forked from TrueCloudLab/distribution
c9aaff00f8
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>
111 lines
3.4 KiB
Go
111 lines
3.4 KiB
Go
package schema2
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import (
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"bytes"
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"encoding/json"
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"reflect"
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"testing"
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"github.com/docker/distribution"
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)
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var expectedManifestSerialization = []byte(`{
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"schemaVersion": 2,
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"mediaType": "application/vnd.docker.distribution.manifest.v2+json",
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"config": {
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"mediaType": "application/vnd.docker.container.image.v1+json",
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"size": 985,
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"digest": "sha256:1a9ec845ee94c202b2d5da74a24f0ed2058318bfa9879fa541efaecba272e86b"
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},
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"layers": [
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{
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"mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
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"size": 153263,
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"digest": "sha256:62d8908bee94c202b2d35224a221aaa2058318bfa9879fa541efaecba272331b"
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}
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]
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}`)
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func TestManifest(t *testing.T) {
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manifest := Manifest{
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Versioned: SchemaVersion,
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Config: distribution.Descriptor{
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Digest: "sha256:1a9ec845ee94c202b2d5da74a24f0ed2058318bfa9879fa541efaecba272e86b",
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Size: 985,
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MediaType: MediaTypeConfig,
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},
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Layers: []distribution.Descriptor{
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{
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Digest: "sha256:62d8908bee94c202b2d35224a221aaa2058318bfa9879fa541efaecba272331b",
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Size: 153263,
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MediaType: MediaTypeLayer,
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},
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},
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}
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deserialized, err := FromStruct(manifest)
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if err != nil {
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t.Fatalf("error creating DeserializedManifest: %v", err)
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}
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mediaType, canonical, err := deserialized.Payload()
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if mediaType != MediaTypeManifest {
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t.Fatalf("unexpected media type: %s", mediaType)
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}
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// Check that the canonical field is the same as json.MarshalIndent
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// with these parameters.
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p, err := json.MarshalIndent(&manifest, "", " ")
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if err != nil {
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t.Fatalf("error marshaling manifest: %v", err)
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}
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if !bytes.Equal(p, canonical) {
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t.Fatalf("manifest bytes not equal: %q != %q", string(canonical), string(p))
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}
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// Check that canonical field matches expected value.
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if !bytes.Equal(expectedManifestSerialization, canonical) {
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t.Fatalf("manifest bytes not equal: %q != %q", string(canonical), string(expectedManifestSerialization))
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}
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var unmarshalled DeserializedManifest
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if err := json.Unmarshal(deserialized.canonical, &unmarshalled); err != nil {
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t.Fatalf("error unmarshaling manifest: %v", err)
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}
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if !reflect.DeepEqual(&unmarshalled, deserialized) {
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t.Fatalf("manifests are different after unmarshaling: %v != %v", unmarshalled, *deserialized)
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}
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target := deserialized.Target()
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if target.Digest != "sha256:1a9ec845ee94c202b2d5da74a24f0ed2058318bfa9879fa541efaecba272e86b" {
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t.Fatalf("unexpected digest in target: %s", target.Digest.String())
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}
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if target.MediaType != MediaTypeConfig {
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t.Fatalf("unexpected media type in target: %s", target.MediaType)
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}
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if target.Size != 985 {
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t.Fatalf("unexpected size in target: %d", target.Size)
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}
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references := deserialized.References()
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if len(references) != 2 {
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t.Fatalf("unexpected number of references: %d", len(references))
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}
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if !reflect.DeepEqual(references[0], target) {
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t.Fatalf("first reference should be target: %v != %v", references[0], target)
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}
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// Test the second reference
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if references[1].Digest != "sha256:62d8908bee94c202b2d35224a221aaa2058318bfa9879fa541efaecba272331b" {
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t.Fatalf("unexpected digest in reference: %s", references[0].Digest.String())
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}
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if references[1].MediaType != MediaTypeLayer {
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t.Fatalf("unexpected media type in reference: %s", references[0].MediaType)
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}
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if references[1].Size != 153263 {
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t.Fatalf("unexpected size in reference: %d", references[0].Size)
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}
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}
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