Build and install from GOPATH

* 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>

vendor/github.com/containers/storage/drivers/vfs/driver.go

@@ -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
+}