diff options
Diffstat (limited to 'libpod/images')
| -rw-r--r-- | libpod/images/image_data.go | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/libpod/images/image_data.go b/libpod/images/image_data.go new file mode 100644 index 000000000..12fb1e77a --- /dev/null +++ b/libpod/images/image_data.go @@ -0,0 +1,203 @@ +package images + +import ( + "encoding/json" + "time" + + "github.com/containers/image/docker/reference" + is "github.com/containers/image/storage" + "github.com/containers/image/transports" + "github.com/containers/image/types" + "github.com/containers/storage" + "github.com/kubernetes-incubator/cri-o/libpod/driver" + digest "github.com/opencontainers/go-digest" + ociv1 "github.com/opencontainers/image-spec/specs-go/v1" + "github.com/pkg/errors" +) + +// Data handles the data used when inspecting a container +// nolint +type Data struct { + ID string + Tags []string + Digests []string + Digest digest.Digest + Comment string + Created *time.Time + Container string + Author string + Config ociv1.ImageConfig + Architecture string + OS string + Annotations map[string]string + CreatedBy string + Size uint + VirtualSize uint + GraphDriver driver.Data + RootFS ociv1.RootFS +} + +// ParseImageNames parses the names we've stored with an image into a list of +// tagged references and a list of references which contain digests. +func ParseImageNames(names []string) (tags, digests []string, err error) { + for _, name := range names { + if named, err := reference.ParseNamed(name); err == nil { + if digested, ok := named.(reference.Digested); ok { + canonical, err := reference.WithDigest(named, digested.Digest()) + if err == nil { + digests = append(digests, canonical.String()) + } + } else { + if reference.IsNameOnly(named) { + named = reference.TagNameOnly(named) + } + if tagged, ok := named.(reference.Tagged); ok { + namedTagged, err := reference.WithTag(named, tagged.Tag()) + if err == nil { + tags = append(tags, namedTagged.String()) + } + } + } + } + } + return tags, digests, nil +} + +func annotations(manifest []byte, manifestType string) map[string]string { + annotations := make(map[string]string) + switch manifestType { + case ociv1.MediaTypeImageManifest: + var m ociv1.Manifest + if err := json.Unmarshal(manifest, &m); err == nil { + for k, v := range m.Annotations { + annotations[k] = v + } + } + } + return annotations +} + +// GetData gets the Data for a container with the given name in the given store. +func GetData(store storage.Store, name string) (*Data, error) { + img, err := FindImage(store, name) + if err != nil { + return nil, errors.Wrapf(err, "error reading image %q", name) + } + + imgRef, err := FindImageRef(store, "@"+img.ID) + if err != nil { + return nil, errors.Wrapf(err, "error reading image %q", img.ID) + } + defer imgRef.Close() + + tags, digests, err := ParseImageNames(img.Names) + if err != nil { + return nil, errors.Wrapf(err, "error parsing image names for %q", name) + } + + driverName, err := driver.GetDriverName(store) + if err != nil { + return nil, errors.Wrapf(err, "error reading name of storage driver") + } + + topLayerID := img.TopLayer + + driverMetadata, err := driver.GetDriverMetadata(store, topLayerID) + if err != nil { + return nil, errors.Wrapf(err, "error asking storage driver %q for metadata", driverName) + } + + layer, err := store.Layer(topLayerID) + if err != nil { + return nil, errors.Wrapf(err, "error reading information about layer %q", topLayerID) + } + size, err := store.DiffSize(layer.Parent, layer.ID) + if err != nil { + return nil, errors.Wrapf(err, "error determining size of layer %q", layer.ID) + } + + imgSize, err := imgRef.Size() + if err != nil { + return nil, errors.Wrapf(err, "error determining size of image %q", transports.ImageName(imgRef.Reference())) + } + + manifest, manifestType, err := imgRef.Manifest() + if err != nil { + return nil, errors.Wrapf(err, "error reading manifest for image %q", img.ID) + } + manifestDigest := digest.Digest("") + if len(manifest) > 0 { + manifestDigest = digest.Canonical.FromBytes(manifest) + } + annotations := annotations(manifest, manifestType) + + config, err := imgRef.OCIConfig() + if err != nil { + return nil, errors.Wrapf(err, "error reading image configuration for %q", img.ID) + } + historyComment := "" + historyCreatedBy := "" + if len(config.History) > 0 { + historyComment = config.History[len(config.History)-1].Comment + historyCreatedBy = config.History[len(config.History)-1].CreatedBy + } + + return &Data{ + ID: img.ID, + Tags: tags, + Digests: digests, + Digest: manifestDigest, + Comment: historyComment, + Created: config.Created, + Author: config.Author, + Config: config.Config, + Architecture: config.Architecture, + OS: config.OS, + Annotations: annotations, + CreatedBy: historyCreatedBy, + Size: uint(size), + VirtualSize: uint(size + imgSize), + GraphDriver: driver.Data{ + Name: driverName, + Data: driverMetadata, + }, + RootFS: config.RootFS, + }, nil +} + +// FindImage searches for a *storage.Image with a matching the given name or ID in the given store. +func FindImage(store storage.Store, image string) (*storage.Image, error) { + var img *storage.Image + ref, err := is.Transport.ParseStoreReference(store, image) + if err == nil { + img, err = is.Transport.GetStoreImage(store, ref) + } + if err != nil { + img2, err2 := store.Image(image) + if err2 != nil { + if ref == nil { + return nil, errors.Wrapf(err, "error parsing reference to image %q", image) + } + return nil, errors.Wrapf(err, "unable to locate image %q", image) + } + img = img2 + } + return img, nil +} + +// FindImageRef searches for and returns a new types.Image matching the given name or ID in the given store. +func FindImageRef(store storage.Store, image string) (types.Image, error) { + img, err := FindImage(store, image) + if err != nil { + return nil, errors.Wrapf(err, "unable to locate image %q", image) + } + ref, err := is.Transport.ParseStoreReference(store, "@"+img.ID) + if err != nil { + return nil, errors.Wrapf(err, "error parsing reference to image %q", img.ID) + } + imgRef, err := ref.NewImage(nil) + if err != nil { + return nil, errors.Wrapf(err, "error reading image %q", img.ID) + } + return imgRef, nil +} |