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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tar
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"testing"
"testing/iotest"
)
type writerTestEntry struct {
header *Header
contents string
}
type writerTest struct {
file string // filename of expected output
entries []*writerTestEntry
}
var writerTests = []*writerTest{
// The writer test file was produced with this command:
// tar (GNU tar) 1.26
// ln -s small.txt link.txt
// tar -b 1 --format=ustar -c -f writer.tar small.txt small2.txt link.txt
&writerTest{
file: "testdata/writer.tar",
entries: []*writerTestEntry{
&writerTestEntry{
header: &Header{
Name: "small.txt",
Mode: 0640,
Uid: 73025,
Gid: 5000,
Size: 5,
Mtime: 1246508266,
Typeflag: '0',
Uname: "dsymonds",
Gname: "eng",
},
contents: "Kilts",
},
&writerTestEntry{
header: &Header{
Name: "small2.txt",
Mode: 0640,
Uid: 73025,
Gid: 5000,
Size: 11,
Mtime: 1245217492,
Typeflag: '0',
Uname: "dsymonds",
Gname: "eng",
},
contents: "Google.com\n",
},
&writerTestEntry{
header: &Header{
Name: "link.txt",
Mode: 0777,
Uid: 1000,
Gid: 1000,
Size: 0,
Mtime: 1314603082,
Typeflag: '2',
Linkname: "small.txt",
Uname: "strings",
Gname: "strings",
},
// no contents
},
},
},
// The truncated test file was produced using these commands:
// dd if=/dev/zero bs=1048576 count=16384 > /tmp/16gig.txt
// tar -b 1 -c -f- /tmp/16gig.txt | dd bs=512 count=8 > writer-big.tar
&writerTest{
file: "testdata/writer-big.tar",
entries: []*writerTestEntry{
&writerTestEntry{
header: &Header{
Name: "tmp/16gig.txt",
Mode: 0640,
Uid: 73025,
Gid: 5000,
Size: 16 << 30,
Mtime: 1254699560,
Typeflag: '0',
Uname: "dsymonds",
Gname: "eng",
},
// no contents
},
},
},
}
// Render byte array in a two-character hexadecimal string, spaced for easy visual inspection.
func bytestr(offset int, b []byte) string {
const rowLen = 32
s := fmt.Sprintf("%04x ", offset)
for _, ch := range b {
switch {
case '0' <= ch && ch <= '9', 'A' <= ch && ch <= 'Z', 'a' <= ch && ch <= 'z':
s += fmt.Sprintf(" %c", ch)
default:
s += fmt.Sprintf(" %02x", ch)
}
}
return s
}
// Render a pseudo-diff between two blocks of bytes.
func bytediff(a []byte, b []byte) string {
const rowLen = 32
s := fmt.Sprintf("(%d bytes vs. %d bytes)\n", len(a), len(b))
for offset := 0; len(a)+len(b) > 0; offset += rowLen {
na, nb := rowLen, rowLen
if na > len(a) {
na = len(a)
}
if nb > len(b) {
nb = len(b)
}
sa := bytestr(offset, a[0:na])
sb := bytestr(offset, b[0:nb])
if sa != sb {
s += fmt.Sprintf("-%v\n+%v\n", sa, sb)
}
a = a[na:]
b = b[nb:]
}
return s
}
func TestWriter(t *testing.T) {
testLoop:
for i, test := range writerTests {
expected, err := ioutil.ReadFile(test.file)
if err != nil {
t.Errorf("test %d: Unexpected error: %v", i, err)
continue
}
buf := new(bytes.Buffer)
tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB
for j, entry := range test.entries {
if err := tw.WriteHeader(entry.header); err != nil {
t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err)
continue testLoop
}
if _, err := io.WriteString(tw, entry.contents); err != nil {
t.Errorf("test %d, entry %d: Failed writing contents: %v", i, j, err)
continue testLoop
}
}
if err := tw.Close(); err != nil {
t.Errorf("test %d: Failed closing archive: %v", i, err)
continue testLoop
}
actual := buf.Bytes()
if !bytes.Equal(expected, actual) {
t.Errorf("test %d: Incorrect result: (-=expected, +=actual)\n%v",
i, bytediff(expected, actual))
}
if testing.Short() { // The second test is expensive.
break
}
}
}
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