// 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
}
func checkRootdirFs(rootdir string) error {
var buf syscall.Statfs_t
if err := syscall.Statfs(rootdir, &buf); err != nil {
return fmt.Errorf("Failed to access '%s': %s", rootdir, err)
}
if graphdriver.FsMagic(buf.Type) != graphdriver.FsMagicZfs {
logrus.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir)
return graphdriver.ErrPrerequisites
}
return nil
}