Move all drivers to the same subdir graphdriver

graphdriver/devmapper/driver.go

@@ -0,0 +1,92 @@
+package devmapper
+
+import (
+	"fmt"
+	"github.com/dotcloud/docker/graphdriver"
+	"os"
+	"path"
+)
+
+func init() {
+	graphdriver.Register("devicemapper", Init)
+}
+
+// Placeholder interfaces, to be replaced
+// at integration.
+
+// End of placeholder interfaces.
+
+type Driver struct {
+	*DeviceSet
+	home string
+}
+
+func Init(home string) (graphdriver.Driver, error) {
+	deviceSet, err := NewDeviceSet(home)
+	if err != nil {
+		return nil, err
+	}
+	d := &Driver{
+		DeviceSet: deviceSet,
+		home:      home,
+	}
+	return d, nil
+}
+
+func (d *Driver) String() string {
+	return "devicemapper"
+}
+
+func (d *Driver) Status() [][2]string {
+	s := d.DeviceSet.Status()
+
+	status := [][2]string{
+		{"Pool Name", s.PoolName},
+		{"Data file", s.DataLoopback},
+		{"Metadata file", s.MetadataLoopback},
+		{"Data Space Used", fmt.Sprintf("%.1f Mb", float64(s.Data.Used)/(1024*1024))},
+		{"Data Space Total", fmt.Sprintf("%.1f Mb", float64(s.Data.Total)/(1024*1024))},
+		{"Metadata Space Used", fmt.Sprintf("%.1f Mb", float64(s.Metadata.Used)/(1024*1024))},
+		{"Metadata Space Total", fmt.Sprintf("%.1f Mb", float64(s.Metadata.Total)/(1024*1024))},
+	}
+	return status
+}
+
+func (d *Driver) Cleanup() error {
+	return d.DeviceSet.Shutdown()
+}
+
+func (d *Driver) Create(id string, parent string) error {
+	return d.DeviceSet.AddDevice(id, parent)
+}
+
+func (d *Driver) Remove(id string) error {
+	return d.DeviceSet.RemoveDevice(id)
+}
+
+func (d *Driver) Get(id string) (string, error) {
+	mp := path.Join(d.home, "mnt", id)
+	if err := d.mount(id, mp); err != nil {
+		return "", err
+	}
+	return mp, nil
+}
+
+func (d *Driver) Size(id string) (int64, error) {
+	return -1, fmt.Errorf("Not implemented")
+}
+
+func (d *Driver) mount(id, mountPoint string) error {
+	// Create the target directories if they don't exist
+	if err := os.MkdirAll(mountPoint, 0755); err != nil && !os.IsExist(err) {
+		return err
+	}
+	// If mountpoint is already mounted, do nothing
+	if mounted, err := Mounted(mountPoint); err != nil {
+		return fmt.Errorf("Error checking mountpoint: %s", err)
+	} else if mounted {
+		return nil
+	}
+	// Mount the device
+	return d.DeviceSet.MountDevice(id, mountPoint, false)
+}