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// Copyright 2023 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package remote_test
import (
"fmt"
"net/http/httptest"
"net/url"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/registry"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/google/go-containerregistry/pkg/v1/random"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/google/go-containerregistry/pkg/v1/types"
)
func TestReferrers(t *testing.T) {
// Run all tests against:
//
// (1) A OCI 1.0 registry (without referrers API)
// (2) An OCI 1.1+ registry (with referrers API)
//
for _, leg := range []struct {
server *httptest.Server
tryFallback bool
}{
{
server: httptest.NewServer(registry.New(registry.WithReferrersSupport(false))),
tryFallback: true,
},
{
server: httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
tryFallback: false,
},
} {
s := leg.server
defer s.Close()
u, err := url.Parse(s.URL)
if err != nil {
t.Fatal(err)
}
descriptor := func(img v1.Image) v1.Descriptor {
d, err := img.Digest()
if err != nil {
t.Fatal(err)
}
sz, err := img.Size()
if err != nil {
t.Fatal(err)
}
mt, err := img.MediaType()
if err != nil {
t.Fatal(err)
}
return v1.Descriptor{
Digest: d,
Size: sz,
MediaType: mt,
ArtifactType: "application/testing123",
}
}
// Push an image we'll attach things to.
// We'll copy from src to dst.
rootRef, err := name.ParseReference(fmt.Sprintf("%s/repo:root", u.Host))
if err != nil {
t.Fatal(err)
}
rootImg, err := random.Image(10, 10)
if err != nil {
t.Fatal(err)
}
rootImg = mutate.ConfigMediaType(rootImg, types.MediaType("application/testing123"))
if err := remote.Write(rootRef, rootImg); err != nil {
t.Fatal(err)
}
rootDesc := descriptor(rootImg)
t.Logf("root image is %s", rootDesc.Digest)
// Push an image that refers to the root image as its subject.
leafRef, err := name.ParseReference(fmt.Sprintf("%s/repo:leaf", u.Host))
if err != nil {
t.Fatal(err)
}
leafImg, err := random.Image(20, 20)
if err != nil {
t.Fatal(err)
}
leafImg = mutate.ConfigMediaType(leafImg, types.MediaType("application/testing123"))
leafImg = mutate.Subject(leafImg, rootDesc).(v1.Image)
if err := remote.Write(leafRef, leafImg); err != nil {
t.Fatal(err)
}
leafDesc := descriptor(leafImg)
t.Logf("leaf image is %s", leafDesc.Digest)
// Get the referrers of the root image, by digest.
rootRefDigest := rootRef.Context().Digest(rootDesc.Digest.String())
index, err := remote.Referrers(rootRefDigest)
if err != nil {
t.Fatal(err)
}
if d := cmp.Diff([]v1.Descriptor{leafDesc}, index.Manifests); d != "" {
t.Fatalf("referrers diff (-want,+got): %s", d)
}
if leg.tryFallback {
// Get the referrers by querying the root image's fallback tag directly.
tag, err := name.ParseReference(fmt.Sprintf("%s/repo:sha256-%s", u.Host, rootDesc.Digest.Hex))
if err != nil {
t.Fatal(err)
}
idx, err := remote.Index(tag)
if err != nil {
t.Fatal(err)
}
mf, err := idx.IndexManifest()
if err != nil {
t.Fatal(err)
}
if d := cmp.Diff(index.Manifests, mf.Manifests); d != "" {
t.Fatalf("fallback tag diff (-want,+got): %s", d)
}
}
// Push the leaf image again, this time with a different tag.
// This shouldn't add another item to the root image's referrers,
// because it's the same digest.
// Push an image that refers to the root image as its subject.
leaf2Ref, err := name.ParseReference(fmt.Sprintf("%s/repo:leaf2", u.Host))
if err != nil {
t.Fatal(err)
}
if err := remote.Write(leaf2Ref, leafImg); err != nil {
t.Fatal(err)
}
// Get the referrers of the root image again, which should only have one entry.
rootRefDigest = rootRef.Context().Digest(rootDesc.Digest.String())
index, err = remote.Referrers(rootRefDigest)
if err != nil {
t.Fatal(err)
}
if d := cmp.Diff([]v1.Descriptor{leafDesc}, index.Manifests); d != "" {
t.Fatalf("referrers diff after second push (-want,+got): %s", d)
}
// Try applying filters and verify number of manifests and and annotations
index, err = remote.Referrers(rootRefDigest,
remote.WithFilter("artifactType", "application/testing123"))
if err != nil {
t.Fatal(err)
}
if numManifests := len(index.Manifests); numManifests == 0 {
t.Fatal("index contained 0 manifests")
}
index, err = remote.Referrers(rootRefDigest,
remote.WithFilter("artifactType", "application/testing123BADDDD"))
if err != nil {
t.Fatal(err)
}
if numManifests := len(index.Manifests); numManifests != 0 {
t.Fatalf("expected index to contain 0 manifests, but had %d", numManifests)
}
}
}
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