedir(dir)
}
}
func getDirFd(dir *C.DIR) uintptr {
return uintptr(C.dirfd(dir))
}
func subvolCreate(path, name string) error {
dir, err := openDir(path)
if err != nil {
return err
}
defer closeDir(dir)
var args C.struct_btrfs_ioctl_vol_args
for i, c := range []byte(name) {
args.name[i] = C.char(c)
}
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.BTRFS_IOC_SUBVOL_CREATE,
uintptr(unsafe.Pointer(&args)))
if errno != 0 {
return fmt.Errorf("Failed to create btrfs subvolume: %v", errno.Error())
}
return nil
}
func subvolSnapshot(src, dest, name string) error {
srcDir, err := openDir(src)
if err != nil {
return err
}
defer closeDir(srcDir)
destDir, err := openDir(dest)
if err != nil {
return err
}
defer closeDir(destDir)
var args C.struct_btrfs_ioctl_vol_args_v2
args.fd = C.__s64(getDirFd(srcDir))
var cs = C.CString(name)
C.set_name_btrfs_ioctl_vol_args_v2(&args, cs)
C.free(unsafe.Pointer(cs))
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(destDir), C.BTRFS_IOC_SNAP_CREATE_V2,
uintptr(unsafe.Pointer(&args)))
if errno != 0 {
return fmt.Errorf("Failed to create btrfs snapshot: %v", errno.Error())
}
return nil
}
func isSubvolume(p string) (bool, error) {
var bufStat syscall.Stat_t
if err := syscall.Lstat(p, &bufStat); err != nil {
return false, err
}
// return true if it is a btrfs subvolume
return bufStat.Ino == C.BTRFS_FIRST_FREE_OBJECTID, nil
}
func subvolDelete(dirpath, name string) error {
dir, err := openDir(dirpath)
if err != nil {
return err
}
defer closeDir(dir)
fullPath := path.Join(dirpath, name)
var args C.struct_btrfs_ioctl_vol_args
// walk the btrfs subvolumes
walkSubvolumes := func(p string, f os.FileInfo, err error) error {
if err != nil {
if os.IsNotExist(err) && p != fullPath {
// missing most likely because the path was a subvolume that got removed in the previous iteration
// since it's gone anyway, we don't care
return nil
}
return fmt.Errorf("error walking subvolumes: %v", err)
}
// we want to check children only so skip itself
// it will be removed after the filepath walk anyways
if f.IsDir() && p != fullPath {
sv, err := isSubvolume(p)
if err != nil {
return fmt.Errorf("Failed to test if %s is a btrfs subvolume: %v", p, err)
}
if sv {
if err := subvolDelete(path.Dir(p), f.Name()); err != nil {
return fmt.Errorf("Failed to destroy btrfs child subvolume (%s) of parent (%s): %v", p, dirpath, err)
}
}
}
return nil
}
if err := filepath.Walk(path.Join(dirpath, name), walkSubvolumes); err != nil {
return fmt.Errorf("Recursively walking subvolumes for %s failed: %v", dirpath, err)
}
// all subvolumes have been removed
// now remove the one originally passed in
for i, c := range []byte(name) {
args.name[i] = C.char(c)
}
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.BTRFS_IOC_SNAP_DESTROY,
uintptr(unsafe.Pointer(&args)))
if errno != 0 {
return fmt.Errorf("Failed to destroy btrfs snapshot %s for %s: %v", dirpath, name, errno.Error())
}
return nil
}
func subvolEnableQuota(path string) error {
dir, err := openDir(path)
if err != nil {
return err
}
defer closeDir(dir)
var args C.struct_btrfs_ioctl_quota_ctl_args
args.cmd = C.BTRFS_QUOTA_CTL_ENABLE
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.BTRFS_IOC_QUOTA_CTL,
uintptr(unsafe.Pointer(&args)))
if errno != 0 {
return fmt.Errorf("Failed to enable btrfs quota for %s: %v", dir, errno.Error())
}
return nil
}
func subvolDisableQuota(path string) error {
dir, err := openDir(path)
if err != nil {
return err
}
defer closeDir(dir)
var args C.struct_btrfs_ioctl_quota_ctl_args
args.cmd = C.BTRFS_QUOTA_CTL_DISABLE
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.BTRFS_IOC_QUOTA_CTL,
uintptr(unsafe.Pointer(&args)))
if errno != 0 {
return fmt.Errorf("Failed to disable btrfs quota for %s: %v", dir, errno.Error())
}
return nil
}
func subvolRescanQuota(path string) error {
dir, err := openDir(path)
if err != nil {
return err
}
defer closeDir(dir)
var args C.struct_btrfs_ioctl_quota_rescan_args
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.BTRFS_IOC_QUOTA_RESCAN_WAIT,
uintptr(unsafe.Pointer(&args)))
if errno != 0 {
return fmt.Errorf("Failed to rescan btrfs quota for %s: %v", dir, errno.Error())
}
return nil
}
func subvolLimitQgroup(path string, size uint64) error {
dir, err := openDir(path)
if err != nil {
return err
}
defer closeDir(dir)
var args C.struct_btrfs_ioctl_qgroup_limit_args
args.lim.max_referenced = C.__u64(size)
args.lim.flags = C.BTRFS_QGROUP_LIMIT_MAX_RFER
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.BTRFS_IOC_QGROUP_LIMIT,
uintptr(unsafe.Pointer(&args)))
if errno != 0 {
return fmt.Errorf("Failed to limit qgroup for %s: %v", dir, errno.Error())
}
return nil
}
func (d *Driver) subvolumesDir() string {
return path.Join(d.home, "subvolumes")
}
func (d *Driver) subvolumesDirID(id string) string {
return path.Join(d.subvolumesDir(), id)
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
return d.Create(id, parent, mountLabel, storageOpt)
}
// Create the filesystem with given id.
func (d *Driver) Create(id, parent, mountLabel string, storageOpt map[string]string) error {
subvolumes := path.Join(d.home, "subvolumes")
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
return err
}
if err := idtools.MkdirAllAs(subvolumes, 0700, rootUID, rootGID); err != nil {
return err
}
if parent == "" {
if err := subvolCreate(subvolumes, id); err != nil {
return err
}
} else {
parentDir := d.subvolumesDirID(parent)
st, err := os.Stat(parentDir)
if err != nil {
return err
}
if !st.IsDir() {
return fmt.Errorf("%s: not a directory", parentDir)
}
if err := subvolSnapshot(parentDir, subvolumes, id); err != nil {
return err
}
}
if _, ok := storageOpt["size"]; ok {
driver := &Driver{}
if err := d.parseStorageOpt(storageOpt, driver); err != nil {
return err
}
if err := d.setStorageSize(path.Join(subvolumes, id), driver); err != nil {
return err
}
}
// if we have a remapped root (user namespaces enabled), change the created snapshot
// dir ownership to match
if rootUID != 0 || rootGID != 0 {
if err := os.Chown(path.Join(subvolumes, id), rootUID, rootGID); err != nil {
return err
}
}
return label.Relabel(path.Join(subvolumes, id), mountLabel, false)
}
// Parse btrfs storage options
func (d *Driver) parseStorageOpt(storageOpt map[string]string, driver *Driver) error {
// Read size to change the subvolume disk quota per container
for key, val := range storageOpt {
key := strings.ToLower(key)
switch key {
case "size":
size, err := units.RAMInBytes(val)
if err != nil {
return err
}
driver.options.size = uint64(size)
default:
return fmt.Errorf("Unknown option %s", key)
}
}
return nil
}
// Set btrfs storage size
func (d *Driver) setStorageSize(dir string, driver *Driver) error {
if driver.options.size <= 0 {
return fmt.Errorf("btrfs: invalid storage size: %s", units.HumanSize(float64(driver.options.size)))
}
if d.options.minSpace > 0 && driver.options.size < d.options.minSpace {
return fmt.Errorf("btrfs: storage size cannot be less than %s", units.HumanSize(float64(d.options.minSpace)))
}
if !quotaEnabled {
if err := subvolEnableQuota(d.home); err != nil {
return err
}
quotaEnabled = true
}
if err := subvolLimitQgroup(dir, driver.options.size); err != nil {
return err
}
return nil
}
// Remove the filesystem with given id.
func (d *Driver) Remove(id string) error {
dir := d.subvolumesDirID(id)
if _, err := os.Stat(dir); err != nil {
return err
}
if err := subvolDelete(d.subvolumesDir(), id); err != nil {
return err
}
if err := os.RemoveAll(dir); err != nil && !os.IsNotExist(err) {
return err
}
if err := subvolRescanQuota(d.home); err != nil {
return err
}
return nil
}
// Get the requested filesystem id.
func (d *Driver) Get(id, mountLabel string) (string, error) {
dir := d.subvolumesDirID(id)
st, err := os.Stat(dir)
if err != nil {
return "", err
}
if !st.IsDir() {
return "", fmt.Errorf("%s: not a directory", dir)
}
return dir, nil
}
// Put is not implemented for BTRFS as there is no cleanup required for the id.
func (d *Driver) Put(id string) error {
// Get() creates no runtime resources (like e.g. mounts)
// so this doesn't need to do anything.
return nil
}
// Exists checks if the id exists in the filesystem.
func (d *Driver) Exists(id string) bool {
dir := d.subvolumesDirID(id)
_, err := os.Stat(dir)
return err == nil
}

3
vendor/github.com/containers/storage/drivers/btrfs/dummy_unsupported.go generated vendored Normal file
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@ -0,0 +1,3 @@
// +build !linux !cgo
package btrfs

26
vendor/github.com/containers/storage/drivers/btrfs/version.go generated vendored Normal file
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@ -0,0 +1,26 @@
// +build linux,!btrfs_noversion
package btrfs
/*
#include <btrfs/version.h>
// around version 3.16, they did not define lib version yet
#ifndef BTRFS_LIB_VERSION
#define BTRFS_LIB_VERSION -1
#endif
// upstream had removed it, but now it will be coming back
#ifndef BTRFS_BUILD_VERSION
#define BTRFS_BUILD_VERSION "-"
#endif
*/
import "C"
func btrfsBuildVersion() string {
return string(C.BTRFS_BUILD_VERSION)
}
func btrfsLibVersion() int {
return int(C.BTRFS_LIB_VERSION)
}

14
vendor/github.com/containers/storage/drivers/btrfs/version_none.go generated vendored Normal file
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@ -0,0 +1,14 @@
// +build linux,btrfs_noversion
package btrfs
// TODO(vbatts) remove this work-around once supported linux distros are on
// btrfs utilities of >= 3.16.1
func btrfsBuildVersion() string {
return "-"
}
func btrfsLibVersion() int {
return -1
}

67
vendor/github.com/containers/storage/drivers/counter.go generated vendored Normal file
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package graphdriver
import "sync"
type minfo struct {
check bool
count int
}
// RefCounter is a generic counter for use by graphdriver Get/Put calls
type RefCounter struct {
counts map[string]*minfo
mu sync.Mutex
checker Checker
}
// NewRefCounter returns a new RefCounter
func NewRefCounter(c Checker) *RefCounter {
return &RefCounter{
checker: c,
counts: make(map[string]*minfo),
}
}
// Increment increaes the ref count for the given id and returns the current count
func (c *RefCounter) Increment(path string) int {
c.mu.Lock()
m := c.counts[path]
if m == nil {
m = &minfo{}
c.counts[path] = m
}
// if we are checking this path for the first time check to make sure
// if it was already mounted on the system and make sure we have a correct ref
// count if it is mounted as it is in use.
if !m.check {
m.check = true
if c.checker.IsMounted(path) {
m.count++
}
}
m.count++
c.mu.Unlock()
return m.count
}
// Decrement decreases the ref count for the given id and returns the current count
func (c *RefCounter) Decrement(path string) int {
c.mu.Lock()
m := c.counts[path]
if m == nil {
m = &minfo{}
c.counts[path] = m
}
// if we are checking this path for the first time check to make sure
// if it was already mounted on the system and make sure we have a correct ref
// count if it is mounted as it is in use.
if !m.check {
m.check = true
if c.checker.IsMounted(path) {
m.count++
}
}
m.count--
c.mu.Unlock()
return m.count
}

2661
vendor/github.com/containers/storage/drivers/devmapper/deviceset.go generated vendored Normal file
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106
vendor/github.com/containers/storage/drivers/devmapper/devmapper_doc.go generated vendored Normal file
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package devmapper
// Definition of struct dm_task and sub structures (from lvm2)
//
// struct dm_ioctl {
// /*
// * The version number is made up of three parts:
// * major - no backward or forward compatibility,
// * minor - only backwards compatible,
// * patch - both backwards and forwards compatible.
// *
// * All clients of the ioctl interface should fill in the
// * version number of the interface that they were
// * compiled with.
// *
// * All recognized ioctl commands (ie. those that don't
// * return -ENOTTY) fill out this field, even if the
// * command failed.
// */
// uint32_t version[3]; /* in/out */
// uint32_t data_size; /* total size of data passed in
// * including this struct */
// uint32_t data_start; /* offset to start of data
// * relative to start of this struct */
// uint32_t target_count; /* in/out */
// int32_t open_count; /* out */
// uint32_t flags; /* in/out */
// /*
// * event_nr holds either the event number (input and output) or the
// * udev cookie value (input only).
// * The DM_DEV_WAIT ioctl takes an event number as input.
// * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
// * use the field as a cookie to return in the DM_COOKIE
// * variable with the uevents they issue.
// * For output, the ioctls return the event number, not the cookie.
// */
// uint32_t event_nr; /* in/out */
// uint32_t padding;
// uint64_t dev; /* in/out */
// char name[DM_NAME_LEN]; /* device name */
// char uuid[DM_UUID_LEN]; /* unique identifier for
// * the block device */
// char data[7]; /* padding or data */
// };
// struct target {
// uint64_t start;
// uint64_t length;
// char *type;
// char *params;
// struct target *next;
// };
// typedef enum {
// DM_ADD_NODE_ON_RESUME, /* add /dev/mapper node with dmsetup resume */
// DM_ADD_NODE_ON_CREATE /* add /dev/mapper node with dmsetup create */
// } dm_add_node_t;
// struct dm_task {
// int type;
// char *dev_name;
// char *mangled_dev_name;
// struct target *head, *tail;
// int read_only;
// uint32_t event_nr;
// int major;
// int minor;
// int allow_default_major_fallback;
// uid_t uid;
// gid_t gid;
// mode_t mode;
// uint32_t read_ahead;
// uint32_t read_ahead_flags;
// union {
// struct dm_ioctl *v4;
// } dmi;
// char *newname;
// char *message;
// char *geometry;
// uint64_t sector;
// int no_flush;
// int no_open_count;
// int skip_lockfs;
// int query_inactive_table;
// int suppress_identical_reload;
// dm_add_node_t add_node;
// uint64_t existing_table_size;
// int cookie_set;
// int new_uuid;
// int secure_data;
// int retry_remove;
// int enable_checks;
// int expected_errno;
// char *uuid;
// char *mangled_uuid;
// };
//

226
vendor/github.com/containers/storage/drivers/devmapper/driver.go generated vendored Normal file
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@ -0,0 +1,226 @@
// +build linux
package devmapper
import (
"fmt"
"io/ioutil"
"os"
"path"
"strconv"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/drivers"
"github.com/containers/storage/pkg/devicemapper"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/mount"
"github.com/docker/go-units"
)
func init() {
graphdriver.Register("devicemapper", Init)
}
// Driver contains the device set mounted and the home directory
type Driver struct {
*DeviceSet
home string
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
ctr *graphdriver.RefCounter
}
// Init creates a driver with the given home and the set of options.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
deviceSet, err := NewDeviceSet(home, true, options, uidMaps, gidMaps)
if err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
DeviceSet: deviceSet,
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewDefaultChecker()),
}
return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
func (d *Driver) String() string {
return "devicemapper"
}
// Status returns the status about the driver in a printable format.
// Information returned contains Pool Name, Data File, Metadata file, disk usage by
// the data and metadata, etc.
func (d *Driver) Status() [][2]string {
s := d.DeviceSet.Status()
status := [][2]string{
{"Pool Name", s.PoolName},
{"Pool Blocksize", fmt.Sprintf("%s", units.HumanSize(float64(s.SectorSize)))},
{"Base Device Size", fmt.Sprintf("%s", units.HumanSize(float64(s.BaseDeviceSize)))},
{"Backing Filesystem", s.BaseDeviceFS},
{"Data file", s.DataFile},
{"Metadata file", s.MetadataFile},
{"Data Space Used", fmt.Sprintf("%s", units.HumanSize(float64(s.Data.Used)))},
{"Data Space Total", fmt.Sprintf("%s", units.HumanSize(float64(s.Data.Total)))},
{"Data Space Available", fmt.Sprintf("%s", units.HumanSize(float64(s.Data.Available)))},
{"Metadata Space Used", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Used)))},
{"Metadata Space Total", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Total)))},
{"Metadata Space Available", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Available)))},
{"Thin Pool Minimum Free Space", fmt.Sprintf("%s", units.HumanSize(float64(s.MinFreeSpace)))},
{"Udev Sync Supported", fmt.Sprintf("%v", s.UdevSyncSupported)},
{"Deferred Removal Enabled", fmt.Sprintf("%v", s.DeferredRemoveEnabled)},
{"Deferred Deletion Enabled", fmt.Sprintf("%v", s.DeferredDeleteEnabled)},
{"Deferred Deleted Device Count", fmt.Sprintf("%v", s.DeferredDeletedDeviceCount)},
}
if len(s.DataLoopback) > 0 {
status = append(status, [2]string{"Data loop file", s.DataLoopback})
}
if len(s.MetadataLoopback) > 0 {
status = append(status, [2]string{"Metadata loop file", s.MetadataLoopback})
}
if vStr, err := devicemapper.GetLibraryVersion(); err == nil {
status = append(status, [2]string{"Library Version", vStr})
}
return status
}
// GetMetadata returns a map of information about the device.
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
m, err := d.DeviceSet.exportDeviceMetadata(id)
if err != nil {
return nil, err
}
metadata := make(map[string]string)
metadata["DeviceId"] = strconv.Itoa(m.deviceID)
metadata["DeviceSize"] = strconv.FormatUint(m.deviceSize, 10)
metadata["DeviceName"] = m.deviceName
return metadata, nil
}
// Cleanup unmounts a device.
func (d *Driver) Cleanup() error {
err := d.DeviceSet.Shutdown(d.home)
if err2 := mount.Unmount(d.home); err == nil {
err = err2
}
return err
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
return d.Create(id, parent, mountLabel, storageOpt)
}
// Create adds a device with a given id and the parent.
func (d *Driver) Create(id, parent, mountLabel string, storageOpt map[string]string) error {
if err := d.DeviceSet.AddDevice(id, parent, storageOpt); err != nil {
return err
}
return nil
}
// Remove removes a device with a given id, unmounts the filesystem.
func (d *Driver) Remove(id string) error {
if !d.DeviceSet.HasDevice(id) {
// Consider removing a non-existing device a no-op
// This is useful to be able to progress on container removal
// if the underlying device has gone away due to earlier errors
return nil
}
// This assumes the device has been properly Get/Put:ed and thus is unmounted
if err := d.DeviceSet.DeleteDevice(id, false); err != nil {
return err
}
mp := path.Join(d.home, "mnt", id)
if err := os.RemoveAll(mp); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
// Get mounts a device with given id into the root filesystem
func (d *Driver) Get(id, mountLabel string) (string, error) {
mp := path.Join(d.home, "mnt", id)
rootFs := path.Join(mp, "rootfs")
if count := d.ctr.Increment(mp); count > 1 {
return rootFs, nil
}
uid, gid, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
d.ctr.Decrement(mp)
return "", err
}
// Create the target directories if they don't exist
if err := idtools.MkdirAllAs(path.Join(d.home, "mnt"), 0755, uid, gid); err != nil && !os.IsExist(err) {
d.ctr.Decrement(mp)
return "", err
}
if err := idtools.MkdirAs(mp, 0755, uid, gid); err != nil && !os.IsExist(err) {
d.ctr.Decrement(mp)
return "", err
}
// Mount the device
if err := d.DeviceSet.MountDevice(id, mp, mountLabel); err != nil {
d.ctr.Decrement(mp)
return "", err
}
if err := idtools.MkdirAllAs(rootFs, 0755, uid, gid); err != nil && !os.IsExist(err) {
d.ctr.Decrement(mp)
d.DeviceSet.UnmountDevice(id, mp)
return "", err
}
idFile := path.Join(mp, "id")
if _, err := os.Stat(idFile); err != nil && os.IsNotExist(err) {
// Create an "id" file with the container/image id in it to help reconstruct this in case
// of later problems
if err := ioutil.WriteFile(idFile, []byte(id), 0600); err != nil {
d.ctr.Decrement(mp)
d.DeviceSet.UnmountDevice(id, mp)
return "", err
}
}
return rootFs, nil
}
// Put unmounts a device and removes it.
func (d *Driver) Put(id string) error {
mp := path.Join(d.home, "mnt", id)
if count := d.ctr.Decrement(mp); count > 0 {
return nil
}
err := d.DeviceSet.UnmountDevice(id, mp)
if err != nil {
logrus.Errorf("devmapper: Error unmounting device %s: %s", id, err)
}
return err
}
// Exists checks to see if the device exists.
func (d *Driver) Exists(id string) bool {
return d.DeviceSet.HasDevice(id)
}

89
vendor/github.com/containers/storage/drivers/devmapper/mount.go generated vendored Normal file
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// +build linux
package devmapper
import (
"bytes"
"fmt"
"os"
"path/filepath"
"syscall"
)
// FIXME: this is copy-pasted from the aufs driver.
// It should be moved into the core.
// Mounted returns true if a mount point exists.
func Mounted(mountpoint string) (bool, error) {
mntpoint, err := os.Stat(mountpoint)
if err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
parent, err := os.Stat(filepath.Join(mountpoint, ".."))
if err != nil {
return false, err
}
mntpointSt := mntpoint.Sys().(*syscall.Stat_t)
parentSt := parent.Sys().(*syscall.Stat_t)
return mntpointSt.Dev != parentSt.Dev, nil
}
type probeData struct {
fsName string
magic string
offset uint64
}
// ProbeFsType returns the filesystem name for the given device id.
func ProbeFsType(device string) (string, error) {
probes := []probeData{
{"btrfs", "_BHRfS_M", 0x10040},
{"ext4", "\123\357", 0x438},
{"xfs", "XFSB", 0},
}
maxLen := uint64(0)
for _, p := range probes {
l := p.offset + uint64(len(p.magic))
if l > maxLen {
maxLen = l
}
}
file, err := os.Open(device)
if err != nil {
return "", err
}
defer file.Close()
buffer := make([]byte, maxLen)
l, err := file.Read(buffer)
if err != nil {
return "", err
}
if uint64(l) != maxLen {
return "", fmt.Errorf("devmapper: unable to detect filesystem type of %s, short read", device)
}
for _, p := range probes {
if bytes.Equal([]byte(p.magic), buffer[p.offset:p.offset+uint64(len(p.magic))]) {
return p.fsName, nil
}
}
return "", fmt.Errorf("devmapper: Unknown filesystem type on %s", device)
}
func joinMountOptions(a, b string) string {
if a == "" {
return b
}
if b == "" {
return a
}
return a + "," + b
}

243
vendor/github.com/containers/storage/drivers/driver.go generated vendored Normal file
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package graphdriver
import (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/Sirupsen/logrus"
"github.com/vbatts/tar-split/tar/storage"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/idtools"
)
// FsMagic unsigned id of the filesystem in use.
type FsMagic uint32
const (
// FsMagicUnsupported is a predefined constant value other than a valid filesystem id.
FsMagicUnsupported = FsMagic(0x00000000)
)
var (
// All registered drivers
drivers map[string]InitFunc
// ErrNotSupported returned when driver is not supported.
ErrNotSupported = errors.New("driver not supported")
// ErrPrerequisites retuned when driver does not meet prerequisites.
ErrPrerequisites = errors.New("prerequisites for driver not satisfied (wrong filesystem?)")
// ErrIncompatibleFS returned when file system is not supported.
ErrIncompatibleFS = fmt.Errorf("backing file system is unsupported for this graph driver")
)
// InitFunc initializes the storage driver.
type InitFunc func(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error)
// ProtoDriver defines the basic capabilities of a driver.
// This interface exists solely to be a minimum set of methods
// for client code which choose not to implement the entire Driver
// interface and use the NaiveDiffDriver wrapper constructor.
//
// Use of ProtoDriver directly by client code is not recommended.
type ProtoDriver interface {
// String returns a string representation of this driver.
String() string
// CreateReadWrite creates a new, empty filesystem layer that is ready
// to be used as the storage for a container.
CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error
// Create creates a new, empty, filesystem layer with the
// specified id and parent and mountLabel. Parent and mountLabel may be "".
Create(id, parent, mountLabel string, storageOpt map[string]string) error
// Remove attempts to remove the filesystem layer with this id.
Remove(id string) error
// Get returns the mountpoint for the layered filesystem referred
// to by this id. You can optionally specify a mountLabel or "".
// Returns the absolute path to the mounted layered filesystem.
Get(id, mountLabel string) (dir string, err error)
// Put releases the system resources for the specified id,
// e.g, unmounting layered filesystem.
Put(id string) error
// Exists returns whether a filesystem layer with the specified
// ID exists on this driver.
Exists(id string) bool
// Status returns a set of key-value pairs which give low
// level diagnostic status about this driver.
Status() [][2]string
// Returns a set of key-value pairs which give low level information
// about the image/container driver is managing.
GetMetadata(id string) (map[string]string, error)
// Cleanup performs necessary tasks to release resources
// held by the driver, e.g., unmounting all layered filesystems
// known to this driver.
Cleanup() error
}
// Driver is the interface for layered/snapshot file system drivers.
type Driver interface {
ProtoDriver
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
Diff(id, parent string) (archive.Archive, error)
// Changes produces a list of changes between the specified layer
// and its parent layer. If parent is "", then all changes will be ADD changes.
Changes(id, parent string) ([]archive.Change, error)
// ApplyDiff extracts the changeset from the given diff into the
// layer with the specified id and parent, returning the size of the
// new layer in bytes.
// The archive.Reader must be an uncompressed stream.
ApplyDiff(id, parent string, diff archive.Reader) (size int64, err error)
// DiffSize calculates the changes between the specified id
// and its parent and returns the size in bytes of the changes
// relative to its base filesystem directory.
DiffSize(id, parent string) (size int64, err error)
}
// DiffGetterDriver is the interface for layered file system drivers that
// provide a specialized function for getting file contents for tar-split.
type DiffGetterDriver interface {
Driver
// DiffGetter returns an interface to efficiently retrieve the contents
// of files in a layer.
DiffGetter(id string) (FileGetCloser, error)
}
// FileGetCloser extends the storage.FileGetter interface with a Close method
// for cleaning up.
type FileGetCloser interface {
storage.FileGetter
// Close cleans up any resources associated with the FileGetCloser.
Close() error
}
// Checker makes checks on specified filesystems.
type Checker interface {
// IsMounted returns true if the provided path is mounted for the specific checker
IsMounted(path string) bool
}
func init() {
drivers = make(map[string]InitFunc)
}
// Register registers an InitFunc for the driver.
func Register(name string, initFunc InitFunc) error {
if _, exists := drivers[name]; exists {
return fmt.Errorf("Name already registered %s", name)
}
drivers[name] = initFunc
return nil
}
// GetDriver initializes and returns the registered driver
func GetDriver(name, home string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error) {
if initFunc, exists := drivers[name]; exists {
return initFunc(filepath.Join(home, name), options, uidMaps, gidMaps)
}
if pluginDriver, err := lookupPlugin(name, home, options); err == nil {
return pluginDriver, nil
}
logrus.Errorf("Failed to GetDriver graph %s %s", name, home)
return nil, ErrNotSupported
}
// getBuiltinDriver initializes and returns the registered driver, but does not try to load from plugins
func getBuiltinDriver(name, home string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error) {
if initFunc, exists := drivers[name]; exists {
return initFunc(filepath.Join(home, name), options, uidMaps, gidMaps)
}
logrus.Errorf("Failed to built-in GetDriver graph %s %s", name, home)
return nil, ErrNotSupported
}
// New creates the driver and initializes it at the specified root.
func New(root string, name string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error) {
if name != "" {
logrus.Debugf("[graphdriver] trying provided driver %q", name) // so the logs show specified driver
return GetDriver(name, root, options, uidMaps, gidMaps)
}
// Guess for prior driver
driversMap := scanPriorDrivers(root)
for _, name := range priority {
if name == "vfs" {
// don't use vfs even if there is state present.
continue
}
if _, prior := driversMap[name]; prior {
// of the state found from prior drivers, check in order of our priority
// which we would prefer
driver, err := getBuiltinDriver(name, root, options, uidMaps, gidMaps)
if err != nil {
// unlike below, we will return error here, because there is prior
// state, and now it is no longer supported/prereq/compatible, so
// something changed and needs attention. Otherwise the daemon's
// images would just "disappear".
logrus.Errorf("[graphdriver] prior storage driver %q failed: %s", name, err)
return nil, err
}
// abort starting when there are other prior configured drivers
// to ensure the user explicitly selects the driver to load
if len(driversMap)-1 > 0 {
var driversSlice []string
for name := range driversMap {
driversSlice = append(driversSlice, name)
}
return nil, fmt.Errorf("%q contains several valid graphdrivers: %s; Please cleanup or explicitly choose storage driver (-s <DRIVER>)", root, strings.Join(driversSlice, ", "))
}
logrus.Infof("[graphdriver] using prior storage driver %q", name)
return driver, nil
}
}
// Check for priority drivers first
for _, name := range priority {
driver, err := getBuiltinDriver(name, root, options, uidMaps, gidMaps)
if err != nil {
if isDriverNotSupported(err) {
continue
}
return nil, err
}
return driver, nil
}
// Check all registered drivers if no priority driver is found
for name, initFunc := range drivers {
driver, err := initFunc(filepath.Join(root, name), options, uidMaps, gidMaps)
if err != nil {
if isDriverNotSupported(err) {
continue
}
return nil, err
}
return driver, nil
}
return nil, fmt.Errorf("No supported storage backend found")
}
// isDriverNotSupported returns true if the error initializing
// the graph driver is a non-supported error.
func isDriverNotSupported(err error) bool {
return err == ErrNotSupported || err == ErrPrerequisites || err == ErrIncompatibleFS
}
// scanPriorDrivers returns an un-ordered scan of directories of prior storage drivers
func scanPriorDrivers(root string) map[string]bool {
driversMap := make(map[string]bool)
for driver := range drivers {
p := filepath.Join(root, driver)
if _, err := os.Stat(p); err == nil && driver != "vfs" {
driversMap[driver] = true
}
}
return driversMap
}

19
vendor/github.com/containers/storage/drivers/driver_freebsd.go generated vendored Normal file
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package graphdriver
import "syscall"
var (
// Slice of drivers that should be used in an order
priority = []string{
"zfs",
}
)
// Mounted checks if the given path is mounted as the fs type
func Mounted(fsType FsMagic, mountPath string) (bool, error) {
var buf syscall.Statfs_t
if err := syscall.Statfs(mountPath, &buf); err != nil {
return false, err
}
return FsMagic(buf.Type) == fsType, nil
}

