1 files changed, 233 insertions, 0 deletions
diff --git a/pkg/v1/partial/uncompressed_test.go b/pkg/v1/partial/uncompressed_test.go
new file mode 100644
index 0000000..ce5a6fa
--- /dev/null
+++ b/pkg/v1/partial/uncompressed_test.go
@@ -0,0 +1,233 @@
+// 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 partial_test
+
+import (
+	"io"
+	"os"
+	"testing"
+
+	"github.com/google/go-containerregistry/internal/compare"
+	legacy "github.com/google/go-containerregistry/pkg/legacy/tarball"
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/mutate"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
+	"github.com/google/go-containerregistry/pkg/v1/random"
+	"github.com/google/go-containerregistry/pkg/v1/tarball"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+	"github.com/google/go-containerregistry/pkg/v1/validate"
+)
+
+// foreignLayer implements both partial.Describable and partial.UncompressedLayer.
+type foreignLayer struct {
+	wrapped v1.Layer
+}
+
+func (l *foreignLayer) Digest() (v1.Hash, error) {
+	return l.wrapped.Digest()
+}
+
+func (l *foreignLayer) Size() (int64, error) {
+	return l.wrapped.Size()
+}
+
+func (l *foreignLayer) MediaType() (types.MediaType, error) {
+	return types.DockerForeignLayer, nil
+}
+
+func (l *foreignLayer) Uncompressed() (io.ReadCloser, error) {
+	return l.wrapped.Uncompressed()
+}
+
+func (l *foreignLayer) DiffID() (v1.Hash, error) {
+	return l.wrapped.DiffID()
+}
+
+func (l *foreignLayer) Descriptor() (*v1.Descriptor, error) {
+	r, err := l.wrapped.Compressed()
+	if err != nil {
+		return nil, err
+	}
+	h, sz, err := v1.SHA256(r)
+	if err != nil {
+		return nil, err
+	}
+	return &v1.Descriptor{
+		Digest:    h,
+		Size:      sz,
+		MediaType: types.DockerForeignLayer,
+		URLs:      []string{"http://example.com"},
+	}, nil
+}
+
+func (l *foreignLayer) UncompressedSize() (int64, error) {
+	return partial.UncompressedSize(l.wrapped)
+}
+
+func TestUncompressedLayer(t *testing.T) {
+	randLayer, err := random.Layer(1024, types.DockerForeignLayer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	l := &foreignLayer{randLayer}
+
+	desc, err := partial.Descriptor(l)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if want, got := desc.URLs[0], "http://example.com"; want != got {
+		t.Errorf("URLs[0] = %s != %s", got, want)
+	}
+
+	layer, err := partial.UncompressedToLayer(l)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := validate.Layer(layer); err != nil {
+		t.Errorf("validate.Layer: %v", err)
+	}
+	if _, err := partial.UncompressedSize(layer); err != nil {
+		t.Errorf("partial.UncompressedSize: %v", err)
+	}
+}
+
+// legacy/tarball.Write + tarball.Image leverages a lot of uncompressed partials.
+//
+// This is cribbed from pkg/legacy/tarball just to get intra-package coverage.
+func TestLegacyWrite(t *testing.T) {
+	// Make a tempfile for tarball writes.
+	fp, err := os.CreateTemp("", "")
+	if err != nil {
+		t.Fatalf("Error creating temp file.")
+	}
+	t.Log(fp.Name())
+	defer fp.Close()
+	defer os.Remove(fp.Name())
+
+	// Make a random image + layer with Descriptor().
+	randImage, err := random.Image(256, 2)
+	if err != nil {
+		t.Fatalf("Error creating random image: %v", err)
+	}
+	randLayer, err := random.Layer(1024, types.DockerForeignLayer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	l, err := partial.UncompressedToLayer(&foreignLayer{randLayer})
+	if err != nil {
+		t.Fatal(err)
+	}
+	img, err := mutate.AppendLayers(randImage, l)
+	if err != nil {
+		t.Fatal(err)
+	}
+	tag, err := name.NewTag("gcr.io/foo/bar:latest", name.StrictValidation)
+	if err != nil {
+		t.Fatalf("Error creating test tag: %v", err)
+	}
+	o, err := os.Create(fp.Name())
+	if err != nil {
+		t.Fatalf("Error creating %q to write image tarball: %v", fp.Name(), err)
+	}
+	defer o.Close()
+	if err := legacy.Write(tag, img, o); err != nil {
+		t.Fatalf("Unexpected error writing tarball: %v", err)
+	}
+
+	// Make sure the image is valid and can be loaded.
+	// Load it both by nil and by its name.
+	for _, it := range []*name.Tag{nil, &tag} {
+		tarImage, err := tarball.ImageFromPath(fp.Name(), it)
+		if err != nil {
+			t.Fatalf("Unexpected error reading tarball: %v", err)
+		}
+		if err := validate.Image(tarImage); err != nil {
+			t.Errorf("validate.Image: %v", err)
+		}
+		if err := compare.Images(img, tarImage); err != nil {
+			t.Errorf("compare.Images: %v", err)
+		}
+	}
+
+	// Try loading a different tag, it should error.
+	fakeTag, err := name.NewTag("gcr.io/notthistag:latest", name.StrictValidation)
+	if err != nil {
+		t.Fatalf("Error generating tag: %v", err)
+	}
+	if _, err := tarball.ImageFromPath(fp.Name(), &fakeTag); err == nil {
+		t.Errorf("Expected error loading tag %v from image", fakeTag)
+	}
+}
+
+type uncompressedImage struct {
+	img v1.Image
+}
+
+func (i *uncompressedImage) RawConfigFile() ([]byte, error) {
+	return i.img.RawConfigFile()
+}
+
+func (i *uncompressedImage) MediaType() (types.MediaType, error) {
+	return i.img.MediaType()
+}
+
+func (i *uncompressedImage) LayerByDiffID(h v1.Hash) (partial.UncompressedLayer, error) {
+	return i.img.LayerByDiffID(h)
+}
+
+func (i *uncompressedImage) Descriptor() (*v1.Descriptor, error) {
+	return partial.Descriptor(i.img)
+}
+
+func TestUncompressed(t *testing.T) {
+	rnd, err := random.Image(1024, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	core := &uncompressedImage{rnd}
+
+	img, err := partial.UncompressedToImage(core)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := validate.Image(img); err != nil {
+		t.Fatalf("validate.Image: %v", err)
+	}
+	if _, err := partial.Descriptor(img); err != nil {
+		t.Fatalf("partial.Descriptor: %v", err)
+	}
+
+	layers, err := img.Layers()
+	if err != nil {
+		t.Fatal(err)
+	}
+	layer, err := partial.UncompressedToLayer(&fastpathLayer{layers[0]})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ok, err := partial.Exists(layer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
+}