go tar_test 源码
golang tar_test 代码
文件路径：/src/archive/tar/tar_test.go
// Copyright 2012 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"
"errors"
"fmt"
"internal/testenv"
"io"
"io/fs"
"math"
"os"
"path"
"path/filepath"
"reflect"
"strings"
"testing"
"time"
)
type testError struct{ error }
type fileOps []any // []T where T is (string | int64)
// testFile is an io.ReadWriteSeeker where the IO operations performed
// on it must match the list of operations in ops.
type testFile struct {
ops fileOps
pos int64
}
func (f *testFile) Read(b []byte) (int, error) {
if len(b) == 0 {
return 0, nil
}
if len(f.ops) == 0 {
return 0, io.EOF
}
s, ok := f.ops[0].(string)
if !ok {
return 0, errors.New("unexpected Read operation")
}
n := copy(b, s)
if len(s) > n {
f.ops[0] = s[n:]
} else {
f.ops = f.ops[1:]
}
f.pos += int64(len(b))
return n, nil
}
func (f *testFile) Write(b []byte) (int, error) {
if len(b) == 0 {
return 0, nil
}
if len(f.ops) == 0 {
return 0, errors.New("unexpected Write operation")
}
s, ok := f.ops[0].(string)
if !ok {
return 0, errors.New("unexpected Write operation")
}
if !strings.HasPrefix(s, string(b)) {
return 0, testError{fmt.Errorf("got Write(%q), want Write(%q)", b, s)}
}
if len(s) > len(b) {
f.ops[0] = s[len(b):]
} else {
f.ops = f.ops[1:]
}
f.pos += int64(len(b))
return len(b), nil
}
func (f *testFile) Seek(pos int64, whence int) (int64, error) {
if pos == 0 && whence == io.SeekCurrent {
return f.pos, nil
}
if len(f.ops) == 0 {
return 0, errors.New("unexpected Seek operation")
}
s, ok := f.ops[0].(int64)
if !ok {
return 0, errors.New("unexpected Seek operation")
}
if s != pos || whence != io.SeekCurrent {
return 0, testError{fmt.Errorf("got Seek(%d, %d), want Seek(%d, %d)", pos, whence, s, io.SeekCurrent)}
}
f.pos += s
f.ops = f.ops[1:]
return f.pos, nil
}
func equalSparseEntries(x, y []sparseEntry) bool {
return (len(x) == 0 && len(y) == 0) || reflect.DeepEqual(x, y)
}
func TestSparseEntries(t *testing.T) {
vectors := []struct {
in []sparseEntry
size int64
wantValid bool // Result of validateSparseEntries
wantAligned []sparseEntry // Result of alignSparseEntries
wantInverted []sparseEntry // Result of invertSparseEntries
}{{
in: []sparseEntry{}, size: 0,
wantValid: true,
wantInverted: []sparseEntry{{0, 0}},
}, {
in: []sparseEntry{}, size: 5000,
wantValid: true,
wantInverted: []sparseEntry{{0, 5000}},
}, {
in: []sparseEntry{{0, 5000}}, size: 5000,
wantValid: true,
wantAligned: []sparseEntry{{0, 5000}},
wantInverted: []sparseEntry{{5000, 0}},
}, {
in: []sparseEntry{{1000, 4000}}, size: 5000,
wantValid: true,
wantAligned: []sparseEntry{{1024, 3976}},
wantInverted: []sparseEntry{{0, 1000}, {5000, 0}},
}, {
in: []sparseEntry{{0, 3000}}, size: 5000,
wantValid: true,
wantAligned: []sparseEntry{{0, 2560}},
wantInverted: []sparseEntry{{3000, 2000}},
}, {