133
vendor/github.com/containers/storage/drivers/driver_linux.go generated vendored Normal file
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// +build linux
package graphdriver
import (
"path/filepath"
"syscall"
"github.com/containers/storage/pkg/mount"
)
const (
// FsMagicAufs filesystem id for Aufs
FsMagicAufs = FsMagic(0x61756673)
// FsMagicBtrfs filesystem id for Btrfs
FsMagicBtrfs = FsMagic(0x9123683E)
// FsMagicCramfs filesystem id for Cramfs
FsMagicCramfs = FsMagic(0x28cd3d45)
// FsMagicEcryptfs filesystem id for eCryptfs
FsMagicEcryptfs = FsMagic(0xf15f)
// FsMagicExtfs filesystem id for Extfs
FsMagicExtfs = FsMagic(0x0000EF53)
// FsMagicF2fs filesystem id for F2fs
FsMagicF2fs = FsMagic(0xF2F52010)
// FsMagicGPFS filesystem id for GPFS
FsMagicGPFS = FsMagic(0x47504653)
// FsMagicJffs2Fs filesystem if for Jffs2Fs
FsMagicJffs2Fs = FsMagic(0x000072b6)
// FsMagicJfs filesystem id for Jfs
FsMagicJfs = FsMagic(0x3153464a)
// FsMagicNfsFs filesystem id for NfsFs
FsMagicNfsFs = FsMagic(0x00006969)
// FsMagicRAMFs filesystem id for RamFs
FsMagicRAMFs = FsMagic(0x858458f6)
// FsMagicReiserFs filesystem id for ReiserFs
FsMagicReiserFs = FsMagic(0x52654973)
// FsMagicSmbFs filesystem id for SmbFs
FsMagicSmbFs = FsMagic(0x0000517B)
// FsMagicSquashFs filesystem id for SquashFs
FsMagicSquashFs = FsMagic(0x73717368)
// FsMagicTmpFs filesystem id for TmpFs
FsMagicTmpFs = FsMagic(0x01021994)
// FsMagicVxFS filesystem id for VxFs
FsMagicVxFS = FsMagic(0xa501fcf5)
// FsMagicXfs filesystem id for Xfs
FsMagicXfs = FsMagic(0x58465342)
// FsMagicZfs filesystem id for Zfs
FsMagicZfs = FsMagic(0x2fc12fc1)
// FsMagicOverlay filesystem id for overlay
FsMagicOverlay = FsMagic(0x794C7630)
)
var (
// Slice of drivers that should be used in an order
priority = []string{
"aufs",
"btrfs",
"zfs",
"devicemapper",
"overlay",
"vfs",
}
// FsNames maps filesystem id to name of the filesystem.
FsNames = map[FsMagic]string{
FsMagicAufs: "aufs",
FsMagicBtrfs: "btrfs",
FsMagicCramfs: "cramfs",
FsMagicExtfs: "extfs",
FsMagicF2fs: "f2fs",
FsMagicGPFS: "gpfs",
FsMagicJffs2Fs: "jffs2",
FsMagicJfs: "jfs",
FsMagicNfsFs: "nfs",
FsMagicRAMFs: "ramfs",
FsMagicReiserFs: "reiserfs",
FsMagicSmbFs: "smb",
FsMagicSquashFs: "squashfs",
FsMagicTmpFs: "tmpfs",
FsMagicUnsupported: "unsupported",
FsMagicVxFS: "vxfs",
FsMagicXfs: "xfs",
FsMagicZfs: "zfs",
}
)
// GetFSMagic returns the filesystem id given the path.
func GetFSMagic(rootpath string) (FsMagic, error) {
var buf syscall.Statfs_t
if err := syscall.Statfs(filepath.Dir(rootpath), &buf); err != nil {
return 0, err
}
return FsMagic(buf.Type), nil
}
// NewFsChecker returns a checker configured for the provied FsMagic
func NewFsChecker(t FsMagic) Checker {
return &fsChecker{
t: t,
}
}
type fsChecker struct {
t FsMagic
}
func (c *fsChecker) IsMounted(path string) bool {
m, _ := Mounted(c.t, path)
return m
}
// NewDefaultChecker returns a check that parses /proc/mountinfo to check
// if the specified path is mounted.
func NewDefaultChecker() Checker {
return &defaultChecker{}
}
type defaultChecker struct {
}
func (c *defaultChecker) IsMounted(path string) bool {
m, _ := mount.Mounted(path)
return m
}
// Mounted checks if the given path is mounted as the fs type
func Mounted(fsType FsMagic, mountPath string) (bool, error) {
var buf syscall.Statfs_t
if err := syscall.Statfs(mountPath, &buf); err != nil {
return false, err
}
return FsMagic(buf.Type) == fsType, nil
}

65
vendor/github.com/containers/storage/drivers/driver_solaris.go generated vendored Normal file
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// +build solaris,cgo
package graphdriver
/*
#include <sys/statvfs.h>
#include <stdlib.h>
static inline struct statvfs *getstatfs(char *s) {
struct statvfs *buf;
int err;
buf = (struct statvfs *)malloc(sizeof(struct statvfs));
err = statvfs(s, buf);
return buf;
}
*/
import "C"
import (
"path/filepath"
"unsafe"
log "github.com/Sirupsen/logrus"
)
const (
// FsMagicZfs filesystem id for Zfs
FsMagicZfs = FsMagic(0x2fc12fc1)
)
var (
// Slice of drivers that should be used in an order
priority = []string{
"zfs",
}
// FsNames maps filesystem id to name of the filesystem.
FsNames = map[FsMagic]string{
FsMagicZfs: "zfs",
}
)
// GetFSMagic returns the filesystem id given the path.
func GetFSMagic(rootpath string) (FsMagic, error) {
return 0, nil
}
// Mounted checks if the given path is mounted as the fs type
//Solaris supports only ZFS for now
func Mounted(fsType FsMagic, mountPath string) (bool, error) {
cs := C.CString(filepath.Dir(mountPath))
buf := C.getstatfs(cs)
// on Solaris buf.f_basetype contains ['z', 'f', 's', 0 ... ]
if (buf.f_basetype[0] != 122) || (buf.f_basetype[1] != 102) || (buf.f_basetype[2] != 115) ||
(buf.f_basetype[3] != 0) {
log.Debugf("[zfs] no zfs dataset found for rootdir '%s'", mountPath)
C.free(unsafe.Pointer(buf))
return false, ErrPrerequisites
}
C.free(unsafe.Pointer(buf))
C.free(unsafe.Pointer(cs))
return true, nil
}

15
vendor/github.com/containers/storage/drivers/driver_unsupported.go generated vendored Normal file
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// +build !linux,!windows,!freebsd,!solaris
package graphdriver
var (
// Slice of drivers that should be used in an order
priority = []string{
"unsupported",
}
)
// GetFSMagic returns the filesystem id given the path.
func GetFSMagic(rootpath string) (FsMagic, error) {
return FsMagicUnsupported, nil
}

14
vendor/github.com/containers/storage/drivers/driver_windows.go generated vendored Normal file
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@ -0,0 +1,14 @@
package graphdriver
var (
// Slice of drivers that should be used in order
priority = []string{
"windowsfilter",
}
)
// GetFSMagic returns the filesystem id given the path.
func GetFSMagic(rootpath string) (FsMagic, error) {
// Note it is OK to return FsMagicUnsupported on Windows.
return FsMagicUnsupported, nil
}

157
vendor/github.com/containers/storage/drivers/fsdiff.go generated vendored Normal file
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package graphdriver
import (
"time"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/ioutils"
)
var (
// ApplyUncompressedLayer defines the unpack method used by the graph
// driver.
ApplyUncompressedLayer = chrootarchive.ApplyUncompressedLayer
)
// NaiveDiffDriver takes a ProtoDriver and adds the
// capability of the Diffing methods which it may or may not
// support on its own. See the comment on the exported
// NewNaiveDiffDriver function below.
// Notably, the AUFS driver doesn't need to be wrapped like this.
type NaiveDiffDriver struct {
ProtoDriver
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
}
// NewNaiveDiffDriver returns a fully functional driver that wraps the
// given ProtoDriver and adds the capability of the following methods which
// it may or may not support on its own:
// Diff(id, parent string) (archive.Archive, error)
// Changes(id, parent string) ([]archive.Change, error)
// ApplyDiff(id, parent string, diff archive.Reader) (size int64, err error)
// DiffSize(id, parent string) (size int64, err error)
func NewNaiveDiffDriver(driver ProtoDriver, uidMaps, gidMaps []idtools.IDMap) Driver {
gdw := &NaiveDiffDriver{
ProtoDriver: driver,
uidMaps: uidMaps,
gidMaps: gidMaps,
}
return gdw
}
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (gdw *NaiveDiffDriver) Diff(id, parent string) (arch archive.Archive, err error) {
layerFs, err := gdw.Get(id, "")
if err != nil {
return nil, err
}
defer func() {
if err != nil {
gdw.Put(id)
}
}()
if parent == "" {
archive, err := archive.Tar(layerFs, archive.Uncompressed)
if err != nil {
return nil, err
}
return ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
gdw.Put(id)
return err
}), nil
}
parentFs, err := gdw.Get(parent, "")
if err != nil {
return nil, err
}
defer gdw.Put(parent)
changes, err := archive.ChangesDirs(layerFs, parentFs)
if err != nil {
return nil, err
}
archive, err := archive.ExportChanges(layerFs, changes, gdw.uidMaps, gdw.gidMaps)
if err != nil {
return nil, err
}
return ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
gdw.Put(id)
return err
}), nil
}
// Changes produces a list of changes between the specified layer
// and its parent layer. If parent is "", then all changes will be ADD changes.
func (gdw *NaiveDiffDriver) Changes(id, parent string) ([]archive.Change, error) {
layerFs, err := gdw.Get(id, "")
if err != nil {
return nil, err
}
defer gdw.Put(id)
parentFs := ""
if parent != "" {
parentFs, err = gdw.Get(parent, "")
if err != nil {
return nil, err
}
defer gdw.Put(parent)
}
return archive.ChangesDirs(layerFs, parentFs)
}
// ApplyDiff extracts the changeset from the given diff into the
// layer with the specified id and parent, returning the size of the
// new layer in bytes.
func (gdw *NaiveDiffDriver) ApplyDiff(id, parent string, diff archive.Reader) (size int64, err error) {
// Mount the root filesystem so we can apply the diff/layer.
layerFs, err := gdw.Get(id, "")
if err != nil {
return
}
defer gdw.Put(id)
options := &archive.TarOptions{UIDMaps: gdw.uidMaps,
GIDMaps: gdw.gidMaps}
start := time.Now().UTC()
logrus.Debug("Start untar layer")
if size, err = ApplyUncompressedLayer(layerFs, diff, options); err != nil {
return
}
logrus.Debugf("Untar time: %vs", time.Now().UTC().Sub(start).Seconds())
return
}
// DiffSize calculates the changes between the specified layer
// and its parent and returns the size in bytes of the changes
// relative to its base filesystem directory.
func (gdw *NaiveDiffDriver) DiffSize(id, parent string) (size int64, err error) {
changes, err := gdw.Changes(id, parent)
if err != nil {
return
}
layerFs, err := gdw.Get(id, "")
if err != nil {
return
}
defer gdw.Put(id)
return archive.ChangesSize(layerFs, changes), nil
}

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vendor/github.com/containers/storage/drivers/overlay/copy.go generated vendored Normal file
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// +build linux
package overlay
import (
"fmt"
"os"
"path/filepath"
"syscall"
"time"
"github.com/containers/storage/pkg/pools"
"github.com/containers/storage/pkg/system"
)
type copyFlags int
const (
copyHardlink copyFlags = 1 << iota
)
func copyRegular(srcPath, dstPath string, mode os.FileMode) error {
srcFile, err := os.Open(srcPath)
if err != nil {
return err
}
defer srcFile.Close()
dstFile, err := os.OpenFile(dstPath, os.O_WRONLY|os.O_CREATE, mode)
if err != nil {
return err
}
defer dstFile.Close()
_, err = pools.Copy(dstFile, srcFile)
return err
}
func copyXattr(srcPath, dstPath, attr string) error {
data, err := system.Lgetxattr(srcPath, attr)
if err != nil {
return err
}
if data != nil {
if err := system.Lsetxattr(dstPath, attr, data, 0); err != nil {
return err
}
}
return nil
}
func copyDir(srcDir, dstDir string, flags copyFlags) error {
err := filepath.Walk(srcDir, func(srcPath string, f os.FileInfo, err error) error {
if err != nil {
return err
}
// Rebase path
relPath, err := filepath.Rel(srcDir, srcPath)
if err != nil {
return err
}
dstPath := filepath.Join(dstDir, relPath)
if err != nil {
return err
}
stat, ok := f.Sys().(*syscall.Stat_t)
if !ok {
return fmt.Errorf("Unable to get raw syscall.Stat_t data for %s", srcPath)
}
isHardlink := false
switch f.Mode() & os.ModeType {
case 0: // Regular file
if flags&copyHardlink != 0 {
isHardlink = true
if err := os.Link(srcPath, dstPath); err != nil {
return err
}
} else {
if err := copyRegular(srcPath, dstPath, f.Mode()); err != nil {
return err
}
}
case os.ModeDir:
if err := os.Mkdir(dstPath, f.Mode()); err != nil && !os.IsExist(err) {
return err
}
case os.ModeSymlink:
link, err := os.Readlink(srcPath)
if err != nil {
return err
}
if err := os.Symlink(link, dstPath); err != nil {
return err
}
case os.ModeNamedPipe:
fallthrough
case os.ModeSocket:
if err := syscall.Mkfifo(dstPath, stat.Mode); err != nil {
return err
}
case os.ModeDevice:
if err := syscall.Mknod(dstPath, stat.Mode, int(stat.Rdev)); err != nil {
return err
}
default:
return fmt.Errorf("Unknown file type for %s\n", srcPath)
}
// Everything below is copying metadata from src to dst. All this metadata
// already shares an inode for hardlinks.
if isHardlink {
return nil
}
if err := os.Lchown(dstPath, int(stat.Uid), int(stat.Gid)); err != nil {
return err
}
if err := copyXattr(srcPath, dstPath, "security.capability"); err != nil {
return err
}
// We need to copy this attribute if it appears in an overlay upper layer, as
// this function is used to copy those. It is set by overlay if a directory
// is removed and then re-created and should not inherit anything from the
// same dir in the lower dir.
if err := copyXattr(srcPath, dstPath, "trusted.overlay.opaque"); err != nil {
return err
}
isSymlink := f.Mode()&os.ModeSymlink != 0
// There is no LChmod, so ignore mode for symlink. Also, this
// must happen after chown, as that can modify the file mode
if !isSymlink {
if err := os.Chmod(dstPath, f.Mode()); err != nil {
return err
}
}
// system.Chtimes doesn't support a NOFOLLOW flag atm
if !isSymlink {
aTime := time.Unix(int64(stat.Atim.Sec), int64(stat.Atim.Nsec))
mTime := time.Unix(int64(stat.Mtim.Sec), int64(stat.Mtim.Nsec))
if err := system.Chtimes(dstPath, aTime, mTime); err != nil {
return err
}
} else {
ts := []syscall.Timespec{stat.Atim, stat.Mtim}
if err := system.LUtimesNano(dstPath, ts); err != nil {
return err
}
}
return nil
})
return err
}

450
vendor/github.com/containers/storage/drivers/overlay/overlay.go generated vendored Normal file
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// +build linux
package overlay
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/drivers"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/mount"
"github.com/opencontainers/runc/libcontainer/label"
)
// This is a small wrapper over the NaiveDiffWriter that lets us have a custom
// implementation of ApplyDiff()
var (
// ErrApplyDiffFallback is returned to indicate that a normal ApplyDiff is applied as a fallback from Naive diff writer.
ErrApplyDiffFallback = fmt.Errorf("Fall back to normal ApplyDiff")
backingFs = "<unknown>"
)
// ApplyDiffProtoDriver wraps the ProtoDriver by extending the interface with ApplyDiff method.
type ApplyDiffProtoDriver interface {
graphdriver.ProtoDriver
// ApplyDiff writes the diff to the archive for the given id and parent id.
// It returns the size in bytes written if successful, an error ErrApplyDiffFallback is returned otherwise.
ApplyDiff(id, parent string, diff archive.Reader) (size int64, err error)
}
type naiveDiffDriverWithApply struct {
graphdriver.Driver
applyDiff ApplyDiffProtoDriver
}
// NaiveDiffDriverWithApply returns a NaiveDiff driver with custom ApplyDiff.
func NaiveDiffDriverWithApply(driver ApplyDiffProtoDriver, uidMaps, gidMaps []idtools.IDMap) graphdriver.Driver {
return &naiveDiffDriverWithApply{
Driver: graphdriver.NewNaiveDiffDriver(driver, uidMaps, gidMaps),
applyDiff: driver,
}
}
// ApplyDiff creates a diff layer with either the NaiveDiffDriver or with a fallback.
func (d *naiveDiffDriverWithApply) ApplyDiff(id, parent string, diff archive.Reader) (int64, error) {
b, err := d.applyDiff.ApplyDiff(id, parent, diff)
if err == ErrApplyDiffFallback {
return d.Driver.ApplyDiff(id, parent, diff)
}
return b, err
}
// This backend uses the overlay union filesystem for containers
// plus hard link file sharing for images.
// Each container/image can have a "root" subdirectory which is a plain
// filesystem hierarchy, or they can use overlay.
// If they use overlay there is a "upper" directory and a "lower-id"
// file, as well as "merged" and "work" directories. The "upper"
// directory has the upper layer of the overlay, and "lower-id" contains
// the id of the parent whose "root" directory shall be used as the lower
// layer in the overlay. The overlay itself is mounted in the "merged"
// directory, and the "work" dir is needed for overlay to work.
// When an overlay layer is created there are two cases, either the
// parent has a "root" dir, then we start out with an empty "upper"
// directory overlaid on the parents root. This is typically the
// case with the init layer of a container which is based on an image.
// If there is no "root" in the parent, we inherit the lower-id from
// the parent and start by making a copy in the parent's "upper" dir.
// This is typically the case for a container layer which copies
// its parent -init upper layer.
// Additionally we also have a custom implementation of ApplyLayer
// which makes a recursive copy of the parent "root" layer using
// hardlinks to share file data, and then applies the layer on top
// of that. This means all child images share file (but not directory)
// data with the parent.
// Driver contains information about the home directory and the list of active mounts that are created using this driver.
type Driver struct {
home string
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
ctr *graphdriver.RefCounter
}
func init() {
graphdriver.Register("overlay", Init)
}
// Init returns the NaiveDiffDriver, a native diff driver for overlay filesystem.
// If overlay filesystem is not supported on the host, graphdriver.ErrNotSupported is returned as error.
// If an overlay filesystem is not supported over an existing filesystem then error graphdriver.ErrIncompatibleFS is returned.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
if err := supportsOverlay(); err != nil {
return nil, graphdriver.ErrNotSupported
}
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
switch fsMagic {
case graphdriver.FsMagicAufs, graphdriver.FsMagicBtrfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicZfs, graphdriver.FsMagicEcryptfs:
logrus.Errorf("'overlay' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the driver home dir
if err := idtools.MkdirAllAs(home, 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewFsChecker(graphdriver.FsMagicOverlay)),
}
return NaiveDiffDriverWithApply(d, uidMaps, gidMaps), nil
}
func supportsOverlay() error {
// We can try to modprobe overlay first before looking at
// proc/filesystems for when overlay is supported
exec.Command("modprobe", "overlay").Run()
f, err := os.Open("/proc/filesystems")
if err != nil {
return err
}
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
if s.Text() == "nodev\toverlay" {
return nil
}
}
logrus.Error("'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.")
return graphdriver.ErrNotSupported
}
func (d *Driver) String() string {
return "overlay"
}
// Status returns current driver information in a two dimensional string array.
// Output contains "Backing Filesystem" used in this implementation.
func (d *Driver) Status() [][2]string {
return [][2]string{
{"Backing Filesystem", backingFs},
}
}
// GetMetadata returns meta data about the overlay driver such as root, LowerDir, UpperDir, WorkDir and MergeDir used to store data.
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
dir := d.dir(id)
if _, err := os.Stat(dir); err != nil {
return nil, err
}
metadata := make(map[string]string)
// If id has a root, it is an image
rootDir := path.Join(dir, "root")
if _, err := os.Stat(rootDir); err == nil {
metadata["RootDir"] = rootDir
return metadata, nil
}
lowerID, err := ioutil.ReadFile(path.Join(dir, "lower-id"))
if err != nil {
return nil, err
}
metadata["LowerDir"] = path.Join(d.dir(string(lowerID)), "root")
metadata["UpperDir"] = path.Join(dir, "upper")
metadata["WorkDir"] = path.Join(dir, "work")
metadata["MergedDir"] = path.Join(dir, "merged")
return metadata, nil
}
// Cleanup any state created by overlay which should be cleaned when daemon
// is being shutdown. For now, we just have to unmount the bind mounted
// we had created.
func (d *Driver) Cleanup() error {
return mount.Unmount(d.home)
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
return d.Create(id, parent, mountLabel, storageOpt)
}
// Create is used to create the upper, lower, and merge directories required for overlay fs for a given id.
// The parent filesystem is used to configure these directories for the overlay.
func (d *Driver) Create(id, parent, mountLabel string, storageOpt map[string]string) (retErr error) {
if len(storageOpt) != 0 {
return fmt.Errorf("--storage-opt is not supported for overlay")
}
dir := d.dir(id)
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
return err
}
if err := idtools.MkdirAllAs(path.Dir(dir), 0700, rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(dir, 0700, rootUID, rootGID); err != nil {
return err
}
defer func() {
// Clean up on failure
if retErr != nil {
os.RemoveAll(dir)
}
}()
// Toplevel images are just a "root" dir
if parent == "" {
if err := idtools.MkdirAs(path.Join(dir, "root"), 0755, rootUID, rootGID); err != nil {
return err
}
return nil
}
parentDir := d.dir(parent)
// Ensure parent exists
if _, err := os.Lstat(parentDir); err != nil {
return err
}
// If parent has a root, just do an overlay to it
parentRoot := path.Join(parentDir, "root")
if s, err := os.Lstat(parentRoot); err == nil {
if err := idtools.MkdirAs(path.Join(dir, "upper"), s.Mode(), rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(path.Join(dir, "work"), 0700, rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(path.Join(dir, "merged"), 0700, rootUID, rootGID); err != nil {
return err
}
if err := ioutil.WriteFile(path.Join(dir, "lower-id"), []byte(parent), 0666); err != nil {
return err
}
return nil
}
// Otherwise, copy the upper and the lower-id from the parent
lowerID, err := ioutil.ReadFile(path.Join(parentDir, "lower-id"))
if err != nil {
return err
}
if err := ioutil.WriteFile(path.Join(dir, "lower-id"), lowerID, 0666); err != nil {
return err
}
parentUpperDir := path.Join(parentDir, "upper")
s, err := os.Lstat(parentUpperDir)
if err != nil {
return err
}
upperDir := path.Join(dir, "upper")
if err := idtools.MkdirAs(upperDir, s.Mode(), rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(path.Join(dir, "work"), 0700, rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(path.Join(dir, "merged"), 0700, rootUID, rootGID); err != nil {
return err
}
return copyDir(parentUpperDir, upperDir, 0)
}
func (d *Driver) dir(id string) string {
return path.Join(d.home, id)
}
// Remove cleans the directories that are created for this id.
func (d *Driver) Remove(id string) error {
if err := os.RemoveAll(d.dir(id)); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
// Get creates and mounts the required file system for the given id and returns the mount path.
func (d *Driver) Get(id string, mountLabel string) (s string, err error) {
dir := d.dir(id)
if _, err := os.Stat(dir); err != nil {
return "", err
}
// If id has a root, just return it
rootDir := path.Join(dir, "root")
if _, err := os.Stat(rootDir); err == nil {
return rootDir, nil
}
mergedDir := path.Join(dir, "merged")
if count := d.ctr.Increment(mergedDir); count > 1 {
return mergedDir, nil
}
defer func() {
if err != nil {
if c := d.ctr.Decrement(mergedDir); c <= 0 {
syscall.Unmount(mergedDir, 0)
}
}
}()
lowerID, err := ioutil.ReadFile(path.Join(dir, "lower-id"))
if err != nil {
return "", err
}
var (
lowerDir = path.Join(d.dir(string(lowerID)), "root")
upperDir = path.Join(dir, "upper")
workDir = path.Join(dir, "work")
opts = fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", lowerDir, upperDir, workDir)
)
if err := syscall.Mount("overlay", mergedDir, "overlay", 0, label.FormatMountLabel(opts, mountLabel)); err != nil {
return "", fmt.Errorf("error creating overlay mount to %s: %v", mergedDir, err)
}
// chown "workdir/work" to the remapped root UID/GID. Overlay fs inside a
// user namespace requires this to move a directory from lower to upper.
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
return "", err
}
if err := os.Chown(path.Join(workDir, "work"), rootUID, rootGID); err != nil {
return "", err
}
return mergedDir, nil
}
// Put unmounts the mount path created for the give id.
func (d *Driver) Put(id string) error {
mountpoint := path.Join(d.dir(id), "merged")
if count := d.ctr.Decrement(mountpoint); count > 0 {
return nil
}
err := syscall.Unmount(mountpoint, 0)
if err != nil {
rootDir := path.Join(d.dir(id), "root")
if _, err := os.Stat(rootDir); err == nil {
// We weren't mounting a "merged" directory anyway
return nil
}
logrus.Debugf("Failed to unmount %s overlay: %v", id, err)
}
return err
}
// ApplyDiff applies the new layer on top of the root, if parent does not exist with will return an ErrApplyDiffFallback error.
func (d *Driver) ApplyDiff(id string, parent string, diff archive.Reader) (size int64, err error) {
dir := d.dir(id)
if parent == "" {
return 0, ErrApplyDiffFallback
}
parentRootDir := path.Join(d.dir(parent), "root")
if _, err := os.Stat(parentRootDir); err != nil {
return 0, ErrApplyDiffFallback
}
// We now know there is a parent, and it has a "root" directory containing
// the full root filesystem. We can just hardlink it and apply the
// layer. This relies on two things:
// 1) ApplyDiff is only run once on a clean (no writes to upper layer) container
// 2) ApplyDiff doesn't do any in-place writes to files (would break hardlinks)
// These are all currently true and are not expected to break
tmpRootDir, err := ioutil.TempDir(dir, "tmproot")
if err != nil {
return 0, err
}
defer func() {
if err != nil {
os.RemoveAll(tmpRootDir)
} else {
os.RemoveAll(path.Join(dir, "upper"))
os.RemoveAll(path.Join(dir, "work"))
os.RemoveAll(path.Join(dir, "merged"))
os.RemoveAll(path.Join(dir, "lower-id"))
}
}()
if err = copyDir(parentRootDir, tmpRootDir, copyHardlink); err != nil {
return 0, err
}
options := &archive.TarOptions{UIDMaps: d.uidMaps, GIDMaps: d.gidMaps}
if size, err = graphdriver.ApplyUncompressedLayer(tmpRootDir, diff, options); err != nil {
return 0, err
}
rootDir := path.Join(dir, "root")
if err := os.Rename(tmpRootDir, rootDir); err != nil {
return 0, err
}
return
}
// Exists checks to see if the id is already mounted.
func (d *Driver) Exists(id string) bool {
_, err := os.Stat(d.dir(id))
return err == nil
}

3
vendor/github.com/containers/storage/drivers/overlay/overlay_unsupported.go generated vendored Normal file
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// +build !linux
package overlay

88
vendor/github.com/containers/storage/drivers/overlay2/mount.go generated vendored Normal file
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// +build linux
package overlay2
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"os"
"runtime"
"syscall"
"github.com/containers/storage/pkg/reexec"
)
func init() {
reexec.Register("docker-mountfrom", mountFromMain)
}
func fatal(err error) {
fmt.Fprint(os.Stderr, err)
os.Exit(1)
}
type mountOptions struct {
Device string
Target string
Type string
Label string
Flag uint32
}
func mountFrom(dir, device, target, mType, label string) error {
options := &mountOptions{
Device: device,
Target: target,
Type: mType,
Flag: 0,
Label: label,
}
cmd := reexec.Command("docker-mountfrom", dir)
w, err := cmd.StdinPipe()
if err != nil {
return fmt.Errorf("mountfrom error on pipe creation: %v", err)
}
output := bytes.NewBuffer(nil)
cmd.Stdout = output
cmd.Stderr = output
if err := cmd.Start(); err != nil {
return fmt.Errorf("mountfrom error on re-exec cmd: %v", err)
}
//write the options to the pipe for the untar exec to read
if err := json.NewEncoder(w).Encode(options); err != nil {
return fmt.Errorf("mountfrom json encode to pipe failed: %v", err)
}
w.Close()
if err := cmd.Wait(); err != nil {
return fmt.Errorf("mountfrom re-exec error: %v: output: %s", err, output)
}
return nil
}
// mountfromMain is the entry-point for docker-mountfrom on re-exec.
func mountFromMain() {
runtime.LockOSThread()
flag.Parse()
var options *mountOptions
if err := json.NewDecoder(os.Stdin).Decode(&options); err != nil {
fatal(err)
}
if err := os.Chdir(flag.Arg(0)); err != nil {
fatal(err)
}
if err := syscall.Mount(options.Device, options.Target, options.Type, uintptr(options.Flag), options.Label); err != nil {
fatal(err)
}
os.Exit(0)
}

