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Sign without pulling from the registry
This allows signing in a disconnected environment. Signed-off-by: Brandon Mitchell <git@bmitch.net>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| // | ||
| // 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 empty | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/google/go-containerregistry/pkg/name" | ||
| v1 "github.com/google/go-containerregistry/pkg/v1" | ||
| "github.com/google/go-containerregistry/pkg/v1/empty" | ||
| "github.com/sigstore/cosign/pkg/oci" | ||
| ) | ||
|
|
||
| type signedImage struct { | ||
| v1.Image | ||
| digest v1.Hash | ||
| signature oci.Signatures | ||
| attestations oci.Signatures | ||
| } | ||
|
|
||
| func (se *signedImage) Signatures() (oci.Signatures, error) { | ||
| return se.signature, nil | ||
| } | ||
|
|
||
| func (se *signedImage) Attestations() (oci.Signatures, error) { | ||
| return se.attestations, nil | ||
| } | ||
|
|
||
| func (se *signedImage) Digest() (v1.Hash, error) { | ||
| if se.digest.Hex == "" { | ||
| return v1.Hash{}, fmt.Errorf("digest not available") | ||
| } | ||
| return se.digest, nil | ||
| } | ||
|
|
||
| func SignedImage(ref name.Reference) (oci.SignedImage, error) { | ||
| var err error | ||
| d := v1.Hash{} | ||
| base := empty.Image | ||
| if digest, ok := ref.(name.Digest); ok { | ||
| d, err = v1.NewHash(digest.DigestStr()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return &signedImage{ | ||
| Image: base, | ||
| digest: d, | ||
| signature: Signatures(), | ||
| attestations: Signatures(), | ||
| }, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| // | ||
| // 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 empty | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/google/go-containerregistry/pkg/name" | ||
| ) | ||
|
|
||
| func TestSignedImage(t *testing.T) { | ||
| tests := []struct { | ||
| ref string | ||
| digestStr string | ||
| digestErr string | ||
| }{ | ||
| { | ||
| ref: "hello-world:latest", | ||
| digestErr: "digest not available", | ||
| }, | ||
| { | ||
| ref: "hello-world@sha256:e1c082e3d3c45cccac829840a25941e679c25d438cc8412c2fa221cf1a824e6a", | ||
| digestStr: "sha256:e1c082e3d3c45cccac829840a25941e679c25d438cc8412c2fa221cf1a824e6a", | ||
| }, | ||
| } | ||
| for _, test := range tests { | ||
| ref, err := name.ParseReference(test.ref) | ||
| if err != nil { | ||
| t.Errorf("failed to parse ref \"%s\": %v", test.ref, err) | ||
| continue | ||
| } | ||
| se, err := SignedImage(ref) | ||
| if err != nil { | ||
| t.Errorf("failed to create signed image for \"%s\": %v", test.ref, err) | ||
| continue | ||
| } | ||
| d, err := se.Digest() | ||
| if (err == nil && test.digestErr != "") || | ||
| (err != nil && test.digestErr == "") || | ||
| (err != nil && test.digestErr != "" && err.Error() != test.digestErr) { | ||
| t.Errorf("digest error mismatch for \"%s\": expected %s, saw %v", test.ref, test.digestErr, err) | ||
| } | ||
| if test.digestStr != "" && d.String() != test.digestStr { | ||
| t.Errorf("digest mismatch for \"%s\": expected %s, saw %s", test.ref, test.digestStr, d.String()) | ||
| } | ||
| _, err = se.Signatures() | ||
| if err != nil { | ||
| t.Errorf("failed to get signatures for %s: %v", test.ref, err) | ||
| } | ||
| _, err = se.Attestations() | ||
| if err != nil { | ||
| t.Errorf("failed to get attestations for %s: %v", test.ref, err) | ||
| } | ||
| } | ||
| } |