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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"
"reflect"
"strings"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// Images compares the given images to each other and returns an error if they
// differ.
func Images(a, b v1.Image) error {
digests := []v1.Hash{}
manifests := []*v1.Manifest{}
cns := []v1.Hash{}
sizes := []int64{}
mts := []types.MediaType{}
layerss := [][]v1.Layer{}
errs := []string{}
for _, img := range []v1.Image{a, b} {
layers, err := img.Layers()
if err != nil {
return err
}
layerss = append(layerss, layers)
digest, err := img.Digest()
if err != nil {
return err
}
digests = append(digests, digest)
manifest, err := img.Manifest()
if err != nil {
return err
}
manifests = append(manifests, manifest)
cn, err := img.ConfigName()
if err != nil {
return err
}
cns = append(cns, cn)
size, err := img.Size()
if err != nil {
return err
}
sizes = append(sizes, size)
mt, err := img.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 := cns[0], cns[1]; want != got {
errs = append(errs, fmt.Sprintf("a.ConfigName() != b.ConfigName(); %s != %s", want, got))
}
if want, got := manifests[0], manifests[1]; !reflect.DeepEqual(want, got) {
errs = append(errs, fmt.Sprintf("a.Manifest() != b.Manifest(); %v != %v", 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(layerss[0]) != len(layerss[1]) {
// If we have fewer layers than the first image, abort with an error so we don't panic.
return errors.New("len(a.Layers()) != len(b.Layers())")
}
// Compare each layer.
for i := 0; i < len(layerss[0]); i++ {
if err := Layers(layerss[0][i], layerss[1][i]); err != nil {
// Wrap the error in newlines to delineate layer errors.
errs = append(errs, fmt.Sprintf("Layers[%d]: %v\n", i, err))
}
}
if len(errs) != 0 {
return errors.New("Images differ:\n" + strings.Join(errs, "\n"))
}
return nil
}
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