// 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"
"os"
"reflect"
"sort"
"strings"
"testing"
"testing/iotest"
"time"
)
// 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) {
type entry struct {
header *Header
contents string
}
vectors := []struct {
file string // filename of expected output
entries []*entry
}{{
// 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
file: "testdata/writer.tar",
entries: []*entry{{
header: &Header{
Name: "small.txt",
Mode: 0640,
Uid: 73025,
Gid: 5000,
Size: 5,
ModTime: time.Unix(1246508266, 0),
Typeflag: '0',
Uname: "dsymonds",
Gname: "eng",
},
contents: "Kilts",
}, {
header: &Header{
Name: "small2.txt",
Mode: 0640,
Uid: 73025,
Gid: 5000,
Size: 11,
ModTime: time.Unix(1245217492, 0),
Typeflag: '0',
Uname: "dsymonds",
Gname: "eng",
},
contents: "Google.com\n",
}, {
header: &Header{
Name: "link.txt",
Mode: 0777,
Uid: 1000,
Gid: 1000,
Size: 0,
ModTime: time.Unix(1314603082, 0),
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
file: "testdata/writer-big.tar",
entries: []*entry{{
header: &Header{
Name: "tmp/16gig.txt",
Mode: 0640,
Uid: 73025,
Gid: 5000,
Size: 16 << 30,
ModTime: time.Unix(1254699560, 0),
Typeflag: '0',
Uname: "dsymonds",
Gname: "eng",
},
// fake contents
contents: strings.Repeat("\x00", 4<<10),
}},
}, {
// This truncated file was produced using this library.
// It was verified to work with GNU tar 1.27.1 and BSD tar 3.1.2.
// dd if=/dev/zero bs=1G count=16 >> writer-big-long.tar
// gnutar -xvf writer-big-long.tar
// bsdtar -xvf writer-big-long.tar
//
// This file is in PAX format.
file: "testdata/writer-big-long.tar",
entries: []*entry{{
header: &Header{
Name: strings.Repeat("longname/", 15) + "16gig.txt",
Mode: 0644,
Uid: 1000,
Gid: 1000,
Size: 16 << 30,
ModTime: time.Unix(1399583047, 0),
Typeflag: '0',
Uname: "guillaume",
Gname: "guillaume",
},
// fake contents
contents: strings.Repeat("\x00", 4<<10),
}},
}, {
// TODO(dsnet): The Writer output should match the following file.
// To fix an issue (see https://golang.org/issue/12594), we disabled
// prefix support, which alters the generated output.
/*
// This file was produced using gnu tar 1.17
// gnutar -b 4 --format=ustar (longname/)*15 + file.txt
file: "testdata/ustar.tar"
*/
file: "testdata/ustar.issue12594.tar", // This is a valid tar file, but not expected
entries: []*entry{{
header: &Header{
Name: strings.Repeat("longname/", 15) + "file.txt",
Mode: 0644,
Uid: 0765,
Gid: 024,
Size: 06,
ModTime: time.Unix(1360135598, 0),
Typeflag: '0',
Uname: "shane",
Gname: "staff",
},
contents: "hello\n",
}},
}, {
// This file was produced using gnu tar 1.26
// echo "Slartibartfast" > file.txt
// ln file.txt hard.txt
// tar -b 1 --format=ustar -c -f hardlink.tar file.txt hard.txt
file: "testdata/hardlink.tar",
entries: []*entry{{
header: &Header{
Name: "file.txt",
Mode: 0644,
Uid: 1000,
Gid: 100,
Size: 15,
ModTime: time.Unix(1425484303, 0),
Typeflag: '0',
Uname: "vbatts",
Gname: "users",
},
contents: "Slartibartfast\n",
}, {
header: &Header{
Name: "hard.txt",
Mode: 0644,
Uid: 1000,
Gid: 100,
Size: 0,
ModTime: time.Unix(1425484303, 0),
Typeflag: '1',
Linkname: "file.txt",
Uname: "vbatts",
Gname: "users",
},
// no contents
}},
}}
testLoop:
for i, v := range vectors {
expected, err := ioutil.ReadFile(v.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
big := false
for j, entry := range v.entries {
big = big || entry.header.Size > 1<<10
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
}
}
// Only interested in Close failures for the small tests.
