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// Copyright 2016 The Linux Foundation
//
// 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 image
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto/sha256"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"testing"
)
func TestUnpackLayerDuplicateEntries(t *testing.T) {
tmp1, err := ioutil.TempDir("", "test-dup")
if err != nil {
t.Fatal(err)
}
tarfile := filepath.Join(tmp1, "test.tar")
f, err := os.Create(tarfile)
if err != nil {
t.Fatal(err)
}
defer f.Close()
defer os.RemoveAll(tmp1)
gw := gzip.NewWriter(f)
tw := tar.NewWriter(gw)
tw.WriteHeader(&tar.Header{Name: "test", Size: 4, Mode: 0600})
io.Copy(tw, bytes.NewReader([]byte("test")))
tw.WriteHeader(&tar.Header{Name: "test", Size: 5, Mode: 0600})
io.Copy(tw, bytes.NewReader([]byte("test1")))
tw.Close()
gw.Close()
r, err := os.Open(tarfile)
if err != nil {
t.Fatal(err)
}
defer r.Close()
tmp2, err := ioutil.TempDir("", "test-dest-unpack")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmp2)
if err := unpackLayer(tmp2, r); err != nil && !strings.Contains(err.Error(), "duplicate entry for") {
t.Fatalf("Expected to fail with duplicate entry, got %v", err)
}
}
func TestUnpackLayer(t *testing.T) {
tmp1, err := ioutil.TempDir("", "test-layer")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmp1)
err = os.MkdirAll(filepath.Join(tmp1, "blobs", "sha256"), 0700)
if err != nil {
t.Fatal(err)
}
tarfile := filepath.Join(tmp1, "blobs", "sha256", "test.tar")
f, err := os.Create(tarfile)
if err != nil {
t.Fatal(err)
}
gw := gzip.NewWriter(f)
tw := tar.NewWriter(gw)
tw.WriteHeader(&tar.Header{Name: "test", Size: 4, Mode: 0600})
io.Copy(tw, bytes.NewReader([]byte("test")))
tw.Close()
gw.Close()
f.Close()
// generate sha256 hash
h := sha256.New()
file, err := os.Open(tarfile)
if err != nil {
t.Fatal(err)
}
defer file.Close()
_, err = io.Copy(h, file)
if err != nil {
t.Fatal(err)
}
err = os.Rename(tarfile, filepath.Join(tmp1, "blobs", "sha256", fmt.Sprintf("%x", h.Sum(nil))))
if err != nil {
t.Fatal(err)
}
testManifest := manifest{
Layers: []descriptor{descriptor{
MediaType: "application/vnd.oci.image.layer.v1.tar+gzip",
Digest: fmt.Sprintf("sha256:%s", fmt.Sprintf("%x", h.Sum(nil))),
}},
}
err = testManifest.unpack(newPathWalker(tmp1), filepath.Join(tmp1, "rootfs"))
if err != nil {
t.Fatal(err)
}
_, err = os.Stat(filepath.Join(tmp1, "rootfs", "test"))
if err != nil {
t.Fatal(err)
}
}
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