in: []sparseEntry{{3000, 2000}}, size: 5000,
wantValid: true,
wantAligned: []sparseEntry{{3072, 1928}},
wantInverted: []sparseEntry{{0, 3000}, {5000, 0}},
}, {
in: []sparseEntry{{2000, 2000}}, size: 5000,
wantValid: true,
wantAligned: []sparseEntry{{2048, 1536}},
wantInverted: []sparseEntry{{0, 2000}, {4000, 1000}},
}, {
in: []sparseEntry{{0, 2000}, {8000, 2000}}, size: 10000,
wantValid: true,
wantAligned: []sparseEntry{{0, 1536}, {8192, 1808}},
wantInverted: []sparseEntry{{2000, 6000}, {10000, 0}},
}, {
in: []sparseEntry{{0, 2000}, {2000, 2000}, {4000, 0}, {4000, 3000}, {7000, 1000}, {8000, 0}, {8000, 2000}}, size: 10000,
wantValid: true,
wantAligned: []sparseEntry{{0, 1536}, {2048, 1536}, {4096, 2560}, {7168, 512}, {8192, 1808}},
wantInverted: []sparseEntry{{10000, 0}},
}, {
in: []sparseEntry{{0, 0}, {1000, 0}, {2000, 0}, {3000, 0}, {4000, 0}, {5000, 0}}, size: 5000,
wantValid: true,
wantInverted: []sparseEntry{{0, 5000}},
}, {
in: []sparseEntry{{1, 0}}, size: 0,
wantValid: false,
}, {
in: []sparseEntry{{-1, 0}}, size: 100,
wantValid: false,
}, {
in: []sparseEntry{{0, -1}}, size: 100,
wantValid: false,
}, {
in: []sparseEntry{{0, 0}}, size: -100,
wantValid: false,
}, {
in: []sparseEntry{{math.MaxInt64, 3}, {6, -5}}, size: 35,
wantValid: false,
}, {
in: []sparseEntry{{1, 3}, {6, -5}}, size: 35,
wantValid: false,
}, {
in: []sparseEntry{{math.MaxInt64, math.MaxInt64}}, size: math.MaxInt64,
wantValid: false,
}, {
in: []sparseEntry{{3, 3}}, size: 5,
wantValid: false,
}, {
in: []sparseEntry{{2, 0}, {1, 0}, {0, 0}}, size: 3,
wantValid: false,
}, {
in: []sparseEntry{{1, 3}, {2, 2}}, size: 10,
wantValid: false,
}}
for i, v := range vectors {
gotValid := validateSparseEntries(v.in, v.size)
if gotValid != v.wantValid {
t.Errorf("test %d, validateSparseEntries() = %v, want %v", i, gotValid, v.wantValid)
}
if !v.wantValid {
continue
}
gotAligned := alignSparseEntries(append([]sparseEntry{}, v.in...), v.size)
if !equalSparseEntries(gotAligned, v.wantAligned) {
t.Errorf("test %d, alignSparseEntries():\ngot %v\nwant %v", i, gotAligned, v.wantAligned)
}
gotInverted := invertSparseEntries(append([]sparseEntry{}, v.in...), v.size)
if !equalSparseEntries(gotInverted, v.wantInverted) {
t.Errorf("test %d, inverseSparseEntries():\ngot %v\nwant %v", i, gotInverted, v.wantInverted)
}
}
}
func TestFileInfoHeader(t *testing.T) {
fi, err := os.Stat("testdata/small.txt")
if err != nil {
t.Fatal(err)
}
h, err := FileInfoHeader(fi, "")
if err != nil {
t.Fatalf("FileInfoHeader: %v", err)
}
if g, e := h.Name, "small.txt"; g != e {
t.Errorf("Name = %q; want %q", g, e)
}
if g, e := h.Mode, int64(fi.Mode().Perm()); g != e {
t.Errorf("Mode = %#o; want %#o", g, e)
}
if g, e := h.Size, int64(5); g != e {
t.Errorf("Size = %v; want %v", g, e)
}
if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {
