package libpod import ( "github.com/containers/storage/pkg/archive" "github.com/pkg/errors" "github.com/projectatomic/libpod/libpod/layers" ) // GetDiff returns the differences between the two images, layers, or containers func (r *Runtime) GetDiff(from, to string) ([]archive.Change, error) { toLayer, err := r.getLayerID(to) if err != nil { return nil, err } fromLayer := "" if from != "" { fromLayer, err = r.getLayerID(from) if err != nil { return nil, err } } return r.store.Changes(fromLayer, toLayer) } // GetLayerID gets a full layer id given a full or partial id // If the id matches a container or image, the id of the top layer is returned // If the id matches a layer, the top layer id is returned func (r *Runtime) getLayerID(id string) (string, error) { var toLayer string toImage, err := r.imageRuntime.NewFromLocal(id) if err != nil { toCtr, err := r.store.Container(id) if err != nil { toLayer, err = layers.FullID(r.store, id) if err != nil { return "", errors.Errorf("layer, image, or container %s does not exist", id) } } else { toLayer = toCtr.LayerID } } else { toLayer = toImage.TopLayer() } return toLayer, nil }