6c9628cdb1
* 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>
89 lines
1.7 KiB
Go
89 lines
1.7 KiB
Go
// +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
|
|
}
|