// Init returns a new BTRFS driver.
// An error is returned if BTRFS is not supported.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
rootdir := path.Dir(home)
var buf syscall.Statfs_t
if err := syscall.Statfs(rootdir, &buf); err != nil {
return nil, err
}
if graphdriver.FsMagic(buf.Type) != graphdriver.FsMagicBtrfs {
return nil, graphdriver.ErrPrerequisites
}
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
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
driver := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
}
return graphdriver.NewNaiveDiffDriver(driver, uidMaps, gidMaps), nil
}
// Init returns a new BTRFS driver.
// An error is returned if BTRFS is not supported.
func Init(home string, options []string) (graphdriver.Driver, error) {
rootdir := path.Dir(home)
var buf syscall.Statfs_t
if err := syscall.Statfs(rootdir, &buf); err != nil {
return nil, err
}
if graphdriver.FsMagic(buf.Type) != graphdriver.FsMagicBtrfs {
return nil, graphdriver.ErrPrerequisites
}
if err := os.MkdirAll(home, 0700); err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
driver := &Driver{
home: home,
}
return graphdriver.NaiveDiffDriver(driver), nil
}
// Init creates a driver with the given home and the set of options.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
deviceSet, err := NewDeviceSet(home, true, options, uidMaps, gidMaps)
if err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
DeviceSet: deviceSet,
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
}
return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
// Init returns a new BTRFS driver.
// An error is returned if BTRFS is not supported.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsMagic != graphdriver.FsMagicBtrfs {
return nil, graphdriver.ErrPrerequisites
}
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
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
driver := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
}
return graphdriver.NewNaiveDiffDriver(driver, uidMaps, gidMaps), nil
}
// Init returns a new AUFS driver.
// An error is returned if AUFS is not supported.
func Init(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
// Try to load the aufs kernel module
if err := supportsAufs(); err != nil {
return nil, graphdriver.ErrNotSupported
}
fsMagic, err := graphdriver.GetFSMagic(root)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
for _, magic := range incompatibleFsMagic {
if fsMagic == magic {
return nil, graphdriver.ErrIncompatibleFS
}
}
paths := []string{
"mnt",
"diff",
"layers",
}
a := &Driver{
root: root,
uidMaps: uidMaps,
gidMaps: gidMaps,
pathCache: make(map[string]string),
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the root aufs driver dir and return
// if it already exists
// If not populate the dir structure
if err := idtools.MkdirAllAs(root, 0700, rootUID, rootGID); err != nil {
if os.IsExist(err) {
return a, nil
}
return nil, err
}
if err := mountpk.MakePrivate(root); err != nil {
return nil, err
}
// Populate the dir structure
for _, p := range paths {
if err := idtools.MkdirAllAs(path.Join(root, p), 0700, rootUID, rootGID); err != nil {
return nil, err
}
}
return a, nil
}
// Init returns the a native diff driver for overlay filesystem.
// If overlay filesystem is not supported on the host, graphdriver.ErrNotSupported is returned as error.
// If a overlay filesystem is not supported over a existing filesystem then error graphdriver.ErrIncompatibleFS is returned.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
opts, err := parseOptions(options)
if err != nil {
return nil, err
}
if err := supportsOverlay(); err != nil {
return nil, graphdriver.ErrNotSupported
}
// require kernel 4.0.0 to ensure multiple lower dirs are supported
v, err := kernel.GetKernelVersion()
if err != nil {
return nil, err
}
if kernel.CompareKernelVersion(*v, kernel.VersionInfo{Kernel: 4, Major: 0, Minor: 0}) < 0 {
if !opts.overrideKernelCheck {
return nil, graphdriver.ErrNotSupported
}
logrus.Warnf("Using pre-4.0.0 kernel for overlay2, mount failures may require kernel update")
}
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
// check if they are running over btrfs, aufs, zfs, overlay, or ecryptfs
switch fsMagic {
case graphdriver.FsMagicBtrfs, graphdriver.FsMagicAufs, graphdriver.FsMagicZfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicEcryptfs:
logrus.Errorf("'overlay2' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the driver home dir
if err := idtools.MkdirAllAs(path.Join(home, linkDir), 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewFsChecker(graphdriver.FsMagicOverlay)),
}
return d, nil
}
// Init returns the NaiveDiffDriver, a native diff driver for overlay filesystem.