t.Errorf("ModTime = %v; want %v", g, e)
}
// FileInfoHeader should error when passing nil FileInfo
if _, err := FileInfoHeader(nil, ""); err == nil {
t.Fatalf("Expected error when passing nil to FileInfoHeader")
}
}
func TestFileInfoHeaderDir(t *testing.T) {
fi, err := os.Stat("testdata")
if err != nil {
t.Fatal(err)
}
h, err := FileInfoHeader(fi, "")
if err != nil {
t.Fatalf("FileInfoHeader: %v", err)
}
if g, e := h.Name, "testdata/"; g != e {
t.Errorf("Name = %q; want %q", g, e)
}
// Ignoring c_ISGID for golang.org/issue/4867
if g, e := h.Mode&^c_ISGID, int64(fi.Mode().Perm()); g != e {
t.Errorf("Mode = %#o; want %#o", g, e)
}
if g, e := h.Size, int64(0); g != e {
t.Errorf("Size = %v; want %v", g, e)
}
if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {
t.Errorf("ModTime = %v; want %v", g, e)
}
}
func TestFileInfoHeaderSymlink(t *testing.T) {
testenv.MustHaveSymlink(t)
tmpdir := t.TempDir()
link := filepath.Join(tmpdir, "link")
target := tmpdir
if err := os.Symlink(target, link); err != nil {
t.Fatal(err)
}
fi, err := os.Lstat(link)
if err != nil {
t.Fatal(err)
}
h, err := FileInfoHeader(fi, target)
if err != nil {
t.Fatal(err)
}
if g, e := h.Name, fi.Name(); g != e {
t.Errorf("Name = %q; want %q", g, e)
}
if g, e := h.Linkname, target; g != e {
t.Errorf("Linkname = %q; want %q", g, e)
}
if g, e := h.Typeflag, byte(TypeSymlink); g != e {
t.Errorf("Typeflag = %v; want %v", g, e)
}
}
func TestRoundTrip(t *testing.T) {
data := []byte("some file contents")
var b bytes.Buffer
tw := NewWriter(&b)
hdr := &Header{
Name: "file.txt",
Uid: 1 << 21, // Too big for 8 octal digits
Size: int64(len(data)),
ModTime: time.Now().Round(time.Second),
PAXRecords: map[string]string{"uid": "2097152"},
Format: FormatPAX,
Typeflag: TypeReg,
}
if err := tw.WriteHeader(hdr); err != nil {
t.Fatalf("tw.WriteHeader: %v", err)
}
if _, err := tw.Write(data); err != nil {
t.Fatalf("tw.Write: %v", err)
}
if err := tw.Close(); err != nil {
t.Fatalf("tw.Close: %v", err)
}
// Read it back.
tr := NewReader(&b)
rHdr, err := tr.Next()
if err != nil {
t.Fatalf("tr.Next: %v", err)
}
if !reflect.DeepEqual(rHdr, hdr) {
t.Errorf("Header mismatch.\n got %+v\nwant %+v", rHdr, hdr)
}
rData, err := io.ReadAll(tr)
if err != nil {
t.Fatalf("Read: %v", err)
}
if !bytes.Equal(rData, data) {
t.Errorf("Data mismatch.\n got %q\nwant %q", rData, data)
}
}
type headerRoundTripTest struct {
h *Header
fm fs.FileMode
}
func TestHeaderRoundTrip(t *testing.T) {
vectors := []headerRoundTripTest{{
// regular file.
h: &Header{
Name: "test.txt",
Mode: 0644,
Size: 12,
ModTime: time.Unix(1360600916, 0),
Typeflag: TypeReg,
},
fm: 0644,
}, {
// symbolic link.
h: &Header{
Name: "link.txt",
Mode: 0777,
Size: 0,
ModTime: time.Unix(1360600852, 0),
Typeflag: TypeSymlink,
},
fm: 0777 | fs.ModeSymlink,
}, {
// character device node.
