API: report multiple digests for images

Be prepared to report multiple image digests for images which contain
multiple manifests but, because they continue to have the same set of
layers and the same configuration, are considered to be the same image.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

5 files changed, 30 insertions, 7 deletions

diff --git a/API.md b/API.md
index e79f6ee5e..d96ea6cd0 100755
--- a/API.md
+++ b/API.md
@@ -1675,6 +1675,8 @@ id [string](https://godoc.org/builtin#string)
 
 digest [string](https://godoc.org/builtin#string)
 
+digests [[]string](#[]string)
+
 parentId [string](https://godoc.org/builtin#string)
 
 repoTags [[]string](#[]string)
diff --git a/cmd/podman/images.go b/cmd/podman/images.go
index e363fa3bb..6bb08e195 100644
--- a/cmd/podman/images.go
+++ b/cmd/podman/images.go
@@ -27,6 +27,7 @@ type imagesTemplateParams struct {
 	Tag         string
 	ID          string
 	Digest      digest.Digest
+	Digests     []digest.Digest
 	Created     string
 	CreatedTime time.Time
 	Size        string
@@ -34,12 +35,13 @@ type imagesTemplateParams struct {
 }
 
 type imagesJSONParams struct {
-	ID       string        `json:"id"`
-	Name     []string      `json:"names"`
-	Digest   digest.Digest `json:"digest"`
-	Created  time.Time     `json:"created"`
-	Size     *uint64       `json:"size"`
-	ReadOnly bool          `json:"readonly"`
+	ID       string          `json:"id"`
+	Name     []string        `json:"names"`
+	Digest   digest.Digest   `json:"digest"`
+	Digests  []digest.Digest `json:"digests"`
+	Created  time.Time       `json:"created"`
+	Size     *uint64         `json:"size"`
+	ReadOnly bool            `json:"readonly"`
 }
 
 type imagesOptions struct {
@@ -290,6 +292,7 @@ func getImagesTemplateOutput(ctx context.Context, images []*adapter.ContainerIma
 					Tag:         tag,
 					ID:          imageID,
 					Digest:      img.Digest(),
+					Digests:     img.Digests(),
 					CreatedTime: createdTime,
 					Created:     units.HumanDuration(time.Since(createdTime)) + " ago",
 					Size:        sizeStr,
@@ -321,6 +324,7 @@ func getImagesJSONOutput(ctx context.Context, images []*adapter.ContainerImage)
 			ID:       img.ID(),
 			Name:     img.Names(),
 			Digest:   img.Digest(),
+			Digests:  img.Digests(),
 			Created:  img.Created(),
 			Size:     size,
 			ReadOnly: img.IsReadOnly(),
diff --git a/cmd/podman/varlink/io.podman.varlink b/cmd/podman/varlink/io.podman.varlink
index 9ec7d1172..f9339fccb 100644
--- a/cmd/podman/varlink/io.podman.varlink
+++ b/cmd/podman/varlink/io.podman.varlink
@@ -58,7 +58,8 @@ type VolumeRemoveOpts (
 
 type Image (
   id: string,
-  digest:   string,
+  digest: string,
+  digests: []string,
   parentId: string,
   repoTags: []string,
   repoDigests: []string,
diff --git a/libpod/image/image.go b/libpod/image/image.go
index 2ab88f2e9..faa3b648a 100644
--- a/libpod/image/image.go
+++ b/libpod/image/image.go
@@ -299,6 +299,11 @@ func (i *Image) Digest() digest.Digest {
 	return i.image.Digest
 }
 
+// Digests returns the image's digests
+func (i *Image) Digests() []digest.Digest {
+	return i.image.Digests
+}
+
 // GetManifest returns the image's manifest as a byte array
 // and manifest type as a string.
 func (i *Image) GetManifest(ctx context.Context, instanceDigest *digest.Digest) ([]byte, string, error) {
diff --git a/pkg/adapter/runtime_remote.go b/pkg/adapter/runtime_remote.go
index fef3986f1..12bf550f2 100644
--- a/pkg/adapter/runtime_remote.go
+++ b/pkg/adapter/runtime_remote.go
@@ -146,6 +146,7 @@ type remoteImage struct {
 	InputName   string
 	Names       []string
 	Digest      digest.Digest
+	Digests     []digest.Digest
 	isParent    bool
 	Runtime     *LocalRuntime
 	TopLayer    string
@@ -226,10 +227,15 @@ func imageInListToContainerImage(i iopodman.Image, name string, runtime *LocalRu
 	if err != nil {
 		return nil, err
 	}
+	var digests []digest.Digest
+	for _, d := range i.Digests {
+		digests = append(digests, digest.Digest(d))
+	}
 	ri := remoteImage{
 		InputName:   name,
 		ID:          i.Id,
 		Digest:      digest.Digest(i.Digest),
+		Digests:     digests,
 		Labels:      i.Labels,
 		RepoTags:    i.RepoTags,
 		RepoDigests: i.RepoTags,
@@ -352,6 +358,11 @@ func (ci *ContainerImage) Digest() digest.Digest {
 	return ci.remoteImage.Digest
 }
 
+// Digests returns the image's digests
+func (ci *ContainerImage) Digests() []digest.Digest {
+	return append([]digest.Digest{}, ci.remoteImage.Digests...)
+}
+
 // Labels returns a map of the image's labels
 func (ci *ContainerImage) Labels(ctx context.Context) (map[string]string, error) {
 	return ci.remoteImage.Labels, nil