514
vendor/github.com/containers/storage/drivers/overlay2/overlay.go generated vendored Normal file
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// +build linux
package overlay2
import (
"bufio"
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
"strconv"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/drivers"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/directory"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/mount"
"github.com/containers/storage/pkg/parsers"
"github.com/containers/storage/pkg/parsers/kernel"
"github.com/opencontainers/runc/libcontainer/label"
)
var (
// untar defines the untar method
untar = chrootarchive.UntarUncompressed
)
// This backend uses the overlay union filesystem for containers
// with diff directories for each layer.
// This version of the overlay driver requires at least kernel
// 4.0.0 in order to support mounting multiple diff directories.
// Each container/image has at least a "diff" directory and "link" file.
// If there is also a "lower" file when there are diff layers
// below as well as "merged" and "work" directories. The "diff" directory
// has the upper layer of the overlay and is used to capture any
// changes to the layer. The "lower" file contains all the lower layer
// mounts separated by ":" and ordered from uppermost to lowermost
// layers. The overlay itself is mounted in the "merged" directory,
// and the "work" dir is needed for overlay to work.
// The "link" file for each layer contains a unique string for the layer.
// Under the "l" directory at the root there will be a symbolic link
// with that unique string pointing the "diff" directory for the layer.
// The symbolic links are used to reference lower layers in the "lower"
// file and on mount. The links are used to shorten the total length
// of a layer reference without requiring changes to the layer identifier
// or root directory. Mounts are always done relative to root and
// referencing the symbolic links in order to ensure the number of
// lower directories can fit in a single page for making the mount
// syscall. A hard upper limit of 128 lower layers is enforced to ensure
// that mounts do not fail due to length.
const (
driverName = "overlay2"
linkDir = "l"
lowerFile = "lower"
maxDepth = 128
// idLength represents the number of random characters
// which can be used to create the unique link identifer
// for every layer. If this value is too long then the
// page size limit for the mount command may be exceeded.
// The idLength should be selected such that following equation
// is true (512 is a buffer for label metadata).
// ((idLength + len(linkDir) + 1) * maxDepth) <= (pageSize - 512)
idLength = 26
)
// Driver contains information about the home directory and the list of active mounts that are created using this driver.
type Driver struct {
home string
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
ctr *graphdriver.RefCounter
}
var backingFs = "<unknown>"
func init() {
graphdriver.Register(driverName, Init)
}
// Init returns the a native diff driver for overlay filesystem.
// If overlay filesystem is not supported on the host, graphdriver.ErrNotSupported is returned as error.
// If a overlay filesystem is not supported over a existing filesystem then error graphdriver.ErrIncompatibleFS is returned.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
opts, err := parseOptions(options)
if err != nil {
return nil, err
}
if err := supportsOverlay(); err != nil {
return nil, graphdriver.ErrNotSupported
}
// require kernel 4.0.0 to ensure multiple lower dirs are supported
v, err := kernel.GetKernelVersion()
if err != nil {
return nil, err
}
if kernel.CompareKernelVersion(*v, kernel.VersionInfo{Kernel: 4, Major: 0, Minor: 0}) < 0 {
if !opts.overrideKernelCheck {
return nil, graphdriver.ErrNotSupported
}
logrus.Warnf("Using pre-4.0.0 kernel for overlay2, mount failures may require kernel update")
}
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
// check if they are running over btrfs, aufs, zfs, overlay, or ecryptfs
switch fsMagic {
case graphdriver.FsMagicBtrfs, graphdriver.FsMagicAufs, graphdriver.FsMagicZfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicEcryptfs:
logrus.Errorf("'overlay2' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the driver home dir
if err := idtools.MkdirAllAs(path.Join(home, linkDir), 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewFsChecker(graphdriver.FsMagicOverlay)),
}
return d, nil
}
type overlayOptions struct {
overrideKernelCheck bool
}
func parseOptions(options []string) (*overlayOptions, error) {
o := &overlayOptions{}
for _, option := range options {
key, val, err := parsers.ParseKeyValueOpt(option)
if err != nil {
return nil, err
}
key = strings.ToLower(key)
switch key {
case "overlay2.override_kernel_check":
o.overrideKernelCheck, err = strconv.ParseBool(val)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("overlay2: Unknown option %s\n", key)
}
}
return o, nil
}
func supportsOverlay() error {
// We can try to modprobe overlay first before looking at
// proc/filesystems for when overlay is supported
exec.Command("modprobe", "overlay").Run()
f, err := os.Open("/proc/filesystems")
if err != nil {
return err
}
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
if s.Text() == "nodev\toverlay" {
return nil
}
}
logrus.Error("'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.")
return graphdriver.ErrNotSupported
}
func (d *Driver) String() string {
return driverName
}
// Status returns current driver information in a two dimensional string array.
// Output contains "Backing Filesystem" used in this implementation.
func (d *Driver) Status() [][2]string {
return [][2]string{
{"Backing Filesystem", backingFs},
}
}
// GetMetadata returns meta data about the overlay driver such as
// LowerDir, UpperDir, WorkDir and MergeDir used to store data.
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
dir := d.dir(id)
if _, err := os.Stat(dir); err != nil {
return nil, err
}
metadata := map[string]string{
"WorkDir": path.Join(dir, "work"),
"MergedDir": path.Join(dir, "merged"),
"UpperDir": path.Join(dir, "diff"),
}
lowerDirs, err := d.getLowerDirs(id)
if err != nil {
return nil, err
}
if len(lowerDirs) > 0 {
metadata["LowerDir"] = strings.Join(lowerDirs, ":")
}
return metadata, nil
}
// Cleanup any state created by overlay which should be cleaned when daemon
// is being shutdown. For now, we just have to unmount the bind mounted
// we had created.
func (d *Driver) Cleanup() error {
return mount.Unmount(d.home)
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
return d.Create(id, parent, mountLabel, storageOpt)
}
// Create is used to create the upper, lower, and merge directories required for overlay fs for a given id.
// The parent filesystem is used to configure these directories for the overlay.
func (d *Driver) Create(id, parent, mountLabel string, storageOpt map[string]string) (retErr error) {
if len(storageOpt) != 0 {
return fmt.Errorf("--storage-opt is not supported for overlay")
}
dir := d.dir(id)
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
return err
}
if err := idtools.MkdirAllAs(path.Dir(dir), 0700, rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(dir, 0700, rootUID, rootGID); err != nil {
return err
}
defer func() {
// Clean up on failure
if retErr != nil {
os.RemoveAll(dir)
}
}()
if err := idtools.MkdirAs(path.Join(dir, "diff"), 0755, rootUID, rootGID); err != nil {
return err
}
lid := generateID(idLength)
if err := os.Symlink(path.Join("..", id, "diff"), path.Join(d.home, linkDir, lid)); err != nil {
return err
}
// Write link id to link file
if err := ioutil.WriteFile(path.Join(dir, "link"), []byte(lid), 0644); err != nil {
return err
}
// if no parent directory, done
if parent == "" {
return nil
}
if err := idtools.MkdirAs(path.Join(dir, "work"), 0700, rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(path.Join(dir, "merged"), 0700, rootUID, rootGID); err != nil {
return err
}
lower, err := d.getLower(parent)
if err != nil {
return err
}
if lower != "" {
if err := ioutil.WriteFile(path.Join(dir, lowerFile), []byte(lower), 0666); err != nil {
return err
}
}
return nil
}
func (d *Driver) getLower(parent string) (string, error) {
parentDir := d.dir(parent)
// Ensure parent exists
if _, err := os.Lstat(parentDir); err != nil {
return "", err
}
// Read Parent link fileA
parentLink, err := ioutil.ReadFile(path.Join(parentDir, "link"))
if err != nil {
return "", err
}
lowers := []string{path.Join(linkDir, string(parentLink))}
parentLower, err := ioutil.ReadFile(path.Join(parentDir, lowerFile))
if err == nil {
parentLowers := strings.Split(string(parentLower), ":")
lowers = append(lowers, parentLowers...)
}
if len(lowers) > maxDepth {
return "", errors.New("max depth exceeded")
}
return strings.Join(lowers, ":"), nil
}
func (d *Driver) dir(id string) string {
return path.Join(d.home, id)
}
func (d *Driver) getLowerDirs(id string) ([]string, error) {
var lowersArray []string
lowers, err := ioutil.ReadFile(path.Join(d.dir(id), lowerFile))
if err == nil {
for _, s := range strings.Split(string(lowers), ":") {
lp, err := os.Readlink(path.Join(d.home, s))
if err != nil {
return nil, err
}
lowersArray = append(lowersArray, path.Clean(path.Join(d.home, "link", lp)))
}
} else if !os.IsNotExist(err) {
return nil, err
}
return lowersArray, nil
}
// Remove cleans the directories that are created for this id.
func (d *Driver) Remove(id string) error {
dir := d.dir(id)
lid, err := ioutil.ReadFile(path.Join(dir, "link"))
if err == nil {
if err := os.RemoveAll(path.Join(d.home, linkDir, string(lid))); err != nil {
logrus.Debugf("Failed to remove link: %v", err)
}
}
if err := os.RemoveAll(dir); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
// Get creates and mounts the required file system for the given id and returns the mount path.
func (d *Driver) Get(id string, mountLabel string) (s string, err error) {
dir := d.dir(id)
if _, err := os.Stat(dir); err != nil {
return "", err
}
diffDir := path.Join(dir, "diff")
lowers, err := ioutil.ReadFile(path.Join(dir, lowerFile))
if err != nil {
// If no lower, just return diff directory
if os.IsNotExist(err) {
return diffDir, nil
}
return "", err
}
mergedDir := path.Join(dir, "merged")
if count := d.ctr.Increment(mergedDir); count > 1 {
return mergedDir, nil
}
defer func() {
if err != nil {
if c := d.ctr.Decrement(mergedDir); c <= 0 {
syscall.Unmount(mergedDir, 0)
}
}
}()
workDir := path.Join(dir, "work")
opts := fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", string(lowers), path.Join(id, "diff"), path.Join(id, "work"))
mountLabel = label.FormatMountLabel(opts, mountLabel)
if len(mountLabel) > syscall.Getpagesize() {
return "", fmt.Errorf("cannot mount layer, mount label too large %d", len(mountLabel))
}
if err := mountFrom(d.home, "overlay", path.Join(id, "merged"), "overlay", mountLabel); err != nil {
return "", fmt.Errorf("error creating overlay mount to %s: %v", mergedDir, err)
}
// chown "workdir/work" to the remapped root UID/GID. Overlay fs inside a
// user namespace requires this to move a directory from lower to upper.
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
return "", err
}
if err := os.Chown(path.Join(workDir, "work"), rootUID, rootGID); err != nil {
return "", err
}
return mergedDir, nil
}
// Put unmounts the mount path created for the give id.
func (d *Driver) Put(id string) error {
mountpoint := path.Join(d.dir(id), "merged")
if count := d.ctr.Decrement(mountpoint); count > 0 {
return nil
}
err := syscall.Unmount(mountpoint, 0)
if err != nil {
if _, err := ioutil.ReadFile(path.Join(d.dir(id), lowerFile)); err != nil {
// We didn't have a "lower" directory, so we weren't mounting a "merged" directory anyway
return nil
}
logrus.Debugf("Failed to unmount %s overlay: %v", id, err)
}
return err
}
// Exists checks to see if the id is already mounted.
func (d *Driver) Exists(id string) bool {
_, err := os.Stat(d.dir(id))
return err == nil
}
// ApplyDiff applies the new layer into a root
func (d *Driver) ApplyDiff(id string, parent string, diff archive.Reader) (size int64, err error) {
applyDir := d.getDiffPath(id)
logrus.Debugf("Applying tar in %s", applyDir)
// Overlay doesn't need the parent id to apply the diff
if err := untar(diff, applyDir, &archive.TarOptions{
UIDMaps: d.uidMaps,
GIDMaps: d.gidMaps,
WhiteoutFormat: archive.OverlayWhiteoutFormat,
}); err != nil {
return 0, err
}
return d.DiffSize(id, parent)
}
func (d *Driver) getDiffPath(id string) string {
dir := d.dir(id)
return path.Join(dir, "diff")
}
// DiffSize calculates the changes between the specified id
// and its parent and returns the size in bytes of the changes
// relative to its base filesystem directory.
func (d *Driver) DiffSize(id, parent string) (size int64, err error) {
return directory.Size(d.getDiffPath(id))
}
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (d *Driver) Diff(id, parent string) (archive.Archive, error) {
diffPath := d.getDiffPath(id)
logrus.Debugf("Tar with options on %s", diffPath)
return archive.TarWithOptions(diffPath, &archive.TarOptions{
Compression: archive.Uncompressed,
UIDMaps: d.uidMaps,
GIDMaps: d.gidMaps,
WhiteoutFormat: archive.OverlayWhiteoutFormat,
})
}
// Changes produces a list of changes between the specified layer
// and its parent layer. If parent is "", then all changes will be ADD changes.
func (d *Driver) Changes(id, parent string) ([]archive.Change, error) {
// Overlay doesn't have snapshots, so we need to get changes from all parent
// layers.
diffPath := d.getDiffPath(id)
layers, err := d.getLowerDirs(id)
if err != nil {
return nil, err
}
return archive.OverlayChanges(layers, diffPath)
}

3
vendor/github.com/containers/storage/drivers/overlay2/overlay_unsupported.go generated vendored Normal file
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// +build !linux
package overlay2

80
vendor/github.com/containers/storage/drivers/overlay2/randomid.go generated vendored Normal file
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@ -0,0 +1,80 @@
// +build linux
package overlay2
import (
"crypto/rand"
"encoding/base32"
"fmt"
"io"
"os"
"syscall"
"time"
"github.com/Sirupsen/logrus"
)
// generateID creates a new random string identifier with the given length
func generateID(l int) string {
const (
// ensures we backoff for less than 450ms total. Use the following to
// select new value, in units of 10ms:
// n*(n+1)/2 = d -> n^2 + n - 2d -> n = (sqrt(8d + 1) - 1)/2
maxretries = 9
backoff = time.Millisecond * 10
)
var (
totalBackoff time.Duration
count int
retries int
size = (l*5 + 7) / 8
u = make([]byte, size)
)
// TODO: Include time component, counter component, random component
for {
// This should never block but the read may fail. Because of this,
// we just try to read the random number generator until we get
// something. This is a very rare condition but may happen.
b := time.Duration(retries) * backoff
time.Sleep(b)
totalBackoff += b
n, err := io.ReadFull(rand.Reader, u[count:])
if err != nil {
if retryOnError(err) && retries < maxretries {
count += n
retries++
logrus.Errorf("error generating version 4 uuid, retrying: %v", err)
continue
}
// Any other errors represent a system problem. What did someone
// do to /dev/urandom?
panic(fmt.Errorf("error reading random number generator, retried for %v: %v", totalBackoff.String(), err))
}
break
}
s := base32.StdEncoding.EncodeToString(u)
return s[:l]
}
// retryOnError tries to detect whether or not retrying would be fruitful.
func retryOnError(err error) bool {
switch err := err.(type) {
case *os.PathError:
return retryOnError(err.Err) // unpack the target error
case syscall.Errno:
if err == syscall.EPERM {
// EPERM represents an entropy pool exhaustion, a condition under
// which we backoff and retry.
return true
}
}
return false
}

32
vendor/github.com/containers/storage/drivers/plugin.go generated vendored Normal file
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// +build experimental
package graphdriver
import (
"fmt"
"io"
"github.com/containers/storage/pkg/plugins"
)
type pluginClient interface {
// Call calls the specified method with the specified arguments for the plugin.
Call(string, interface{}, interface{}) error
// Stream calls the specified method with the specified arguments for the plugin and returns the response IO stream
Stream(string, interface{}) (io.ReadCloser, error)
// SendFile calls the specified method, and passes through the IO stream
SendFile(string, io.Reader, interface{}) error
}
func lookupPlugin(name, home string, opts []string) (Driver, error) {
pl, err := plugins.Get(name, "GraphDriver")
if err != nil {
return nil, fmt.Errorf("Error looking up graphdriver plugin %s: %v", name, err)
}
return newPluginDriver(name, home, opts, pl.Client())
}
func newPluginDriver(name, home string, opts []string, c pluginClient) (Driver, error) {
proxy := &graphDriverProxy{name, c}
return proxy, proxy.Init(home, opts)
}

7
vendor/github.com/containers/storage/drivers/plugin_unsupported.go generated vendored Normal file
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// +build !experimental
package graphdriver
func lookupPlugin(name, home string, opts []string) (Driver, error) {
return nil, ErrNotSupported
}

225
vendor/github.com/containers/storage/drivers/proxy.go generated vendored Normal file
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// +build experimental
package graphdriver
import (
"errors"
"fmt"
"github.com/containers/storage/pkg/archive"
)
type graphDriverProxy struct {
name string
client pluginClient
}
type graphDriverRequest struct {
ID string `json:",omitempty"`
Parent string `json:",omitempty"`
MountLabel string `json:",omitempty"`
}
type graphDriverResponse struct {
Err string `json:",omitempty"`
Dir string `json:",omitempty"`
Exists bool `json:",omitempty"`
Status [][2]string `json:",omitempty"`
Changes []archive.Change `json:",omitempty"`
Size int64 `json:",omitempty"`
Metadata map[string]string `json:",omitempty"`
}
type graphDriverInitRequest struct {
Home string
Opts []string
}
func (d *graphDriverProxy) Init(home string, opts []string) error {
args := &graphDriverInitRequest{
Home: home,
Opts: opts,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Init", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) String() string {
return d.name
}
func (d *graphDriverProxy) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
args := &graphDriverRequest{
ID: id,
Parent: parent,
MountLabel: mountLabel,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.CreateReadWrite", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Create(id, parent, mountLabel string, storageOpt map[string]string) error {
args := &graphDriverRequest{
ID: id,
Parent: parent,
MountLabel: mountLabel,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Create", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Remove(id string) error {
args := &graphDriverRequest{ID: id}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Remove", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Get(id, mountLabel string) (string, error) {
args := &graphDriverRequest{
ID: id,
MountLabel: mountLabel,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Get", args, &ret); err != nil {
return "", err
}
var err error
if ret.Err != "" {
err = errors.New(ret.Err)
}
return ret.Dir, err
}
func (d *graphDriverProxy) Put(id string) error {
args := &graphDriverRequest{ID: id}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Put", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Exists(id string) bool {
args := &graphDriverRequest{ID: id}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Exists", args, &ret); err != nil {
return false
}
return ret.Exists
}
func (d *graphDriverProxy) Status() [][2]string {
args := &graphDriverRequest{}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Status", args, &ret); err != nil {
return nil
}
return ret.Status
}
func (d *graphDriverProxy) GetMetadata(id string) (map[string]string, error) {
args := &graphDriverRequest{
ID: id,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.GetMetadata", args, &ret); err != nil {
return nil, err
}
if ret.Err != "" {
return nil, errors.New(ret.Err)
}
return ret.Metadata, nil
}
func (d *graphDriverProxy) Cleanup() error {
args := &graphDriverRequest{}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Cleanup", args, &ret); err != nil {
return nil
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Diff(id, parent string) (archive.Archive, error) {
args := &graphDriverRequest{
ID: id,
Parent: parent,
}
body, err := d.client.Stream("GraphDriver.Diff", args)
if err != nil {
return nil, err
}
return archive.Archive(body), nil
}
func (d *graphDriverProxy) Changes(id, parent string) ([]archive.Change, error) {
args := &graphDriverRequest{
ID: id,
Parent: parent,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Changes", args, &ret); err != nil {
return nil, err
}
if ret.Err != "" {
return nil, errors.New(ret.Err)
}
return ret.Changes, nil
}
func (d *graphDriverProxy) ApplyDiff(id, parent string, diff archive.Reader) (int64, error) {
var ret graphDriverResponse
if err := d.client.SendFile(fmt.Sprintf("GraphDriver.ApplyDiff?id=%s&parent=%s", id, parent), diff, &ret); err != nil {
return -1, err
}
if ret.Err != "" {
return -1, errors.New(ret.Err)
}
return ret.Size, nil
}
func (d *graphDriverProxy) DiffSize(id, parent string) (int64, error) {
args := &graphDriverRequest{
ID: id,
Parent: parent,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.DiffSize", args, &ret); err != nil {
return -1, err
}
if ret.Err != "" {
return -1, errors.New(ret.Err)
}
return ret.Size, nil
}

8
vendor/github.com/containers/storage/drivers/register/register_aufs.go generated vendored Normal file
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@ -0,0 +1,8 @@
// +build !exclude_graphdriver_aufs,linux
package register
import (
// register the aufs graphdriver
_ "github.com/containers/storage/drivers/aufs"
)

8
vendor/github.com/containers/storage/drivers/register/register_btrfs.go generated vendored Normal file
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@ -0,0 +1,8 @@
// +build !exclude_graphdriver_btrfs,linux
package register
import (
// register the btrfs graphdriver
_ "github.com/containers/storage/drivers/btrfs"
)

8
vendor/github.com/containers/storage/drivers/register/register_devicemapper.go generated vendored Normal file
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@ -0,0 +1,8 @@
// +build !exclude_graphdriver_devicemapper,linux
package register
import (
// register the devmapper graphdriver
_ "github.com/containers/storage/drivers/devmapper"
)

9
vendor/github.com/containers/storage/drivers/register/register_overlay.go generated vendored Normal file
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@ -0,0 +1,9 @@
// +build !exclude_graphdriver_overlay,linux
package register
import (
// register the overlay graphdriver
_ "github.com/containers/storage/drivers/overlay"
_ "github.com/containers/storage/drivers/overlay2"
)

6
vendor/github.com/containers/storage/drivers/register/register_vfs.go generated vendored Normal file
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@ -0,0 +1,6 @@
package register
import (
// register vfs
_ "github.com/containers/storage/drivers/vfs"
)

6
vendor/github.com/containers/storage/drivers/register/register_windows.go generated vendored Normal file
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@ -0,0 +1,6 @@
package register
import (
// register the windows graph driver
_ "github.com/containers/storage/drivers/windows"
)

8
vendor/github.com/containers/storage/drivers/register/register_zfs.go generated vendored Normal file
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@ -0,0 +1,8 @@
// +build !exclude_graphdriver_zfs,linux !exclude_graphdriver_zfs,freebsd, solaris
package register
import (
// register the zfs driver
_ "github.com/containers/storage/drivers/zfs"
)

145
vendor/github.com/containers/storage/drivers/vfs/driver.go generated vendored Normal file
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@ -0,0 +1,145 @@
package vfs
import (
"fmt"
"os"
"path/filepath"
"github.com/containers/storage/drivers"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/idtools"
"github.com/opencontainers/runc/libcontainer/label"
)
var (
// CopyWithTar defines the copy method to use.
CopyWithTar = chrootarchive.CopyWithTar
)
func init() {
graphdriver.Register("vfs", Init)
}
// Init returns a new VFS driver.
// This sets the home directory for the driver and returns NaiveDiffDriver.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
d := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
if err := idtools.MkdirAllAs(home, 0700, rootUID, rootGID); err != nil {
return nil, err
}
return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
// Driver holds information about the driver, home directory of the driver.
// Driver implements graphdriver.ProtoDriver. It uses only basic vfs operations.
// In order to support layering, files are copied from the parent layer into the new layer. There is no copy-on-write support.
// Driver must be wrapped in NaiveDiffDriver to be used as a graphdriver.Driver
type Driver struct {
home string
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
}
func (d *Driver) String() string {
return "vfs"
}
// Status is used for implementing the graphdriver.ProtoDriver interface. VFS does not currently have any status information.
func (d *Driver) Status() [][2]string {
return nil
}
// GetMetadata is used for implementing the graphdriver.ProtoDriver interface. VFS does not currently have any meta data.
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
return nil, nil
}
// Cleanup is used to implement graphdriver.ProtoDriver. There is no cleanup required for this driver.
func (d *Driver) Cleanup() error {
return nil
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
return d.Create(id, parent, mountLabel, storageOpt)
}
// Create prepares the filesystem for the VFS driver and copies the directory for the given id under the parent.
func (d *Driver) Create(id, parent, mountLabel string, storageOpt map[string]string) error {
if len(storageOpt) != 0 {
return fmt.Errorf("--storage-opt is not supported for vfs")
}
dir := d.dir(id)
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
return err
}
if err := idtools.MkdirAllAs(filepath.Dir(dir), 0700, rootUID, rootGID); err != nil {
return err
}
if err := idtools.MkdirAs(dir, 0755, rootUID, rootGID); err != nil {
return err
}
opts := []string{"level:s0"}
if _, mountLabel, err := label.InitLabels(opts); err == nil {
label.SetFileLabel(dir, mountLabel)
}
if parent == "" {
return nil
}
parentDir, err := d.Get(parent, "")
if err != nil {
return fmt.Errorf("%s: %s", parent, err)
}
if err := CopyWithTar(parentDir, dir); err != nil {
return err
}
return nil
}
func (d *Driver) dir(id string) string {
return filepath.Join(d.home, "dir", filepath.Base(id))
}
// Remove deletes the content from the directory for a given id.
func (d *Driver) Remove(id string) error {
if err := os.RemoveAll(d.dir(id)); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
// Get returns the directory for the given id.
func (d *Driver) Get(id, mountLabel string) (string, error) {
dir := d.dir(id)
if st, err := os.Stat(dir); err != nil {
return "", err
} else if !st.IsDir() {
return "", fmt.Errorf("%s: not a directory", dir)
}
return dir, nil
}
// Put is a noop for vfs that return nil for the error, since this driver has no runtime resources to clean up.
func (d *Driver) Put(id string) error {
// The vfs driver has no runtime resources (e.g. mounts)
// to clean up, so we don't need anything here
return nil
}
// Exists checks to see if the directory exists for the given id.
func (d *Driver) Exists(id string) bool {
_, err := os.Stat(d.dir(id))
return err == nil
}

2
vendor/github.com/containers/storage/drivers/zfs/MAINTAINERS generated vendored Normal file
View file

@ -0,0 +1,2 @@
Jörg Thalheim <joerg@higgsboson.tk> (@Mic92)
Arthur Gautier <baloo@gandi.net> (@baloose)

405
vendor/github.com/containers/storage/drivers/zfs/zfs.go generated vendored Normal file
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@ -0,0 +1,405 @@
// +build linux freebsd solaris
package zfs
import (
"fmt"
"os"
"os/exec"
"path"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/drivers"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/mount"
"github.com/containers/storage/pkg/parsers"
zfs "github.com/mistifyio/go-zfs"
"github.com/opencontainers/runc/libcontainer/label"
)
type zfsOptions struct {
fsName string
mountPath string
}
func init() {
graphdriver.Register("zfs", Init)
}
// Logger returns a zfs logger implementation.
type Logger struct{}
// Log wraps log message from ZFS driver with a prefix '[zfs]'.
func (*Logger) Log(cmd []string) {
logrus.Debugf("[zfs] %s", strings.Join(cmd, " "))
}
// Init returns a new ZFS driver.
// It takes base mount path and an array of options which are represented as key value pairs.
// Each option is in the for key=value. 'zfs.fsname' is expected to be a valid key in the options.
func Init(base string, opt []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
var err error
if _, err := exec.LookPath("zfs"); err != nil {
logrus.Debugf("[zfs] zfs command is not available: %v", err)
return nil, graphdriver.ErrPrerequisites
}
file, err := os.OpenFile("/dev/zfs", os.O_RDWR, 600)
if err != nil {
logrus.Debugf("[zfs] cannot open /dev/zfs: %v", err)
return nil, graphdriver.ErrPrerequisites
}
defer file.Close()
options, err := parseOptions(opt)
if err != nil {
return nil, err
}
options.mountPath = base
rootdir := path.Dir(base)
if options.fsName == "" {
err = checkRootdirFs(rootdir)
if err != nil {
return nil, err
}
}
if options.fsName == "" {
options.fsName, err = lookupZfsDataset(rootdir)
if err != nil {
return nil, err
}
}
zfs.SetLogger(new(Logger))
filesystems, err := zfs.Filesystems(options.fsName)
if err != nil {
return nil, fmt.Errorf("Cannot find root filesystem %s: %v", options.fsName, err)
}
filesystemsCache := make(map[string]bool, len(filesystems))
var rootDataset *zfs.Dataset
for _, fs := range filesystems {
if fs.Name == options.fsName {
rootDataset = fs
}
filesystemsCache[fs.Name] = true
}
if rootDataset == nil {
return nil, fmt.Errorf("BUG: zfs get all -t filesystem -rHp '%s' should contain '%s'", options.fsName, options.fsName)
}
if err := mount.MakePrivate(base); err != nil {
return nil, err
}
d := &Driver{
dataset: rootDataset,
options: options,
filesystemsCache: filesystemsCache,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewDefaultChecker()),
}
return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
func parseOptions(opt []string) (zfsOptions, error) {
var options zfsOptions
options.fsName = ""
for _, option := range opt {
key, val, err := parsers.ParseKeyValueOpt(option)
if err != nil {
return options, err
}
key = strings.ToLower(key)
switch key {
case "zfs.fsname":
options.fsName = val
default:
return options, fmt.Errorf("Unknown option %s", key)
}
}
return options, nil
}
func lookupZfsDataset(rootdir string) (string, error) {
var stat syscall.Stat_t
if err := syscall.Stat(rootdir, &stat); err != nil {
return "", fmt.Errorf("Failed to access '%s': %s", rootdir, err)
}
wantedDev := stat.Dev
mounts, err := mount.GetMounts()
if err != nil {
return "", err
}
for _, m := range mounts {
if err := syscall.Stat(m.Mountpoint, &stat); err != nil {
logrus.Debugf("[zfs] failed to stat '%s' while scanning for zfs mount: %v", m.Mountpoint, err)
continue // may fail on fuse file systems
}
if stat.Dev == wantedDev && m.Fstype == "zfs" {
return m.Source, nil
}
}
return "", fmt.Errorf("Failed to find zfs dataset mounted on '%s' in /proc/mounts", rootdir)
}
// Driver holds information about the driver, such as zfs dataset, options and cache.
type Driver struct {
dataset *zfs.Dataset
options zfsOptions
sync.Mutex // protects filesystem cache against concurrent access
filesystemsCache map[string]bool
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
ctr *graphdriver.RefCounter
}
func (d *Driver) String() string {
return "zfs"
}
// Cleanup is used to implement graphdriver.ProtoDriver. There is no cleanup required for this driver.
func (d *Driver) Cleanup() error {
return nil
}
// Status returns information about the ZFS filesystem. It returns a two dimensional array of information
// such as pool name, dataset name, disk usage, parent quota and compression used.
// Currently it return 'Zpool', 'Zpool Health', 'Parent Dataset', 'Space Used By Parent',
// 'Space Available', 'Parent Quota' and 'Compression'.
func (d *Driver) Status() [][2]string {
parts := strings.Split(d.dataset.Name, "/")
pool, err := zfs.GetZpool(parts[0])
var poolName, poolHealth string
if err == nil {
poolName = pool.Name
poolHealth = pool.Health
} else {
poolName = fmt.Sprintf("error while getting pool information %v", err)
poolHealth = "not available"
}
quota := "no"
if d.dataset.Quota != 0 {
quota = strconv.FormatUint(d.dataset.Quota, 10)
}
return [][2]string{
{"Zpool", poolName},
{"Zpool Health", poolHealth},
{"Parent Dataset", d.dataset.Name},
{"Space Used By Parent", strconv.FormatUint(d.dataset.Used, 10)},
{"Space Available", strconv.FormatUint(d.dataset.Avail, 10)},
{"Parent Quota", quota},
{"Compression", d.dataset.Compression},
}
}
// GetMetadata returns image/container metadata related to graph driver
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
return nil, nil
}
func (d *Driver) cloneFilesystem(name, parentName string) error {
snapshotName := fmt.Sprintf("%d", time.Now().Nanosecond())
parentDataset := zfs.Dataset{Name: parentName}
snapshot, err := parentDataset.Snapshot(snapshotName /*recursive */, false)
if err != nil {
return err
}
_, err = snapshot.Clone(name, map[string]string{"mountpoint": "legacy"})
if err == nil {
d.Lock()
d.filesystemsCache[name] = true
d.Unlock()
}
if err != nil {
snapshot.Destroy(zfs.DestroyDeferDeletion)
return err
}
return snapshot.Destroy(zfs.DestroyDeferDeletion)
}
func (d *Driver) zfsPath(id string) string {
return d.options.fsName + "/" + id
}
func (d *Driver) mountPath(id string) string {
return path.Join(d.options.mountPath, "graph", getMountpoint(id))
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
return d.Create(id, parent, mountLabel, storageOpt)
}
// Create prepares the dataset and filesystem for the ZFS driver for the given id under the parent.
func (d *Driver) Create(id string, parent string, mountLabel string, storageOpt map[string]string) error {
err := d.create(id, parent, storageOpt)
if err == nil {
return nil
}
if zfsError, ok := err.(*zfs.Error); ok {
if !strings.HasSuffix(zfsError.Stderr, "dataset already exists\n") {
return err
}
// aborted build -> cleanup
} else {
return err
}
dataset := zfs.Dataset{Name: d.zfsPath(id)}
if err := dataset.Destroy(zfs.DestroyRecursiveClones); err != nil {
return err
}
// retry
return d.create(id, parent, storageOpt)
}
func (d *Driver) create(id, parent string, storageOpt map[string]string) error {
name := d.zfsPath(id)
quota, err := parseStorageOpt(storageOpt)
if err != nil {
return err
}
if parent == "" {
mountoptions := map[string]string{"mountpoint": "legacy"}
fs, err := zfs.CreateFilesystem(name, mountoptions)
if err == nil {
err = setQuota(name, quota)
if err == nil {
d.Lock()
d.filesystemsCache[fs.Name] = true
d.Unlock()
}
}
return err
}
err = d.cloneFilesystem(name, d.zfsPath(parent))
if err == nil {
err = setQuota(name, quota)
}
return err
}
func parseStorageOpt(storageOpt map[string]string) (string, error) {
// Read size to change the disk quota per container
for k, v := range storageOpt {
key := strings.ToLower(k)
switch key {
case "size":
return v, nil
default:
return "0", fmt.Errorf("Unknown option %s", key)
}
}
return "0", nil
}
func setQuota(name string, quota string) error {
if quota == "0" {
return nil
}
fs, err := zfs.GetDataset(name)
if err != nil {
return err
}
return fs.SetProperty("quota", quota)
}
// Remove deletes the dataset, filesystem and the cache for the given id.
func (d *Driver) Remove(id string) error {
name := d.zfsPath(id)
dataset := zfs.Dataset{Name: name}
err := dataset.Destroy(zfs.DestroyRecursive)
if err == nil {
d.Lock()
delete(d.filesystemsCache, name)
d.Unlock()
}
return err
}
// Get returns the mountpoint for the given id after creating the target directories if necessary.
func (d *Driver) Get(id, mountLabel string) (string, error) {
mountpoint := d.mountPath(id)
if count := d.ctr.Increment(mountpoint); count > 1 {
return mountpoint, nil
}
filesystem := d.zfsPath(id)
options := label.FormatMountLabel("", mountLabel)
logrus.Debugf(`[zfs] mount("%s", "%s", "%s")`, filesystem, mountpoint, options)
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
d.ctr.Decrement(mountpoint)
return "", err
}
// Create the target directories if they don't exist
if err := idtools.MkdirAllAs(mountpoint, 0755, rootUID, rootGID); err != nil {
d.ctr.Decrement(mountpoint)
return "", err
}
if err := mount.Mount(filesystem, mountpoint, "zfs", options); err != nil {
d.ctr.Decrement(mountpoint)
return "", fmt.Errorf("error creating zfs mount of %s to %s: %v", filesystem, mountpoint, err)
}
// this could be our first mount after creation of the filesystem, and the root dir may still have root
// permissions instead of the remapped root uid:gid (if user namespaces are enabled):
if err := os.Chown(mountpoint, rootUID, rootGID); err != nil {
mount.Unmount(mountpoint)
d.ctr.Decrement(mountpoint)
return "", fmt.Errorf("error modifying zfs mountpoint (%s) directory ownership: %v", mountpoint, err)
}
return mountpoint, nil
}
// Put removes the existing mountpoint for the given id if it exists.
func (d *Driver) Put(id string) error {
mountpoint := d.mountPath(id)
if count := d.ctr.Decrement(mountpoint); count > 0 {
return nil
}
mounted, err := graphdriver.Mounted(graphdriver.FsMagicZfs, mountpoint)
if err != nil || !mounted {
return err
}
logrus.Debugf(`[zfs] unmount("%s")`, mountpoint)
err = mount.Unmount(mountpoint)
if err != nil {
return fmt.Errorf("error unmounting to %s: %v", mountpoint, err)
}
return err
}
// Exists checks to see if the cache entry exists for the given id.
func (d *Driver) Exists(id string) bool {
d.Lock()
defer d.Unlock()
return d.filesystemsCache[d.zfsPath(id)] == true
}