h: &Header{
Name: "dev/null",
Mode: 0666,
Size: 0,
ModTime: time.Unix(1360578951, 0),
Typeflag: TypeChar,
},
fm: 0666 | fs.ModeDevice | fs.ModeCharDevice,
}, {
// block device node.
h: &Header{
Name: "dev/sda",
Mode: 0660,
Size: 0,
ModTime: time.Unix(1360578954, 0),
Typeflag: TypeBlock,
},
fm: 0660 | fs.ModeDevice,
}, {
// directory.
h: &Header{
Name: "dir/",
Mode: 0755,
Size: 0,
ModTime: time.Unix(1360601116, 0),
Typeflag: TypeDir,
},
fm: 0755 | fs.ModeDir,
}, {
// fifo node.
h: &Header{
Name: "dev/initctl",
Mode: 0600,
Size: 0,
ModTime: time.Unix(1360578949, 0),
Typeflag: TypeFifo,
},
fm: 0600 | fs.ModeNamedPipe,
}, {
// setuid.
h: &Header{
Name: "bin/su",
Mode: 0755 | c_ISUID,
Size: 23232,
ModTime: time.Unix(1355405093, 0),
Typeflag: TypeReg,
},
fm: 0755 | fs.ModeSetuid,
}, {
// setguid.
h: &Header{
Name: "group.txt",
Mode: 0750 | c_ISGID,
Size: 0,
ModTime: time.Unix(1360602346, 0),
Typeflag: TypeReg,
},
fm: 0750 | fs.ModeSetgid,
}, {
// sticky.
h: &Header{
Name: "sticky.txt",
Mode: 0600 | c_ISVTX,
Size: 7,
ModTime: time.Unix(1360602540, 0),
Typeflag: TypeReg,
},
fm: 0600 | fs.ModeSticky,
}, {
// hard link.
h: &Header{
Name: "hard.txt",
Mode: 0644,
Size: 0,
Linkname: "file.txt",
ModTime: time.Unix(1360600916, 0),
Typeflag: TypeLink,
},
fm: 0644,
}, {
// More information.
h: &Header{
Name: "info.txt",
Mode: 0600,
Size: 0,
Uid: 1000,
Gid: 1000,
ModTime: time.Unix(1360602540, 0),
Uname: "slartibartfast",
Gname: "users",
Typeflag: TypeReg,
},
fm: 0600,
}}
for i, v := range vectors {
fi := v.h.FileInfo()
h2, err := FileInfoHeader(fi, "")
if err != nil {
t.Error(err)
continue
}
if strings.Contains(fi.Name(), "/") {
t.Errorf("FileInfo of %q contains slash: %q", v.h.Name, fi.Name())
}
name := path.Base(v.h.Name)
if fi.IsDir() {
name += "/"
}
if got, want := h2.Name, name; got != want {
t.Errorf("i=%d: Name: got %v, want %v", i, got, want)
}
if got, want := h2.Size, v.h.Size; got != want {
t.Errorf("i=%d: Size: got %v, want %v", i, got, want)
}
if got, want := h2.Uid, v.h.Uid; got != want {
t.Errorf("i=%d: Uid: got %d, want %d", i, got, want)
}
if got, want := h2.Gid, v.h.Gid; got != want {
t.Errorf("i=%d: Gid: got %d, want %d", i, got, want)
}
if got, want := h2.Uname, v.h.Uname; got != want {
t.Errorf("i=%d: Uname: got %q, want %q", i, got, want)
}
if got, want := h2.Gname, v.h.Gname; got != want {
t.Errorf("i=%d: Gname: got %q, want %q", i, got, want)
}
if got, want := h2.Linkname, v.h.Linkname; got != want {
t.Errorf("i=%d: Linkname: got %v, want %v", i, got, want)
}
if got, want := h2.Typeflag, v.h.Typeflag; got != want {
t.Logf("%#v %#v", v.h, fi.Sys())
t.Errorf("i=%d: Typeflag: got %q, want %q", i, got, want)
}
if got, want := h2.Mode, v.h.Mode; got != want {
t.Errorf("i=%d: Mode: got %o, want %o", i, got, want)
}
if got, want := fi.Mode(), v.fm; got != want {
t.Errorf("i=%d: fi.Mode: got %o, want %o", i, got, want)
}
if got, want := h2.AccessTime, v.h.AccessTime; got != want {
t.Errorf("i=%d: AccessTime: got %v, want %v", i, got, want)
}
if got, want := h2.ChangeTime, v.h.ChangeTime; got != want {
t.Errorf("i=%d: ChangeTime: got %v, want %v", i, got, want)
}
if got, want := h2.ModTime, v.h.ModTime; got != want {
