1 files changed, 95 insertions, 0 deletions
diff --git a/runtime/graphdriver/vfs/driver.go b/runtime/graphdriver/vfs/driver.go
new file mode 100644
index 0000000000..fe09560f24
--- /dev/null
+++ b/runtime/graphdriver/vfs/driver.go
@@ -0,0 +1,95 @@
+package vfs
+
+import (
+	"fmt"
+	"github.com/dotcloud/docker/runtime/graphdriver"
+	"os"
+	"os/exec"
+	"path"
+)
+
+func init() {
+	graphdriver.Register("vfs", Init)
+}
+
+func Init(home string) (graphdriver.Driver, error) {
+	d := &Driver{
+		home: home,
+	}
+	return d, nil
+}
+
+type Driver struct {
+	home string
+}
+
+func (d *Driver) String() string {
+	return "vfs"
+}
+
+func (d *Driver) Status() [][2]string {
+	return nil
+}
+
+func (d *Driver) Cleanup() error {
+	return nil
+}
+
+func copyDir(src, dst string) error {
+	if output, err := exec.Command("cp", "-aT", "--reflink=auto", src, dst).CombinedOutput(); err != nil {
+		return fmt.Errorf("Error VFS copying directory: %s (%s)", err, output)
+	}
+	return nil
+}
+
+func (d *Driver) Create(id string, parent string, mountLabel string) error {
+	dir := d.dir(id)
+	if err := os.MkdirAll(path.Dir(dir), 0700); err != nil {
+		return err
+	}
+	if err := os.Mkdir(dir, 0700); err != nil {
+		return err
+	}
+	if parent == "" {
+		return nil
+	}
+	parentDir, err := d.Get(parent)
+	if err != nil {
+		return fmt.Errorf("%s: %s", parent, err)
+	}
+	if err := copyDir(parentDir, dir); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *Driver) dir(id string) string {
+	return path.Join(d.home, "dir", path.Base(id))
+}
+
+func (d *Driver) Remove(id string) error {
+	if _, err := os.Stat(d.dir(id)); err != nil {
+		return err
+	}
+	return os.RemoveAll(d.dir(id))
+}
+
+func (d *Driver) Get(id 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
+}
+
+func (d *Driver) Put(id string) {
+	// The vfs driver has no runtime resources (e.g. mounts)
+	// to clean up, so we don't need anything here
+}
+
+func (d *Driver) Exists(id string) bool {
+	_, err := os.Stat(d.dir(id))
+	return err == nil
+}