38
vendor/github.com/containers/storage/drivers/zfs/zfs_freebsd.go generated vendored Normal file
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@ -0,0 +1,38 @@
package zfs
import (
"fmt"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/drivers"
)
func checkRootdirFs(rootdir string) error {
var buf syscall.Statfs_t
if err := syscall.Statfs(rootdir, &buf); err != nil {
return fmt.Errorf("Failed to access '%s': %s", rootdir, err)
}
// on FreeBSD buf.Fstypename contains ['z', 'f', 's', 0 ... ]
if (buf.Fstypename[0] != 122) || (buf.Fstypename[1] != 102) || (buf.Fstypename[2] != 115) || (buf.Fstypename[3] != 0) {
logrus.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir)
return graphdriver.ErrPrerequisites
}
return nil
}
func getMountpoint(id string) string {
maxlen := 12
// we need to preserve filesystem suffix
suffix := strings.SplitN(id, "-", 2)
if len(suffix) > 1 {
return id[:maxlen] + "-" + suffix[1]
}
return id[:maxlen]
}

27
vendor/github.com/containers/storage/drivers/zfs/zfs_linux.go generated vendored Normal file
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@ -0,0 +1,27 @@
package zfs
import (
"fmt"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/drivers"
)
func checkRootdirFs(rootdir string) error {
var buf syscall.Statfs_t
if err := syscall.Statfs(rootdir, &buf); err != nil {
return fmt.Errorf("Failed to access '%s': %s", rootdir, err)
}
if graphdriver.FsMagic(buf.Type) != graphdriver.FsMagicZfs {
logrus.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir)
return graphdriver.ErrPrerequisites
}
return nil
}
func getMountpoint(id string) string {
return id
}

59
vendor/github.com/containers/storage/drivers/zfs/zfs_solaris.go generated vendored Normal file
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@ -0,0 +1,59 @@
// +build solaris,cgo
package zfs
/*
#include <sys/statvfs.h>
#include <stdlib.h>
static inline struct statvfs *getstatfs(char *s) {
struct statvfs *buf;
int err;
buf = (struct statvfs *)malloc(sizeof(struct statvfs));
err = statvfs(s, buf);
return buf;
}
*/
import "C"
import (
"path/filepath"
"strings"
"unsafe"
log "github.com/Sirupsen/logrus"
"github.com/containers/storage/drivers"
)
func checkRootdirFs(rootdir string) error {
cs := C.CString(filepath.Dir(rootdir))
buf := C.getstatfs(cs)
// on Solaris buf.f_basetype contains ['z', 'f', 's', 0 ... ]
if (buf.f_basetype[0] != 122) || (buf.f_basetype[1] != 102) || (buf.f_basetype[2] != 115) ||
(buf.f_basetype[3] != 0) {
log.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir)
C.free(unsafe.Pointer(buf))
return graphdriver.ErrPrerequisites
}
C.free(unsafe.Pointer(buf))
C.free(unsafe.Pointer(cs))
return nil
}
/* rootfs is introduced to comply with the OCI spec
which states that root filesystem must be mounted at <CID>/rootfs/ instead of <CID>/
*/
func getMountpoint(id string) string {
maxlen := 12
// we need to preserve filesystem suffix
suffix := strings.SplitN(id, "-", 2)
if len(suffix) > 1 {
return filepath.Join(id[:maxlen]+"-"+suffix[1], "rootfs", "root")
}
return filepath.Join(id[:maxlen], "rootfs", "root")
}

11
vendor/github.com/containers/storage/drivers/zfs/zfs_unsupported.go generated vendored Normal file
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@ -0,0 +1,11 @@
// +build !linux,!freebsd,!solaris
package zfs
func checkRootdirFs(rootdir string) error {
return nil
}
func getMountpoint(id string) string {
return id
}

1147
vendor/github.com/containers/storage/pkg/archive/archive.go generated vendored Normal file
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File diff suppressed because it is too large Load diff

91
vendor/github.com/containers/storage/pkg/archive/archive_linux.go generated vendored Normal file
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@ -0,0 +1,91 @@
package archive
import (
"archive/tar"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/containers/storage/pkg/system"
)
func getWhiteoutConverter(format WhiteoutFormat) tarWhiteoutConverter {
if format == OverlayWhiteoutFormat {
return overlayWhiteoutConverter{}
}
return nil
}
type overlayWhiteoutConverter struct{}
func (overlayWhiteoutConverter) ConvertWrite(hdr *tar.Header, path string, fi os.FileInfo) error {
// convert whiteouts to AUFS format
if fi.Mode()&os.ModeCharDevice != 0 && hdr.Devmajor == 0 && hdr.Devminor == 0 {
// we just rename the file and make it normal
dir, filename := filepath.Split(hdr.Name)
hdr.Name = filepath.Join(dir, WhiteoutPrefix+filename)
hdr.Mode = 0600
hdr.Typeflag = tar.TypeReg
hdr.Size = 0
}
if fi.Mode()&os.ModeDir != 0 {
// convert opaque dirs to AUFS format by writing an empty file with the prefix
opaque, err := system.Lgetxattr(path, "trusted.overlay.opaque")
if err != nil {
return err
}
if opaque != nil && len(opaque) == 1 && opaque[0] == 'y' {
// create a header for the whiteout file
// it should inherit some properties from the parent, but be a regular file
*hdr = tar.Header{
Typeflag: tar.TypeReg,
Mode: hdr.Mode & int64(os.ModePerm),
Name: filepath.Join(hdr.Name, WhiteoutOpaqueDir),
Size: 0,
Uid: hdr.Uid,
Uname: hdr.Uname,
Gid: hdr.Gid,
Gname: hdr.Gname,
AccessTime: hdr.AccessTime,
ChangeTime: hdr.ChangeTime,
}
}
}
return nil
}
func (overlayWhiteoutConverter) ConvertRead(hdr *tar.Header, path string) (bool, error) {
base := filepath.Base(path)
dir := filepath.Dir(path)
// if a directory is marked as opaque by the AUFS special file, we need to translate that to overlay
if base == WhiteoutOpaqueDir {
if err := syscall.Setxattr(dir, "trusted.overlay.opaque", []byte{'y'}, 0); err != nil {
return false, err
}
// don't write the file itself
return false, nil
}
// if a file was deleted and we are using overlay, we need to create a character device
if strings.HasPrefix(base, WhiteoutPrefix) {
originalBase := base[len(WhiteoutPrefix):]
originalPath := filepath.Join(dir, originalBase)
if err := syscall.Mknod(originalPath, syscall.S_IFCHR, 0); err != nil {
return false, err
}
if err := os.Chown(originalPath, hdr.Uid, hdr.Gid); err != nil {
return false, err
}
// don't write the file itself
return false, nil
}
return true, nil
}

7
vendor/github.com/containers/storage/pkg/archive/archive_other.go generated vendored Normal file
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// +build !linux
package archive
func getWhiteoutConverter(format WhiteoutFormat) tarWhiteoutConverter {
return nil
}

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// +build !windows
package archive
import (
"archive/tar"
"errors"
"os"
"path/filepath"
"syscall"
"github.com/containers/storage/pkg/system"
)
// fixVolumePathPrefix does platform specific processing to ensure that if
// the path being passed in is not in a volume path format, convert it to one.
func fixVolumePathPrefix(srcPath string) string {
return srcPath
}
// getWalkRoot calculates the root path when performing a TarWithOptions.
// We use a separate function as this is platform specific. On Linux, we
// can't use filepath.Join(srcPath,include) because this will clean away
// a trailing "." or "/" which may be important.
func getWalkRoot(srcPath string, include string) string {
return srcPath + string(filepath.Separator) + include
}
// CanonicalTarNameForPath returns platform-specific filepath
// to canonical posix-style path for tar archival. p is relative
// path.
func CanonicalTarNameForPath(p string) (string, error) {
return p, nil // already unix-style
}
// chmodTarEntry is used to adjust the file permissions used in tar header based
// on the platform the archival is done.
func chmodTarEntry(perm os.FileMode) os.FileMode {
return perm // noop for unix as golang APIs provide perm bits correctly
}
func setHeaderForSpecialDevice(hdr *tar.Header, ta *tarAppender, name string, stat interface{}) (inode uint64, err error) {
s, ok := stat.(*syscall.Stat_t)
if !ok {
err = errors.New("cannot convert stat value to syscall.Stat_t")
return
}
inode = uint64(s.Ino)
// Currently go does not fill in the major/minors
if s.Mode&syscall.S_IFBLK != 0 ||
s.Mode&syscall.S_IFCHR != 0 {
hdr.Devmajor = int64(major(uint64(s.Rdev)))
hdr.Devminor = int64(minor(uint64(s.Rdev)))
}
return
}
func getFileUIDGID(stat interface{}) (int, int, error) {
s, ok := stat.(*syscall.Stat_t)
if !ok {
return -1, -1, errors.New("cannot convert stat value to syscall.Stat_t")
}
return int(s.Uid), int(s.Gid), nil
}
func major(device uint64) uint64 {
return (device >> 8) & 0xfff
}
func minor(device uint64) uint64 {
return (device & 0xff) | ((device >> 12) & 0xfff00)
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo
func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
mode := uint32(hdr.Mode & 07777)
switch hdr.Typeflag {
case tar.TypeBlock:
mode |= syscall.S_IFBLK
case tar.TypeChar:
mode |= syscall.S_IFCHR
case tar.TypeFifo:
mode |= syscall.S_IFIFO
}
if err := system.Mknod(path, mode, int(system.Mkdev(hdr.Devmajor, hdr.Devminor))); err != nil {
return err
}
return nil
}
func handleLChmod(hdr *tar.Header, path string, hdrInfo os.FileInfo) error {
if hdr.Typeflag == tar.TypeLink {
if fi, err := os.Lstat(hdr.Linkname); err == nil && (fi.Mode()&os.ModeSymlink == 0) {
if err := os.Chmod(path, hdrInfo.Mode()); err != nil {
return err
}
}
} else if hdr.Typeflag != tar.TypeSymlink {
if err := os.Chmod(path, hdrInfo.Mode()); err != nil {
return err
}
}
return nil
}

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vendor/github.com/containers/storage/pkg/archive/archive_windows.go generated vendored Normal file
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// +build windows
package archive
import (
"archive/tar"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/containers/storage/pkg/longpath"
)
// fixVolumePathPrefix does platform specific processing to ensure that if
// the path being passed in is not in a volume path format, convert it to one.
func fixVolumePathPrefix(srcPath string) string {
return longpath.AddPrefix(srcPath)
}
// getWalkRoot calculates the root path when performing a TarWithOptions.
// We use a separate function as this is platform specific.
func getWalkRoot(srcPath string, include string) string {
return filepath.Join(srcPath, include)
}
// CanonicalTarNameForPath returns platform-specific filepath
// to canonical posix-style path for tar archival. p is relative
// path.
func CanonicalTarNameForPath(p string) (string, error) {
// windows: convert windows style relative path with backslashes
// into forward slashes. Since windows does not allow '/' or '\'
// in file names, it is mostly safe to replace however we must
// check just in case
if strings.Contains(p, "/") {
return "", fmt.Errorf("Windows path contains forward slash: %s", p)
}
return strings.Replace(p, string(os.PathSeparator), "/", -1), nil
}
// chmodTarEntry is used to adjust the file permissions used in tar header based
// on the platform the archival is done.
func chmodTarEntry(perm os.FileMode) os.FileMode {
perm &= 0755
// Add the x bit: make everything +x from windows
perm |= 0111
return perm
}
func setHeaderForSpecialDevice(hdr *tar.Header, ta *tarAppender, name string, stat interface{}) (inode uint64, err error) {
// do nothing. no notion of Rdev, Inode, Nlink in stat on Windows
return
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo
func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
return nil
}
func handleLChmod(hdr *tar.Header, path string, hdrInfo os.FileInfo) error {
return nil
}
func getFileUIDGID(stat interface{}) (int, int, error) {
// no notion of file ownership mapping yet on Windows
return 0, 0, nil
}

446
vendor/github.com/containers/storage/pkg/archive/changes.go generated vendored Normal file
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package archive
import (
"archive/tar"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strings"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/pools"
"github.com/containers/storage/pkg/system"
)
// ChangeType represents the change type.
type ChangeType int
const (
// ChangeModify represents the modify operation.
ChangeModify = iota
// ChangeAdd represents the add operation.
ChangeAdd
// ChangeDelete represents the delete operation.
ChangeDelete
)
func (c ChangeType) String() string {
switch c {
case ChangeModify:
return "C"
case ChangeAdd:
return "A"
case ChangeDelete:
return "D"
}
return ""
}
// Change represents a change, it wraps the change type and path.
// It describes changes of the files in the path respect to the
// parent layers. The change could be modify, add, delete.
// This is used for layer diff.
type Change struct {
Path string
Kind ChangeType
}
func (change *Change) String() string {
return fmt.Sprintf("%s %s", change.Kind, change.Path)
}
// for sort.Sort
type changesByPath []Change
func (c changesByPath) Less(i, j int) bool { return c[i].Path < c[j].Path }
func (c changesByPath) Len() int { return len(c) }
func (c changesByPath) Swap(i, j int) { c[j], c[i] = c[i], c[j] }
// Gnu tar and the go tar writer don't have sub-second mtime
// precision, which is problematic when we apply changes via tar
// files, we handle this by comparing for exact times, *or* same
// second count and either a or b having exactly 0 nanoseconds
func sameFsTime(a, b time.Time) bool {
return a == b ||
(a.Unix() == b.Unix() &&
(a.Nanosecond() == 0 || b.Nanosecond() == 0))
}
func sameFsTimeSpec(a, b syscall.Timespec) bool {
return a.Sec == b.Sec &&
(a.Nsec == b.Nsec || a.Nsec == 0 || b.Nsec == 0)
}
// Changes walks the path rw and determines changes for the files in the path,
// with respect to the parent layers
func Changes(layers []string, rw string) ([]Change, error) {
return changes(layers, rw, aufsDeletedFile, aufsMetadataSkip)
}
func aufsMetadataSkip(path string) (skip bool, err error) {
skip, err = filepath.Match(string(os.PathSeparator)+WhiteoutMetaPrefix+"*", path)
if err != nil {
skip = true
}
return
}
func aufsDeletedFile(root, path string, fi os.FileInfo) (string, error) {
f := filepath.Base(path)
// If there is a whiteout, then the file was removed
if strings.HasPrefix(f, WhiteoutPrefix) {
originalFile := f[len(WhiteoutPrefix):]
return filepath.Join(filepath.Dir(path), originalFile), nil
}
return "", nil
}
type skipChange func(string) (bool, error)
type deleteChange func(string, string, os.FileInfo) (string, error)
func changes(layers []string, rw string, dc deleteChange, sc skipChange) ([]Change, error) {
var (
changes []Change
changedDirs = make(map[string]struct{})
)
err := filepath.Walk(rw, func(path string, f os.FileInfo, err error) error {
if err != nil {
return err
}
// Rebase path
path, err = filepath.Rel(rw, path)
if err != nil {
return err
}
// As this runs on the daemon side, file paths are OS specific.
path = filepath.Join(string(os.PathSeparator), path)
// Skip root
if path == string(os.PathSeparator) {
return nil
}
if sc != nil {
if skip, err := sc(path); skip {
return err
}
}
change := Change{
Path: path,
}
deletedFile, err := dc(rw, path, f)
if err != nil {
return err
}
// Find out what kind of modification happened
if deletedFile != "" {
change.Path = deletedFile
change.Kind = ChangeDelete
} else {
// Otherwise, the file was added
change.Kind = ChangeAdd
// ...Unless it already existed in a top layer, in which case, it's a modification
for _, layer := range layers {
stat, err := os.Stat(filepath.Join(layer, path))
if err != nil && !os.IsNotExist(err) {
return err
}
if err == nil {
// The file existed in the top layer, so that's a modification
// However, if it's a directory, maybe it wasn't actually modified.
// If you modify /foo/bar/baz, then /foo will be part of the changed files only because it's the parent of bar
if stat.IsDir() && f.IsDir() {
if f.Size() == stat.Size() && f.Mode() == stat.Mode() && sameFsTime(f.ModTime(), stat.ModTime()) {
// Both directories are the same, don't record the change
return nil
}
}
change.Kind = ChangeModify
break
}
}
}
// If /foo/bar/file.txt is modified, then /foo/bar must be part of the changed files.
// This block is here to ensure the change is recorded even if the
// modify time, mode and size of the parent directory in the rw and ro layers are all equal.
// Check https://github.com/docker/docker/pull/13590 for details.
if f.IsDir() {
changedDirs[path] = struct{}{}
}
if change.Kind == ChangeAdd || change.Kind == ChangeDelete {
parent := filepath.Dir(path)
if _, ok := changedDirs[parent]; !ok && parent != "/" {
changes = append(changes, Change{Path: parent, Kind: ChangeModify})
changedDirs[parent] = struct{}{}
}
}
// Record change
changes = append(changes, change)
return nil
})
if err != nil && !os.IsNotExist(err) {
return nil, err
}
return changes, nil
}
// FileInfo describes the information of a file.
type FileInfo struct {
parent *FileInfo
name string
stat *system.StatT
children map[string]*FileInfo
capability []byte
added bool
}
// LookUp looks up the file information of a file.
func (info *FileInfo) LookUp(path string) *FileInfo {
// As this runs on the daemon side, file paths are OS specific.
parent := info
if path == string(os.PathSeparator) {
return info
}
pathElements := strings.Split(path, string(os.PathSeparator))
for _, elem := range pathElements {
if elem != "" {
child := parent.children[elem]
if child == nil {
return nil
}
parent = child
}
}
return parent
}
func (info *FileInfo) path() string {
if info.parent == nil {
// As this runs on the daemon side, file paths are OS specific.
return string(os.PathSeparator)
}
return filepath.Join(info.parent.path(), info.name)
}
func (info *FileInfo) addChanges(oldInfo *FileInfo, changes *[]Change) {
sizeAtEntry := len(*changes)
if oldInfo == nil {
// add
change := Change{
Path: info.path(),
Kind: ChangeAdd,
}
*changes = append(*changes, change)
info.added = true
}
// We make a copy so we can modify it to detect additions
// also, we only recurse on the old dir if the new info is a directory
// otherwise any previous delete/change is considered recursive
oldChildren := make(map[string]*FileInfo)
if oldInfo != nil && info.isDir() {
for k, v := range oldInfo.children {
oldChildren[k] = v
}
}
for name, newChild := range info.children {
oldChild, _ := oldChildren[name]
if oldChild != nil {
// change?
oldStat := oldChild.stat
newStat := newChild.stat
// Note: We can't compare inode or ctime or blocksize here, because these change
// when copying a file into a container. However, that is not generally a problem
// because any content change will change mtime, and any status change should
// be visible when actually comparing the stat fields. The only time this
// breaks down is if some code intentionally hides a change by setting
// back mtime
if statDifferent(oldStat, newStat) ||
bytes.Compare(oldChild.capability, newChild.capability) != 0 {
change := Change{
Path: newChild.path(),
Kind: ChangeModify,
}
*changes = append(*changes, change)
newChild.added = true
}
// Remove from copy so we can detect deletions
delete(oldChildren, name)
}
newChild.addChanges(oldChild, changes)
}
for _, oldChild := range oldChildren {
// delete
change := Change{
Path: oldChild.path(),
Kind: ChangeDelete,
}
*changes = append(*changes, change)
}
// If there were changes inside this directory, we need to add it, even if the directory
// itself wasn't changed. This is needed to properly save and restore filesystem permissions.
// As this runs on the daemon side, file paths are OS specific.
if len(*changes) > sizeAtEntry && info.isDir() && !info.added && info.path() != string(os.PathSeparator) {
change := Change{
Path: info.path(),
Kind: ChangeModify,
}
// Let's insert the directory entry before the recently added entries located inside this dir
*changes = append(*changes, change) // just to resize the slice, will be overwritten
copy((*changes)[sizeAtEntry+1:], (*changes)[sizeAtEntry:])
(*changes)[sizeAtEntry] = change
}
}
// Changes add changes to file information.
func (info *FileInfo) Changes(oldInfo *FileInfo) []Change {
var changes []Change
info.addChanges(oldInfo, &changes)
return changes
}
func newRootFileInfo() *FileInfo {
// As this runs on the daemon side, file paths are OS specific.
root := &FileInfo{
name: string(os.PathSeparator),
children: make(map[string]*FileInfo),
}
return root
}
// ChangesDirs compares two directories and generates an array of Change objects describing the changes.
// If oldDir is "", then all files in newDir will be Add-Changes.
func ChangesDirs(newDir, oldDir string) ([]Change, error) {
var (
oldRoot, newRoot *FileInfo
)
if oldDir == "" {
emptyDir, err := ioutil.TempDir("", "empty")
if err != nil {
return nil, err
}
defer os.Remove(emptyDir)
oldDir = emptyDir
}
oldRoot, newRoot, err := collectFileInfoForChanges(oldDir, newDir)
if err != nil {
return nil, err
}
return newRoot.Changes(oldRoot), nil
}
// ChangesSize calculates the size in bytes of the provided changes, based on newDir.
func ChangesSize(newDir string, changes []Change) int64 {
var (
size int64
sf = make(map[uint64]struct{})
)
for _, change := range changes {
if change.Kind == ChangeModify || change.Kind == ChangeAdd {
file := filepath.Join(newDir, change.Path)
fileInfo, err := os.Lstat(file)
if err != nil {
logrus.Errorf("Can not stat %q: %s", file, err)
continue
}
if fileInfo != nil && !fileInfo.IsDir() {
if hasHardlinks(fileInfo) {
inode := getIno(fileInfo)
if _, ok := sf[inode]; !ok {
size += fileInfo.Size()
sf[inode] = struct{}{}
}
} else {
size += fileInfo.Size()
}
}
}
}
return size
}
// ExportChanges produces an Archive from the provided changes, relative to dir.
func ExportChanges(dir string, changes []Change, uidMaps, gidMaps []idtools.IDMap) (Archive, error) {
reader, writer := io.Pipe()
go func() {
ta := &tarAppender{
TarWriter: tar.NewWriter(writer),
Buffer: pools.BufioWriter32KPool.Get(nil),
SeenFiles: make(map[uint64]string),
UIDMaps: uidMaps,
GIDMaps: gidMaps,
}
// this buffer is needed for the duration of this piped stream
defer pools.BufioWriter32KPool.Put(ta.Buffer)
sort.Sort(changesByPath(changes))
// In general we log errors here but ignore them because
// during e.g. a diff operation the container can continue
// mutating the filesystem and we can see transient errors
// from this
for _, change := range changes {
if change.Kind == ChangeDelete {
whiteOutDir := filepath.Dir(change.Path)
whiteOutBase := filepath.Base(change.Path)
whiteOut := filepath.Join(whiteOutDir, WhiteoutPrefix+whiteOutBase)
timestamp := time.Now()
hdr := &tar.Header{
Name: whiteOut[1:],
Size: 0,
ModTime: timestamp,
AccessTime: timestamp,
ChangeTime: timestamp,
}
if err := ta.TarWriter.WriteHeader(hdr); err != nil {
logrus.Debugf("Can't write whiteout header: %s", err)
}
} else {
path := filepath.Join(dir, change.Path)
if err := ta.addTarFile(path, change.Path[1:]); err != nil {
logrus.Debugf("Can't add file %s to tar: %s", path, err)
}
}
}
// Make sure to check the error on Close.
if err := ta.TarWriter.Close(); err != nil {
logrus.Debugf("Can't close layer: %s", err)
}
if err := writer.Close(); err != nil {
logrus.Debugf("failed close Changes writer: %s", err)
}
}()
return reader, nil
}

312
vendor/github.com/containers/storage/pkg/archive/changes_linux.go generated vendored Normal file
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package archive
import (
"bytes"
"fmt"
"os"
"path/filepath"
"sort"
"syscall"
"unsafe"
"github.com/containers/storage/pkg/system"
)
// walker is used to implement collectFileInfoForChanges on linux. Where this
// method in general returns the entire contents of two directory trees, we
// optimize some FS calls out on linux. In particular, we take advantage of the
// fact that getdents(2) returns the inode of each file in the directory being
// walked, which, when walking two trees in parallel to generate a list of
// changes, can be used to prune subtrees without ever having to lstat(2) them
// directly. Eliminating stat calls in this way can save up to seconds on large
// images.
type walker struct {
dir1 string
dir2 string
root1 *FileInfo
root2 *FileInfo
}
// collectFileInfoForChanges returns a complete representation of the trees
// rooted at dir1 and dir2, with one important exception: any subtree or
// leaf where the inode and device numbers are an exact match between dir1
// and dir2 will be pruned from the results. This method is *only* to be used
// to generating a list of changes between the two directories, as it does not
// reflect the full contents.
func collectFileInfoForChanges(dir1, dir2 string) (*FileInfo, *FileInfo, error) {
w := &walker{
dir1: dir1,
dir2: dir2,
root1: newRootFileInfo(),
root2: newRootFileInfo(),
}
i1, err := os.Lstat(w.dir1)
if err != nil {
return nil, nil, err
}
i2, err := os.Lstat(w.dir2)
if err != nil {
return nil, nil, err
}
if err := w.walk("/", i1, i2); err != nil {
return nil, nil, err
}
return w.root1, w.root2, nil
}
// Given a FileInfo, its path info, and a reference to the root of the tree
// being constructed, register this file with the tree.
func walkchunk(path string, fi os.FileInfo, dir string, root *FileInfo) error {
if fi == nil {
return nil
}
parent := root.LookUp(filepath.Dir(path))
if parent == nil {
return fmt.Errorf("collectFileInfoForChanges: Unexpectedly no parent for %s", path)
}
info := &FileInfo{
name: filepath.Base(path),
children: make(map[string]*FileInfo),
parent: parent,
}
cpath := filepath.Join(dir, path)
stat, err := system.FromStatT(fi.Sys().(*syscall.Stat_t))
if err != nil {
return err
}
info.stat = stat
info.capability, _ = system.Lgetxattr(cpath, "security.capability") // lgetxattr(2): fs access
parent.children[info.name] = info
return nil
}
// Walk a subtree rooted at the same path in both trees being iterated. For
// example, /docker/overlay/1234/a/b/c/d and /docker/overlay/8888/a/b/c/d
func (w *walker) walk(path string, i1, i2 os.FileInfo) (err error) {
// Register these nodes with the return trees, unless we're still at the
// (already-created) roots:
if path != "/" {
if err := walkchunk(path, i1, w.dir1, w.root1); err != nil {
return err
}
if err := walkchunk(path, i2, w.dir2, w.root2); err != nil {
return err
}
}
is1Dir := i1 != nil && i1.IsDir()
is2Dir := i2 != nil && i2.IsDir()
sameDevice := false
if i1 != nil && i2 != nil {
si1 := i1.Sys().(*syscall.Stat_t)
si2 := i2.Sys().(*syscall.Stat_t)
if si1.Dev == si2.Dev {
sameDevice = true
}
}
// If these files are both non-existent, or leaves (non-dirs), we are done.
if !is1Dir && !is2Dir {
return nil
}
// Fetch the names of all the files contained in both directories being walked:
var names1, names2 []nameIno
if is1Dir {
names1, err = readdirnames(filepath.Join(w.dir1, path)) // getdents(2): fs access
if err != nil {
return err
}
}
if is2Dir {
names2, err = readdirnames(filepath.Join(w.dir2, path)) // getdents(2): fs access
if err != nil {
return err
}
}
// We have lists of the files contained in both parallel directories, sorted
// in the same order. Walk them in parallel, generating a unique merged list
// of all items present in either or both directories.
var names []string
ix1 := 0
ix2 := 0
for {
if ix1 >= len(names1) {
break
}
if ix2 >= len(names2) {
break
}
ni1 := names1[ix1]
ni2 := names2[ix2]
switch bytes.Compare([]byte(ni1.name), []byte(ni2.name)) {
case -1: // ni1 < ni2 -- advance ni1
// we will not encounter ni1 in names2
names = append(names, ni1.name)
ix1++
case 0: // ni1 == ni2
if ni1.ino != ni2.ino || !sameDevice {
names = append(names, ni1.name)
}
ix1++
ix2++
case 1: // ni1 > ni2 -- advance ni2
// we will not encounter ni2 in names1
names = append(names, ni2.name)
ix2++
}
}
for ix1 < len(names1) {
names = append(names, names1[ix1].name)
ix1++
}
for ix2 < len(names2) {
names = append(names, names2[ix2].name)
ix2++
}
// For each of the names present in either or both of the directories being
// iterated, stat the name under each root, and recurse the pair of them:
for _, name := range names {
fname := filepath.Join(path, name)
var cInfo1, cInfo2 os.FileInfo
if is1Dir {
cInfo1, err = os.Lstat(filepath.Join(w.dir1, fname)) // lstat(2): fs access
if err != nil && !os.IsNotExist(err) {
return err
}
}
if is2Dir {
cInfo2, err = os.Lstat(filepath.Join(w.dir2, fname)) // lstat(2): fs access
if err != nil && !os.IsNotExist(err) {
return err
}
}
if err = w.walk(fname, cInfo1, cInfo2); err != nil {
return err
}
}
return nil
}
// {name,inode} pairs used to support the early-pruning logic of the walker type
type nameIno struct {
name string
ino uint64
}
type nameInoSlice []nameIno
func (s nameInoSlice) Len() int { return len(s) }
func (s nameInoSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s nameInoSlice) Less(i, j int) bool { return s[i].name < s[j].name }
// readdirnames is a hacked-apart version of the Go stdlib code, exposing inode
// numbers further up the stack when reading directory contents. Unlike
// os.Readdirnames, which returns a list of filenames, this function returns a
// list of {filename,inode} pairs.
func readdirnames(dirname string) (names []nameIno, err error) {
var (
size = 100
buf = make([]byte, 4096)
nbuf int
bufp int
nb int
)
f, err := os.Open(dirname)
if err != nil {
return nil, err
}
defer f.Close()
names = make([]nameIno, 0, size) // Empty with room to grow.
for {
// Refill the buffer if necessary
if bufp >= nbuf {
bufp = 0
nbuf, err = syscall.ReadDirent(int(f.Fd()), buf) // getdents on linux
if nbuf < 0 {
nbuf = 0
}
if err != nil {
return nil, os.NewSyscallError("readdirent", err)
}
if nbuf <= 0 {
break // EOF
}
}
// Drain the buffer
nb, names = parseDirent(buf[bufp:nbuf], names)
bufp += nb
}
sl := nameInoSlice(names)
sort.Sort(sl)
return sl, nil
}
// parseDirent is a minor modification of syscall.ParseDirent (linux version)
// which returns {name,inode} pairs instead of just names.
func parseDirent(buf []byte, names []nameIno) (consumed int, newnames []nameIno) {
origlen := len(buf)
for len(buf) > 0 {
dirent := (*syscall.Dirent)(unsafe.Pointer(&buf[0]))
buf = buf[dirent.Reclen:]
if dirent.Ino == 0 { // File absent in directory.
continue
}
bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
var name = string(bytes[0:clen(bytes[:])])
if name == "." || name == ".." { // Useless names
continue
}
names = append(names, nameIno{name, dirent.Ino})
}
return origlen - len(buf), names
}
func clen(n []byte) int {
for i := 0; i < len(n); i++ {
if n[i] == 0 {
return i
}
}
return len(n)
}
// OverlayChanges walks the path rw and determines changes for the files in the path,
// with respect to the parent layers
func OverlayChanges(layers []string, rw string) ([]Change, error) {
return changes(layers, rw, overlayDeletedFile, nil)
}
func overlayDeletedFile(root, path string, fi os.FileInfo) (string, error) {
if fi.Mode()&os.ModeCharDevice != 0 {
s := fi.Sys().(*syscall.Stat_t)
if major(uint64(s.Rdev)) == 0 && minor(uint64(s.Rdev)) == 0 {
return path, nil
}
}
if fi.Mode()&os.ModeDir != 0 {
opaque, err := system.Lgetxattr(filepath.Join(root, path), "trusted.overlay.opaque")
if err != nil {
return "", err
}
if opaque != nil && len(opaque) == 1 && opaque[0] == 'y' {
return path, nil
}
}
return "", nil
}

