mirror of
https://github.com/vbatts/tar-split.git
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491 lines
12 KiB
Go
491 lines
12 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tar
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"reflect"
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"strings"
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"testing"
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"testing/iotest"
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"time"
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)
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type writerTestEntry struct {
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header *Header
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contents string
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}
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type writerTest struct {
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file string // filename of expected output
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entries []*writerTestEntry
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}
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var writerTests = []*writerTest{
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// The writer test file was produced with this command:
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// tar (GNU tar) 1.26
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// ln -s small.txt link.txt
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// tar -b 1 --format=ustar -c -f writer.tar small.txt small2.txt link.txt
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{
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file: "testdata/writer.tar",
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entries: []*writerTestEntry{
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{
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header: &Header{
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Name: "small.txt",
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Mode: 0640,
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Uid: 73025,
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Gid: 5000,
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Size: 5,
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ModTime: time.Unix(1246508266, 0),
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Typeflag: '0',
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Uname: "dsymonds",
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Gname: "eng",
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},
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contents: "Kilts",
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},
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{
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header: &Header{
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Name: "small2.txt",
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Mode: 0640,
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Uid: 73025,
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Gid: 5000,
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Size: 11,
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ModTime: time.Unix(1245217492, 0),
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Typeflag: '0',
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Uname: "dsymonds",
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Gname: "eng",
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},
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contents: "Google.com\n",
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},
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{
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header: &Header{
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Name: "link.txt",
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Mode: 0777,
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Uid: 1000,
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Gid: 1000,
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Size: 0,
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ModTime: time.Unix(1314603082, 0),
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Typeflag: '2',
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Linkname: "small.txt",
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Uname: "strings",
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Gname: "strings",
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},
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// no contents
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},
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},
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},
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// The truncated test file was produced using these commands:
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// dd if=/dev/zero bs=1048576 count=16384 > /tmp/16gig.txt
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// tar -b 1 -c -f- /tmp/16gig.txt | dd bs=512 count=8 > writer-big.tar
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{
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file: "testdata/writer-big.tar",
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entries: []*writerTestEntry{
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{
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header: &Header{
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Name: "tmp/16gig.txt",
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Mode: 0640,
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Uid: 73025,
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Gid: 5000,
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Size: 16 << 30,
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ModTime: time.Unix(1254699560, 0),
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Typeflag: '0',
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Uname: "dsymonds",
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Gname: "eng",
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},
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// fake contents
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contents: strings.Repeat("\x00", 4<<10),
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},
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},
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},
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// The truncated test file was produced using these commands:
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// dd if=/dev/zero bs=1048576 count=16384 > (longname/)*15 /16gig.txt
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// tar -b 1 -c -f- (longname/)*15 /16gig.txt | dd bs=512 count=8 > writer-big-long.tar
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{
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file: "testdata/writer-big-long.tar",
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entries: []*writerTestEntry{
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{
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header: &Header{
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Name: strings.Repeat("longname/", 15) + "16gig.txt",
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Mode: 0644,
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Uid: 1000,
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Gid: 1000,
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Size: 16 << 30,
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ModTime: time.Unix(1399583047, 0),
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Typeflag: '0',
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Uname: "guillaume",
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Gname: "guillaume",
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},
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// fake contents
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contents: strings.Repeat("\x00", 4<<10),
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},
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},
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},
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// This file was produced using gnu tar 1.17
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// gnutar -b 4 --format=ustar (longname/)*15 + file.txt
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{
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file: "testdata/ustar.tar",
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entries: []*writerTestEntry{
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{
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header: &Header{
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Name: strings.Repeat("longname/", 15) + "file.txt",
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Mode: 0644,
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Uid: 0765,
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Gid: 024,
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Size: 06,
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ModTime: time.Unix(1360135598, 0),
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Typeflag: '0',
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Uname: "shane",
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Gname: "staff",
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},
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contents: "hello\n",
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},
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},
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},
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}
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// Render byte array in a two-character hexadecimal string, spaced for easy visual inspection.
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func bytestr(offset int, b []byte) string {
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const rowLen = 32
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s := fmt.Sprintf("%04x ", offset)
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for _, ch := range b {
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switch {
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case '0' <= ch && ch <= '9', 'A' <= ch && ch <= 'Z', 'a' <= ch && ch <= 'z':
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s += fmt.Sprintf(" %c", ch)
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default:
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s += fmt.Sprintf(" %02x", ch)
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}
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}
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return s
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}
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// Render a pseudo-diff between two blocks of bytes.