// If overlay filesystem is not supported on the host, graphdriver.ErrNotSupported is returned as error.
// If a overlay filesystem is not supported over a existing filesystem then error graphdriver.ErrIncompatibleFS is returned.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
if err := supportsOverlay(); err != nil {
return nil, graphdriver.ErrNotSupported
}
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
// check if they are running over btrfs, aufs, zfs or overlay
switch fsMagic {
case graphdriver.FsMagicBtrfs:
logrus.Error("'overlay' is not supported over btrfs.")
return nil, graphdriver.ErrIncompatibleFS
case graphdriver.FsMagicAufs:
logrus.Error("'overlay' is not supported over aufs.")
return nil, graphdriver.ErrIncompatibleFS
case graphdriver.FsMagicZfs:
logrus.Error("'overlay' is not supported over zfs.")
return nil, graphdriver.ErrIncompatibleFS
case graphdriver.FsMagicOverlay:
logrus.Error("'overlay' is not supported over overlay.")
return nil, graphdriver.ErrIncompatibleFS
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the driver home dir
if err := idtools.MkdirAllAs(home, 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
home: home,
pathCache: make(map[string]string),
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(),
}
return NaiveDiffDriverWithApply(d, uidMaps, gidMaps), nil
}
// Init returns the NaiveDiffDriver, a native diff driver for overlay filesystem.
// If overlay filesystem is not supported on the host, graphdriver.ErrNotSupported is returned as error.
// If an overlay filesystem is not supported over an existing filesystem then error graphdriver.ErrIncompatibleFS is returned.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
if err := supportsOverlay(); err != nil {
return nil, graphdriver.ErrNotSupported
}
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
switch fsMagic {
case graphdriver.FsMagicAufs, graphdriver.FsMagicBtrfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicZfs, graphdriver.FsMagicEcryptfs:
logrus.Errorf("'overlay' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the driver home dir
if err := idtools.MkdirAllAs(home, 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
supportsDType, err := fsutils.SupportsDType(home)
if err != nil {
return nil, err
}
if !supportsDType {
// not a fatal error until v1.16 (#27443)
logrus.Warn(overlayutils.ErrDTypeNotSupported("overlay", backingFs))
}
d := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewFsChecker(graphdriver.FsMagicOverlay)),
supportsDType: supportsDType,
}
return NaiveDiffDriverWithApply(d, uidMaps, gidMaps), nil
}
// New returns a new AUFS driver.
// An error is returned if AUFS is not supported.
func Init(root string, options []string) (graphdriver.Driver, error) {
// Try to load the aufs kernel module
if err := supportsAufs(); err != nil {
return nil, graphdriver.ErrNotSupported
}
rootdir := path.Dir(root)
var buf syscall.Statfs_t
if err := syscall.Statfs(rootdir, &buf); err != nil {
return nil, fmt.Errorf("Couldn't stat the root directory: %s", err)
}
for _, magic := range incompatibleFsMagic {
if graphdriver.FsMagic(buf.Type) == magic {
return nil, graphdriver.ErrIncompatibleFS
}
}
paths := []string{
"mnt",
"diff",
"layers",
}
a := &Driver{
root: root,
active: make(map[string]int),
}
// Create the root aufs driver dir and return
// if it already exists
// If not populate the dir structure
if err := os.MkdirAll(root, 0755); err != nil {
if os.IsExist(err) {
return a, nil
}
return nil, err
}
if err := mountpk.MakePrivate(root); err != nil {
return nil, err
}
for _, p := range paths {
if err := os.MkdirAll(path.Join(root, p), 0755); err != nil {
return nil, err
}
}
return a, nil
}
// Init returns a new AUFS driver.
