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// Copyright 2018 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 mutate_test
import (
"testing"
"time"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/google/go-containerregistry/pkg/v1/random"
)
func layerDigests(t *testing.T, img v1.Image) []string {
layers, err := img.Layers()
if err != nil {
t.Fatalf("oldBase.Layers: %v", err)
}
layerDigests := make([]string, len(layers))
for i, l := range layers {
dig, err := l.Digest()
if err != nil {
t.Fatalf("layer.Digest %d: %v", i, err)
}
t.Log(dig)
layerDigests[i] = dig.String()
}
return layerDigests
}
// TestRebase tests that layer digests are expected when performing a rebase on
// random.Image layers.
func TestRebase(t *testing.T) {
// Create a random old base image of 5 layers and get those layers' digests.
const oldBaseLayerCount = 5
oldBase, err := random.Image(100, oldBaseLayerCount)
if err != nil {
t.Fatalf("random.Image (oldBase): %v", err)
}
t.Log("Old base:")
_ = layerDigests(t, oldBase)
// Construct an image with 2 layers on top of oldBase (an empty layer and a random layer).
top, err := random.Image(100, 1)
if err != nil {
t.Fatalf("random.Image (top): %v", err)
}
topLayers, err := top.Layers()
if err != nil {
t.Fatalf("top.Layers: %v", err)
}
orig, err := mutate.Append(oldBase,
mutate.Addendum{
Layer: nil,
History: v1.History{
Author: "me",
Created: v1.Time{Time: time.Now()},
CreatedBy: "test-empty",
Comment: "this is an empty test",
EmptyLayer: true,
},
},
mutate.Addendum{
Layer: topLayers[0],
History: v1.History{
Author: "me",
Created: v1.Time{Time: time.Now()},
CreatedBy: "test",
Comment: "this is a test",
},
},
)
if err != nil {
t.Fatalf("Append: %v", err)
}
t.Log("Original:")
origLayerDigests := layerDigests(t, orig)
// Create a random new base image of 3 layers.
newBase, err := random.Image(100, 3)
if err != nil {
t.Fatalf("random.Image (newBase): %v", err)
}
t.Log("New base:")
newBaseLayerDigests := layerDigests(t, newBase)
// Add config file os/arch property fields
newBaseConfigFile, err := newBase.ConfigFile()
if err != nil {
t.Fatalf("newBase.ConfigFile: %v", err)
}
newBaseConfigFile.Architecture = "arm"
newBaseConfigFile.OS = "windows"
newBaseConfigFile.OSVersion = "10.0.17763.1339"
newBase, err = mutate.ConfigFile(newBase, newBaseConfigFile)
if err != nil {
t.Fatalf("ConfigFile (newBase): %v", err)
}
// Rebase original image onto new base.
rebased, err := mutate.Rebase(orig, oldBase, newBase)
if err != nil {
t.Fatalf("Rebase: %v", err)
}
rebasedBaseLayers, err := rebased.Layers()
if err != nil {
t.Fatalf("rebased.Layers: %v", err)
}
rebasedLayerDigests := make([]string, len(rebasedBaseLayers))
t.Log("Rebased image layer digests:")
for i, l := range rebasedBaseLayers {
dig, err := l.Digest()
if err != nil {
t.Fatalf("layer.Digest (rebased base layer %d): %v", i, err)
}
t.Log(dig)
rebasedLayerDigests[i] = dig.String()
}
// Compare rebased layers.
wantLayerDigests := append(newBaseLayerDigests, origLayerDigests[len(origLayerDigests)-1])
if len(rebasedLayerDigests) != len(wantLayerDigests) {
t.Fatalf("Rebased image contained %d layers, want %d", len(rebasedLayerDigests), len(wantLayerDigests))
}
for i, rl := range rebasedLayerDigests {
if got, want := rl, wantLayerDigests[i]; got != want {
t.Errorf("Layer %d mismatch, got %q, want %q", i, got, want)
}
}
// Compare rebased history.
origConfig, err := orig.ConfigFile()
if err != nil {
t.Fatalf("orig.ConfigFile: %v", err)
}
newBaseConfig, err := newBase.ConfigFile()
if err != nil {
t.Fatalf("newBase.ConfigFile: %v", err)
}
rebasedConfig, err := rebased.ConfigFile()
if err != nil {
t.Fatalf("rebased.ConfigFile: %v", err)
}
wantHistories := append(newBaseConfig.History, origConfig.History[oldBaseLayerCount:]...)
if len(wantHistories) != len(rebasedConfig.History) {
t.Fatalf("Rebased image contained %d history, want %d", len(rebasedConfig.History), len(wantHistories))
}
for i, rh := range rebasedConfig.History {
if got, want := rh.Comment, wantHistories[i].Comment; got != want {
t.Errorf("Layer %d mismatch, got %q, want %q", i, got, want)
}
}
// Compare ConfigFile property fields copied from new base.
if rebasedConfig.Architecture != newBaseConfig.Architecture {
t.Errorf("ConfigFile property Architecture mismatch, got %q, want %q", rebasedConfig.Architecture, newBaseConfig.Architecture)
}
if rebasedConfig.OS != newBaseConfig.OS {
t.Errorf("ConfigFile property OS mismatch, got %q, want %q", rebasedConfig.OS, newBaseConfig.OS)
}
if rebasedConfig.OSVersion != newBaseConfig.OSVersion {
t.Errorf("ConfigFile property OSVersion mismatch, got %q, want %q", rebasedConfig.OSVersion, newBaseConfig.OSVersion)
}
}
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