t.Errorf("i=%d: ModTime: got %v, want %v", i, got, want)
}
if sysh, ok := fi.Sys().(*Header); !ok || sysh != v.h {
t.Errorf("i=%d: Sys didn't return original *Header", i)
}
}
}
func TestHeaderAllowedFormats(t *testing.T) {
vectors := []struct {
header *Header // Input header
paxHdrs map[string]string // Expected PAX headers that may be needed
formats Format // Expected formats that can encode the header
}{{
header: &Header{},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Size: 077777777777},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Size: 077777777777, Format: FormatUSTAR},
formats: FormatUSTAR,
}, {
header: &Header{Size: 077777777777, Format: FormatPAX},
formats: FormatUSTAR | FormatPAX,
}, {
header: &Header{Size: 077777777777, Format: FormatGNU},
formats: FormatGNU,
}, {
header: &Header{Size: 077777777777 + 1},
paxHdrs: map[string]string{paxSize: "8589934592"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{Size: 077777777777 + 1, Format: FormatPAX},
paxHdrs: map[string]string{paxSize: "8589934592"},
formats: FormatPAX,
}, {
header: &Header{Size: 077777777777 + 1, Format: FormatGNU},
paxHdrs: map[string]string{paxSize: "8589934592"},
formats: FormatGNU,
}, {
header: &Header{Mode: 07777777},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Mode: 07777777 + 1},
formats: FormatGNU,
}, {
header: &Header{Devmajor: -123},
formats: FormatGNU,
}, {
header: &Header{Devmajor: 1<<56 - 1},
formats: FormatGNU,
}, {
header: &Header{Devmajor: 1 << 56},
formats: FormatUnknown,
}, {
header: &Header{Devmajor: -1 << 56},
formats: FormatGNU,
}, {
header: &Header{Devmajor: -1<<56 - 1},
formats: FormatUnknown,
}, {
header: &Header{Name: "用戶名", Devmajor: -1 << 56},
formats: FormatGNU,
}, {
header: &Header{Size: math.MaxInt64},
paxHdrs: map[string]string{paxSize: "9223372036854775807"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{Size: math.MinInt64},
paxHdrs: map[string]string{paxSize: "-9223372036854775808"},
formats: FormatUnknown,
}, {
header: &Header{Uname: "0123456789abcdef0123456789abcdef"},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Uname: "0123456789abcdef0123456789abcdefx"},
paxHdrs: map[string]string{paxUname: "0123456789abcdef0123456789abcdefx"},
formats: FormatPAX,
}, {
header: &Header{Name: "foobar"},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Name: strings.Repeat("a", nameSize)},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Name: strings.Repeat("a", nameSize+1)},
paxHdrs: map[string]string{paxPath: strings.Repeat("a", nameSize+1)},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{Linkname: "用戶名"},
paxHdrs: map[string]string{paxLinkpath: "用戶名"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{Linkname: strings.Repeat("用戶名\x00", nameSize)},
paxHdrs: map[string]string{paxLinkpath: strings.Repeat("用戶名\x00", nameSize)},
formats: FormatUnknown,
}, {
header: &Header{Linkname: "\x00hello"},
paxHdrs: map[string]string{paxLinkpath: "\x00hello"},
formats: FormatUnknown,
}, {
header: &Header{Uid: 07777777},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Uid: 07777777 + 1},
