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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 random
import (
"archive/tar"
"errors"
"io"
"testing"
"github.com/google/go-containerregistry/pkg/v1/types"
"github.com/google/go-containerregistry/pkg/v1/validate"
)
func TestManifestAndConfig(t *testing.T) {
want := int64(12)
img, err := Image(1024, want)
if err != nil {
t.Fatalf("Error loading image: %v", err)
}
manifest, err := img.Manifest()
if err != nil {
t.Fatalf("Error loading manifest: %v", err)
}
if got := int64(len(manifest.Layers)); got != want {
t.Fatalf("num layers; got %v, want %v", got, want)
}
config, err := img.ConfigFile()
if err != nil {
t.Fatalf("Error loading config file: %v", err)
}
if got := int64(len(config.RootFS.DiffIDs)); got != want {
t.Fatalf("num diff ids; got %v, want %v", got, want)
}
if err := validate.Image(img); err != nil {
t.Errorf("failed to validate: %v", err)
}
}
func TestTarLayer(t *testing.T) {
img, err := Image(1024, 5)
if err != nil {
t.Fatalf("Image: %v", err)
}
layers, err := img.Layers()
if err != nil {
t.Fatalf("Layers: %v", err)
}
if len(layers) != 5 {
t.Errorf("Got %d layers, want 5", len(layers))
}
for i, l := range layers {
mediaType, err := l.MediaType()
if err != nil {
t.Fatalf("MediaType: %v", err)
}
if got, want := mediaType, types.DockerLayer; got != want {
t.Fatalf("MediaType(); got %q, want %q", got, want)
}
rc, err := l.Uncompressed()
if err != nil {
t.Errorf("Uncompressed(%d): %v", i, err)
}
defer rc.Close()
tr := tar.NewReader(rc)
if _, err := tr.Next(); err != nil {
t.Errorf("tar.Next: %v", err)
}
if n, err := io.Copy(io.Discard, tr); err != nil {
t.Errorf("Reading tar layer: %v", err)
} else if n != 1024 {
t.Errorf("Layer %d was %d bytes, want 1024", i, n)
}
if _, err := tr.Next(); !errors.Is(err, io.EOF) {
t.Errorf("Layer contained more files; got %v, want EOF", err)
}
}
}
func TestRandomLayer(t *testing.T) {
l, err := Layer(1024, types.DockerLayer)
if err != nil {
t.Fatalf("Layer: %v", err)
}
mediaType, err := l.MediaType()
if err != nil {
t.Fatalf("MediaType: %v", err)
}
if got, want := mediaType, types.DockerLayer; got != want {
t.Errorf("MediaType(); got %q, want %q", got, want)
}
rc, err := l.Uncompressed()
if err != nil {
t.Fatalf("Uncompressed(): %v", err)
}
defer rc.Close()
tr := tar.NewReader(rc)
if _, err := tr.Next(); err != nil {
t.Fatalf("tar.Next: %v", err)
}
if n, err := io.Copy(io.Discard, tr); err != nil {
t.Errorf("Reading tar layer: %v", err)
} else if n != 1024 {
t.Errorf("Layer was %d bytes, want 1024", n)
}
if _, err := tr.Next(); !errors.Is(err, io.EOF) {
t.Errorf("Layer contained more files; got %v, want EOF", err)
}
}
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