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func bytediff(a []byte, b []byte) string {
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const rowLen = 32
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s := fmt.Sprintf("(%d bytes vs. %d bytes)\n", len(a), len(b))
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for offset := 0; len(a)+len(b) > 0; offset += rowLen {
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na, nb := rowLen, rowLen
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if na > len(a) {
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na = len(a)
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}
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if nb > len(b) {
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nb = len(b)
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}
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sa := bytestr(offset, a[0:na])
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sb := bytestr(offset, b[0:nb])
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if sa != sb {
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s += fmt.Sprintf("-%v\n+%v\n", sa, sb)
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}
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a = a[na:]
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b = b[nb:]
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}
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return s
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}
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func TestWriter(t *testing.T) {
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testLoop:
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for i, test := range writerTests {
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expected, err := ioutil.ReadFile(test.file)
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if err != nil {
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t.Errorf("test %d: Unexpected error: %v", i, err)
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continue
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}
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buf := new(bytes.Buffer)
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tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB
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big := false
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for j, entry := range test.entries {
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big = big || entry.header.Size > 1<<10
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if err := tw.WriteHeader(entry.header); err != nil {
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t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err)
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continue testLoop
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}
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if _, err := io.WriteString(tw, entry.contents); err != nil {
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t.Errorf("test %d, entry %d: Failed writing contents: %v", i, j, err)
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continue testLoop
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}
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}
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// Only interested in Close failures for the small tests.
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if err := tw.Close(); err != nil && !big {
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t.Errorf("test %d: Failed closing archive: %v", i, err)
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continue testLoop
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}
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actual := buf.Bytes()
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if !bytes.Equal(expected, actual) {
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t.Errorf("test %d: Incorrect result: (-=expected, +=actual)\n%v",
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i, bytediff(expected, actual))
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}
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if testing.Short() { // The second test is expensive.
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break
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}
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}
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}
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func TestPax(t *testing.T) {
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// Create an archive with a large name
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fileinfo, err := os.Stat("testdata/small.txt")
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if err != nil {
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t.Fatal(err)
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}
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hdr, err := FileInfoHeader(fileinfo, "")
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if err != nil {
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t.Fatalf("os.Stat: %v", err)
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}
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// Force a PAX long name to be written
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longName := strings.Repeat("ab", 100)
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contents := strings.Repeat(" ", int(hdr.Size))
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hdr.Name = longName
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var buf bytes.Buffer
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writer := NewWriter(&buf)
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if err := writer.WriteHeader(hdr); err != nil {
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t.Fatal(err)
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}
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if _, err = writer.Write([]byte(contents)); err != nil {
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t.Fatal(err)
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}
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if err := writer.Close(); err != nil {
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t.Fatal(err)
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}
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// Simple test to make sure PAX extensions are in effect
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if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.")) {
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t.Fatal("Expected at least one PAX header to be written.")
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}
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// Test that we can get a long name back out of the archive.
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reader := NewReader(&buf)
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hdr, err = reader.Next()
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if err != nil {
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t.Fatal(err)
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}
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if hdr.Name != longName {
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t.Fatal("Couldn't recover long file name")
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}
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}
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func TestPaxSymlink(t *testing.T) {
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// Create an archive with a large linkname
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fileinfo, err := os.Stat("testdata/small.txt")
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if err != nil {
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t.Fatal(err)
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}
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hdr, err := FileInfoHeader(fileinfo, "")
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hdr.Typeflag = TypeSymlink
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if err != nil {
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t.Fatalf("os.Stat:1 %v", err)
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}
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// Force a PAX long linkname to be written
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longLinkname := strings.Repeat("1234567890/1234567890", 10)
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hdr.Linkname = longLinkname
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hdr.Size = 0
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var buf bytes.Buffer
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writer := NewWriter(&buf)
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if err := writer.WriteHeader(hdr); err != nil {
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t.Fatal(err)
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}
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if err := writer.Close(); err != nil {
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t.Fatal(err)
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}
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// Simple test to make sure PAX extensions are in effect
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if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.")) {
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t.Fatal("Expected at least one PAX header to be written.")
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}
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// Test that we can get a long name back out of the archive.
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reader := NewReader(&buf)
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hdr, err = reader.Next()
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if err != nil {
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t.Fatal(err)
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}
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if hdr.Linkname != longLinkname {
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t.Fatal("Couldn't recover long link name")
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}
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}
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func TestPaxNonAscii(t *testing.T) {
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// Create an archive with non ascii. These should trigger a pax header
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// because pax headers have a defined utf-8 encoding.
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fileinfo, err := os.Stat("testdata/small.txt")
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if err != nil {
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t.Fatal(err)
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}
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hdr, err := FileInfoHeader(fileinfo, "")
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if err != nil {
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t.Fatalf("os.Stat:1 %v", err)
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}
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// some sample data
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chineseFilename := "文件名"
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chineseGroupname := "組"
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chineseUsername := "用戶名"
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hdr.Name = chineseFilename
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hdr.Gname = chineseGroupname
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hdr.Uname = chineseUsername
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contents := strings.Repeat(" ", int(hdr.Size))
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var buf bytes.Buffer
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writer := NewWriter(&buf)
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if err := writer.WriteHeader(hdr); err != nil {
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t.Fatal(err)
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}
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if _, err = writer.Write([]byte(contents)); err != nil {
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t.Fatal(err)
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}
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if err := writer.Close(); err != nil {
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t.Fatal(err)
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}
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// Simple test to make sure PAX extensions are in effect
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if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.")) {
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t.Fatal("Expected at least one PAX header to be written.")
