package daemon import ( "fmt" "github.com/docker/docker/api/types" "github.com/docker/docker/layer" "github.com/docker/docker/reference" ) // ImageHistory returns a slice of ImageHistory structures for the specified image // name by walking the image lineage. func (daemon *Daemon) ImageHistory(name string) ([]*types.ImageHistory, error) { img, err := daemon.GetImage(name) if err != nil { return nil, err } history := []*types.ImageHistory{} layerCounter := 0 rootFS := *img.RootFS rootFS.DiffIDs = nil for _, h := range img.History { var layerSize int64 if !h.EmptyLayer { if len(img.RootFS.DiffIDs) <= layerCounter { return nil, fmt.Errorf("too many non-empty layers in History section") } rootFS.Append(img.RootFS.DiffIDs[layerCounter]) l, err := daemon.layerStore.Get(rootFS.ChainID()) if err != nil { return nil, err } layerSize, err = l.DiffSize() layer.ReleaseAndLog(daemon.layerStore, l) if err != nil { return nil, err } layerCounter++ } history = append([]*types.ImageHistory{{ ID: "", Created: h.Created.Unix(), CreatedBy: h.CreatedBy, Comment: h.Comment, Size: layerSize, }}, history...) } // Fill in image IDs and tags histImg := img id := img.ID() for _, h := range history { h.ID = id.String() var tags []string for _, r := range daemon.referenceStore.References(id.Digest()) { if _, ok := r.(reference.NamedTagged); ok { tags = append(tags, r.String()) } } h.Tags = tags id = histImg.Parent if id == "" { break } histImg, err = daemon.GetImage(id.String()) if err != nil { break } } return history, nil }