97
vendor/github.com/containers/storage/pkg/archive/changes_other.go generated vendored Normal file
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// +build !linux
package archive
import (
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
"github.com/containers/storage/pkg/system"
)
func collectFileInfoForChanges(oldDir, newDir string) (*FileInfo, *FileInfo, error) {
var (
oldRoot, newRoot *FileInfo
err1, err2 error
errs = make(chan error, 2)
)
go func() {
oldRoot, err1 = collectFileInfo(oldDir)
errs <- err1
}()
go func() {
newRoot, err2 = collectFileInfo(newDir)
errs <- err2
}()
// block until both routines have returned
for i := 0; i < 2; i++ {
if err := <-errs; err != nil {
return nil, nil, err
}
}
return oldRoot, newRoot, nil
}
func collectFileInfo(sourceDir string) (*FileInfo, error) {
root := newRootFileInfo()
err := filepath.Walk(sourceDir, func(path string, f os.FileInfo, err error) error {
if err != nil {
return err
}
// Rebase path
relPath, err := filepath.Rel(sourceDir, path)
if err != nil {
return err
}
// As this runs on the daemon side, file paths are OS specific.
relPath = filepath.Join(string(os.PathSeparator), relPath)
// See https://github.com/golang/go/issues/9168 - bug in filepath.Join.
// Temporary workaround. If the returned path starts with two backslashes,
// trim it down to a single backslash. Only relevant on Windows.
if runtime.GOOS == "windows" {
if strings.HasPrefix(relPath, `\\`) {
relPath = relPath[1:]
}
}
if relPath == string(os.PathSeparator) {
return nil
}
parent := root.LookUp(filepath.Dir(relPath))
if parent == nil {
return fmt.Errorf("collectFileInfo: Unexpectedly no parent for %s", relPath)
}
info := &FileInfo{
name: filepath.Base(relPath),
children: make(map[string]*FileInfo),
parent: parent,
}
s, err := system.Lstat(path)
if err != nil {
return err
}
info.stat = s
info.capability, _ = system.Lgetxattr(path, "security.capability")
parent.children[info.name] = info
return nil
})
if err != nil {
return nil, err
}
return root, nil
}

36
vendor/github.com/containers/storage/pkg/archive/changes_unix.go generated vendored Normal file
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@ -0,0 +1,36 @@
// +build !windows
package archive
import (
"os"
"syscall"
"github.com/containers/storage/pkg/system"
)
func statDifferent(oldStat *system.StatT, newStat *system.StatT) bool {
// Don't look at size for dirs, its not a good measure of change
if oldStat.Mode() != newStat.Mode() ||
oldStat.UID() != newStat.UID() ||
oldStat.GID() != newStat.GID() ||
oldStat.Rdev() != newStat.Rdev() ||
// Don't look at size for dirs, its not a good measure of change
(oldStat.Mode()&syscall.S_IFDIR != syscall.S_IFDIR &&
(!sameFsTimeSpec(oldStat.Mtim(), newStat.Mtim()) || (oldStat.Size() != newStat.Size()))) {
return true
}
return false
}
func (info *FileInfo) isDir() bool {
return info.parent == nil || info.stat.Mode()&syscall.S_IFDIR != 0
}
func getIno(fi os.FileInfo) uint64 {
return uint64(fi.Sys().(*syscall.Stat_t).Ino)
}
func hasHardlinks(fi os.FileInfo) bool {
return fi.Sys().(*syscall.Stat_t).Nlink > 1
}

30
vendor/github.com/containers/storage/pkg/archive/changes_windows.go generated vendored Normal file
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@ -0,0 +1,30 @@
package archive
import (
"os"
"github.com/containers/storage/pkg/system"
)
func statDifferent(oldStat *system.StatT, newStat *system.StatT) bool {
// Don't look at size for dirs, its not a good measure of change
if oldStat.ModTime() != newStat.ModTime() ||
oldStat.Mode() != newStat.Mode() ||
oldStat.Size() != newStat.Size() && !oldStat.IsDir() {
return true
}
return false
}
func (info *FileInfo) isDir() bool {
return info.parent == nil || info.stat.IsDir()
}
func getIno(fi os.FileInfo) (inode uint64) {
return
}
func hasHardlinks(fi os.FileInfo) bool {
return false
}

458
vendor/github.com/containers/storage/pkg/archive/copy.go generated vendored Normal file
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@ -0,0 +1,458 @@
package archive
import (
"archive/tar"
"errors"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/pkg/system"
)
// Errors used or returned by this file.
var (
ErrNotDirectory = errors.New("not a directory")
ErrDirNotExists = errors.New("no such directory")
ErrCannotCopyDir = errors.New("cannot copy directory")
ErrInvalidCopySource = errors.New("invalid copy source content")
)
// PreserveTrailingDotOrSeparator returns the given cleaned path (after
// processing using any utility functions from the path or filepath stdlib
// packages) and appends a trailing `/.` or `/` if its corresponding original
// path (from before being processed by utility functions from the path or
// filepath stdlib packages) ends with a trailing `/.` or `/`. If the cleaned
// path already ends in a `.` path segment, then another is not added. If the
// clean path already ends in a path separator, then another is not added.
func PreserveTrailingDotOrSeparator(cleanedPath, originalPath string) string {
// Ensure paths are in platform semantics
cleanedPath = normalizePath(cleanedPath)
originalPath = normalizePath(originalPath)
if !specifiesCurrentDir(cleanedPath) && specifiesCurrentDir(originalPath) {
if !hasTrailingPathSeparator(cleanedPath) {
// Add a separator if it doesn't already end with one (a cleaned
// path would only end in a separator if it is the root).
cleanedPath += string(filepath.Separator)
}
cleanedPath += "."
}
if !hasTrailingPathSeparator(cleanedPath) && hasTrailingPathSeparator(originalPath) {
cleanedPath += string(filepath.Separator)
}
return cleanedPath
}
// assertsDirectory returns whether the given path is
// asserted to be a directory, i.e., the path ends with
// a trailing '/' or `/.`, assuming a path separator of `/`.
func assertsDirectory(path string) bool {
return hasTrailingPathSeparator(path) || specifiesCurrentDir(path)
}
// hasTrailingPathSeparator returns whether the given
// path ends with the system's path separator character.
func hasTrailingPathSeparator(path string) bool {
return len(path) > 0 && os.IsPathSeparator(path[len(path)-1])
}
// specifiesCurrentDir returns whether the given path specifies
// a "current directory", i.e., the last path segment is `.`.
func specifiesCurrentDir(path string) bool {
return filepath.Base(path) == "."
}
// SplitPathDirEntry splits the given path between its directory name and its
// basename by first cleaning the path but preserves a trailing "." if the
// original path specified the current directory.
func SplitPathDirEntry(path string) (dir, base string) {
cleanedPath := filepath.Clean(normalizePath(path))
if specifiesCurrentDir(path) {
cleanedPath += string(filepath.Separator) + "."
}
return filepath.Dir(cleanedPath), filepath.Base(cleanedPath)
}
// TarResource archives the resource described by the given CopyInfo to a Tar
// archive. A non-nil error is returned if sourcePath does not exist or is
// asserted to be a directory but exists as another type of file.
//
// This function acts as a convenient wrapper around TarWithOptions, which
// requires a directory as the source path. TarResource accepts either a
// directory or a file path and correctly sets the Tar options.
func TarResource(sourceInfo CopyInfo) (content Archive, err error) {
return TarResourceRebase(sourceInfo.Path, sourceInfo.RebaseName)
}
// TarResourceRebase is like TarResource but renames the first path element of
// items in the resulting tar archive to match the given rebaseName if not "".
func TarResourceRebase(sourcePath, rebaseName string) (content Archive, err error) {
sourcePath = normalizePath(sourcePath)
if _, err = os.Lstat(sourcePath); err != nil {
// Catches the case where the source does not exist or is not a
// directory if asserted to be a directory, as this also causes an
// error.
return
}
// Separate the source path between it's directory and
// the entry in that directory which we are archiving.
sourceDir, sourceBase := SplitPathDirEntry(sourcePath)
filter := []string{sourceBase}
logrus.Debugf("copying %q from %q", sourceBase, sourceDir)
return TarWithOptions(sourceDir, &TarOptions{
Compression: Uncompressed,
IncludeFiles: filter,
IncludeSourceDir: true,
RebaseNames: map[string]string{
sourceBase: rebaseName,
},
})
}
// CopyInfo holds basic info about the source
// or destination path of a copy operation.
type CopyInfo struct {
Path string
Exists bool
IsDir bool
RebaseName string
}
// CopyInfoSourcePath stats the given path to create a CopyInfo
// struct representing that resource for the source of an archive copy
// operation. The given path should be an absolute local path. A source path
// has all symlinks evaluated that appear before the last path separator ("/"
// on Unix). As it is to be a copy source, the path must exist.
func CopyInfoSourcePath(path string, followLink bool) (CopyInfo, error) {
// normalize the file path and then evaluate the symbol link
// we will use the target file instead of the symbol link if
// followLink is set
path = normalizePath(path)
resolvedPath, rebaseName, err := ResolveHostSourcePath(path, followLink)
if err != nil {
return CopyInfo{}, err
}
stat, err := os.Lstat(resolvedPath)
if err != nil {
return CopyInfo{}, err
}
return CopyInfo{
Path: resolvedPath,
Exists: true,
IsDir: stat.IsDir(),
RebaseName: rebaseName,
}, nil
}
// CopyInfoDestinationPath stats the given path to create a CopyInfo
// struct representing that resource for the destination of an archive copy
// operation. The given path should be an absolute local path.
func CopyInfoDestinationPath(path string) (info CopyInfo, err error) {
maxSymlinkIter := 10 // filepath.EvalSymlinks uses 255, but 10 already seems like a lot.
path = normalizePath(path)
originalPath := path
stat, err := os.Lstat(path)
if err == nil && stat.Mode()&os.ModeSymlink == 0 {
// The path exists and is not a symlink.
return CopyInfo{
Path: path,
Exists: true,
IsDir: stat.IsDir(),
}, nil
}
// While the path is a symlink.
for n := 0; err == nil && stat.Mode()&os.ModeSymlink != 0; n++ {
if n > maxSymlinkIter {
// Don't follow symlinks more than this arbitrary number of times.
return CopyInfo{}, errors.New("too many symlinks in " + originalPath)
}
// The path is a symbolic link. We need to evaluate it so that the
// destination of the copy operation is the link target and not the
// link itself. This is notably different than CopyInfoSourcePath which
// only evaluates symlinks before the last appearing path separator.
// Also note that it is okay if the last path element is a broken
// symlink as the copy operation should create the target.
var linkTarget string
linkTarget, err = os.Readlink(path)
if err != nil {
return CopyInfo{}, err
}
if !system.IsAbs(linkTarget) {
// Join with the parent directory.
dstParent, _ := SplitPathDirEntry(path)
linkTarget = filepath.Join(dstParent, linkTarget)
}
path = linkTarget
stat, err = os.Lstat(path)
}
if err != nil {
// It's okay if the destination path doesn't exist. We can still
// continue the copy operation if the parent directory exists.
if !os.IsNotExist(err) {
return CopyInfo{}, err
}
// Ensure destination parent dir exists.
dstParent, _ := SplitPathDirEntry(path)
parentDirStat, err := os.Lstat(dstParent)
if err != nil {
return CopyInfo{}, err
}
if !parentDirStat.IsDir() {
return CopyInfo{}, ErrNotDirectory
}
return CopyInfo{Path: path}, nil
}
// The path exists after resolving symlinks.
return CopyInfo{
Path: path,
Exists: true,
IsDir: stat.IsDir(),
}, nil
}
// PrepareArchiveCopy prepares the given srcContent archive, which should
// contain the archived resource described by srcInfo, to the destination
// described by dstInfo. Returns the possibly modified content archive along
// with the path to the destination directory which it should be extracted to.
func PrepareArchiveCopy(srcContent Reader, srcInfo, dstInfo CopyInfo) (dstDir string, content Archive, err error) {
// Ensure in platform semantics
srcInfo.Path = normalizePath(srcInfo.Path)
dstInfo.Path = normalizePath(dstInfo.Path)
// Separate the destination path between its directory and base
// components in case the source archive contents need to be rebased.
dstDir, dstBase := SplitPathDirEntry(dstInfo.Path)
_, srcBase := SplitPathDirEntry(srcInfo.Path)
switch {
case dstInfo.Exists && dstInfo.IsDir:
// The destination exists as a directory. No alteration
// to srcContent is needed as its contents can be
// simply extracted to the destination directory.
return dstInfo.Path, ioutil.NopCloser(srcContent), nil
case dstInfo.Exists && srcInfo.IsDir:
// The destination exists as some type of file and the source
// content is a directory. This is an error condition since
// you cannot copy a directory to an existing file location.
return "", nil, ErrCannotCopyDir
case dstInfo.Exists:
// The destination exists as some type of file and the source content
// is also a file. The source content entry will have to be renamed to
// have a basename which matches the destination path's basename.
if len(srcInfo.RebaseName) != 0 {
srcBase = srcInfo.RebaseName
}
return dstDir, RebaseArchiveEntries(srcContent, srcBase, dstBase), nil
case srcInfo.IsDir:
// The destination does not exist and the source content is an archive
// of a directory. The archive should be extracted to the parent of
// the destination path instead, and when it is, the directory that is
// created as a result should take the name of the destination path.
// The source content entries will have to be renamed to have a
// basename which matches the destination path's basename.
if len(srcInfo.RebaseName) != 0 {
srcBase = srcInfo.RebaseName
}
return dstDir, RebaseArchiveEntries(srcContent, srcBase, dstBase), nil
case assertsDirectory(dstInfo.Path):
// The destination does not exist and is asserted to be created as a
// directory, but the source content is not a directory. This is an
// error condition since you cannot create a directory from a file
// source.
return "", nil, ErrDirNotExists
default:
// The last remaining case is when the destination does not exist, is
// not asserted to be a directory, and the source content is not an
// archive of a directory. It this case, the destination file will need
// to be created when the archive is extracted and the source content
// entry will have to be renamed to have a basename which matches the
// destination path's basename.
if len(srcInfo.RebaseName) != 0 {
srcBase = srcInfo.RebaseName
}
return dstDir, RebaseArchiveEntries(srcContent, srcBase, dstBase), nil
}
}
// RebaseArchiveEntries rewrites the given srcContent archive replacing
// an occurrence of oldBase with newBase at the beginning of entry names.
func RebaseArchiveEntries(srcContent Reader, oldBase, newBase string) Archive {
if oldBase == string(os.PathSeparator) {
// If oldBase specifies the root directory, use an empty string as
// oldBase instead so that newBase doesn't replace the path separator
// that all paths will start with.
oldBase = ""
}
rebased, w := io.Pipe()
go func() {
srcTar := tar.NewReader(srcContent)
rebasedTar := tar.NewWriter(w)
for {
hdr, err := srcTar.Next()
if err == io.EOF {
// Signals end of archive.
rebasedTar.Close()
w.Close()
return
}
if err != nil {
w.CloseWithError(err)
return
}
hdr.Name = strings.Replace(hdr.Name, oldBase, newBase, 1)
if err = rebasedTar.WriteHeader(hdr); err != nil {
w.CloseWithError(err)
return
}
if _, err = io.Copy(rebasedTar, srcTar); err != nil {
w.CloseWithError(err)
return
}
}
}()
return rebased
}
// CopyResource performs an archive copy from the given source path to the
// given destination path. The source path MUST exist and the destination
// path's parent directory must exist.
func CopyResource(srcPath, dstPath string, followLink bool) error {
var (
srcInfo CopyInfo
err error
)
// Ensure in platform semantics
srcPath = normalizePath(srcPath)
dstPath = normalizePath(dstPath)
// Clean the source and destination paths.
srcPath = PreserveTrailingDotOrSeparator(filepath.Clean(srcPath), srcPath)
dstPath = PreserveTrailingDotOrSeparator(filepath.Clean(dstPath), dstPath)
if srcInfo, err = CopyInfoSourcePath(srcPath, followLink); err != nil {
return err
}
content, err := TarResource(srcInfo)
if err != nil {
return err
}
defer content.Close()
return CopyTo(content, srcInfo, dstPath)
}
// CopyTo handles extracting the given content whose
// entries should be sourced from srcInfo to dstPath.
func CopyTo(content Reader, srcInfo CopyInfo, dstPath string) error {
// The destination path need not exist, but CopyInfoDestinationPath will
// ensure that at least the parent directory exists.
dstInfo, err := CopyInfoDestinationPath(normalizePath(dstPath))
if err != nil {
return err
}
dstDir, copyArchive, err := PrepareArchiveCopy(content, srcInfo, dstInfo)
if err != nil {
return err
}
defer copyArchive.Close()
options := &TarOptions{
NoLchown: true,
NoOverwriteDirNonDir: true,
}
return Untar(copyArchive, dstDir, options)
}
// ResolveHostSourcePath decides real path need to be copied with parameters such as
// whether to follow symbol link or not, if followLink is true, resolvedPath will return
// link target of any symbol link file, else it will only resolve symlink of directory
// but return symbol link file itself without resolving.
func ResolveHostSourcePath(path string, followLink bool) (resolvedPath, rebaseName string, err error) {
if followLink {
resolvedPath, err = filepath.EvalSymlinks(path)
if err != nil {
return
}
resolvedPath, rebaseName = GetRebaseName(path, resolvedPath)
} else {
dirPath, basePath := filepath.Split(path)
// if not follow symbol link, then resolve symbol link of parent dir
var resolvedDirPath string
resolvedDirPath, err = filepath.EvalSymlinks(dirPath)
if err != nil {
return
}
// resolvedDirPath will have been cleaned (no trailing path separators) so
// we can manually join it with the base path element.
resolvedPath = resolvedDirPath + string(filepath.Separator) + basePath
if hasTrailingPathSeparator(path) && filepath.Base(path) != filepath.Base(resolvedPath) {
rebaseName = filepath.Base(path)
}
}
return resolvedPath, rebaseName, nil
}
// GetRebaseName normalizes and compares path and resolvedPath,
// return completed resolved path and rebased file name
func GetRebaseName(path, resolvedPath string) (string, string) {
// linkTarget will have been cleaned (no trailing path separators and dot) so
// we can manually join it with them
var rebaseName string
if specifiesCurrentDir(path) && !specifiesCurrentDir(resolvedPath) {
resolvedPath += string(filepath.Separator) + "."
}
if hasTrailingPathSeparator(path) && !hasTrailingPathSeparator(resolvedPath) {
resolvedPath += string(filepath.Separator)
}
if filepath.Base(path) != filepath.Base(resolvedPath) {
// In the case where the path had a trailing separator and a symlink
// evaluation has changed the last path component, we will need to
// rebase the name in the archive that is being copied to match the
// originally requested name.
rebaseName = filepath.Base(path)
}
return resolvedPath, rebaseName
}

11
vendor/github.com/containers/storage/pkg/archive/copy_unix.go generated vendored Normal file
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@ -0,0 +1,11 @@
// +build !windows
package archive
import (
"path/filepath"
)
func normalizePath(path string) string {
return filepath.ToSlash(path)
}

9
vendor/github.com/containers/storage/pkg/archive/copy_windows.go generated vendored Normal file
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@ -0,0 +1,9 @@
package archive
import (
"path/filepath"
)
func normalizePath(path string) string {
return filepath.FromSlash(path)
}

279
vendor/github.com/containers/storage/pkg/archive/diff.go generated vendored Normal file
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@ -0,0 +1,279 @@
package archive
import (
"archive/tar"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"strings"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/pools"
"github.com/containers/storage/pkg/system"
)
// UnpackLayer unpack `layer` to a `dest`. The stream `layer` can be
// compressed or uncompressed.
// Returns the size in bytes of the contents of the layer.
func UnpackLayer(dest string, layer Reader, options *TarOptions) (size int64, err error) {
tr := tar.NewReader(layer)
trBuf := pools.BufioReader32KPool.Get(tr)
defer pools.BufioReader32KPool.Put(trBuf)
var dirs []*tar.Header
unpackedPaths := make(map[string]struct{})
if options == nil {
options = &TarOptions{}
}
if options.ExcludePatterns == nil {
options.ExcludePatterns = []string{}
}
remappedRootUID, remappedRootGID, err := idtools.GetRootUIDGID(options.UIDMaps, options.GIDMaps)
if err != nil {
return 0, err
}
aufsTempdir := ""
aufsHardlinks := make(map[string]*tar.Header)
if options == nil {
options = &TarOptions{}
}
// Iterate through the files in the archive.
for {
hdr, err := tr.Next()
if err == io.EOF {
// end of tar archive
break
}
if err != nil {
return 0, err
}
size += hdr.Size
// Normalize name, for safety and for a simple is-root check
hdr.Name = filepath.Clean(hdr.Name)
// Windows does not support filenames with colons in them. Ignore
// these files. This is not a problem though (although it might
// appear that it is). Let's suppose a client is running docker pull.
// The daemon it points to is Windows. Would it make sense for the
// client to be doing a docker pull Ubuntu for example (which has files
// with colons in the name under /usr/share/man/man3)? No, absolutely
// not as it would really only make sense that they were pulling a
// Windows image. However, for development, it is necessary to be able
// to pull Linux images which are in the repository.
//
// TODO Windows. Once the registry is aware of what images are Windows-
// specific or Linux-specific, this warning should be changed to an error
// to cater for the situation where someone does manage to upload a Linux
// image but have it tagged as Windows inadvertently.
if runtime.GOOS == "windows" {
if strings.Contains(hdr.Name, ":") {
logrus.Warnf("Windows: Ignoring %s (is this a Linux image?)", hdr.Name)
continue
}
}
// Note as these operations are platform specific, so must the slash be.
if !strings.HasSuffix(hdr.Name, string(os.PathSeparator)) {
// Not the root directory, ensure that the parent directory exists.
// This happened in some tests where an image had a tarfile without any
// parent directories.
parent := filepath.Dir(hdr.Name)
parentPath := filepath.Join(dest, parent)
if _, err := os.Lstat(parentPath); err != nil && os.IsNotExist(err) {
err = system.MkdirAll(parentPath, 0600)
if err != nil {
return 0, err
}
}
}
// Skip AUFS metadata dirs
if strings.HasPrefix(hdr.Name, WhiteoutMetaPrefix) {
// Regular files inside /.wh..wh.plnk can be used as hardlink targets
// We don't want this directory, but we need the files in them so that
// such hardlinks can be resolved.
if strings.HasPrefix(hdr.Name, WhiteoutLinkDir) && hdr.Typeflag == tar.TypeReg {
basename := filepath.Base(hdr.Name)
aufsHardlinks[basename] = hdr
if aufsTempdir == "" {
if aufsTempdir, err = ioutil.TempDir("", "dockerplnk"); err != nil {
return 0, err
}
defer os.RemoveAll(aufsTempdir)
}
if err := createTarFile(filepath.Join(aufsTempdir, basename), dest, hdr, tr, true, nil); err != nil {
return 0, err
}
}
if hdr.Name != WhiteoutOpaqueDir {
continue
}
}
path := filepath.Join(dest, hdr.Name)
rel, err := filepath.Rel(dest, path)
if err != nil {
return 0, err
}
// Note as these operations are platform specific, so must the slash be.
if strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
return 0, breakoutError(fmt.Errorf("%q is outside of %q", hdr.Name, dest))
}
base := filepath.Base(path)
if strings.HasPrefix(base, WhiteoutPrefix) {
dir := filepath.Dir(path)
if base == WhiteoutOpaqueDir {
_, err := os.Lstat(dir)
if err != nil {
return 0, err
}
err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
if os.IsNotExist(err) {
err = nil // parent was deleted
}
return err
}
if path == dir {
return nil
}
if _, exists := unpackedPaths[path]; !exists {
err := os.RemoveAll(path)
return err
}
return nil
})
if err != nil {
return 0, err
}
} else {
originalBase := base[len(WhiteoutPrefix):]
originalPath := filepath.Join(dir, originalBase)
if err := os.RemoveAll(originalPath); err != nil {
return 0, err
}
}
} else {
// If path exits we almost always just want to remove and replace it.
// The only exception is when it is a directory *and* the file from
// the layer is also a directory. Then we want to merge them (i.e.
// just apply the metadata from the layer).
if fi, err := os.Lstat(path); err == nil {
if !(fi.IsDir() && hdr.Typeflag == tar.TypeDir) {
if err := os.RemoveAll(path); err != nil {
return 0, err
}
}
}
trBuf.Reset(tr)
srcData := io.Reader(trBuf)
srcHdr := hdr
// Hard links into /.wh..wh.plnk don't work, as we don't extract that directory, so
// we manually retarget these into the temporary files we extracted them into
if hdr.Typeflag == tar.TypeLink && strings.HasPrefix(filepath.Clean(hdr.Linkname), WhiteoutLinkDir) {
linkBasename := filepath.Base(hdr.Linkname)
srcHdr = aufsHardlinks[linkBasename]
if srcHdr == nil {
return 0, fmt.Errorf("Invalid aufs hardlink")
}
tmpFile, err := os.Open(filepath.Join(aufsTempdir, linkBasename))
if err != nil {
return 0, err
}
defer tmpFile.Close()
srcData = tmpFile
}
// if the options contain a uid & gid maps, convert header uid/gid
// entries using the maps such that lchown sets the proper mapped
// uid/gid after writing the file. We only perform this mapping if
// the file isn't already owned by the remapped root UID or GID, as
// that specific uid/gid has no mapping from container -> host, and
// those files already have the proper ownership for inside the
// container.
if srcHdr.Uid != remappedRootUID {
xUID, err := idtools.ToHost(srcHdr.Uid, options.UIDMaps)
if err != nil {
return 0, err
}
srcHdr.Uid = xUID
}
if srcHdr.Gid != remappedRootGID {
xGID, err := idtools.ToHost(srcHdr.Gid, options.GIDMaps)
if err != nil {
return 0, err
}
srcHdr.Gid = xGID
}
if err := createTarFile(path, dest, srcHdr, srcData, true, nil); err != nil {
return 0, err
}
// Directory mtimes must be handled at the end to avoid further
// file creation in them to modify the directory mtime
if hdr.Typeflag == tar.TypeDir {
dirs = append(dirs, hdr)
}
unpackedPaths[path] = struct{}{}
}
}
for _, hdr := range dirs {
path := filepath.Join(dest, hdr.Name)
if err := system.Chtimes(path, hdr.AccessTime, hdr.ModTime); err != nil {
return 0, err
}
}
return size, nil
}
// ApplyLayer parses a diff in the standard layer format from `layer`,
// and applies it to the directory `dest`. The stream `layer` can be
// compressed or uncompressed.
// Returns the size in bytes of the contents of the layer.
func ApplyLayer(dest string, layer Reader) (int64, error) {
return applyLayerHandler(dest, layer, &TarOptions{}, true)
}
// ApplyUncompressedLayer parses a diff in the standard layer format from
// `layer`, and applies it to the directory `dest`. The stream `layer`
// can only be uncompressed.
// Returns the size in bytes of the contents of the layer.
func ApplyUncompressedLayer(dest string, layer Reader, options *TarOptions) (int64, error) {
return applyLayerHandler(dest, layer, options, false)
}
// do the bulk load of ApplyLayer, but allow for not calling DecompressStream
func applyLayerHandler(dest string, layer Reader, options *TarOptions, decompress bool) (int64, error) {
dest = filepath.Clean(dest)
// We need to be able to set any perms
oldmask, err := system.Umask(0)
if err != nil {
return 0, err
}
defer system.Umask(oldmask) // ignore err, ErrNotSupportedPlatform
if decompress {
layer, err = DecompressStream(layer)
if err != nil {
return 0, err
}
}
return UnpackLayer(dest, layer, options)
}

