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helpers.go
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/
helpers.go
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package util
import (
"encoding/json"
"fmt"
"k8s.io/apimachinery/pkg/util/sets"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/manifest/schema2"
"github.com/golang/glog"
godigest "github.com/opencontainers/go-digest"
imageapi "github.com/openshift/origin/pkg/image/apis/image"
)
func fillImageLayers(image *imageapi.Image, manifest imageapi.DockerImageManifest) error {
if len(image.DockerImageLayers) != 0 {
// DockerImageLayers is already filled by the registry.
return nil
}
switch manifest.SchemaVersion {
case 1:
if len(manifest.History) != len(manifest.FSLayers) {
return fmt.Errorf("the image %s (%s) has mismatched history and fslayer cardinality (%d != %d)", image.Name, image.DockerImageReference, len(manifest.History), len(manifest.FSLayers))
}
image.DockerImageLayers = make([]imageapi.ImageLayer, len(manifest.FSLayers))
for i, obj := range manifest.History {
layer := manifest.FSLayers[i]
var size imageapi.DockerV1CompatibilityImageSize
if err := json.Unmarshal([]byte(obj.DockerV1Compatibility), &size); err != nil {
size.Size = 0
}
// reverse order of the layers: in schema1 manifests the
// first layer is the youngest (base layers are at the
// end), but we want to store layers in the Image resource
// in order from the oldest to the youngest.
revidx := (len(manifest.History) - 1) - i // n-1, n-2, ..., 1, 0
image.DockerImageLayers[revidx].Name = layer.DockerBlobSum
image.DockerImageLayers[revidx].LayerSize = size.Size
image.DockerImageLayers[revidx].MediaType = schema1.MediaTypeManifestLayer
}
case 2:
// The layer list is ordered starting from the base image (opposite order of schema1).
// So, we do not need to change the order of layers.
image.DockerImageLayers = make([]imageapi.ImageLayer, len(manifest.Layers))
for i, layer := range manifest.Layers {
image.DockerImageLayers[i].Name = layer.Digest
image.DockerImageLayers[i].LayerSize = layer.Size
image.DockerImageLayers[i].MediaType = layer.MediaType
}
default:
return fmt.Errorf("unrecognized Docker image manifest schema %d for %q (%s)", manifest.SchemaVersion, image.Name, image.DockerImageReference)
}
if image.Annotations == nil {
image.Annotations = map[string]string{}
}
image.Annotations[imageapi.DockerImageLayersOrderAnnotation] = imageapi.DockerImageLayersOrderAscending
return nil
}
// ImageWithMetadata mutates the given image. It parses raw DockerImageManifest data stored in the image and
// fills its DockerImageMetadata and other fields.
func ImageWithMetadata(image *imageapi.Image) error {
if len(image.DockerImageManifest) == 0 {
return nil
}
ReorderImageLayers(image)
if len(image.DockerImageLayers) > 0 && image.DockerImageMetadata.Size > 0 && len(image.DockerImageManifestMediaType) > 0 {
glog.V(5).Infof("Image metadata already filled for %s", image.Name)
return nil
}
manifest := imageapi.DockerImageManifest{}
if err := json.Unmarshal([]byte(image.DockerImageManifest), &manifest); err != nil {
return err
}
err := fillImageLayers(image, manifest)
if err != nil {
return err
}
switch manifest.SchemaVersion {
case 1:
image.DockerImageManifestMediaType = schema1.MediaTypeManifest
if len(manifest.History) == 0 {
// It should never have an empty history, but just in case.