// An error is returned if AUFS is not supported.
func Init(root string, options []string) (graphdriver.Driver, error) {
// Try to load the aufs kernel module
if err := supportsAufs(); err != nil {
return nil, graphdriver.ErrNotSupported
}
fsMagic, err := graphdriver.GetFSMagic(root)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
for _, magic := range incompatibleFsMagic {
if fsMagic == magic {
return nil, graphdriver.ErrIncompatibleFS
}
}
paths := []string{
"mnt",
"diff",
"layers",
}
a := &Driver{
root: root,
active: make(map[string]*data),
}
// Create the root aufs driver dir
if err := os.MkdirAll(root, 0755); err != nil {
return nil, err
}
if err := mountpk.MakePrivate(root); err != nil {
return nil, err
}
// Populate the dir structure
for _, p := range paths {
if err := os.MkdirAll(path.Join(root, p), 0755); err != nil {
return nil, err
}
}
return a, nil
}
func Init(home string, options []string) (graphdriver.Driver, error) {
deviceSet, err := NewDeviceSet(home, true, options)
if err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
DeviceSet: deviceSet,
home: home,
}
return graphdriver.NaiveDiffDriver(d), nil
}
// Init returns a new BTRFS driver.
// An error is returned if BTRFS is not supported.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsMagic != graphdriver.FsMagicBtrfs {
return nil, graphdriver.ErrPrerequisites
}
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
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
opt, err := parseOptions(options)
if err != nil {
return nil, err
}
if userDiskQuota {
if err := subvolEnableQuota(home); err != nil {
return nil, err
}
quotaEnabled = true
}
driver := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
options: opt,
}
return graphdriver.NewNaiveDiffDriver(driver, uidMaps, gidMaps), nil
}
// Init creates a driver with the given home and the set of options.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
deviceSet, err := NewDeviceSet(home, true, options, uidMaps, gidMaps)
if err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
DeviceSet: deviceSet,
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
}
return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
func NewRbdDriver(home string, options []string) (degraph.Driver, error) {
if err := os.MkdirAll(home, 0700); err != nil && !os.IsExist(err) {
log.Errorf("Rbd create home dir %s failed: %v", err)
return nil, err
}
rbdSet, err := NewRbdSet(home, true, options)
if err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &RbdDriver{
RbdSet: rbdSet,
home: home,
}
return d, nil
}
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
if err := os.MkdirAll(home, 0700); err != nil && !os.IsExist(err) {
log.Errorf("Rbd create home dir %s failed: %v", err)
return nil, err
}
rbdSet, err := NewRbdSet(home, true, options, uidMaps, gidMaps)
if err != nil {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
d := &Driver{
RbdSet: rbdSet,
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
}
return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
// Init returns a new ZFS driver.
// It takes base mount path and an array of options which are represented as key value pairs.
// Each option is in the for key=value. 'zfs.fsname' is expected to be a valid key in the options.