if err := tw.Close(); err != nil && !big {
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
}
}
}
func TestPax(t *testing.T) {
// Create an archive with a large name
fileinfo, err := os.Stat("testdata/small.txt")
if err != nil {
t.Fatal(err)
}
hdr, err := FileInfoHeader(fileinfo, "")
if err != nil {
t.Fatalf("os.Stat: %v", err)
}
// Force a PAX long name to be written
longName := strings.Repeat("ab", 100)
contents := strings.Repeat(" ", int(hdr.Size))
hdr.Name = longName
var buf bytes.Buffer
writer := NewWriter(&buf)
if err := writer.WriteHeader(hdr); err != nil {
t.Fatal(err)
}
if _, err = writer.Write([]byte(contents)); err != nil {
t.Fatal(err)
}
if err := writer.Close(); err != nil {
t.Fatal(err)
}
// Simple test to make sure PAX extensions are in effect
if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
t.Fatal("Expected at least one PAX header to be written.")
}
// Test that we can get a long name back out of the archive.
reader := NewReader(&buf)
hdr, err = reader.Next()
if err != nil {
t.Fatal(err)
}
if hdr.Name != longName {
t.Fatal("Couldn't recover long file name")
}
}
func TestPaxSymlink(t *testing.T) {
// Create an archive with a large linkname
fileinfo, err := os.Stat("testdata/small.txt")
if err != nil {
t.Fatal(err)
}
hdr, err := FileInfoHeader(fileinfo, "")
hdr.Typeflag = TypeSymlink
if err != nil {
t.Fatalf("os.Stat:1 %v", err)
}
// Force a PAX long linkname to be written
longLinkname := strings.Repeat("1234567890/1234567890", 10)
hdr.Linkname = longLinkname
hdr.Size = 0
var buf bytes.Buffer
writer := NewWriter(&buf)
if err := writer.WriteHeader(hdr); err != nil {
t.Fatal(err)
}
if err := writer.Close(); err != nil {
t.Fatal(err)
}
// Simple test to make sure PAX extensions are in effect
if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
t.Fatal("Expected at least one PAX header to be written.")
}
// Test that we can get a long name back out of the archive.
reader := NewReader(&buf)
hdr, err = reader.Next()
if err != nil {
t.Fatal(err)
}
if hdr.Linkname != longLinkname {
t.Fatal("Couldn't recover long link name")
}
}
func TestPaxNonAscii(t *testing.T) {
// Create an archive with non ascii. These should trigger a pax header
// because pax headers have a defined utf-8 encoding.
fileinfo, err := os.Stat("testdata/small.txt")
if err != nil {
t.Fatal(err)
}
hdr, err := FileInfoHeader(fileinfo, "")
if err != nil {
t.Fatalf("os.Stat:1 %v", err)
}
// some sample data
chineseFilename := "文件名"
chineseGroupname := "組"
chineseUsername := "用戶名"
hdr.Name = chineseFilename
hdr.Gname = chineseGroupname
hdr.Uname = chineseUsername
contents := strings.Repeat(" ", int(hdr.Size))
var buf bytes.Buffer
writer := NewWriter(&buf)
if err := writer.WriteHeader(hdr); err != nil {
t.Fatal(err)
}
if _, err = writer.Write([]byte(contents)); err != nil {
t.Fatal(err)
}
if err := writer.Close(); err != nil {
t.Fatal(err)
}
// Simple test to make sure PAX extensions are in effect
if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
t.Fatal("Expected at least one PAX header to be written.")