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}
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// Test that we can get a long name back out of the archive.
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reader := NewReader(&buf)
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hdr, err = reader.Next()
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if err != nil {
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t.Fatal(err)
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}
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if hdr.Name != chineseFilename {
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t.Fatal("Couldn't recover unicode name")
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}
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if hdr.Gname != chineseGroupname {
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t.Fatal("Couldn't recover unicode group")
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}
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if hdr.Uname != chineseUsername {
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t.Fatal("Couldn't recover unicode user")
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}
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}
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func TestPaxXattrs(t *testing.T) {
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xattrs := map[string]string{
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"user.key": "value",
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}
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// Create an archive with an xattr
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fileinfo, err := os.Stat("testdata/small.txt")
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if err != nil {
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t.Fatal(err)
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}
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hdr, err := FileInfoHeader(fileinfo, "")
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if err != nil {
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t.Fatalf("os.Stat: %v", err)
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}
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contents := "Kilts"
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hdr.Xattrs = xattrs
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var buf bytes.Buffer
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writer := NewWriter(&buf)
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if err := writer.WriteHeader(hdr); err != nil {
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t.Fatal(err)
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}
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if _, err = writer.Write([]byte(contents)); err != nil {
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t.Fatal(err)
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}
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if err := writer.Close(); err != nil {
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t.Fatal(err)
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}
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// Test that we can get the xattrs back out of the archive.
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reader := NewReader(&buf)
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hdr, err = reader.Next()
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if err != nil {
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t.Fatal(err)
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}
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if !reflect.DeepEqual(hdr.Xattrs, xattrs) {
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t.Fatalf("xattrs did not survive round trip: got %+v, want %+v",
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hdr.Xattrs, xattrs)
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}
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}
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func TestPAXHeader(t *testing.T) {
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medName := strings.Repeat("CD", 50)
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longName := strings.Repeat("AB", 100)
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paxTests := [][2]string{
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{paxPath + "=/etc/hosts", "19 path=/etc/hosts\n"},
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{"a=b", "6 a=b\n"}, // Single digit length
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{"a=names", "11 a=names\n"}, // Test case involving carries
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{paxPath + "=" + longName, fmt.Sprintf("210 path=%s\n", longName)},
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{paxPath + "=" + medName, fmt.Sprintf("110 path=%s\n", medName)}}
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for _, test := range paxTests {
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key, expected := test[0], test[1]
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if result := paxHeader(key); result != expected {
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t.Fatalf("paxHeader: got %s, expected %s", result, expected)
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}
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}
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}
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func TestUSTARLongName(t *testing.T) {
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// Create an archive with a path that failed to split with USTAR extension in previous versions.
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fileinfo, err := os.Stat("testdata/small.txt")
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if err != nil {
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t.Fatal(err)
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}
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hdr, err := FileInfoHeader(fileinfo, "")
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hdr.Typeflag = TypeDir
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if err != nil {
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t.Fatalf("os.Stat:1 %v", err)
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}
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// Force a PAX long name to be written. The name was taken from a practical example
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// that fails and replaced ever char through numbers to anonymize the sample.
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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/"
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hdr.Name = longName
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hdr.Size = 0
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var buf bytes.Buffer
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writer := NewWriter(&buf)
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if err := writer.WriteHeader(hdr); err != nil {
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t.Fatal(err)
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}
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if err := writer.Close(); err != nil {
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t.Fatal(err)
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}
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// Test that we can get a long name back out of the archive.
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reader := NewReader(&buf)
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hdr, err = reader.Next()
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if err != nil {
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t.Fatal(err)
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}
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if hdr.Name != longName {
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t.Fatal("Couldn't recover long name")
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}
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}
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func TestValidTypeflagWithPAXHeader(t *testing.T) {
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var buffer bytes.Buffer
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tw := NewWriter(&buffer)
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fileName := strings.Repeat("ab", 100)
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hdr := &Header{
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Name: fileName,
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Size: 4,
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Typeflag: 0,
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}
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if err := tw.WriteHeader(hdr); err != nil {
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t.Fatalf("Failed to write header: %s", err)
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}
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if _, err := tw.Write([]byte("fooo")); err != nil {
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t.Fatalf("Failed to write the file's data: %s", err)
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}
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tw.Close()
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tr := NewReader(&buffer)
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for {
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header, err := tr.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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t.Fatalf("Failed to read header: %s", err)
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}
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if header.Typeflag != 0 {
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t.Fatalf("Typeflag should've been 0, found %d", header.Typeflag)
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}
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}
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}
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