// 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,
ctr: graphdriver.NewRefCounter(graphdriver.NewDefaultChecker()),
}
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
}