paxHdrs: map[string]string{paxUid: "2097152"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{Xattrs: nil},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Xattrs: map[string]string{"foo": "bar"}},
paxHdrs: map[string]string{paxSchilyXattr + "foo": "bar"},
formats: FormatPAX,
}, {
header: &Header{Xattrs: map[string]string{"foo": "bar"}, Format: FormatGNU},
paxHdrs: map[string]string{paxSchilyXattr + "foo": "bar"},
formats: FormatUnknown,
}, {
header: &Header{Xattrs: map[string]string{"用戶名": "\x00hello"}},
paxHdrs: map[string]string{paxSchilyXattr + "用戶名": "\x00hello"},
formats: FormatPAX,
}, {
header: &Header{Xattrs: map[string]string{"foo=bar": "baz"}},
formats: FormatUnknown,
}, {
header: &Header{Xattrs: map[string]string{"foo": ""}},
paxHdrs: map[string]string{paxSchilyXattr + "foo": ""},
formats: FormatPAX,
}, {
header: &Header{ModTime: time.Unix(0, 0)},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(077777777777, 0)},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(077777777777+1, 0)},
paxHdrs: map[string]string{paxMtime: "8589934592"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(math.MaxInt64, 0)},
paxHdrs: map[string]string{paxMtime: "9223372036854775807"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(math.MaxInt64, 0), Format: FormatUSTAR},
paxHdrs: map[string]string{paxMtime: "9223372036854775807"},
formats: FormatUnknown,
}, {
header: &Header{ModTime: time.Unix(-1, 0)},
paxHdrs: map[string]string{paxMtime: "-1"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(1, 500)},
paxHdrs: map[string]string{paxMtime: "1.0000005"},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(1, 0)},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(1, 0), Format: FormatPAX},
formats: FormatUSTAR | FormatPAX,
}, {
header: &Header{ModTime: time.Unix(1, 500), Format: FormatUSTAR},
paxHdrs: map[string]string{paxMtime: "1.0000005"},
formats: FormatUSTAR,
}, {
header: &Header{ModTime: time.Unix(1, 500), Format: FormatPAX},
paxHdrs: map[string]string{paxMtime: "1.0000005"},
formats: FormatPAX,
}, {
header: &Header{ModTime: time.Unix(1, 500), Format: FormatGNU},
paxHdrs: map[string]string{paxMtime: "1.0000005"},
formats: FormatGNU,
}, {
header: &Header{ModTime: time.Unix(-1, 500)},
paxHdrs: map[string]string{paxMtime: "-0.9999995"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{ModTime: time.Unix(-1, 500), Format: FormatGNU},
paxHdrs: map[string]string{paxMtime: "-0.9999995"},
formats: FormatGNU,
}, {
header: &Header{AccessTime: time.Unix(0, 0)},
paxHdrs: map[string]string{paxAtime: "0"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{AccessTime: time.Unix(0, 0), Format: FormatUSTAR},
paxHdrs: map[string]string{paxAtime: "0"},
formats: FormatUnknown,
}, {
header: &Header{AccessTime: time.Unix(0, 0), Format: FormatPAX},
paxHdrs: map[string]string{paxAtime: "0"},
formats: FormatPAX,
}, {
header: &Header{AccessTime: time.Unix(0, 0), Format: FormatGNU},
paxHdrs: map[string]string{paxAtime: "0"},
formats: FormatGNU,
}, {
header: &Header{AccessTime: time.Unix(-123, 0)},
paxHdrs: map[string]string{paxAtime: "-123"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{AccessTime: time.Unix(-123, 0), Format: FormatPAX},
