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//
// Copyright 2021 The Sigstore Authors.
//
// 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 layout
import (
"fmt"
"runtime"
"testing"
"github.com/google/go-cmp/cmp"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/random"
"github.com/sigstore/cosign/v2/pkg/oci"
"github.com/sigstore/cosign/v2/pkg/oci/mutate"
"github.com/sigstore/cosign/v2/pkg/oci/signed"
"github.com/sigstore/cosign/v2/pkg/oci/static"
)
func TestReadWrite(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skip("test is flaky on windows, see https://github.com/sigstore/cosign/v2/issues/1389")
}
// write random signed image to disk
si := randomSignedImage(t)
tmp := t.TempDir()
if err := WriteSignedImage(tmp, si); err != nil {
t.Fatal(err)
}
// read the image and make sure the signatures exist
imageIndex, err := SignedImageIndex(tmp)
if err != nil {
t.Fatal(err)
}
gotSignedImage, err := imageIndex.SignedImage(v1.Hash{})
if err != nil {
t.Fatal(err)
}
// compare the image we read with the one we wrote
compareDigests(t, si, gotSignedImage)
// make sure we have 5 attestations
attImg, err := imageIndex.Attestations()
if err != nil {
t.Fatal(err)
}
atts, err := attImg.Get()
if err != nil {
t.Fatal(err)
}
if len(atts) != 5 {
t.Fatal("expected 5 attestations")
}
// make sure signatures are correct
sigImage, err := imageIndex.Signatures()
if err != nil {
t.Fatal(err)
}
sigs, err := sigImage.Get()
if err != nil {
t.Fatal(err)
}
want := 6
if len(sigs) != want {
t.Fatal("didn't get the expected number of signatures")
}
// make sure the annotation is correct
for i, sig := range sigs {
annotations, err := sig.Annotations()
if err != nil {
t.Fatal(err)
}
val, ok := annotations["layer"]
if !ok {
t.Fatal("expected annotation doesn't exist on signature")
}
if val != fmt.Sprintf("%d", i) {
t.Fatal("expected annotation isn't correct")
}
}
}
func randomSignedImage(t *testing.T) oci.SignedImage {
i, err := random.Image(300 /* byteSize */, 7 /* layers */)
if err != nil {
t.Fatalf("random.Image() = %v", err)
}
si := signed.Image(i)
want := 6 // Add 6 signatures
for i := 0; i < want; i++ {
annotationOption := static.WithAnnotations(map[string]string{"layer": fmt.Sprintf("%d", i)})
sig, err := static.NewSignature(nil, fmt.Sprintf("%d", i), annotationOption)
if err != nil {
t.Fatalf("static.NewSignature() = %v", err)
}
si, err = mutate.AttachSignatureToImage(si, sig)
if err != nil {
t.Fatalf("SignEntity() = %v", err)
}
}
want = 5 // Add 5 attestations
for i := 0; i < want; i++ {
sig, err := static.NewAttestation([]byte(fmt.Sprintf("%d", i)))
if err != nil {
t.Fatalf("static.NewSignature() = %v", err)
}
si, err = mutate.AttachAttestationToImage(si, sig)
if err != nil {
t.Fatalf("SignEntity() = %v", err)
}
}
return si
}
func compareDigests(t *testing.T, img1 oci.SignedImage, img2 oci.SignedImage) {
d1, err := img1.Digest()
if err != nil {
t.Fatal(err)
}
d2, err := img2.Digest()
if err != nil {
t.Fatal(err)
}
if d := cmp.Diff(d1, d2); d != "" {
t.Fatalf("digests are different: %s", d)
}
}
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