package zfs import ( "fmt" "strings" "github.com/docker/docker/daemon/graphdriver" "github.com/sirupsen/logrus" "golang.org/x/sys/unix" ) func checkRootdirFs(rootdir string) error { var buf unix.Statfs_t if err := unix.Statfs(rootdir, &buf); err != nil { return fmt.Errorf("Failed to access '%s': %s", rootdir, err) } // on FreeBSD buf.Fstypename contains ['z', 'f', 's', 0 ... ] if (buf.Fstypename[0] != 122) || (buf.Fstypename[1] != 102) || (buf.Fstypename[2] != 115) || (buf.Fstypename[3] != 0) { logrus.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir) return graphdriver.ErrPrerequisites } return nil } func getMountpoint(id string) string { maxlen := 12 // we need to preserve filesystem suffix suffix := strings.SplitN(id, "-", 2) if len(suffix) > 1 { return id[:maxlen] + "-" + suffix[1] } return id[:maxlen] }