97
vendor/github.com/containers/storage/pkg/archive/example_changes.go generated vendored Normal file
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// +build ignore
// Simple tool to create an archive stream from an old and new directory
//
// By default it will stream the comparison of two temporary directories with junk files
package main
import (
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"github.com/Sirupsen/logrus"
"github.com/containers/storage/pkg/archive"
)
var (
flDebug = flag.Bool("D", false, "debugging output")
flNewDir = flag.String("newdir", "", "")
flOldDir = flag.String("olddir", "", "")
log = logrus.New()
)
func main() {
flag.Usage = func() {
fmt.Println("Produce a tar from comparing two directory paths. By default a demo tar is created of around 200 files (including hardlinks)")
fmt.Printf("%s [OPTIONS]\n", os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
log.Out = os.Stderr
if (len(os.Getenv("DEBUG")) > 0) || *flDebug {
logrus.SetLevel(logrus.DebugLevel)
}
var newDir, oldDir string
if len(*flNewDir) == 0 {
var err error
newDir, err = ioutil.TempDir("", "docker-test-newDir")
if err != nil {
log.Fatal(err)
}
defer os.RemoveAll(newDir)
if _, err := prepareUntarSourceDirectory(100, newDir, true); err != nil {
log.Fatal(err)
}
} else {
newDir = *flNewDir
}
if len(*flOldDir) == 0 {
oldDir, err := ioutil.TempDir("", "docker-test-oldDir")
if err != nil {
log.Fatal(err)
}
defer os.RemoveAll(oldDir)
} else {
oldDir = *flOldDir
}
changes, err := archive.ChangesDirs(newDir, oldDir)
if err != nil {
log.Fatal(err)
}
a, err := archive.ExportChanges(newDir, changes)
if err != nil {
log.Fatal(err)
}
defer a.Close()
i, err := io.Copy(os.Stdout, a)
if err != nil && err != io.EOF {
log.Fatal(err)
}
fmt.Fprintf(os.Stderr, "wrote archive of %d bytes", i)
}
func prepareUntarSourceDirectory(numberOfFiles int, targetPath string, makeLinks bool) (int, error) {
fileData := []byte("fooo")
for n := 0; n < numberOfFiles; n++ {
fileName := fmt.Sprintf("file-%d", n)
if err := ioutil.WriteFile(path.Join(targetPath, fileName), fileData, 0700); err != nil {
return 0, err
}
if makeLinks {
if err := os.Link(path.Join(targetPath, fileName), path.Join(targetPath, fileName+"-link")); err != nil {
return 0, err
}
}
}
totalSize := numberOfFiles * len(fileData)
return totalSize, nil
}

16
vendor/github.com/containers/storage/pkg/archive/time_linux.go generated vendored Normal file
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@ -0,0 +1,16 @@
package archive
import (
"syscall"
"time"
)
func timeToTimespec(time time.Time) (ts syscall.Timespec) {
if time.IsZero() {
// Return UTIME_OMIT special value
ts.Sec = 0
ts.Nsec = ((1 << 30) - 2)
return
}
return syscall.NsecToTimespec(time.UnixNano())
}

16
vendor/github.com/containers/storage/pkg/archive/time_unsupported.go generated vendored Normal file
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@ -0,0 +1,16 @@
// +build !linux
package archive
import (
"syscall"
"time"
)
func timeToTimespec(time time.Time) (ts syscall.Timespec) {
nsec := int64(0)
if !time.IsZero() {
nsec = time.UnixNano()
}
return syscall.NsecToTimespec(nsec)
}

23
vendor/github.com/containers/storage/pkg/archive/whiteouts.go generated vendored Normal file
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@ -0,0 +1,23 @@
package archive
// Whiteouts are files with a special meaning for the layered filesystem.
// Docker uses AUFS whiteout files inside exported archives. In other
// filesystems these files are generated/handled on tar creation/extraction.
// WhiteoutPrefix prefix means file is a whiteout. If this is followed by a
// filename this means that file has been removed from the base layer.
const WhiteoutPrefix = ".wh."
// WhiteoutMetaPrefix prefix means whiteout has a special meaning and is not
// for removing an actual file. Normally these files are excluded from exported
// archives.
const WhiteoutMetaPrefix = WhiteoutPrefix + WhiteoutPrefix
// WhiteoutLinkDir is a directory AUFS uses for storing hardlink links to other
// layers. Normally these should not go into exported archives and all changed
// hardlinks should be copied to the top layer.
const WhiteoutLinkDir = WhiteoutMetaPrefix + "plnk"
// WhiteoutOpaqueDir file means directory has been made opaque - meaning
// readdir calls to this directory do not follow to lower layers.
const WhiteoutOpaqueDir = WhiteoutMetaPrefix + ".opq"

59
vendor/github.com/containers/storage/pkg/archive/wrap.go generated vendored Normal file
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@ -0,0 +1,59 @@
package archive
import (
"archive/tar"
"bytes"
"io/ioutil"
)
// Generate generates a new archive from the content provided
// as input.
//
// `files` is a sequence of path/content pairs. A new file is
// added to the archive for each pair.
// If the last pair is incomplete, the file is created with an
// empty content. For example:
//
// Generate("foo.txt", "hello world", "emptyfile")
//
// The above call will return an archive with 2 files:
// * ./foo.txt with content "hello world"
// * ./empty with empty content
//
// FIXME: stream content instead of buffering
// FIXME: specify permissions and other archive metadata
func Generate(input ...string) (Archive, error) {
files := parseStringPairs(input...)
buf := new(bytes.Buffer)
tw := tar.NewWriter(buf)
for _, file := range files {
name, content := file[0], file[1]
hdr := &tar.Header{
Name: name,
Size: int64(len(content)),
}
if err := tw.WriteHeader(hdr); err != nil {
return nil, err
}
if _, err := tw.Write([]byte(content)); err != nil {
return nil, err
}
}
if err := tw.Close(); err != nil {
return nil, err
}
return ioutil.NopCloser(buf), nil
}
func parseStringPairs(input ...string) (output [][2]string) {
output = make([][2]string, 0, len(input)/2+1)
for i := 0; i < len(input); i += 2 {
var pair [2]string
pair[0] = input[i]
if i+1 < len(input) {
pair[1] = input[i+1]
}
output = append(output, pair)
}
return
}

97
vendor/github.com/containers/storage/pkg/chrootarchive/archive.go generated vendored Normal file
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package chrootarchive
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/idtools"
)
var chrootArchiver = &archive.Archiver{Untar: Untar}
// Untar reads a stream of bytes from `archive`, parses it as a tar archive,
// and unpacks it into the directory at `dest`.
// The archive may be compressed with one of the following algorithms:
// identity (uncompressed), gzip, bzip2, xz.
func Untar(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
return untarHandler(tarArchive, dest, options, true)
}
// UntarUncompressed reads a stream of bytes from `archive`, parses it as a tar archive,
// and unpacks it into the directory at `dest`.
// The archive must be an uncompressed stream.
func UntarUncompressed(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
return untarHandler(tarArchive, dest, options, false)
}
// Handler for teasing out the automatic decompression
func untarHandler(tarArchive io.Reader, dest string, options *archive.TarOptions, decompress bool) error {
if tarArchive == nil {
return fmt.Errorf("Empty archive")
}
if options == nil {
options = &archive.TarOptions{}
}
if options.ExcludePatterns == nil {
options.ExcludePatterns = []string{}
}
rootUID, rootGID, err := idtools.GetRootUIDGID(options.UIDMaps, options.GIDMaps)
if err != nil {
return err
}
dest = filepath.Clean(dest)
if _, err := os.Stat(dest); os.IsNotExist(err) {
if err := idtools.MkdirAllNewAs(dest, 0755, rootUID, rootGID); err != nil {
return err
}
}
r := ioutil.NopCloser(tarArchive)
if decompress {
decompressedArchive, err := archive.DecompressStream(tarArchive)
if err != nil {
return err
}
defer decompressedArchive.Close()
r = decompressedArchive
}
return invokeUnpack(r, dest, options)
}
// TarUntar is a convenience function which calls Tar and Untar, with the output of one piped into the other.
// If either Tar or Untar fails, TarUntar aborts and returns the error.
func TarUntar(src, dst string) error {
return chrootArchiver.TarUntar(src, dst)
}
// CopyWithTar creates a tar archive of filesystem path `src`, and
// unpacks it at filesystem path `dst`.
// The archive is streamed directly with fixed buffering and no
// intermediary disk IO.
func CopyWithTar(src, dst string) error {
return chrootArchiver.CopyWithTar(src, dst)
}
// CopyFileWithTar emulates the behavior of the 'cp' command-line
// for a single file. It copies a regular file from path `src` to
// path `dst`, and preserves all its metadata.
//
// If `dst` ends with a trailing slash '/' ('\' on Windows), the final
// destination path will be `dst/base(src)` or `dst\base(src)`
func CopyFileWithTar(src, dst string) (err error) {
return chrootArchiver.CopyFileWithTar(src, dst)
}
// UntarPath is a convenience function which looks for an archive
// at filesystem path `src`, and unpacks it at `dst`.
func UntarPath(src, dst string) error {
return chrootArchiver.UntarPath(src, dst)
}

86
vendor/github.com/containers/storage/pkg/chrootarchive/archive_unix.go generated vendored Normal file
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@ -0,0 +1,86 @@
// +build !windows
package chrootarchive
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"runtime"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/reexec"
)
// untar is the entry-point for docker-untar on re-exec. This is not used on
// Windows as it does not support chroot, hence no point sandboxing through
// chroot and rexec.
func untar() {
runtime.LockOSThread()
flag.Parse()
var options *archive.TarOptions
//read the options from the pipe "ExtraFiles"
if err := json.NewDecoder(os.NewFile(3, "options")).Decode(&options); err != nil {
fatal(err)
}
if err := chroot(flag.Arg(0)); err != nil {
fatal(err)
}
if err := archive.Unpack(os.Stdin, "/", options); err != nil {
fatal(err)
}
// fully consume stdin in case it is zero padded
if _, err := flush(os.Stdin); err != nil {
fatal(err)
}
os.Exit(0)
}
func invokeUnpack(decompressedArchive io.Reader, dest string, options *archive.TarOptions) error {
// We can't pass a potentially large exclude list directly via cmd line
// because we easily overrun the kernel's max argument/environment size
// when the full image list is passed (e.g. when this is used by
// `docker load`). We will marshall the options via a pipe to the
// child
r, w, err := os.Pipe()
if err != nil {
return fmt.Errorf("Untar pipe failure: %v", err)
}
cmd := reexec.Command("docker-untar", dest)
cmd.Stdin = decompressedArchive
cmd.ExtraFiles = append(cmd.ExtraFiles, r)
output := bytes.NewBuffer(nil)
cmd.Stdout = output
cmd.Stderr = output
if err := cmd.Start(); err != nil {
return fmt.Errorf("Untar error on re-exec cmd: %v", err)
}
//write the options to the pipe for the untar exec to read
if err := json.NewEncoder(w).Encode(options); err != nil {
return fmt.Errorf("Untar json encode to pipe failed: %v", err)
}
w.Close()
if err := cmd.Wait(); err != nil {
// when `xz -d -c -q | docker-untar ...` failed on docker-untar side,
// we need to exhaust `xz`'s output, otherwise the `xz` side will be
// pending on write pipe forever
io.Copy(ioutil.Discard, decompressedArchive)
return fmt.Errorf("Error processing tar file(%v): %s", err, output)
}
return nil
}

22
vendor/github.com/containers/storage/pkg/chrootarchive/archive_windows.go generated vendored Normal file
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@ -0,0 +1,22 @@
package chrootarchive
import (
"io"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/longpath"
)
// chroot is not supported by Windows
func chroot(path string) error {
return nil
}
func invokeUnpack(decompressedArchive io.ReadCloser,
dest string,
options *archive.TarOptions) error {
// Windows is different to Linux here because Windows does not support
// chroot. Hence there is no point sandboxing a chrooted process to
// do the unpack. We call inline instead within the daemon process.
return archive.Unpack(decompressedArchive, longpath.AddPrefix(dest), options)
}

103
vendor/github.com/containers/storage/pkg/chrootarchive/chroot_linux.go generated vendored Normal file
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@ -0,0 +1,103 @@
package chrootarchive
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"syscall"
"github.com/containers/storage/pkg/mount"
)
// chroot on linux uses pivot_root instead of chroot
// pivot_root takes a new root and an old root.
// Old root must be a sub-dir of new root, it is where the current rootfs will reside after the call to pivot_root.
// New root is where the new rootfs is set to.
// Old root is removed after the call to pivot_root so it is no longer available under the new root.
// This is similar to how libcontainer sets up a container's rootfs
func chroot(path string) (err error) {
if err := syscall.Unshare(syscall.CLONE_NEWNS); err != nil {
return fmt.Errorf("Error creating mount namespace before pivot: %v", err)
}
if err := mount.MakeRPrivate(path); err != nil {
return err
}
// setup oldRoot for pivot_root
pivotDir, err := ioutil.TempDir(path, ".pivot_root")
if err != nil {
return fmt.Errorf("Error setting up pivot dir: %v", err)
}
var mounted bool
defer func() {
if mounted {
// make sure pivotDir is not mounted before we try to remove it
if errCleanup := syscall.Unmount(pivotDir, syscall.MNT_DETACH); errCleanup != nil {
if err == nil {
err = errCleanup
}
return
}
}
errCleanup := os.Remove(pivotDir)
// pivotDir doesn't exist if pivot_root failed and chroot+chdir was successful
// because we already cleaned it up on failed pivot_root
if errCleanup != nil && !os.IsNotExist(errCleanup) {
errCleanup = fmt.Errorf("Error cleaning up after pivot: %v", errCleanup)
if err == nil {
err = errCleanup
}
}
if errCleanup := syscall.Unmount("/", syscall.MNT_DETACH); errCleanup != nil {
if err == nil {
err = fmt.Errorf("error unmounting root: %v", errCleanup)
}
return
}
}()
if err := syscall.PivotRoot(path, pivotDir); err != nil {
// If pivot fails, fall back to the normal chroot after cleaning up temp dir
if err := os.Remove(pivotDir); err != nil {
return fmt.Errorf("Error cleaning up after failed pivot: %v", err)
}
return realChroot(path)
}
mounted = true
// This is the new path for where the old root (prior to the pivot) has been moved to
// This dir contains the rootfs of the caller, which we need to remove so it is not visible during extraction
pivotDir = filepath.Join("/", filepath.Base(pivotDir))
if err := syscall.Chdir("/"); err != nil {
return fmt.Errorf("Error changing to new root: %v", err)
}
// Make the pivotDir (where the old root lives) private so it can be unmounted without propagating to the host
if err := syscall.Mount("", pivotDir, "", syscall.MS_PRIVATE|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("Error making old root private after pivot: %v", err)
}
// Now unmount the old root so it's no longer visible from the new root
if err := syscall.Unmount(pivotDir, syscall.MNT_DETACH); err != nil {
return fmt.Errorf("Error while unmounting old root after pivot: %v", err)
}
mounted = false
return nil
}
func realChroot(path string) error {
if err := syscall.Chroot(path); err != nil {
return fmt.Errorf("Error after fallback to chroot: %v", err)
}
if err := syscall.Chdir("/"); err != nil {
return fmt.Errorf("Error changing to new root after chroot: %v", err)
}
return nil
}

12
vendor/github.com/containers/storage/pkg/chrootarchive/chroot_unix.go generated vendored Normal file
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@ -0,0 +1,12 @@
// +build !windows,!linux
package chrootarchive
import "syscall"
func chroot(path string) error {
if err := syscall.Chroot(path); err != nil {
return err
}
return syscall.Chdir("/")
}

19
vendor/github.com/containers/storage/pkg/chrootarchive/diff.go generated vendored Normal file
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@ -0,0 +1,19 @@
package chrootarchive
import "github.com/containers/storage/pkg/archive"
// ApplyLayer parses a diff in the standard layer format from `layer`,
// and applies it to the directory `dest`. The stream `layer` can only be
// uncompressed.
// Returns the size in bytes of the contents of the layer.
func ApplyLayer(dest string, layer archive.Reader) (size int64, err error) {
return applyLayerHandler(dest, layer, &archive.TarOptions{}, true)
}
// ApplyUncompressedLayer parses a diff in the standard layer format from
// `layer`, and applies it to the directory `dest`. The stream `layer`
// can only be uncompressed.
// Returns the size in bytes of the contents of the layer.
func ApplyUncompressedLayer(dest string, layer archive.Reader, options *archive.TarOptions) (int64, error) {
return applyLayerHandler(dest, layer, options, false)
}

120
vendor/github.com/containers/storage/pkg/chrootarchive/diff_unix.go generated vendored Normal file
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@ -0,0 +1,120 @@
//+build !windows
package chrootarchive
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/reexec"
"github.com/containers/storage/pkg/system"
)
type applyLayerResponse struct {
LayerSize int64 `json:"layerSize"`
}
// applyLayer is the entry-point for docker-applylayer on re-exec. This is not
// used on Windows as it does not support chroot, hence no point sandboxing
// through chroot and rexec.
func applyLayer() {
var (
tmpDir = ""
err error
options *archive.TarOptions
)
runtime.LockOSThread()
flag.Parse()
if err := chroot(flag.Arg(0)); err != nil {
fatal(err)
}
// We need to be able to set any perms
oldmask, err := system.Umask(0)
defer system.Umask(oldmask)
if err != nil {
fatal(err)
}
if err := json.Unmarshal([]byte(os.Getenv("OPT")), &options); err != nil {
fatal(err)
}
if tmpDir, err = ioutil.TempDir("/", "temp-docker-extract"); err != nil {
fatal(err)
}
os.Setenv("TMPDIR", tmpDir)
size, err := archive.UnpackLayer("/", os.Stdin, options)
os.RemoveAll(tmpDir)
if err != nil {
fatal(err)
}
encoder := json.NewEncoder(os.Stdout)
if err := encoder.Encode(applyLayerResponse{size}); err != nil {
fatal(fmt.Errorf("unable to encode layerSize JSON: %s", err))
}
if _, err := flush(os.Stdin); err != nil {
fatal(err)
}
os.Exit(0)
}
// applyLayerHandler parses a diff in the standard layer format from `layer`, and
// applies it to the directory `dest`. Returns the size in bytes of the
// contents of the layer.
func applyLayerHandler(dest string, layer archive.Reader, options *archive.TarOptions, decompress bool) (size int64, err error) {
dest = filepath.Clean(dest)
if decompress {
decompressed, err := archive.DecompressStream(layer)
if err != nil {
return 0, err
}
defer decompressed.Close()
layer = decompressed
}
if options == nil {
options = &archive.TarOptions{}
}
if options.ExcludePatterns == nil {
options.ExcludePatterns = []string{}
}
data, err := json.Marshal(options)
if err != nil {
return 0, fmt.Errorf("ApplyLayer json encode: %v", err)
}
cmd := reexec.Command("docker-applyLayer", dest)
cmd.Stdin = layer
cmd.Env = append(cmd.Env, fmt.Sprintf("OPT=%s", data))
outBuf, errBuf := new(bytes.Buffer), new(bytes.Buffer)
cmd.Stdout, cmd.Stderr = outBuf, errBuf
if err = cmd.Run(); err != nil {
return 0, fmt.Errorf("ApplyLayer %s stdout: %s stderr: %s", err, outBuf, errBuf)
}
// Stdout should be a valid JSON struct representing an applyLayerResponse.
response := applyLayerResponse{}
decoder := json.NewDecoder(outBuf)
if err = decoder.Decode(&response); err != nil {
return 0, fmt.Errorf("unable to decode ApplyLayer JSON response: %s", err)
}
return response.LayerSize, nil
}

44
vendor/github.com/containers/storage/pkg/chrootarchive/diff_windows.go generated vendored Normal file
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@ -0,0 +1,44 @@
package chrootarchive
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/longpath"
)
// applyLayerHandler parses a diff in the standard layer format from `layer`, and
// applies it to the directory `dest`. Returns the size in bytes of the
// contents of the layer.
func applyLayerHandler(dest string, layer archive.Reader, options *archive.TarOptions, decompress bool) (size int64, err error) {
dest = filepath.Clean(dest)
// Ensure it is a Windows-style volume path
dest = longpath.AddPrefix(dest)
if decompress {
decompressed, err := archive.DecompressStream(layer)
if err != nil {
return 0, err
}
defer decompressed.Close()
layer = decompressed
}
tmpDir, err := ioutil.TempDir(os.Getenv("temp"), "temp-docker-extract")
if err != nil {
return 0, fmt.Errorf("ApplyLayer failed to create temp-docker-extract under %s. %s", dest, err)
}
s, err := archive.UnpackLayer(dest, layer, nil)
os.RemoveAll(tmpDir)
if err != nil {
return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s", err, dest)
}
return s, nil
}

28
vendor/github.com/containers/storage/pkg/chrootarchive/init_unix.go generated vendored Normal file
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@ -0,0 +1,28 @@
// +build !windows
package chrootarchive
import (
"fmt"
"io"
"io/ioutil"
"os"
"github.com/containers/storage/pkg/reexec"
)
func init() {
reexec.Register("docker-applyLayer", applyLayer)
reexec.Register("docker-untar", untar)
}
func fatal(err error) {
fmt.Fprint(os.Stderr, err)
os.Exit(1)
}
// flush consumes all the bytes from the reader discarding
// any errors
func flush(r io.Reader) (bytes int64, err error) {
return io.Copy(ioutil.Discard, r)
}

4
vendor/github.com/containers/storage/pkg/chrootarchive/init_windows.go generated vendored Normal file
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@ -0,0 +1,4 @@
package chrootarchive
func init() {
}