func Init(base string, opt []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
var err error
if _, err := exec.LookPath("zfs"); err != nil {
logrus.Debugf("[zfs] zfs command is not available: %v", err)
return nil, graphdriver.ErrPrerequisites
}
file, err := os.OpenFile("/dev/zfs", os.O_RDWR, 600)
if err != nil {
logrus.Debugf("[zfs] cannot open /dev/zfs: %v", err)
return nil, graphdriver.ErrPrerequisites
}
defer file.Close()
options, err := parseOptions(opt)
if err != nil {
return nil, err
}
options.mountPath = base
rootdir := path.Dir(base)
if options.fsName == "" {
err = checkRootdirFs(rootdir)
if err != nil {
return nil, err
}
}
if options.fsName == "" {
options.fsName, err = lookupZfsDataset(rootdir)
if err != nil {
return nil, err
}
}
zfs.SetLogger(new(Logger))
filesystems, err := zfs.Filesystems(options.fsName)
if err != nil {
return nil, fmt.Errorf("Cannot find root filesystem %s: %v", options.fsName, err)
}
filesystemsCache := make(map[string]bool, len(filesystems))
var rootDataset *zfs.Dataset
for _, fs := range filesystems {
if fs.Name == options.fsName {
rootDataset = fs
}
filesystemsCache[fs.Name] = true
}
if rootDataset == nil {
return nil, fmt.Errorf("BUG: zfs get all -t filesystem -rHp '%s' should contain '%s'", options.fsName, options.fsName)
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, fmt.Errorf("Failed to get root uid/guid: %v", err)
}
if err := idtools.MkdirAllAs(base, 0700, rootUID, rootGID); err != nil {
return nil, fmt.Errorf("Failed to create '%s': %v", base, err)
}
if err := mount.MakePrivate(base); err != nil {
return nil, err
}
d := &Driver{
dataset: rootDataset,
options: options,
filesystemsCache: filesystemsCache,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewDefaultChecker()),
}
return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
// chroot on linux uses pivot_root instead of chroot
// pivot_root takes a new root and an old root.
// Old root must be a sub-dir of new root, it is where the current rootfs will reside after the call to pivot_root.
// New root is where the new rootfs is set to.
// Old root is removed after the call to pivot_root so it is no longer available under the new root.
// This is similar to how libcontainer sets up a container's rootfs
func chroot(path string) (err error) {
// if the engine is running in a user namespace we need to use actual chroot
if rsystem.RunningInUserNS() {
return realChroot(path)
}
if err := syscall.Unshare(syscall.CLONE_NEWNS); err != nil {
return fmt.Errorf("Error creating mount namespace before pivot: %v", err)
}
// make everything in new ns private
if err := mount.MakeRPrivate("/"); err != nil {
return err
}
// ensure path is a mountpoint
if err := mount.MakePrivate(path); err != nil {
return err
}
// setup oldRoot for pivot_root
pivotDir, err := ioutil.TempDir(path, ".pivot_root")
if err != nil {
return fmt.Errorf("Error setting up pivot dir: %v", err)
}
var mounted bool
defer func() {
if mounted {
// make sure pivotDir is not mounted before we try to remove it
if errCleanup := syscall.Unmount(pivotDir, syscall.MNT_DETACH); errCleanup != nil {
if err == nil {
err = errCleanup
}
return
}
}
errCleanup := os.Remove(pivotDir)
// pivotDir doesn't exist if pivot_root failed and chroot+chdir was successful
// because we already cleaned it up on failed pivot_root
if errCleanup != nil && !os.IsNotExist(errCleanup) {
errCleanup = fmt.Errorf("Error cleaning up after pivot: %v", errCleanup)
if err == nil {
err = errCleanup
}
}
}()
if err := syscall.PivotRoot(path, pivotDir); err != nil {
// If pivot fails, fall back to the normal chroot after cleaning up temp dir
if err := os.Remove(pivotDir); err != nil {
return fmt.Errorf("Error cleaning up after failed pivot: %v", err)
}
return realChroot(path)
}
mounted = true
// This is the new path for where the old root (prior to the pivot) has been moved to
// This dir contains the rootfs of the caller, which we need to remove so it is not visible during extraction
pivotDir = filepath.Join("/", filepath.Base(pivotDir))
if err := syscall.Chdir("/"); err != nil {
return fmt.Errorf("Error changing to new root: %v", err)
}
// Make the pivotDir (where the old root lives) private so it can be unmounted without propagating to the host
if err := syscall.Mount("", pivotDir, "", syscall.MS_PRIVATE|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("Error making old root private after pivot: %v", err)
}
// Now unmount the old root so it's no longer visible from the new root
if err := syscall.Unmount(pivotDir, syscall.MNT_DETACH); err != nil {
return fmt.Errorf("Error while unmounting old root after pivot: %v", err)
}
mounted = false
return nil
}
// Init returns the a native diff driver for overlay filesystem.
