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driver.go
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driver.go
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// +build linux
package devmapper
import (
"fmt"
"io/ioutil"
"os"
"path"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/pkg/log"
"github.com/docker/docker/pkg/mount"
"github.com/docker/docker/pkg/units"
)
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, options []string) (graphdriver.Driver, error) {
deviceSet, err := NewDeviceSet(home, true, options)
if err != nil {
return nil, err
}
if err := graphdriver.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
DeviceSet: deviceSet,
home: home,
}
return graphdriver.NaiveDiffDriver(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},
{"Pool Blocksize", fmt.Sprintf("%s", units.HumanSize(int64(s.SectorSize)))},
{"Data file", s.DataLoopback},
{"Metadata file", s.MetadataLoopback},
{"Data Space Used", fmt.Sprintf("%s", units.HumanSize(int64(s.Data.Used)))},
{"Data Space Total", fmt.Sprintf("%s", units.HumanSize(int64(s.Data.Total)))},
{"Metadata Space Used", fmt.Sprintf("%s", units.HumanSize(int64(s.Metadata.Used)))},
{"Metadata Space Total", fmt.Sprintf("%s", units.HumanSize(int64(s.Metadata.Total)))},
}
if vStr, err := GetLibraryVersion(); err == nil {
status = append(status, [2]string{"Library Version", vStr})
}
return status
}
func (d *Driver) Cleanup() error {
err := d.DeviceSet.Shutdown()
if err2 := mount.Unmount(d.home); err == nil {
err = err2
}
return err
}
func (d *Driver) Create(id, parent string) error {
if err := d.DeviceSet.AddDevice(id, parent); err != nil {
return err
}
return nil
}
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); 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
}
func (d *Driver) Get(id, mountLabel string) (string, error) {
mp := path.Join(d.home, "mnt", id)
// Create the target directories if they don't exist
if err := os.MkdirAll(mp, 0755); err != nil && !os.IsExist(err) {
return "", err
}
// Mount the device
if err := d.DeviceSet.MountDevice(id, mp, mountLabel); err != nil {
return "", err
}
rootFs := path.Join(mp, "rootfs")
if err := os.MkdirAll(rootFs, 0755); err != nil && !os.IsExist(err) {
d.DeviceSet.UnmountDevice(id)
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 reconscruct this in case
// of later problems
if err := ioutil.WriteFile(idFile, []byte(id), 0600); err != nil {
d.DeviceSet.UnmountDevice(id)
return "", err
}
}
return rootFs, nil
}
func (d *Driver) Put(id string) {
if err := d.DeviceSet.UnmountDevice(id); err != nil {
log.Errorf("Warning: error unmounting device %s: %s", id, err)
}
}
func (d *Driver) Exists(id string) bool {
return d.DeviceSet.HasDevice(id)
}