return fmt.Errorf("the image %s (%s) has a schema 1 manifest, but it doesn't have history", image.Name, image.DockerImageReference)
}
v1Metadata := imageapi.DockerV1CompatibilityImage{}
if err := json.Unmarshal([]byte(manifest.History[0].DockerV1Compatibility), &v1Metadata); err != nil {
return err
}
image.DockerImageMetadata.ID = v1Metadata.ID
image.DockerImageMetadata.Parent = v1Metadata.Parent
image.DockerImageMetadata.Comment = v1Metadata.Comment
image.DockerImageMetadata.Created = v1Metadata.Created
image.DockerImageMetadata.Container = v1Metadata.Container
image.DockerImageMetadata.ContainerConfig = v1Metadata.ContainerConfig
image.DockerImageMetadata.DockerVersion = v1Metadata.DockerVersion
image.DockerImageMetadata.Author = v1Metadata.Author
image.DockerImageMetadata.Config = v1Metadata.Config
image.DockerImageMetadata.Architecture = v1Metadata.Architecture
case 2:
image.DockerImageManifestMediaType = schema2.MediaTypeManifest
if len(image.DockerImageConfig) == 0 {
return fmt.Errorf("dockerImageConfig must not be empty for manifest schema 2")
}
config := imageapi.DockerImageConfig{}
if err := json.Unmarshal([]byte(image.DockerImageConfig), &config); err != nil {
return fmt.Errorf("failed to parse dockerImageConfig: %v", err)
}
image.DockerImageMetadata.ID = manifest.Config.Digest
image.DockerImageMetadata.Parent = config.Parent
image.DockerImageMetadata.Comment = config.Comment
image.DockerImageMetadata.Created = config.Created
image.DockerImageMetadata.Container = config.Container
image.DockerImageMetadata.ContainerConfig = config.ContainerConfig
image.DockerImageMetadata.DockerVersion = config.DockerVersion
image.DockerImageMetadata.Author = config.Author
image.DockerImageMetadata.Config = config.Config
image.DockerImageMetadata.Architecture = config.Architecture
default:
return fmt.Errorf("unrecognized Docker image manifest schema %d for %q (%s)", manifest.SchemaVersion, image.Name, image.DockerImageReference)
}
layerSet := sets.NewString()
if manifest.SchemaVersion == 2 {
layerSet.Insert(manifest.Config.Digest)
image.DockerImageMetadata.Size = int64(len(image.DockerImageConfig))
} else {
image.DockerImageMetadata.Size = 0
}
for _, layer := range image.DockerImageLayers {
if layerSet.Has(layer.Name) {
continue
}
layerSet.Insert(layer.Name)
image.DockerImageMetadata.Size += layer.LayerSize
}
return nil
}
// ReorderImageLayers mutates the given image. It reorders the layers in ascending order.
// Ascending order matches the order of layers in schema 2. Schema 1 has reversed (descending) order of layers.
func ReorderImageLayers(image *imageapi.Image) {
if len(image.DockerImageLayers) == 0 {
return
}
layersOrder, ok := image.Annotations[imageapi.DockerImageLayersOrderAnnotation]
if !ok {
switch image.DockerImageManifestMediaType {
case schema1.MediaTypeManifest, schema1.MediaTypeSignedManifest:
layersOrder = imageapi.DockerImageLayersOrderAscending
case schema2.MediaTypeManifest:
layersOrder = imageapi.DockerImageLayersOrderDescending
default:
return
}
}
if layersOrder == imageapi.DockerImageLayersOrderDescending {
// reverse order of the layers (lowest = 0, highest = i)
for i, j := 0, len(image.DockerImageLayers)-1; i < j; i, j = i+1, j-1 {
image.DockerImageLayers[i], image.DockerImageLayers[j] = image.DockerImageLayers[j], image.DockerImageLayers[i]
}
}
if image.Annotations == nil {
image.Annotations = map[string]string{}
}
image.Annotations[imageapi.DockerImageLayersOrderAnnotation] = imageapi.DockerImageLayersOrderAscending
}
// ManifestMatchesImage returns true if the provided manifest matches the name of the image.
func ManifestMatchesImage(image *imageapi.Image, newManifest []byte) (bool, error) {
dgst, err := godigest.Parse(image.Name)
if err != nil {
return false, err
}
v := dgst.Verifier()
var canonical []byte
switch image.DockerImageManifestMediaType {
case schema2.MediaTypeManifest:
var m schema2.DeserializedManifest
if err := json.Unmarshal(newManifest, &m); err != nil {
return false, err
}
_, canonical, err = m.Payload()
if err != nil {
return false, err
}
case schema1.MediaTypeManifest, "":
var m schema1.SignedManifest
if err := json.Unmarshal(newManifest, &m); err != nil {
return false, err
}
canonical = m.Canonical
default:
return false, fmt.Errorf("unsupported manifest mediatype: %s", image.DockerImageManifestMediaType)
}
if _, err := v.Write(canonical); err != nil {
return false, err
}
return v.Verified(), nil
}
// ImageConfigMatchesImage returns true if the provided image config matches a digest
// stored in the manifest of the image.
func ImageConfigMatchesImage(image *imageapi.Image, imageConfig []byte) (bool, error) {
if image.DockerImageManifestMediaType != schema2.MediaTypeManifest {
return false, nil
}
var m schema2.DeserializedManifest
if err := json.Unmarshal([]byte(image.DockerImageManifest), &m); err != nil {
return false, err
}
v := m.Config.Digest.Verifier()
if _, err := v.Write(imageConfig); err != nil {
return false, err
}
return v.Verified(), nil
}