// If overlay filesystem is not supported on the host, graphdriver.ErrNotSupported is returned as error.
// If an overlay filesystem is not supported over an existing filesystem then error graphdriver.ErrIncompatibleFS is returned.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
opts, err := parseOptions(options)
if err != nil {
return nil, err
}
if err := supportsOverlay(); err != nil {
return nil, graphdriver.ErrNotSupported
}
// require kernel 4.0.0 to ensure multiple lower dirs are supported
v, err := kernel.GetKernelVersion()
if err != nil {
return nil, err
}
if kernel.CompareKernelVersion(*v, kernel.VersionInfo{Kernel: 4, Major: 0, Minor: 0}) < 0 {
if !opts.overrideKernelCheck {
return nil, graphdriver.ErrNotSupported
}
logrus.Warn("Using pre-4.0.0 kernel for overlay2, mount failures may require kernel update")
}
fsMagic, err := graphdriver.GetFSMagic(home)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
// check if they are running over btrfs, aufs, zfs, overlay, or ecryptfs
switch fsMagic {
case graphdriver.FsMagicBtrfs, graphdriver.FsMagicAufs, graphdriver.FsMagicZfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicEcryptfs:
logrus.Errorf("'overlay2' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the driver home dir
if err := idtools.MkdirAllAs(path.Join(home, linkDir), 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}
if err := mount.MakePrivate(home); err != nil {
return nil, err
}
supportsDType, err := fsutils.SupportsDType(home)
if err != nil {
return nil, err
}
if !supportsDType {
// not a fatal error until v1.16 (#27443)
logrus.Warn(overlayutils.ErrDTypeNotSupported("overlay2", backingFs))
}
d := &Driver{
home: home,
uidMaps: uidMaps,
gidMaps: gidMaps,
ctr: graphdriver.NewRefCounter(graphdriver.NewFsChecker(graphdriver.FsMagicOverlay)),
supportsDType: supportsDType,
}
d.naiveDiff = graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps)
if backingFs == "xfs" {
// Try to enable project quota support over xfs.
if d.quotaCtl, err = quota.NewControl(home); err == nil {
projectQuotaSupported = true
}
}
logrus.Debugf("backingFs=%s, projectQuotaSupported=%v", backingFs, projectQuotaSupported)
return d, nil
}
// Init returns a new AUFS driver.
// An error is returned if AUFS is not supported.
func Init(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
// Try to load the aufs kernel module
if err := supportsAufs(); err != nil {
return nil, graphdriver.ErrNotSupported
}
fsMagic, err := graphdriver.GetFSMagic(root)
if err != nil {
return nil, err
}
if fsName, ok := graphdriver.FsNames[fsMagic]; ok {
backingFs = fsName
}
switch fsMagic {
case graphdriver.FsMagicAufs, graphdriver.FsMagicBtrfs, graphdriver.FsMagicEcryptfs:
logrus.Errorf("AUFS is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
paths := []string{
"mnt",
"diff",
"layers",
}
a := &Driver{
root: root,
uidMaps: uidMaps,
gidMaps: gidMaps,
pathCache: make(map[string]string),
ctr: graphdriver.NewRefCounter(graphdriver.NewFsChecker(graphdriver.FsMagicAufs)),
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// Create the root aufs driver dir and return
// if it already exists
// If not populate the dir structure
if err := idtools.MkdirAllAs(root, 0700, rootUID, rootGID); err != nil {
if os.IsExist(err) {
return a, nil
}
return nil, err
}
if err := mountpk.MakePrivate(root); err != nil {
return nil, err
}
// Populate the dir structure
for _, p := range paths {
if err := idtools.MkdirAllAs(path.Join(root, p), 0700, rootUID, rootGID); err != nil {
return nil, err
}
}
a.naiveDiff = graphdriver.NewNaiveDiffDriver(a, uidMaps, gidMaps)
return a, nil
}