807
vendor/github.com/containers/storage/pkg/devicemapper/devmapper.go generated vendored Normal file
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@ -0,0 +1,807 @@
// +build linux
package devicemapper
import (
"errors"
"fmt"
"os"
"runtime"
"syscall"
"unsafe"
"github.com/Sirupsen/logrus"
)
// DevmapperLogger defines methods for logging with devicemapper.
type DevmapperLogger interface {
DMLog(level int, file string, line int, dmError int, message string)
}
const (
deviceCreate TaskType = iota
deviceReload
deviceRemove
deviceRemoveAll
deviceSuspend
deviceResume
deviceInfo
deviceDeps
deviceRename
deviceVersion
deviceStatus
deviceTable
deviceWaitevent
deviceList
deviceClear
deviceMknodes
deviceListVersions
deviceTargetMsg
deviceSetGeometry
)
const (
addNodeOnResume AddNodeType = iota
addNodeOnCreate
)
// List of errors returned when using devicemapper.
var (
ErrTaskRun = errors.New("dm_task_run failed")
ErrTaskSetName = errors.New("dm_task_set_name failed")
ErrTaskSetMessage = errors.New("dm_task_set_message failed")
ErrTaskSetAddNode = errors.New("dm_task_set_add_node failed")
ErrTaskSetRo = errors.New("dm_task_set_ro failed")
ErrTaskAddTarget = errors.New("dm_task_add_target failed")
ErrTaskSetSector = errors.New("dm_task_set_sector failed")
ErrTaskGetDeps = errors.New("dm_task_get_deps failed")
ErrTaskGetInfo = errors.New("dm_task_get_info failed")
ErrTaskGetDriverVersion = errors.New("dm_task_get_driver_version failed")
ErrTaskDeferredRemove = errors.New("dm_task_deferred_remove failed")
ErrTaskSetCookie = errors.New("dm_task_set_cookie failed")
ErrNilCookie = errors.New("cookie ptr can't be nil")
ErrGetBlockSize = errors.New("Can't get block size")
ErrUdevWait = errors.New("wait on udev cookie failed")
ErrSetDevDir = errors.New("dm_set_dev_dir failed")
ErrGetLibraryVersion = errors.New("dm_get_library_version failed")
ErrCreateRemoveTask = errors.New("Can't create task of type deviceRemove")
ErrRunRemoveDevice = errors.New("running RemoveDevice failed")
ErrInvalidAddNode = errors.New("Invalid AddNode type")
ErrBusy = errors.New("Device is Busy")
ErrDeviceIDExists = errors.New("Device Id Exists")
ErrEnxio = errors.New("No such device or address")
)
var (
dmSawBusy bool
dmSawExist bool
dmSawEnxio bool // No Such Device or Address
)
type (
// Task represents a devicemapper task (like lvcreate, etc.) ; a task is needed for each ioctl
// command to execute.
Task struct {
unmanaged *cdmTask
}
// Deps represents dependents (layer) of a device.
Deps struct {
Count uint32
Filler uint32
Device []uint64
}
// Info represents information about a device.
Info struct {
Exists int
Suspended int
LiveTable int
InactiveTable int
OpenCount int32
EventNr uint32
Major uint32
Minor uint32
ReadOnly int
TargetCount int32
DeferredRemove int
}
// TaskType represents a type of task
TaskType int
// AddNodeType represents a type of node to be added
AddNodeType int
)
// DeviceIDExists returns whether error conveys the information about device Id already
// exist or not. This will be true if device creation or snap creation
// operation fails if device or snap device already exists in pool.
// Current implementation is little crude as it scans the error string
// for exact pattern match. Replacing it with more robust implementation
// is desirable.
func DeviceIDExists(err error) bool {
return fmt.Sprint(err) == fmt.Sprint(ErrDeviceIDExists)
}
func (t *Task) destroy() {
if t != nil {
DmTaskDestroy(t.unmanaged)
runtime.SetFinalizer(t, nil)
}
}
// TaskCreateNamed is a convenience function for TaskCreate when a name
// will be set on the task as well
func TaskCreateNamed(t TaskType, name string) (*Task, error) {
task := TaskCreate(t)
if task == nil {
return nil, fmt.Errorf("devicemapper: Can't create task of type %d", int(t))
}
if err := task.setName(name); err != nil {
return nil, fmt.Errorf("devicemapper: Can't set task name %s", name)
}
return task, nil
}
// TaskCreate initializes a devicemapper task of tasktype
func TaskCreate(tasktype TaskType) *Task {
Ctask := DmTaskCreate(int(tasktype))
if Ctask == nil {
return nil
}
task := &Task{unmanaged: Ctask}
runtime.SetFinalizer(task, (*Task).destroy)
return task
}
func (t *Task) run() error {
if res := DmTaskRun(t.unmanaged); res != 1 {
return ErrTaskRun
}
return nil
}
func (t *Task) setName(name string) error {
if res := DmTaskSetName(t.unmanaged, name); res != 1 {
return ErrTaskSetName
}
return nil
}
func (t *Task) setMessage(message string) error {
if res := DmTaskSetMessage(t.unmanaged, message); res != 1 {
return ErrTaskSetMessage
}
return nil
}
func (t *Task) setSector(sector uint64) error {
if res := DmTaskSetSector(t.unmanaged, sector); res != 1 {
return ErrTaskSetSector
}
return nil
}
func (t *Task) setCookie(cookie *uint, flags uint16) error {
if cookie == nil {
return ErrNilCookie
}
if res := DmTaskSetCookie(t.unmanaged, cookie, flags); res != 1 {
return ErrTaskSetCookie
}
return nil
}
func (t *Task) setAddNode(addNode AddNodeType) error {
if addNode != addNodeOnResume && addNode != addNodeOnCreate {
return ErrInvalidAddNode
}
if res := DmTaskSetAddNode(t.unmanaged, addNode); res != 1 {
return ErrTaskSetAddNode
}
return nil
}
func (t *Task) setRo() error {
if res := DmTaskSetRo(t.unmanaged); res != 1 {
return ErrTaskSetRo
}
return nil
}
func (t *Task) addTarget(start, size uint64, ttype, params string) error {
if res := DmTaskAddTarget(t.unmanaged, start, size,
ttype, params); res != 1 {
return ErrTaskAddTarget
}
return nil
}
func (t *Task) getDeps() (*Deps, error) {
var deps *Deps
if deps = DmTaskGetDeps(t.unmanaged); deps == nil {
return nil, ErrTaskGetDeps
}
return deps, nil
}
func (t *Task) getInfo() (*Info, error) {
info := &Info{}
if res := DmTaskGetInfo(t.unmanaged, info); res != 1 {
return nil, ErrTaskGetInfo
}
return info, nil
}
func (t *Task) getInfoWithDeferred() (*Info, error) {
info := &Info{}
if res := DmTaskGetInfoWithDeferred(t.unmanaged, info); res != 1 {
return nil, ErrTaskGetInfo
}
return info, nil
}
func (t *Task) getDriverVersion() (string, error) {
res := DmTaskGetDriverVersion(t.unmanaged)
if res == "" {
return "", ErrTaskGetDriverVersion
}
return res, nil
}
func (t *Task) getNextTarget(next unsafe.Pointer) (nextPtr unsafe.Pointer, start uint64,
length uint64, targetType string, params string) {
return DmGetNextTarget(t.unmanaged, next, &start, &length,
&targetType, &params),
start, length, targetType, params
}
// UdevWait waits for any processes that are waiting for udev to complete the specified cookie.
func UdevWait(cookie *uint) error {
if res := DmUdevWait(*cookie); res != 1 {
logrus.Debugf("devicemapper: Failed to wait on udev cookie %d", *cookie)
return ErrUdevWait
}
return nil
}
// LogInitVerbose is an interface to initialize the verbose logger for the device mapper library.
func LogInitVerbose(level int) {
DmLogInitVerbose(level)
}
var dmLogger DevmapperLogger
// LogInit initializes the logger for the device mapper library.
func LogInit(logger DevmapperLogger) {
dmLogger = logger
LogWithErrnoInit()
}
// SetDevDir sets the dev folder for the device mapper library (usually /dev).
func SetDevDir(dir string) error {
if res := DmSetDevDir(dir); res != 1 {
logrus.Debug("devicemapper: Error dm_set_dev_dir")
return ErrSetDevDir
}
return nil
}
// GetLibraryVersion returns the device mapper library version.
func GetLibraryVersion() (string, error) {
var version string
if res := DmGetLibraryVersion(&version); res != 1 {
return "", ErrGetLibraryVersion
}
return version, nil
}
// UdevSyncSupported returns whether device-mapper is able to sync with udev
//
// This is essential otherwise race conditions can arise where both udev and
// device-mapper attempt to create and destroy devices.
func UdevSyncSupported() bool {
return DmUdevGetSyncSupport() != 0
}
// UdevSetSyncSupport allows setting whether the udev sync should be enabled.
// The return bool indicates the state of whether the sync is enabled.
func UdevSetSyncSupport(enable bool) bool {
if enable {
DmUdevSetSyncSupport(1)
} else {
DmUdevSetSyncSupport(0)
}
return UdevSyncSupported()
}
// CookieSupported returns whether the version of device-mapper supports the
// use of cookie's in the tasks.
// This is largely a lower level call that other functions use.
func CookieSupported() bool {
return DmCookieSupported() != 0
}
// RemoveDevice is a useful helper for cleaning up a device.
func RemoveDevice(name string) error {
task, err := TaskCreateNamed(deviceRemove, name)
if task == nil {
return err
}
var cookie uint
if err := task.setCookie(&cookie, 0); err != nil {
return fmt.Errorf("devicemapper: Can not set cookie: %s", err)
}
defer UdevWait(&cookie)
dmSawBusy = false // reset before the task is run
if err = task.run(); err != nil {
if dmSawBusy {
return ErrBusy
}
return fmt.Errorf("devicemapper: Error running RemoveDevice %s", err)
}
return nil
}
// RemoveDeviceDeferred is a useful helper for cleaning up a device, but deferred.
func RemoveDeviceDeferred(name string) error {
logrus.Debugf("devicemapper: RemoveDeviceDeferred START(%s)", name)
defer logrus.Debugf("devicemapper: RemoveDeviceDeferred END(%s)", name)
task, err := TaskCreateNamed(deviceRemove, name)
if task == nil {
return err
}
if err := DmTaskDeferredRemove(task.unmanaged); err != 1 {
return ErrTaskDeferredRemove
}
if err = task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running RemoveDeviceDeferred %s", err)
}
return nil
}
// CancelDeferredRemove cancels a deferred remove for a device.
func CancelDeferredRemove(deviceName string) error {
task, err := TaskCreateNamed(deviceTargetMsg, deviceName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("@cancel_deferred_remove")); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawBusy = false
dmSawEnxio = false
if err := task.run(); err != nil {
// A device might be being deleted already
if dmSawBusy {
return ErrBusy
} else if dmSawEnxio {
return ErrEnxio
}
return fmt.Errorf("devicemapper: Error running CancelDeferredRemove %s", err)
}
return nil
}
// GetBlockDeviceSize returns the size of a block device identified by the specified file.
func GetBlockDeviceSize(file *os.File) (uint64, error) {
size, err := ioctlBlkGetSize64(file.Fd())
if err != nil {
logrus.Errorf("devicemapper: Error getblockdevicesize: %s", err)
return 0, ErrGetBlockSize
}
return uint64(size), nil
}
// BlockDeviceDiscard runs discard for the given path.
// This is used as a workaround for the kernel not discarding block so
// on the thin pool when we remove a thinp device, so we do it
// manually
func BlockDeviceDiscard(path string) error {
file, err := os.OpenFile(path, os.O_RDWR, 0)
if err != nil {
return err
}
defer file.Close()
size, err := GetBlockDeviceSize(file)
if err != nil {
return err
}
if err := ioctlBlkDiscard(file.Fd(), 0, size); err != nil {
return err
}
// Without this sometimes the remove of the device that happens after
// discard fails with EBUSY.
syscall.Sync()
return nil
}
// CreatePool is the programmatic example of "dmsetup create".
// It creates a device with the specified poolName, data and metadata file and block size.
func CreatePool(poolName string, dataFile, metadataFile *os.File, poolBlockSize uint32) error {
task, err := TaskCreateNamed(deviceCreate, poolName)
if task == nil {
return err
}
size, err := GetBlockDeviceSize(dataFile)
if err != nil {
return fmt.Errorf("devicemapper: Can't get data size %s", err)
}
params := fmt.Sprintf("%s %s %d 32768 1 skip_block_zeroing", metadataFile.Name(), dataFile.Name(), poolBlockSize)
if err := task.addTarget(0, size/512, "thin-pool", params); err != nil {
return fmt.Errorf("devicemapper: Can't add target %s", err)
}
var cookie uint
var flags uint16
flags = DmUdevDisableSubsystemRulesFlag | DmUdevDisableDiskRulesFlag | DmUdevDisableOtherRulesFlag
if err := task.setCookie(&cookie, flags); err != nil {
return fmt.Errorf("devicemapper: Can't set cookie %s", err)
}
defer UdevWait(&cookie)
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceCreate (CreatePool) %s", err)
}
return nil
}
// ReloadPool is the programmatic example of "dmsetup reload".
// It reloads the table with the specified poolName, data and metadata file and block size.
func ReloadPool(poolName string, dataFile, metadataFile *os.File, poolBlockSize uint32) error {
task, err := TaskCreateNamed(deviceReload, poolName)
if task == nil {
return err
}
size, err := GetBlockDeviceSize(dataFile)
if err != nil {
return fmt.Errorf("devicemapper: Can't get data size %s", err)
}
params := fmt.Sprintf("%s %s %d 32768 1 skip_block_zeroing", metadataFile.Name(), dataFile.Name(), poolBlockSize)
if err := task.addTarget(0, size/512, "thin-pool", params); err != nil {
return fmt.Errorf("devicemapper: Can't add target %s", err)
}
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceCreate %s", err)
}
return nil
}
// GetDeps is the programmatic example of "dmsetup deps".
// It outputs a list of devices referenced by the live table for the specified device.
func GetDeps(name string) (*Deps, error) {
task, err := TaskCreateNamed(deviceDeps, name)
if task == nil {
return nil, err
}
if err := task.run(); err != nil {
return nil, err
}
return task.getDeps()
}
// GetInfo is the programmatic example of "dmsetup info".
// It outputs some brief information about the device.
func GetInfo(name string) (*Info, error) {
task, err := TaskCreateNamed(deviceInfo, name)
if task == nil {
return nil, err
}
if err := task.run(); err != nil {
return nil, err
}
return task.getInfo()
}
// GetInfoWithDeferred is the programmatic example of "dmsetup info", but deferred.
// It outputs some brief information about the device.
func GetInfoWithDeferred(name string) (*Info, error) {
task, err := TaskCreateNamed(deviceInfo, name)
if task == nil {
return nil, err
}
if err := task.run(); err != nil {
return nil, err
}
return task.getInfoWithDeferred()
}
// GetDriverVersion is the programmatic example of "dmsetup version".
// It outputs version information of the driver.
func GetDriverVersion() (string, error) {
task := TaskCreate(deviceVersion)
if task == nil {
return "", fmt.Errorf("devicemapper: Can't create deviceVersion task")
}
if err := task.run(); err != nil {
return "", err
}
return task.getDriverVersion()
}
// GetStatus is the programmatic example of "dmsetup status".
// It outputs status information for the specified device name.
func GetStatus(name string) (uint64, uint64, string, string, error) {
task, err := TaskCreateNamed(deviceStatus, name)
if task == nil {
logrus.Debugf("devicemapper: GetStatus() Error TaskCreateNamed: %s", err)
return 0, 0, "", "", err
}
if err := task.run(); err != nil {
logrus.Debugf("devicemapper: GetStatus() Error Run: %s", err)
return 0, 0, "", "", err
}
devinfo, err := task.getInfo()
if err != nil {
logrus.Debugf("devicemapper: GetStatus() Error GetInfo: %s", err)
return 0, 0, "", "", err
}
if devinfo.Exists == 0 {
logrus.Debugf("devicemapper: GetStatus() Non existing device %s", name)
return 0, 0, "", "", fmt.Errorf("devicemapper: Non existing device %s", name)
}
_, start, length, targetType, params := task.getNextTarget(unsafe.Pointer(nil))
return start, length, targetType, params, nil
}
// GetTable is the programmatic example for "dmsetup table".
// It outputs the current table for the specified device name.
func GetTable(name string) (uint64, uint64, string, string, error) {
task, err := TaskCreateNamed(deviceTable, name)
if task == nil {
logrus.Debugf("devicemapper: GetTable() Error TaskCreateNamed: %s", err)
return 0, 0, "", "", err
}
if err := task.run(); err != nil {
logrus.Debugf("devicemapper: GetTable() Error Run: %s", err)
return 0, 0, "", "", err
}
devinfo, err := task.getInfo()
if err != nil {
logrus.Debugf("devicemapper: GetTable() Error GetInfo: %s", err)
return 0, 0, "", "", err
}
if devinfo.Exists == 0 {
logrus.Debugf("devicemapper: GetTable() Non existing device %s", name)
return 0, 0, "", "", fmt.Errorf("devicemapper: Non existing device %s", name)
}
_, start, length, targetType, params := task.getNextTarget(unsafe.Pointer(nil))
return start, length, targetType, params, nil
}
// SetTransactionID sets a transaction id for the specified device name.
func SetTransactionID(poolName string, oldID uint64, newID uint64) error {
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("set_transaction_id %d %d", oldID, newID)); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running SetTransactionID %s", err)
}
return nil
}
// SuspendDevice is the programmatic example of "dmsetup suspend".
// It suspends the specified device.
func SuspendDevice(name string) error {
task, err := TaskCreateNamed(deviceSuspend, name)
if task == nil {
return err
}
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceSuspend %s", err)
}
return nil
}
// ResumeDevice is the programmatic example of "dmsetup resume".
// It un-suspends the specified device.
func ResumeDevice(name string) error {
task, err := TaskCreateNamed(deviceResume, name)
if task == nil {
return err
}
var cookie uint
if err := task.setCookie(&cookie, 0); err != nil {
return fmt.Errorf("devicemapper: Can't set cookie %s", err)
}
defer UdevWait(&cookie)
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceResume %s", err)
}
return nil
}
// CreateDevice creates a device with the specified poolName with the specified device id.
func CreateDevice(poolName string, deviceID int) error {
logrus.Debugf("devicemapper: CreateDevice(poolName=%v, deviceID=%v)", poolName, deviceID)
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("create_thin %d", deviceID)); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawExist = false // reset before the task is run
if err := task.run(); err != nil {
// Caller wants to know about ErrDeviceIDExists so that it can try with a different device id.
if dmSawExist {
return ErrDeviceIDExists
}
return fmt.Errorf("devicemapper: Error running CreateDevice %s", err)
}
return nil
}
// DeleteDevice deletes a device with the specified poolName with the specified device id.
func DeleteDevice(poolName string, deviceID int) error {
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("delete %d", deviceID)); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawBusy = false
if err := task.run(); err != nil {
if dmSawBusy {
return ErrBusy
}
return fmt.Errorf("devicemapper: Error running DeleteDevice %s", err)
}
return nil
}
// ActivateDevice activates the device identified by the specified
// poolName, name and deviceID with the specified size.
func ActivateDevice(poolName string, name string, deviceID int, size uint64) error {
return activateDevice(poolName, name, deviceID, size, "")
}
// ActivateDeviceWithExternal activates the device identified by the specified
// poolName, name and deviceID with the specified size.
func ActivateDeviceWithExternal(poolName string, name string, deviceID int, size uint64, external string) error {
return activateDevice(poolName, name, deviceID, size, external)
}
func activateDevice(poolName string, name string, deviceID int, size uint64, external string) error {
task, err := TaskCreateNamed(deviceCreate, name)
if task == nil {
return err
}
var params string
if len(external) > 0 {
params = fmt.Sprintf("%s %d %s", poolName, deviceID, external)
} else {
params = fmt.Sprintf("%s %d", poolName, deviceID)
}
if err := task.addTarget(0, size/512, "thin", params); err != nil {
return fmt.Errorf("devicemapper: Can't add target %s", err)
}
if err := task.setAddNode(addNodeOnCreate); err != nil {
return fmt.Errorf("devicemapper: Can't add node %s", err)
}
var cookie uint
if err := task.setCookie(&cookie, 0); err != nil {
return fmt.Errorf("devicemapper: Can't set cookie %s", err)
}
defer UdevWait(&cookie)
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceCreate (ActivateDevice) %s", err)
}
return nil
}
// CreateSnapDevice creates a snapshot based on the device identified by the baseName and baseDeviceId,
func CreateSnapDevice(poolName string, deviceID int, baseName string, baseDeviceID int) error {
devinfo, _ := GetInfo(baseName)
doSuspend := devinfo != nil && devinfo.Exists != 0
if doSuspend {
if err := SuspendDevice(baseName); err != nil {
return err
}
}
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
if doSuspend {
ResumeDevice(baseName)
}
return err
}
if err := task.setSector(0); err != nil {
if doSuspend {
ResumeDevice(baseName)
}
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("create_snap %d %d", deviceID, baseDeviceID)); err != nil {
if doSuspend {
ResumeDevice(baseName)
}
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawExist = false // reset before the task is run
if err := task.run(); err != nil {
if doSuspend {
ResumeDevice(baseName)
}
// Caller wants to know about ErrDeviceIDExists so that it can try with a different device id.
if dmSawExist {
return ErrDeviceIDExists
}
return fmt.Errorf("devicemapper: Error running deviceCreate (createSnapDevice) %s", err)
}
if doSuspend {
if err := ResumeDevice(baseName); err != nil {
return err
}
}
return nil
}

35
vendor/github.com/containers/storage/pkg/devicemapper/devmapper_log.go generated vendored Normal file
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@ -0,0 +1,35 @@
// +build linux
package devicemapper
import "C"
import (
"strings"
)
// Due to the way cgo works this has to be in a separate file, as devmapper.go has
// definitions in the cgo block, which is incompatible with using "//export"
// DevmapperLogCallback exports the devmapper log callback for cgo.
//export DevmapperLogCallback
func DevmapperLogCallback(level C.int, file *C.char, line C.int, dmErrnoOrClass C.int, message *C.char) {
msg := C.GoString(message)
if level < 7 {
if strings.Contains(msg, "busy") {
dmSawBusy = true
}
if strings.Contains(msg, "File exists") {
dmSawExist = true
}
if strings.Contains(msg, "No such device or address") {
dmSawEnxio = true
}
}
if dmLogger != nil {
dmLogger.DMLog(int(level), C.GoString(file), int(line), int(dmErrnoOrClass), msg)
}
}

251
vendor/github.com/containers/storage/pkg/devicemapper/devmapper_wrapper.go generated vendored Normal file
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@ -0,0 +1,251 @@
// +build linux
package devicemapper
/*
#cgo LDFLAGS: -L. -ldevmapper
#include <libdevmapper.h>
#include <linux/fs.h> // FIXME: present only for BLKGETSIZE64, maybe we can remove it?
// FIXME: Can't we find a way to do the logging in pure Go?
extern void DevmapperLogCallback(int level, char *file, int line, int dm_errno_or_class, char *str);
static void log_cb(int level, const char *file, int line, int dm_errno_or_class, const char *f, ...)
{
char buffer[256];
va_list ap;
va_start(ap, f);
vsnprintf(buffer, 256, f, ap);
va_end(ap);
DevmapperLogCallback(level, (char *)file, line, dm_errno_or_class, buffer);
}
static void log_with_errno_init()
{
dm_log_with_errno_init(log_cb);
}
*/
import "C"
import (
"reflect"
"unsafe"
)
type (
cdmTask C.struct_dm_task
)
// IOCTL consts
const (
BlkGetSize64 = C.BLKGETSIZE64
BlkDiscard = C.BLKDISCARD
)
// Devicemapper cookie flags.
const (
DmUdevDisableSubsystemRulesFlag = C.DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG
DmUdevDisableDiskRulesFlag = C.DM_UDEV_DISABLE_DISK_RULES_FLAG
DmUdevDisableOtherRulesFlag = C.DM_UDEV_DISABLE_OTHER_RULES_FLAG
DmUdevDisableLibraryFallback = C.DM_UDEV_DISABLE_LIBRARY_FALLBACK
)
// DeviceMapper mapped functions.
var (
DmGetLibraryVersion = dmGetLibraryVersionFct
DmGetNextTarget = dmGetNextTargetFct
DmLogInitVerbose = dmLogInitVerboseFct
DmSetDevDir = dmSetDevDirFct
DmTaskAddTarget = dmTaskAddTargetFct
DmTaskCreate = dmTaskCreateFct
DmTaskDestroy = dmTaskDestroyFct
DmTaskGetDeps = dmTaskGetDepsFct
DmTaskGetInfo = dmTaskGetInfoFct
DmTaskGetDriverVersion = dmTaskGetDriverVersionFct
DmTaskRun = dmTaskRunFct
DmTaskSetAddNode = dmTaskSetAddNodeFct
DmTaskSetCookie = dmTaskSetCookieFct
DmTaskSetMessage = dmTaskSetMessageFct
DmTaskSetName = dmTaskSetNameFct
DmTaskSetRo = dmTaskSetRoFct
DmTaskSetSector = dmTaskSetSectorFct
DmUdevWait = dmUdevWaitFct
DmUdevSetSyncSupport = dmUdevSetSyncSupportFct
DmUdevGetSyncSupport = dmUdevGetSyncSupportFct
DmCookieSupported = dmCookieSupportedFct
LogWithErrnoInit = logWithErrnoInitFct
DmTaskDeferredRemove = dmTaskDeferredRemoveFct
DmTaskGetInfoWithDeferred = dmTaskGetInfoWithDeferredFct
)
func free(p *C.char) {
C.free(unsafe.Pointer(p))
}
func dmTaskDestroyFct(task *cdmTask) {
C.dm_task_destroy((*C.struct_dm_task)(task))
}
func dmTaskCreateFct(taskType int) *cdmTask {
return (*cdmTask)(C.dm_task_create(C.int(taskType)))
}
func dmTaskRunFct(task *cdmTask) int {
ret, _ := C.dm_task_run((*C.struct_dm_task)(task))
return int(ret)
}
func dmTaskSetNameFct(task *cdmTask, name string) int {
Cname := C.CString(name)
defer free(Cname)
return int(C.dm_task_set_name((*C.struct_dm_task)(task), Cname))
}
func dmTaskSetMessageFct(task *cdmTask, message string) int {
Cmessage := C.CString(message)
defer free(Cmessage)
return int(C.dm_task_set_message((*C.struct_dm_task)(task), Cmessage))
}
func dmTaskSetSectorFct(task *cdmTask, sector uint64) int {
return int(C.dm_task_set_sector((*C.struct_dm_task)(task), C.uint64_t(sector)))
}
func dmTaskSetCookieFct(task *cdmTask, cookie *uint, flags uint16) int {
cCookie := C.uint32_t(*cookie)
defer func() {
*cookie = uint(cCookie)
}()
return int(C.dm_task_set_cookie((*C.struct_dm_task)(task), &cCookie, C.uint16_t(flags)))
}
func dmTaskSetAddNodeFct(task *cdmTask, addNode AddNodeType) int {
return int(C.dm_task_set_add_node((*C.struct_dm_task)(task), C.dm_add_node_t(addNode)))
}
func dmTaskSetRoFct(task *cdmTask) int {
return int(C.dm_task_set_ro((*C.struct_dm_task)(task)))
}
func dmTaskAddTargetFct(task *cdmTask,
start, size uint64, ttype, params string) int {
Cttype := C.CString(ttype)
defer free(Cttype)
Cparams := C.CString(params)
defer free(Cparams)
return int(C.dm_task_add_target((*C.struct_dm_task)(task), C.uint64_t(start), C.uint64_t(size), Cttype, Cparams))
}
func dmTaskGetDepsFct(task *cdmTask) *Deps {
Cdeps := C.dm_task_get_deps((*C.struct_dm_task)(task))
if Cdeps == nil {
return nil
}
// golang issue: https://github.com/golang/go/issues/11925
hdr := reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(uintptr(unsafe.Pointer(Cdeps)) + unsafe.Sizeof(*Cdeps))),
Len: int(Cdeps.count),
Cap: int(Cdeps.count),
}
devices := *(*[]C.uint64_t)(unsafe.Pointer(&hdr))
deps := &Deps{
Count: uint32(Cdeps.count),
Filler: uint32(Cdeps.filler),
}
for _, device := range devices {
deps.Device = append(deps.Device, uint64(device))
}
return deps
}
func dmTaskGetInfoFct(task *cdmTask, info *Info) int {
Cinfo := C.struct_dm_info{}
defer func() {
info.Exists = int(Cinfo.exists)
info.Suspended = int(Cinfo.suspended)
info.LiveTable = int(Cinfo.live_table)
info.InactiveTable = int(Cinfo.inactive_table)
info.OpenCount = int32(Cinfo.open_count)
info.EventNr = uint32(Cinfo.event_nr)
info.Major = uint32(Cinfo.major)
info.Minor = uint32(Cinfo.minor)
info.ReadOnly = int(Cinfo.read_only)
info.TargetCount = int32(Cinfo.target_count)
}()
return int(C.dm_task_get_info((*C.struct_dm_task)(task), &Cinfo))
}
func dmTaskGetDriverVersionFct(task *cdmTask) string {
buffer := C.malloc(128)
defer C.free(buffer)
res := C.dm_task_get_driver_version((*C.struct_dm_task)(task), (*C.char)(buffer), 128)
if res == 0 {
return ""
}
return C.GoString((*C.char)(buffer))
}
func dmGetNextTargetFct(task *cdmTask, next unsafe.Pointer, start, length *uint64, target, params *string) unsafe.Pointer {
var (
Cstart, Clength C.uint64_t
CtargetType, Cparams *C.char
)
defer func() {
*start = uint64(Cstart)
*length = uint64(Clength)
*target = C.GoString(CtargetType)
*params = C.GoString(Cparams)
}()
nextp := C.dm_get_next_target((*C.struct_dm_task)(task), next, &Cstart, &Clength, &CtargetType, &Cparams)
return nextp
}
func dmUdevSetSyncSupportFct(syncWithUdev int) {
(C.dm_udev_set_sync_support(C.int(syncWithUdev)))
}
func dmUdevGetSyncSupportFct() int {
return int(C.dm_udev_get_sync_support())
}
func dmUdevWaitFct(cookie uint) int {
return int(C.dm_udev_wait(C.uint32_t(cookie)))
}
func dmCookieSupportedFct() int {
return int(C.dm_cookie_supported())
}
func dmLogInitVerboseFct(level int) {
C.dm_log_init_verbose(C.int(level))
}
func logWithErrnoInitFct() {
C.log_with_errno_init()
}
func dmSetDevDirFct(dir string) int {
Cdir := C.CString(dir)
defer free(Cdir)
return int(C.dm_set_dev_dir(Cdir))
}
func dmGetLibraryVersionFct(version *string) int {
buffer := C.CString(string(make([]byte, 128)))
defer free(buffer)
defer func() {
*version = C.GoString(buffer)
}()
return int(C.dm_get_library_version(buffer, 128))
}

34
vendor/github.com/containers/storage/pkg/devicemapper/devmapper_wrapper_deferred_remove.go generated vendored Normal file
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@ -0,0 +1,34 @@
// +build linux,!libdm_no_deferred_remove
package devicemapper
/*
#cgo LDFLAGS: -L. -ldevmapper
#include <libdevmapper.h>
*/
import "C"
// LibraryDeferredRemovalSupport is supported when statically linked.
const LibraryDeferredRemovalSupport = true
func dmTaskDeferredRemoveFct(task *cdmTask) int {
return int(C.dm_task_deferred_remove((*C.struct_dm_task)(task)))
}
func dmTaskGetInfoWithDeferredFct(task *cdmTask, info *Info) int {
Cinfo := C.struct_dm_info{}
defer func() {
info.Exists = int(Cinfo.exists)
info.Suspended = int(Cinfo.suspended)
info.LiveTable = int(Cinfo.live_table)
info.InactiveTable = int(Cinfo.inactive_table)
info.OpenCount = int32(Cinfo.open_count)
info.EventNr = uint32(Cinfo.event_nr)
info.Major = uint32(Cinfo.major)
info.Minor = uint32(Cinfo.minor)
info.ReadOnly = int(Cinfo.read_only)
info.TargetCount = int32(Cinfo.target_count)
info.DeferredRemove = int(Cinfo.deferred_remove)
}()
return int(C.dm_task_get_info((*C.struct_dm_task)(task), &Cinfo))
}

15
vendor/github.com/containers/storage/pkg/devicemapper/devmapper_wrapper_no_deferred_remove.go generated vendored Normal file
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@ -0,0 +1,15 @@
// +build linux,libdm_no_deferred_remove
package devicemapper
// LibraryDeferredRemovalsupport is not supported when statically linked.
const LibraryDeferredRemovalSupport = false
func dmTaskDeferredRemoveFct(task *cdmTask) int {
// Error. Nobody should be calling it.
return -1
}
func dmTaskGetInfoWithDeferredFct(task *cdmTask, info *Info) int {
return -1
}

27
vendor/github.com/containers/storage/pkg/devicemapper/ioctl.go generated vendored Normal file
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@ -0,0 +1,27 @@
// +build linux
package devicemapper
import (
"syscall"
"unsafe"
)
func ioctlBlkGetSize64(fd uintptr) (int64, error) {
var size int64
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, BlkGetSize64, uintptr(unsafe.Pointer(&size))); err != 0 {
return 0, err
}
return size, nil
}
func ioctlBlkDiscard(fd uintptr, offset, length uint64) error {
var r [2]uint64
r[0] = offset
r[1] = length
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, BlkDiscard, uintptr(unsafe.Pointer(&r[0]))); err != 0 {
return err
}
return nil
}

11
vendor/github.com/containers/storage/pkg/devicemapper/log.go generated vendored Normal file
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@ -0,0 +1,11 @@
package devicemapper
// definitions from lvm2 lib/log/log.h
const (
LogLevelFatal = 2 + iota // _LOG_FATAL
LogLevelErr // _LOG_ERR
LogLevelWarn // _LOG_WARN
LogLevelNotice // _LOG_NOTICE
LogLevelInfo // _LOG_INFO
LogLevelDebug // _LOG_DEBUG
)

26
vendor/github.com/containers/storage/pkg/directory/directory.go generated vendored Normal file
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@ -0,0 +1,26 @@
package directory
import (
"io/ioutil"
"os"
"path/filepath"
)
// MoveToSubdir moves all contents of a directory to a subdirectory underneath the original path
func MoveToSubdir(oldpath, subdir string) error {
infos, err := ioutil.ReadDir(oldpath)
if err != nil {
return err
}
for _, info := range infos {
if info.Name() != subdir {
oldName := filepath.Join(oldpath, info.Name())
newName := filepath.Join(oldpath, subdir, info.Name())
if err := os.Rename(oldName, newName); err != nil {
return err
}
}
}
return nil
}

48
vendor/github.com/containers/storage/pkg/directory/directory_unix.go generated vendored Normal file
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@ -0,0 +1,48 @@
// +build linux freebsd solaris
package directory
import (
"os"
"path/filepath"
"syscall"
)
// Size walks a directory tree and returns its total size in bytes.
func Size(dir string) (size int64, err error) {
data := make(map[uint64]struct{})
err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, err error) error {
if err != nil {
// if dir does not exist, Size() returns the error.
// if dir/x disappeared while walking, Size() ignores dir/x.
if os.IsNotExist(err) && d != dir {
return nil
}
return err
}
// Ignore directory sizes
if fileInfo == nil {
return nil
}
s := fileInfo.Size()
if fileInfo.IsDir() || s == 0 {
return nil
}
// Check inode to handle hard links correctly
inode := fileInfo.Sys().(*syscall.Stat_t).Ino
// inode is not a uint64 on all platforms. Cast it to avoid issues.
if _, exists := data[uint64(inode)]; exists {
return nil
}
// inode is not a uint64 on all platforms. Cast it to avoid issues.
data[uint64(inode)] = struct{}{}
size += s
return nil
})
return
}

37
vendor/github.com/containers/storage/pkg/directory/directory_windows.go generated vendored Normal file
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@ -0,0 +1,37 @@
// +build windows
package directory
import (
"os"
"path/filepath"
)
// Size walks a directory tree and returns its total size in bytes.
func Size(dir string) (size int64, err error) {
err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, err error) error {
if err != nil {
// if dir does not exist, Size() returns the error.
// if dir/x disappeared while walking, Size() ignores dir/x.
if os.IsNotExist(err) && d != dir {
return nil
}
return err
}
// Ignore directory sizes
if fileInfo == nil {
return nil
}
s := fileInfo.Size()
if fileInfo.IsDir() || s == 0 {
return nil
}
size += s
return nil
})
return
}

283
vendor/github.com/containers/storage/pkg/fileutils/fileutils.go generated vendored Normal file
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@ -0,0 +1,283 @@
package fileutils
import (
"errors"
"fmt"
"io"
"os"
"path/filepath"
"regexp"
"strings"
"text/scanner"
"github.com/Sirupsen/logrus"
)
// exclusion returns true if the specified pattern is an exclusion
func exclusion(pattern string) bool {
return pattern[0] == '!'
}
// empty returns true if the specified pattern is empty
func empty(pattern string) bool {
return pattern == ""
}
// CleanPatterns takes a slice of patterns returns a new
// slice of patterns cleaned with filepath.Clean, stripped
// of any empty patterns and lets the caller know whether the
// slice contains any exception patterns (prefixed with !).
func CleanPatterns(patterns []string) ([]string, [][]string, bool, error) {
// Loop over exclusion patterns and:
// 1. Clean them up.
// 2. Indicate whether we are dealing with any exception rules.
// 3. Error if we see a single exclusion marker on it's own (!).
cleanedPatterns := []string{}
patternDirs := [][]string{}
exceptions := false
for _, pattern := range patterns {
// Eliminate leading and trailing whitespace.
pattern = strings.TrimSpace(pattern)
if empty(pattern) {
continue
}
if exclusion(pattern) {
if len(pattern) == 1 {
return nil, nil, false, errors.New("Illegal exclusion pattern: !")
}
exceptions = true
}
pattern = filepath.Clean(pattern)
cleanedPatterns = append(cleanedPatterns, pattern)
if exclusion(pattern) {
pattern = pattern[1:]
}
patternDirs = append(patternDirs, strings.Split(pattern, string(os.PathSeparator)))
}
return cleanedPatterns, patternDirs, exceptions, nil
}
// Matches returns true if file matches any of the patterns
// and isn't excluded by any of the subsequent patterns.
func Matches(file string, patterns []string) (bool, error) {
file = filepath.Clean(file)
if file == "." {
// Don't let them exclude everything, kind of silly.
return false, nil
}
patterns, patDirs, _, err := CleanPatterns(patterns)
if err != nil {
return false, err
}
return OptimizedMatches(file, patterns, patDirs)
}
// OptimizedMatches is basically the same as fileutils.Matches() but optimized for archive.go.
// It will assume that the inputs have been preprocessed and therefore the function
// doesn't need to do as much error checking and clean-up. This was done to avoid
// repeating these steps on each file being checked during the archive process.
// The more generic fileutils.Matches() can't make these assumptions.
func OptimizedMatches(file string, patterns []string, patDirs [][]string) (bool, error) {
matched := false
file = filepath.FromSlash(file)
parentPath := filepath.Dir(file)
parentPathDirs := strings.Split(parentPath, string(os.PathSeparator))
for i, pattern := range patterns {
negative := false
if exclusion(pattern) {
negative = true
pattern = pattern[1:]
}
match, err := regexpMatch(pattern, file)
if err != nil {
return false, fmt.Errorf("Error in pattern (%s): %s", pattern, err)
}
if !match && parentPath != "." {
// Check to see if the pattern matches one of our parent dirs.
if len(patDirs[i]) <= len(parentPathDirs) {
match, _ = regexpMatch(strings.Join(patDirs[i], string(os.PathSeparator)),
strings.Join(parentPathDirs[:len(patDirs[i])], string(os.PathSeparator)))
}
}
if match {
matched = !negative
}
}
if matched {
logrus.Debugf("Skipping excluded path: %s", file)
}
return matched, nil
}
// regexpMatch tries to match the logic of filepath.Match but
// does so using regexp logic. We do this so that we can expand the
// wildcard set to include other things, like "**" to mean any number
// of directories. This means that we should be backwards compatible
// with filepath.Match(). We'll end up supporting more stuff, due to
// the fact that we're using regexp, but that's ok - it does no harm.
//
// As per the comment in golangs filepath.Match, on Windows, escaping
// is disabled. Instead, '\\' is treated as path separator.
func regexpMatch(pattern, path string) (bool, error) {
regStr := "^"
// Do some syntax checking on the pattern.
// filepath's Match() has some really weird rules that are inconsistent
// so instead of trying to dup their logic, just call Match() for its
// error state and if there is an error in the pattern return it.
// If this becomes an issue we can remove this since its really only
// needed in the error (syntax) case - which isn't really critical.
if _, err := filepath.Match(pattern, path); err != nil {
return false, err
}
// Go through the pattern and convert it to a regexp.
// We use a scanner so we can support utf-8 chars.
var scan scanner.Scanner
scan.Init(strings.NewReader(pattern))
sl := string(os.PathSeparator)
escSL := sl
if sl == `\` {
escSL += `\`
}
for scan.Peek() != scanner.EOF {
ch := scan.Next()
if ch == '*' {
if scan.Peek() == '*' {
// is some flavor of "**"
scan.Next()
if scan.Peek() == scanner.EOF {
// is "**EOF" - to align with .gitignore just accept all
regStr += ".*"
} else {
// is "**"
regStr += "((.*" + escSL + ")|([^" + escSL + "]*))"
}
// Treat **/ as ** so eat the "/"
if string(scan.Peek()) == sl {
scan.Next()
}
} else {
// is "*" so map it to anything but "/"
regStr += "[^" + escSL + "]*"
}
} else if ch == '?' {
// "?" is any char except "/"
regStr += "[^" + escSL + "]"
} else if strings.Index(".$", string(ch)) != -1 {
// Escape some regexp special chars that have no meaning
// in golang's filepath.Match
regStr += `\` + string(ch)
} else if ch == '\\' {
// escape next char. Note that a trailing \ in the pattern
// will be left alone (but need to escape it)
if sl == `\` {
// On windows map "\" to "\\", meaning an escaped backslash,
// and then just continue because filepath.Match on
// Windows doesn't allow escaping at all
regStr += escSL
continue
}
if scan.Peek() != scanner.EOF {
regStr += `\` + string(scan.Next())
} else {
regStr += `\`
}
} else {
regStr += string(ch)
}
}
regStr += "$"
res, err := regexp.MatchString(regStr, path)
// Map regexp's error to filepath's so no one knows we're not using filepath
if err != nil {
err = filepath.ErrBadPattern
}
return res, err
}
// CopyFile copies from src to dst until either EOF is reached
// on src or an error occurs. It verifies src exists and removes
// the dst if it exists.
func CopyFile(src, dst string) (int64, error) {
cleanSrc := filepath.Clean(src)
cleanDst := filepath.Clean(dst)
if cleanSrc == cleanDst {
return 0, nil
}
sf, err := os.Open(cleanSrc)
if err != nil {
return 0, err
}
defer sf.Close()
if err := os.Remove(cleanDst); err != nil && !os.IsNotExist(err) {
return 0, err
}
df, err := os.Create(cleanDst)
if err != nil {
return 0, err
}
defer df.Close()
return io.Copy(df, sf)
}
// ReadSymlinkedDirectory returns the target directory of a symlink.
// The target of the symbolic link may not be a file.
func ReadSymlinkedDirectory(path string) (string, error) {
var realPath string
var err error
if realPath, err = filepath.Abs(path); err != nil {
return "", fmt.Errorf("unable to get absolute path for %s: %s", path, err)
}
if realPath, err = filepath.EvalSymlinks(realPath); err != nil {
return "", fmt.Errorf("failed to canonicalise path for %s: %s", path, err)
}
realPathInfo, err := os.Stat(realPath)
if err != nil {
return "", fmt.Errorf("failed to stat target '%s' of '%s': %s", realPath, path, err)
}
if !realPathInfo.Mode().IsDir() {
return "", fmt.Errorf("canonical path points to a file '%s'", realPath)
}
return realPath, nil
}
// CreateIfNotExists creates a file or a directory only if it does not already exist.
func CreateIfNotExists(path string, isDir bool) error {
if _, err := os.Stat(path); err != nil {
if os.IsNotExist(err) {
if isDir {
return os.MkdirAll(path, 0755)
}
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return err
}
f, err := os.OpenFile(path, os.O_CREATE, 0755)
if err != nil {
return err
}
f.Close()
}
}
return nil
}

