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// Copyright 2019 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 compare
import (
"errors"
"fmt"
"strings"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// Layers compares the given layers to each other and returns an error if they
// differ. Note that this does not compare the actual contents (by calling
// Compressed or Uncompressed).
func Layers(a, b v1.Layer) error {
digests := []v1.Hash{}
diffids := []v1.Hash{}
sizes := []int64{}
mts := []types.MediaType{}
errs := []string{}
for _, layer := range []v1.Layer{a, b} {
digest, err := layer.Digest()
if err != nil {
return err
}
digests = append(digests, digest)
diffid, err := layer.DiffID()
if err != nil {
return err
}
diffids = append(diffids, diffid)
size, err := layer.Size()
if err != nil {
return err
}
sizes = append(sizes, size)
mt, err := layer.MediaType()
if err != nil {
return err
}
mts = append(mts, mt)
}
if want, got := digests[0], digests[1]; want != got {
errs = append(errs, fmt.Sprintf("a.Digest() != b.Digest(); %s != %s", want, got))
}
if want, got := diffids[0], diffids[1]; want != got {
errs = append(errs, fmt.Sprintf("a.DiffID() != b.DiffID(); %s != %s", want, got))
}
if want, got := sizes[0], sizes[1]; want != got {
errs = append(errs, fmt.Sprintf("a.Size() != b.Size(); %d != %d", want, got))
}
if want, got := mts[0], mts[1]; want != got {
errs = append(errs, fmt.Sprintf("a.MediaType() != b.MediaType(); %s != %s", want, got))
}
if len(errs) != 0 {
return errors.New("Layers differ:\n" + strings.Join(errs, "\n"))
}
return nil
}
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