}
// Test that we can get a long name back out of the archive.
reader := NewReader(&buf)
hdr, err = reader.Next()
if err != nil {
t.Fatal(err)
}
if hdr.Name != chineseFilename {
t.Fatal("Couldn't recover unicode name")
}
if hdr.Gname != chineseGroupname {
t.Fatal("Couldn't recover unicode group")
}
if hdr.Uname != chineseUsername {
t.Fatal("Couldn't recover unicode user")
}
}
func TestPaxXattrs(t *testing.T) {
xattrs := map[string]string{
"user.key": "value",
}
// Create an archive with an xattr
fileinfo, err := os.Stat("testdata/small.txt")
if err != nil {
t.Fatal(err)
}
hdr, err := FileInfoHeader(fileinfo, "")
if err != nil {
t.Fatalf("os.Stat: %v", err)
}
contents := "Kilts"
hdr.Xattrs = xattrs
var buf bytes.Buffer
writer := NewWriter(&buf)
if err := writer.WriteHeader(hdr); err != nil {
t.Fatal(err)
}
if _, err = writer.Write([]byte(contents)); err != nil {
t.Fatal(err)
}
if err := writer.Close(); err != nil {
t.Fatal(err)
}
// Test that we can get the xattrs back out of the archive.
reader := NewReader(&buf)
hdr, err = reader.Next()
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(hdr.Xattrs, xattrs) {
t.Fatalf("xattrs did not survive round trip: got %+v, want %+v",
hdr.Xattrs, xattrs)
}
}
func TestPaxHeadersSorted(t *testing.T) {
fileinfo, err := os.Stat("testdata/small.txt")
if err != nil {
t.Fatal(err)
}
hdr, err := FileInfoHeader(fileinfo, "")
if err != nil {
t.Fatalf("os.Stat: %v", err)
}
contents := strings.Repeat(" ", int(hdr.Size))
hdr.Xattrs = map[string]string{
"foo": "foo",
"bar": "bar",
"baz": "baz",
"qux": "qux",
}
var buf bytes.Buffer
writer := NewWriter(&buf)
if err := writer.WriteHeader(hdr); err != nil {
t.Fatal(err)
}
if _, err = writer.Write([]byte(contents)); err != nil {
t.Fatal(err)
}
if err := writer.Close(); err != nil {
t.Fatal(err)
}
// Simple test to make sure PAX extensions are in effect
if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
t.Fatal("Expected at least one PAX header to be written.")
}
// xattr bar should always appear before others
indices := []int{
bytes.Index(buf.Bytes(), []byte("bar=bar")),
bytes.Index(buf.Bytes(), []byte("baz=baz")),
bytes.Index(buf.Bytes(), []byte("foo=foo")),
bytes.Index(buf.Bytes(), []byte("qux=qux")),
}
if !sort.IntsAreSorted(indices) {
t.Fatal("PAX headers are not sorted")
}
}
func TestUSTARLongName(t *testing.T) {
// Create an archive with a path that failed to split with USTAR extension in previous versions.
fileinfo, err := os.Stat("testdata/small.txt")
if err != nil {
t.Fatal(err)
}
hdr, err := FileInfoHeader(fileinfo, "")
hdr.Typeflag = TypeDir
if err != nil {
t.Fatalf("os.Stat:1 %v", err)
}
// Force a PAX long name to be written. The name was taken from a practical example
// that fails and replaced ever char through numbers to anonymize the sample.
longName := "/0000_0000000/00000-000000000/0000_0000000/00000-0000000000000/0000_0000000/00000-0000000-00000000/0000_0000000/00000000/0000_0000000/000/0000_0000000/00000000v00/0000_0000000/000000/0000_0000000/0000000/0000_0000000/00000y-00/0000/0000/00000000/0x000000/"
hdr.Name = longName
hdr.Size = 0
var buf bytes.Buffer
writer := NewWriter(&buf)
if err := writer.WriteHeader(hdr); err != nil {
t.Fatal(err)
}
if err := writer.Close(); err != nil {
t.Fatal(err)
}
// Test that we can get a long name back out of the archive.