27
vendor/github.com/containers/storage/pkg/fileutils/fileutils_darwin.go generated vendored Normal file
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@ -0,0 +1,27 @@
package fileutils
import (
"os"
"os/exec"
"strconv"
"strings"
)
// GetTotalUsedFds returns the number of used File Descriptors by
// executing `lsof -p PID`
func GetTotalUsedFds() int {
pid := os.Getpid()
cmd := exec.Command("lsof", "-p", strconv.Itoa(pid))
output, err := cmd.CombinedOutput()
if err != nil {
return -1
}
outputStr := strings.TrimSpace(string(output))
fds := strings.Split(outputStr, "\n")
return len(fds) - 1
}

7
vendor/github.com/containers/storage/pkg/fileutils/fileutils_solaris.go generated vendored Normal file
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@ -0,0 +1,7 @@
package fileutils
// GetTotalUsedFds Returns the number of used File Descriptors.
// On Solaris these limits are per process and not systemwide
func GetTotalUsedFds() int {
return -1
}

22
vendor/github.com/containers/storage/pkg/fileutils/fileutils_unix.go generated vendored Normal file
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@ -0,0 +1,22 @@
// +build linux freebsd
package fileutils
import (
"fmt"
"io/ioutil"
"os"
"github.com/Sirupsen/logrus"
)
// GetTotalUsedFds Returns the number of used File Descriptors by
// reading it via /proc filesystem.
func GetTotalUsedFds() int {
if fds, err := ioutil.ReadDir(fmt.Sprintf("/proc/%d/fd", os.Getpid())); err != nil {
logrus.Errorf("Error opening /proc/%d/fd: %s", os.Getpid(), err)
} else {
return len(fds)
}
return -1
}

7
vendor/github.com/containers/storage/pkg/fileutils/fileutils_windows.go generated vendored Normal file
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@ -0,0 +1,7 @@
package fileutils
// GetTotalUsedFds Returns the number of used File Descriptors. Not supported
// on Windows.
func GetTotalUsedFds() int {
return -1
}

39
vendor/github.com/containers/storage/pkg/homedir/homedir.go generated vendored Normal file
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@ -0,0 +1,39 @@
package homedir
import (
"os"
"runtime"
"github.com/opencontainers/runc/libcontainer/user"
)
// Key returns the env var name for the user's home dir based on
// the platform being run on
func Key() string {
if runtime.GOOS == "windows" {
return "USERPROFILE"
}
return "HOME"
}
// Get returns the home directory of the current user with the help of
// environment variables depending on the target operating system.
// Returned path should be used with "path/filepath" to form new paths.
func Get() string {
home := os.Getenv(Key())
if home == "" && runtime.GOOS != "windows" {
if u, err := user.CurrentUser(); err == nil {
return u.Home
}
}
return home
}
// GetShortcutString returns the string that is shortcut to user's home directory
// in the native shell of the platform running on.
func GetShortcutString() string {
if runtime.GOOS == "windows" {
return "%USERPROFILE%" // be careful while using in format functions
}
return "~"
}

197
vendor/github.com/containers/storage/pkg/idtools/idtools.go generated vendored Normal file
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@ -0,0 +1,197 @@
package idtools
import (
"bufio"
"fmt"
"os"
"sort"
"strconv"
"strings"
)
// IDMap contains a single entry for user namespace range remapping. An array
// of IDMap entries represents the structure that will be provided to the Linux
// kernel for creating a user namespace.
type IDMap struct {
ContainerID int `json:"container_id"`
HostID int `json:"host_id"`
Size int `json:"size"`
}
type subIDRange struct {
Start int
Length int
}
type ranges []subIDRange
func (e ranges) Len() int { return len(e) }
func (e ranges) Swap(i, j int) { e[i], e[j] = e[j], e[i] }
func (e ranges) Less(i, j int) bool { return e[i].Start < e[j].Start }
const (
subuidFileName string = "/etc/subuid"
subgidFileName string = "/etc/subgid"
)
// MkdirAllAs creates a directory (include any along the path) and then modifies
// ownership to the requested uid/gid. If the directory already exists, this
// function will still change ownership to the requested uid/gid pair.
func MkdirAllAs(path string, mode os.FileMode, ownerUID, ownerGID int) error {
return mkdirAs(path, mode, ownerUID, ownerGID, true, true)
}
// MkdirAllNewAs creates a directory (include any along the path) and then modifies
// ownership ONLY of newly created directories to the requested uid/gid. If the
// directories along the path exist, no change of ownership will be performed
func MkdirAllNewAs(path string, mode os.FileMode, ownerUID, ownerGID int) error {
return mkdirAs(path, mode, ownerUID, ownerGID, true, false)
}
// MkdirAs creates a directory and then modifies ownership to the requested uid/gid.
// If the directory already exists, this function still changes ownership
func MkdirAs(path string, mode os.FileMode, ownerUID, ownerGID int) error {
return mkdirAs(path, mode, ownerUID, ownerGID, false, true)
}
// GetRootUIDGID retrieves the remapped root uid/gid pair from the set of maps.
// If the maps are empty, then the root uid/gid will default to "real" 0/0
func GetRootUIDGID(uidMap, gidMap []IDMap) (int, int, error) {
var uid, gid int
if uidMap != nil {
xUID, err := ToHost(0, uidMap)
if err != nil {
return -1, -1, err
}
uid = xUID
}
if gidMap != nil {
xGID, err := ToHost(0, gidMap)
if err != nil {
return -1, -1, err
}
gid = xGID
}
return uid, gid, nil
}
// ToContainer takes an id mapping, and uses it to translate a
// host ID to the remapped ID. If no map is provided, then the translation
// assumes a 1-to-1 mapping and returns the passed in id
func ToContainer(hostID int, idMap []IDMap) (int, error) {
if idMap == nil {
return hostID, nil
}
for _, m := range idMap {
if (hostID >= m.HostID) && (hostID <= (m.HostID + m.Size - 1)) {
contID := m.ContainerID + (hostID - m.HostID)
return contID, nil
}
}
return -1, fmt.Errorf("Host ID %d cannot be mapped to a container ID", hostID)
}
// ToHost takes an id mapping and a remapped ID, and translates the
// ID to the mapped host ID. If no map is provided, then the translation
// assumes a 1-to-1 mapping and returns the passed in id #
func ToHost(contID int, idMap []IDMap) (int, error) {
if idMap == nil {
return contID, nil
}
for _, m := range idMap {
if (contID >= m.ContainerID) && (contID <= (m.ContainerID + m.Size - 1)) {
hostID := m.HostID + (contID - m.ContainerID)
return hostID, nil
}
}
return -1, fmt.Errorf("Container ID %d cannot be mapped to a host ID", contID)
}
// CreateIDMappings takes a requested user and group name and
// using the data from /etc/sub{uid,gid} ranges, creates the
// proper uid and gid remapping ranges for that user/group pair
func CreateIDMappings(username, groupname string) ([]IDMap, []IDMap, error) {
subuidRanges, err := parseSubuid(username)
if err != nil {
return nil, nil, err
}
subgidRanges, err := parseSubgid(groupname)
if err != nil {
return nil, nil, err
}
if len(subuidRanges) == 0 {
return nil, nil, fmt.Errorf("No subuid ranges found for user %q", username)
}
if len(subgidRanges) == 0 {
return nil, nil, fmt.Errorf("No subgid ranges found for group %q", groupname)
}
return createIDMap(subuidRanges), createIDMap(subgidRanges), nil
}
func createIDMap(subidRanges ranges) []IDMap {
idMap := []IDMap{}
// sort the ranges by lowest ID first
sort.Sort(subidRanges)
containerID := 0
for _, idrange := range subidRanges {
idMap = append(idMap, IDMap{
ContainerID: containerID,
HostID: idrange.Start,
Size: idrange.Length,
})
containerID = containerID + idrange.Length
}
return idMap
}
func parseSubuid(username string) (ranges, error) {
return parseSubidFile(subuidFileName, username)
}
func parseSubgid(username string) (ranges, error) {
return parseSubidFile(subgidFileName, username)
}
// parseSubidFile will read the appropriate file (/etc/subuid or /etc/subgid)
// and return all found ranges for a specified username. If the special value
// "ALL" is supplied for username, then all ranges in the file will be returned
func parseSubidFile(path, username string) (ranges, error) {
var rangeList ranges
subidFile, err := os.Open(path)
if err != nil {
return rangeList, err
}
defer subidFile.Close()
s := bufio.NewScanner(subidFile)
for s.Scan() {
if err := s.Err(); err != nil {
return rangeList, err
}
text := strings.TrimSpace(s.Text())
if text == "" || strings.HasPrefix(text, "#") {
continue
}
parts := strings.Split(text, ":")
if len(parts) != 3 {
return rangeList, fmt.Errorf("Cannot parse subuid/gid information: Format not correct for %s file", path)
}
if parts[0] == username || username == "ALL" {
startid, err := strconv.Atoi(parts[1])
if err != nil {
return rangeList, fmt.Errorf("String to int conversion failed during subuid/gid parsing of %s: %v", path, err)
}
length, err := strconv.Atoi(parts[2])
if err != nil {
return rangeList, fmt.Errorf("String to int conversion failed during subuid/gid parsing of %s: %v", path, err)
}
rangeList = append(rangeList, subIDRange{startid, length})
}
}
return rangeList, nil
}

60
vendor/github.com/containers/storage/pkg/idtools/idtools_unix.go generated vendored Normal file
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@ -0,0 +1,60 @@
// +build !windows
package idtools
import (
"os"
"path/filepath"
"github.com/containers/storage/pkg/system"
)
func mkdirAs(path string, mode os.FileMode, ownerUID, ownerGID int, mkAll, chownExisting bool) error {
// make an array containing the original path asked for, plus (for mkAll == true)
// all path components leading up to the complete path that don't exist before we MkdirAll
// so that we can chown all of them properly at the end. If chownExisting is false, we won't
// chown the full directory path if it exists
var paths []string
if _, err := os.Stat(path); err != nil && os.IsNotExist(err) {
paths = []string{path}
} else if err == nil && chownExisting {
if err := os.Chown(path, ownerUID, ownerGID); err != nil {
return err
}
// short-circuit--we were called with an existing directory and chown was requested
return nil
} else if err == nil {
// nothing to do; directory path fully exists already and chown was NOT requested
return nil
}
if mkAll {
// walk back to "/" looking for directories which do not exist
// and add them to the paths array for chown after creation
dirPath := path
for {
dirPath = filepath.Dir(dirPath)
if dirPath == "/" {
break
}
if _, err := os.Stat(dirPath); err != nil && os.IsNotExist(err) {
paths = append(paths, dirPath)
}
}
if err := system.MkdirAll(path, mode); err != nil && !os.IsExist(err) {
return err
}
} else {
if err := os.Mkdir(path, mode); err != nil && !os.IsExist(err) {
return err
}
}
// even if it existed, we will chown the requested path + any subpaths that
// didn't exist when we called MkdirAll
for _, pathComponent := range paths {
if err := os.Chown(pathComponent, ownerUID, ownerGID); err != nil {
return err
}
}
return nil
}

18
vendor/github.com/containers/storage/pkg/idtools/idtools_windows.go generated vendored Normal file
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@ -0,0 +1,18 @@
// +build windows
package idtools
import (
"os"
"github.com/containers/storage/pkg/system"
)
// Platforms such as Windows do not support the UID/GID concept. So make this
// just a wrapper around system.MkdirAll.
func mkdirAs(path string, mode os.FileMode, ownerUID, ownerGID int, mkAll, chownExisting bool) error {
if err := system.MkdirAll(path, mode); err != nil && !os.IsExist(err) {
return err
}
return nil
}

188
vendor/github.com/containers/storage/pkg/idtools/usergroupadd_linux.go generated vendored Normal file
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@ -0,0 +1,188 @@
package idtools
import (
"fmt"
"os/exec"
"path/filepath"
"regexp"
"sort"
"strconv"
"strings"
"sync"
)
// add a user and/or group to Linux /etc/passwd, /etc/group using standard
// Linux distribution commands:
// adduser --system --shell /bin/false --disabled-login --disabled-password --no-create-home --group <username>
// useradd -r -s /bin/false <username>
var (
once sync.Once
userCommand string
cmdTemplates = map[string]string{
"adduser": "--system --shell /bin/false --no-create-home --disabled-login --disabled-password --group %s",
"useradd": "-r -s /bin/false %s",
"usermod": "-%s %d-%d %s",
}
idOutRegexp = regexp.MustCompile(`uid=([0-9]+).*gid=([0-9]+)`)
// default length for a UID/GID subordinate range
defaultRangeLen = 65536
defaultRangeStart = 100000
userMod = "usermod"
)
func resolveBinary(binname string) (string, error) {
binaryPath, err := exec.LookPath(binname)
if err != nil {
return "", err
}
resolvedPath, err := filepath.EvalSymlinks(binaryPath)
if err != nil {
return "", err
}
//only return no error if the final resolved binary basename
//matches what was searched for
if filepath.Base(resolvedPath) == binname {
return resolvedPath, nil
}
return "", fmt.Errorf("Binary %q does not resolve to a binary of that name in $PATH (%q)", binname, resolvedPath)
}
// AddNamespaceRangesUser takes a username and uses the standard system
// utility to create a system user/group pair used to hold the
// /etc/sub{uid,gid} ranges which will be used for user namespace
// mapping ranges in containers.
func AddNamespaceRangesUser(name string) (int, int, error) {
if err := addUser(name); err != nil {
return -1, -1, fmt.Errorf("Error adding user %q: %v", name, err)
}
// Query the system for the created uid and gid pair
out, err := execCmd("id", name)
if err != nil {
return -1, -1, fmt.Errorf("Error trying to find uid/gid for new user %q: %v", name, err)
}
matches := idOutRegexp.FindStringSubmatch(strings.TrimSpace(string(out)))
if len(matches) != 3 {
return -1, -1, fmt.Errorf("Can't find uid, gid from `id` output: %q", string(out))
}
uid, err := strconv.Atoi(matches[1])
if err != nil {
return -1, -1, fmt.Errorf("Can't convert found uid (%s) to int: %v", matches[1], err)
}
gid, err := strconv.Atoi(matches[2])
if err != nil {
return -1, -1, fmt.Errorf("Can't convert found gid (%s) to int: %v", matches[2], err)
}
// Now we need to create the subuid/subgid ranges for our new user/group (system users
// do not get auto-created ranges in subuid/subgid)
if err := createSubordinateRanges(name); err != nil {
return -1, -1, fmt.Errorf("Couldn't create subordinate ID ranges: %v", err)
}
return uid, gid, nil
}
func addUser(userName string) error {
once.Do(func() {
// set up which commands are used for adding users/groups dependent on distro
if _, err := resolveBinary("adduser"); err == nil {
userCommand = "adduser"
} else if _, err := resolveBinary("useradd"); err == nil {
userCommand = "useradd"
}
})
if userCommand == "" {
return fmt.Errorf("Cannot add user; no useradd/adduser binary found")
}
args := fmt.Sprintf(cmdTemplates[userCommand], userName)
out, err := execCmd(userCommand, args)
if err != nil {
return fmt.Errorf("Failed to add user with error: %v; output: %q", err, string(out))
}
return nil
}
func createSubordinateRanges(name string) error {
// first, we should verify that ranges weren't automatically created
// by the distro tooling
ranges, err := parseSubuid(name)
if err != nil {
return fmt.Errorf("Error while looking for subuid ranges for user %q: %v", name, err)
}
if len(ranges) == 0 {
// no UID ranges; let's create one
startID, err := findNextUIDRange()
if err != nil {
return fmt.Errorf("Can't find available subuid range: %v", err)
}
out, err := execCmd(userMod, fmt.Sprintf(cmdTemplates[userMod], "v", startID, startID+defaultRangeLen-1, name))
if err != nil {
return fmt.Errorf("Unable to add subuid range to user: %q; output: %s, err: %v", name, out, err)
}
}
ranges, err = parseSubgid(name)
if err != nil {
return fmt.Errorf("Error while looking for subgid ranges for user %q: %v", name, err)
}
if len(ranges) == 0 {
// no GID ranges; let's create one
startID, err := findNextGIDRange()
if err != nil {
return fmt.Errorf("Can't find available subgid range: %v", err)
}
out, err := execCmd(userMod, fmt.Sprintf(cmdTemplates[userMod], "w", startID, startID+defaultRangeLen-1, name))
if err != nil {
return fmt.Errorf("Unable to add subgid range to user: %q; output: %s, err: %v", name, out, err)
}
}
return nil
}
func findNextUIDRange() (int, error) {
ranges, err := parseSubuid("ALL")
if err != nil {
return -1, fmt.Errorf("Couldn't parse all ranges in /etc/subuid file: %v", err)
}
sort.Sort(ranges)
return findNextRangeStart(ranges)
}
func findNextGIDRange() (int, error) {
ranges, err := parseSubgid("ALL")
if err != nil {
return -1, fmt.Errorf("Couldn't parse all ranges in /etc/subgid file: %v", err)
}
sort.Sort(ranges)
return findNextRangeStart(ranges)
}
func findNextRangeStart(rangeList ranges) (int, error) {
startID := defaultRangeStart
for _, arange := range rangeList {
if wouldOverlap(arange, startID) {
startID = arange.Start + arange.Length
}
}
return startID, nil
}
func wouldOverlap(arange subIDRange, ID int) bool {
low := ID
high := ID + defaultRangeLen
if (low >= arange.Start && low <= arange.Start+arange.Length) ||
(high <= arange.Start+arange.Length && high >= arange.Start) {
return true
}
return false
}
func execCmd(cmd, args string) ([]byte, error) {
execCmd := exec.Command(cmd, strings.Split(args, " ")...)
return execCmd.CombinedOutput()
}

12
vendor/github.com/containers/storage/pkg/idtools/usergroupadd_unsupported.go generated vendored Normal file
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@ -0,0 +1,12 @@
// +build !linux
package idtools
import "fmt"
// AddNamespaceRangesUser takes a name and finds an unused uid, gid pair
// and calls the appropriate helper function to add the group and then
// the user to the group in /etc/group and /etc/passwd respectively.
func AddNamespaceRangesUser(name string) (int, int, error) {
return -1, -1, fmt.Errorf("No support for adding users or groups on this OS")
}

51
vendor/github.com/containers/storage/pkg/ioutils/buffer.go generated vendored Normal file
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@ -0,0 +1,51 @@
package ioutils
import (
"errors"
"io"
)
var errBufferFull = errors.New("buffer is full")
type fixedBuffer struct {
buf []byte
pos int
lastRead int
}
func (b *fixedBuffer) Write(p []byte) (int, error) {
n := copy(b.buf[b.pos:cap(b.buf)], p)
b.pos += n
if n < len(p) {
if b.pos == cap(b.buf) {
return n, errBufferFull
}
return n, io.ErrShortWrite
}
return n, nil
}
func (b *fixedBuffer) Read(p []byte) (int, error) {
n := copy(p, b.buf[b.lastRead:b.pos])
b.lastRead += n
return n, nil
}
func (b *fixedBuffer) Len() int {
return b.pos - b.lastRead
}
func (b *fixedBuffer) Cap() int {
return cap(b.buf)
}
func (b *fixedBuffer) Reset() {
b.pos = 0
b.lastRead = 0
b.buf = b.buf[:0]
}
func (b *fixedBuffer) String() string {
return string(b.buf[b.lastRead:b.pos])
}

22
vendor/github.com/containers/storage/pkg/ioutils/fmt.go generated vendored Normal file
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@ -0,0 +1,22 @@
package ioutils
import (
"fmt"
"io"
)
// FprintfIfNotEmpty prints the string value if it's not empty
func FprintfIfNotEmpty(w io.Writer, format, value string) (int, error) {
if value != "" {
return fmt.Fprintf(w, format, value)
}
return 0, nil
}
// FprintfIfTrue prints the boolean value if it's true
func FprintfIfTrue(w io.Writer, format string, ok bool) (int, error) {
if ok {
return fmt.Fprintf(w, format, ok)
}
return 0, nil
}

82
vendor/github.com/containers/storage/pkg/ioutils/fswriters.go generated vendored Normal file
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@ -0,0 +1,82 @@
package ioutils
import (
"io"
"io/ioutil"
"os"
"path/filepath"
)
// NewAtomicFileWriter returns WriteCloser so that writing to it writes to a
// temporary file and closing it atomically changes the temporary file to
// destination path. Writing and closing concurrently is not allowed.
func NewAtomicFileWriter(filename string, perm os.FileMode) (io.WriteCloser, error) {
f, err := ioutil.TempFile(filepath.Dir(filename), ".tmp-"+filepath.Base(filename))
if err != nil {
return nil, err
}
abspath, err := filepath.Abs(filename)
if err != nil {
return nil, err
}
return &atomicFileWriter{
f: f,
fn: abspath,
perm: perm,
}, nil
}
// AtomicWriteFile atomically writes data to a file named by filename.
func AtomicWriteFile(filename string, data []byte, perm os.FileMode) error {
f, err := NewAtomicFileWriter(filename, perm)
if err != nil {
return err
}
n, err := f.Write(data)
if err == nil && n < len(data) {
err = io.ErrShortWrite
f.(*atomicFileWriter).writeErr = err
}
if err1 := f.Close(); err == nil {
err = err1
}
return err
}
type atomicFileWriter struct {
f *os.File
fn string
writeErr error
perm os.FileMode
}
func (w *atomicFileWriter) Write(dt []byte) (int, error) {
n, err := w.f.Write(dt)
if err != nil {
w.writeErr = err
}
return n, err
}
func (w *atomicFileWriter) Close() (retErr error) {
defer func() {
if retErr != nil || w.writeErr != nil {
os.Remove(w.f.Name())
}
}()
if err := w.f.Sync(); err != nil {
w.f.Close()
return err
}
if err := w.f.Close(); err != nil {
return err
}
if err := os.Chmod(w.f.Name(), w.perm); err != nil {
return err
}
if w.writeErr == nil {
return os.Rename(w.f.Name(), w.fn)
}
return nil
}

226
vendor/github.com/containers/storage/pkg/ioutils/multireader.go generated vendored Normal file
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@ -0,0 +1,226 @@
package ioutils
import (
"bytes"
"fmt"
"io"
"os"
)
type pos struct {
idx int
offset int64
}
type multiReadSeeker struct {
readers []io.ReadSeeker
pos *pos
posIdx map[io.ReadSeeker]int
}
func (r *multiReadSeeker) Seek(offset int64, whence int) (int64, error) {
var tmpOffset int64
switch whence {
case os.SEEK_SET:
for i, rdr := range r.readers {
// get size of the current reader
s, err := rdr.Seek(0, os.SEEK_END)
if err != nil {
return -1, err
}
if offset > tmpOffset+s {
if i == len(r.readers)-1 {
rdrOffset := s + (offset - tmpOffset)
if _, err := rdr.Seek(rdrOffset, os.SEEK_SET); err != nil {
return -1, err
}
r.pos = &pos{i, rdrOffset}
return offset, nil
}
tmpOffset += s
continue
}
rdrOffset := offset - tmpOffset
idx := i
rdr.Seek(rdrOffset, os.SEEK_SET)
// make sure all following readers are at 0
for _, rdr := range r.readers[i+1:] {
rdr.Seek(0, os.SEEK_SET)
}
if rdrOffset == s && i != len(r.readers)-1 {
idx++
rdrOffset = 0
}
r.pos = &pos{idx, rdrOffset}
return offset, nil
}
case os.SEEK_END:
for _, rdr := range r.readers {
s, err := rdr.Seek(0, os.SEEK_END)
if err != nil {
return -1, err
}
tmpOffset += s
}
r.Seek(tmpOffset+offset, os.SEEK_SET)
return tmpOffset + offset, nil
case os.SEEK_CUR:
if r.pos == nil {
return r.Seek(offset, os.SEEK_SET)
}
// Just return the current offset
if offset == 0 {
return r.getCurOffset()
}
curOffset, err := r.getCurOffset()
if err != nil {
return -1, err
}
rdr, rdrOffset, err := r.getReaderForOffset(curOffset + offset)
if err != nil {
return -1, err
}
r.pos = &pos{r.posIdx[rdr], rdrOffset}
return curOffset + offset, nil
default:
return -1, fmt.Errorf("Invalid whence: %d", whence)
}
return -1, fmt.Errorf("Error seeking for whence: %d, offset: %d", whence, offset)
}
func (r *multiReadSeeker) getReaderForOffset(offset int64) (io.ReadSeeker, int64, error) {
var rdr io.ReadSeeker
var rdrOffset int64
for i, rdr := range r.readers {
offsetTo, err := r.getOffsetToReader(rdr)
if err != nil {
return nil, -1, err
}
if offsetTo > offset {
rdr = r.readers[i-1]
rdrOffset = offsetTo - offset
break
}
if rdr == r.readers[len(r.readers)-1] {
rdrOffset = offsetTo + offset
break
}
}
return rdr, rdrOffset, nil
}
func (r *multiReadSeeker) getCurOffset() (int64, error) {
var totalSize int64
for _, rdr := range r.readers[:r.pos.idx+1] {
if r.posIdx[rdr] == r.pos.idx {
totalSize += r.pos.offset
break
}
size, err := getReadSeekerSize(rdr)
if err != nil {
return -1, fmt.Errorf("error getting seeker size: %v", err)
}
totalSize += size
}
return totalSize, nil
}
func (r *multiReadSeeker) getOffsetToReader(rdr io.ReadSeeker) (int64, error) {
var offset int64
for _, r := range r.readers {
if r == rdr {
break
}
size, err := getReadSeekerSize(rdr)
if err != nil {
return -1, err
}
offset += size
}
return offset, nil
}
func (r *multiReadSeeker) Read(b []byte) (int, error) {
if r.pos == nil {
r.pos = &pos{0, 0}
}
bCap := int64(cap(b))
buf := bytes.NewBuffer(nil)
var rdr io.ReadSeeker
for _, rdr = range r.readers[r.pos.idx:] {
readBytes, err := io.CopyN(buf, rdr, bCap)
if err != nil && err != io.EOF {
return -1, err
}
bCap -= readBytes
if bCap == 0 {
break
}
}
rdrPos, err := rdr.Seek(0, os.SEEK_CUR)
if err != nil {
return -1, err
}
r.pos = &pos{r.posIdx[rdr], rdrPos}
return buf.Read(b)
}
func getReadSeekerSize(rdr io.ReadSeeker) (int64, error) {
// save the current position
pos, err := rdr.Seek(0, os.SEEK_CUR)
if err != nil {
return -1, err
}
// get the size
size, err := rdr.Seek(0, os.SEEK_END)
if err != nil {
return -1, err
}
// reset the position
if _, err := rdr.Seek(pos, os.SEEK_SET); err != nil {
return -1, err
}
return size, nil
}
// MultiReadSeeker returns a ReadSeeker that's the logical concatenation of the provided
// input readseekers. After calling this method the initial position is set to the
// beginning of the first ReadSeeker. At the end of a ReadSeeker, Read always advances
// to the beginning of the next ReadSeeker and returns EOF at the end of the last ReadSeeker.
// Seek can be used over the sum of lengths of all readseekers.
//
// When a MultiReadSeeker is used, no Read and Seek operations should be made on
// its ReadSeeker components. Also, users should make no assumption on the state
// of individual readseekers while the MultiReadSeeker is used.
func MultiReadSeeker(readers ...io.ReadSeeker) io.ReadSeeker {
if len(readers) == 1 {
return readers[0]
}
idx := make(map[io.ReadSeeker]int)
for i, rdr := range readers {
idx[rdr] = i
}
return &multiReadSeeker{
readers: readers,
posIdx: idx,
}
}

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