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manifest: references should cover all children

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To allow generic manifest walking, we define an interface method of
`References` that returns the referenced items in the manifest. The
current implementation does not return the config target from schema2,
making this useless for most applications.

The garbage collector has been modified to show the utility of this
correctly formed `References` method. We may be able to make more
generic traversal methods with this, as well.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2016-10-12 17:20:27 -07:00
parent e3aabfb47e
commit c9aaff00f8
No known key found for this signature in database
GPG key ID: FB5F6B2905D7ECF3
9 changed files with 81 additions and 63 deletions
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4
manifest/schema2/builder_test.go
View file

@ -203,8 +203,8 @@ func TestBuilder(t *testing.T) {
}
references := manifest.References()
if !reflect.DeepEqual(references, descriptors) {
expected := append([]distribution.Descriptor{manifest.Target()}, descriptors...)
if !reflect.DeepEqual(references, expected) {
t.Fatal("References() does not match the descriptors added")
}
}

5
manifest/schema2/manifest.go
View file

@ -69,7 +69,10 @@ type Manifest struct {
// References returnes the descriptors of this manifests references.
func (m Manifest) References() []distribution.Descriptor {
return m.Layers
references := make([]distribution.Descriptor, 0, 1+len(m.Layers))
references = append(references, m.Config)
references = append(references, m.Layers...)
return references
}
// Target returns the target of this signed manifest.

14
manifest/schema2/manifest_test.go
View file

@ -90,16 +90,22 @@ func TestManifest(t *testing.T) {
}
references := deserialized.References()
if len(references) != 1 {
if len(references) != 2 {
t.Fatalf("unexpected number of references: %d", len(references))
}
if references[0].Digest != "sha256:62d8908bee94c202b2d35224a221aaa2058318bfa9879fa541efaecba272331b" {
if !reflect.DeepEqual(references[0], target) {
t.Fatalf("first reference should be target: %v != %v", references[0], target)
}
// Test the second reference
if references[1].Digest != "sha256:62d8908bee94c202b2d35224a221aaa2058318bfa9879fa541efaecba272331b" {
t.Fatalf("unexpected digest in reference: %s", references[0].Digest.String())
}
if references[0].MediaType != MediaTypeLayer {
if references[1].MediaType != MediaTypeLayer {
t.Fatalf("unexpected media type in reference: %s", references[0].MediaType)
}
if references[0].Size != 153263 {
if references[1].Size != 153263 {
t.Fatalf("unexpected size in reference: %d", references[0].Size)
}
}