digest_test.go

Documentation: github.com/sigstore/cosign/v2/pkg/oci/remote

     1  // Copyright 2021 The Sigstore Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package remote
    16  
    17  import (
    18  	"errors"
    19  	"testing"
    20  
    21  	"github.com/google/go-containerregistry/pkg/name"
    22  	v1 "github.com/google/go-containerregistry/pkg/v1"
    23  	"github.com/google/go-containerregistry/pkg/v1/remote"
    24  )
    25  
    26  func TestResolveDigest(t *testing.T) {
    27  	rg := remoteGet
    28  	defer func() {
    29  		remoteGet = rg
    30  	}()
    31  
    32  	tag := name.MustParseReference("gcr.io/distroless/static:nonroot")
    33  	// As of 2021-09-20:
    34  	// crane digest gcr.io/distroless/static:nonroot
    35  	digest := name.MustParseReference("gcr.io/distroless/static@sha256:be5d77c62dbe7fedfb0a4e5ec2f91078080800ab1f18358e5f31fcc8faa023c4")
    36  
    37  	t.Run("digest doesn't call remote.Get", func(t *testing.T) {
    38  		remoteGet = func(_ name.Reference, _ ...remote.Option) (*remote.Descriptor, error) {
    39  			t.Fatal("ResolveDigest should not call remote.Get.")
    40  			return nil, nil
    41  		}
    42  
    43  		got, err := ResolveDigest(digest)
    44  		if err != nil {
    45  			t.Fatalf("ResolveDigest() = %v", err)
    46  		}
    47  		if want := digest; got != want {
    48  			t.Errorf("ResolveDigest() = %v, wanted %v", got, want)
    49  		}
    50  	})
    51  
    52  	t.Run("tag calls remote.Get", func(t *testing.T) {
    53  		remoteGet = func(_ name.Reference, _ ...remote.Option) (*remote.Descriptor, error) {
    54  			return &remote.Descriptor{
    55  				Descriptor: v1.Descriptor{
    56  					Digest: v1.Hash{
    57  						Algorithm: "sha256",
    58  						// As of 2021-09-20:
    59  						// crane digest gcr.io/distroless/static:nonroot
    60  						Hex: "be5d77c62dbe7fedfb0a4e5ec2f91078080800ab1f18358e5f31fcc8faa023c4",
    61  					},
    62  				},
    63  			}, nil
    64  		}
    65  
    66  		got, err := ResolveDigest(tag)
    67  		if err != nil {
    68  			t.Fatalf("ResolveDigest() = %v", err)
    69  		}
    70  		if want := digest; got != want {
    71  			t.Errorf("ResolveDigest() = %v, wanted %v", got, want)
    72  		}
    73  	})
    74  
    75  	t.Run("remote.Get errors propagate", func(t *testing.T) {
    76  		want := errors.New("we should propagate this error")
    77  		remoteGet = func(_ name.Reference, _ ...remote.Option) (*remote.Descriptor, error) {
    78  			return nil, want
    79  		}
    80  
    81  		_, got := ResolveDigest(tag)
    82  		if !errors.Is(got, want) {
    83  			t.Fatalf("ResolveDigest() = %v, wanted %v", got, want)
    84  		}
    85  	})
    86  }
    87
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