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// Copyright 2020 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 estargz
import (
"archive/tar"
"bytes"
"fmt"
"io"
"strings"
"testing"
"github.com/google/go-containerregistry/internal/gzip"
)
func TestReader(t *testing.T) {
want := "This is the input string."
buf := bytes.NewBuffer(nil)
tw := tar.NewWriter(buf)
if err := tw.WriteHeader(&tar.Header{
Name: "foo",
Size: int64(len(want)),
}); err != nil {
t.Fatal("WriteHeader() =", err)
}
if _, err := tw.Write([]byte(want)); err != nil {
t.Fatal("tw.Write() =", err)
}
tw.Close()
zipped, _, err := ReadCloser(io.NopCloser(buf))
if err != nil {
t.Fatal("ReadCloser() =", err)
}
unzipped, err := gzip.UnzipReadCloser(zipped)
if err != nil {
t.Error("gzip.UnzipReadCloser() =", err)
}
defer unzipped.Close()
found := false
r := tar.NewReader(unzipped)
for {
hdr, err := r.Next()
if err == io.EOF {
break
} else if err != nil {
t.Fatal("tar.Next() =", err)
}
if hdr.Name != "foo" {
continue
}
found = true
b, err := io.ReadAll(r)
if err != nil {
t.Error("ReadAll() =", err)
}
if got := string(b); got != want {
t.Errorf("ReadAll(); got %q, want %q", got, want)
}
if err := unzipped.Close(); err != nil {
t.Error("Close() =", err)
}
}
if !found {
t.Error(`Did not find the expected file "foo"`)
}
}
var (
errRead = fmt.Errorf("Read failed")
)
type failReader struct{}
func (f failReader) Read(_ []byte) (int, error) {
return 0, errRead
}
func TestReadErrors(t *testing.T) {
fr := failReader{}
if _, _, err := ReadCloser(io.NopCloser(fr)); err != errRead {
t.Error("ReadCloser: expected errRead, got", err)
}
buf := bytes.NewBufferString("not a tarball")
if _, _, err := ReadCloser(io.NopCloser(buf)); !strings.Contains(err.Error(), "failed to parse tar file") {
t.Error(`ReadCloser: expected "failed to parse tar file", got`, err)
}
}
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