package store // import "github.com/docker/docker/volume/store" import ( "encoding/json" "github.com/boltdb/bolt" "github.com/docker/docker/errdefs" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) var volumeBucketName = []byte("volumes") type volumeMetadata struct { Name string Driver string Labels map[string]string Options map[string]string } func (s *VolumeStore) setMeta(name string, meta volumeMetadata) error { return s.db.Update(func(tx *bolt.Tx) error { return setMeta(tx, name, meta) }) } func setMeta(tx *bolt.Tx, name string, meta volumeMetadata) error { metaJSON, err := json.Marshal(meta) if err != nil { return err } b, err := tx.CreateBucketIfNotExists(volumeBucketName) if err != nil { return errors.Wrap(err, "error creating volume bucket") } return errors.Wrap(b.Put([]byte(name), metaJSON), "error setting volume metadata") } func (s *VolumeStore) getMeta(name string) (volumeMetadata, error) { var meta volumeMetadata err := s.db.View(func(tx *bolt.Tx) error { return getMeta(tx, name, &meta) }) return meta, err } func getMeta(tx *bolt.Tx, name string, meta *volumeMetadata) error { b := tx.Bucket(volumeBucketName) if b == nil { return errdefs.NotFound(errors.New("volume bucket does not exist")) } val := b.Get([]byte(name)) if len(val) == 0 { return nil } if err := json.Unmarshal(val, meta); err != nil { return errors.Wrap(err, "error unmarshaling volume metadata") } return nil } func (s *VolumeStore) removeMeta(name string) error { return s.db.Update(func(tx *bolt.Tx) error { return removeMeta(tx, name) }) } func removeMeta(tx *bolt.Tx, name string) error { b := tx.Bucket(volumeBucketName) return errors.Wrap(b.Delete([]byte(name)), "error removing volume metadata") } // listMeta is used during restore to get the list of volume metadata // from the on-disk database. // Any errors that occur are only logged. func listMeta(tx *bolt.Tx) []volumeMetadata { var ls []volumeMetadata b := tx.Bucket(volumeBucketName) b.ForEach(func(k, v []byte) error { if len(v) == 0 { // don't try to unmarshal an empty value return nil } var m volumeMetadata if err := json.Unmarshal(v, &m); err != nil { // Just log the error logrus.Errorf("Error while reading volume metadata for volume %q: %v", string(k), err) return nil } ls = append(ls, m) return nil }) return ls }