reader := NewReader(&buf)
hdr, err = reader.Next()
if err != nil {
t.Fatal(err)
}
if hdr.Name != longName {
t.Fatal("Couldn't recover long name")
}
}
func TestValidTypeflagWithPAXHeader(t *testing.T) {
var buffer bytes.Buffer
tw := NewWriter(&buffer)
fileName := strings.Repeat("ab", 100)
hdr := &Header{
Name: fileName,
Size: 4,
Typeflag: 0,
}
if err := tw.WriteHeader(hdr); err != nil {
t.Fatalf("Failed to write header: %s", err)
}
if _, err := tw.Write([]byte("fooo")); err != nil {
t.Fatalf("Failed to write the file's data: %s", err)
}
tw.Close()
tr := NewReader(&buffer)
for {
header, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
t.Fatalf("Failed to read header: %s", err)
}
if header.Typeflag != 0 {
t.Fatalf("Typeflag should've been 0, found %d", header.Typeflag)
}
}
}
func TestWriteAfterClose(t *testing.T) {
var buffer bytes.Buffer
tw := NewWriter(&buffer)
hdr := &Header{
Name: "small.txt",
Size: 5,
}
if err := tw.WriteHeader(hdr); err != nil {
t.Fatalf("Failed to write header: %s", err)
}
tw.Close()
if _, err := tw.Write([]byte("Kilts")); err != ErrWriteAfterClose {
t.Fatalf("Write: got %v; want ErrWriteAfterClose", err)
}
}
func TestSplitUSTARPath(t *testing.T) {
sr := strings.Repeat
vectors := []struct {
input string // Input path
prefix string // Expected output prefix
suffix string // Expected output suffix
ok bool // Split success?
}{
{"", "", "", false},
{"abc", "", "", false},
{"用戶名", "", "", false},
{sr("a", nameSize), "", "", false},
{sr("a", nameSize) + "/", "", "", false},
{sr("a", nameSize) + "/a", sr("a", nameSize), "a", true},
{sr("a", prefixSize) + "/", "", "", false},
{sr("a", prefixSize) + "/a", sr("a", prefixSize), "a", true},
{sr("a", nameSize+1), "", "", false},
{sr("/", nameSize+1), sr("/", nameSize-1), "/", true},
{sr("a", prefixSize) + "/" + sr("b", nameSize),
sr("a", prefixSize), sr("b", nameSize), true},
{sr("a", prefixSize) + "//" + sr("b", nameSize), "", "", false},
{sr("a/", nameSize), sr("a/", 77) + "a", sr("a/", 22), true},
}
for _, v := range vectors {
prefix, suffix, ok := splitUSTARPath(v.input)
if prefix != v.prefix || suffix != v.suffix || ok != v.ok {
t.Errorf("splitUSTARPath(%q):\ngot (%q, %q, %v)\nwant (%q, %q, %v)",
v.input, prefix, suffix, ok, v.prefix, v.suffix, v.ok)
}
}
}
// TestIssue12594 tests that the Writer does not attempt to populate the prefix
// field when encoding a header in the GNU format. The prefix field is valid
// in USTAR and PAX, but not GNU.
func TestIssue12594(t *testing.T) {
names := []string{
"0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/file.txt",
"0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32/33/file.txt",
"0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32/333/file.txt",
"0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32/33/34/35/36/37/38/39/40/file.txt",
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000/file.txt",
"/home/support/.openoffice.org/3/user/uno_packages/cache/registry/com.sun.star.comp.deployment.executable.PackageRegistryBackend",
}
for i, name := range names {
var b bytes.Buffer
tw := NewWriter(&b)
if err := tw.WriteHeader(&Header{
Name: name,
Uid: 1 << 25, // Prevent USTAR format
}); err != nil {
t.Errorf("test %d, unexpected WriteHeader error: %v", i, err)
}
if err := tw.Close(); err != nil {
t.Errorf("test %d, unexpected Close error: %v", i, err)
}
// The prefix field should never appear in the GNU format.
var blk block
copy(blk[:], b.Bytes())
prefix := string(blk.USTAR().Prefix())
if i := strings.IndexByte(prefix, 0); i >= 0 {
prefix = prefix[:i] // Truncate at the NUL terminator
}
if blk.GetFormat() == formatGNU && len(prefix) > 0 && strings.HasPrefix(name, prefix) {
t.Errorf("test %d, found prefix in GNU format: %s", i, prefix)
}
tr := NewReader(&b)
hdr, err := tr.Next()
if err != nil {
t.Errorf("test %d, unexpected Next error: %v", i, err)
}
if hdr.Name != name {
t.Errorf("test %d, hdr.Name = %s, want %s", i, hdr.Name, name)
}
}
}