paxHdrs: map[string]string{paxAtime: "-123"},
formats: FormatPAX,
}, {
header: &Header{ChangeTime: time.Unix(123, 456)},
paxHdrs: map[string]string{paxCtime: "123.000000456"},
formats: FormatPAX | FormatGNU,
}, {
header: &Header{ChangeTime: time.Unix(123, 456), Format: FormatUSTAR},
paxHdrs: map[string]string{paxCtime: "123.000000456"},
formats: FormatUnknown,
}, {
header: &Header{ChangeTime: time.Unix(123, 456), Format: FormatGNU},
paxHdrs: map[string]string{paxCtime: "123.000000456"},
formats: FormatGNU,
}, {
header: &Header{ChangeTime: time.Unix(123, 456), Format: FormatPAX},
paxHdrs: map[string]string{paxCtime: "123.000000456"},
formats: FormatPAX,
}, {
header: &Header{Name: "foo/", Typeflag: TypeDir},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}, {
header: &Header{Name: "foo/", Typeflag: TypeReg},
formats: FormatUnknown,
}, {
header: &Header{Name: "foo/", Typeflag: TypeSymlink},
formats: FormatUSTAR | FormatPAX | FormatGNU,
}}
for i, v := range vectors {
formats, paxHdrs, err := v.header.allowedFormats()
if formats != v.formats {
t.Errorf("test %d, allowedFormats(): got %v, want %v", i, formats, v.formats)
}
if formats&FormatPAX > 0 && !reflect.DeepEqual(paxHdrs, v.paxHdrs) && !(len(paxHdrs) == 0 && len(v.paxHdrs) == 0) {
t.Errorf("test %d, allowedFormats():\ngot %v\nwant %s", i, paxHdrs, v.paxHdrs)
}
if (formats != FormatUnknown) && (err != nil) {
t.Errorf("test %d, unexpected error: %v", i, err)
}
if (formats == FormatUnknown) && (err == nil) {
t.Errorf("test %d, got nil-error, want non-nil error", i)
}
}
}
func Benchmark(b *testing.B) {
type file struct {
hdr *Header
body []byte
}
vectors := []struct {
label string
files []file
}{{
"USTAR",
[]file{{
&Header{Name: "bar", Mode: 0640, Size: int64(3)},
[]byte("foo"),
}, {
&Header{Name: "world", Mode: 0640, Size: int64(5)},
[]byte("hello"),
}},
}, {
"GNU",
[]file{{
&Header{Name: "bar", Mode: 0640, Size: int64(3), Devmajor: -1},
[]byte("foo"),
}, {
&Header{Name: "world", Mode: 0640, Size: int64(5), Devmajor: -1},
[]byte("hello"),
}},
}, {
"PAX",
[]file{{
&Header{Name: "bar", Mode: 0640, Size: int64(3), Xattrs: map[string]string{"foo": "bar"}},
[]byte("foo"),
}, {
&Header{Name: "world", Mode: 0640, Size: int64(5), Xattrs: map[string]string{"foo": "bar"}},
[]byte("hello"),
}},
}}
b.Run("Writer", func(b *testing.B) {
for _, v := range vectors {
b.Run(v.label, func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
// Writing to io.Discard because we want to
// test purely the writer code and not bring in disk performance into this.
tw := NewWriter(io.Discard)
for _, file := range v.files {
if err := tw.WriteHeader(file.hdr); err != nil {
b.Errorf("unexpected WriteHeader error: %v", err)
}
if _, err := tw.Write(file.body); err != nil {
b.Errorf("unexpected Write error: %v", err)
}
}
if err := tw.Close(); err != nil {
b.Errorf("unexpected Close error: %v", err)
}
}
})
}
})
b.Run("Reader", func(b *testing.B) {
for _, v := range vectors {
var buf bytes.Buffer
var r bytes.Reader
// Write the archive to a byte buffer.
tw := NewWriter(&buf)
for _, file := range v.files {
tw.WriteHeader(file.hdr)
tw.Write(file.body)
}
tw.Close()
b.Run(v.label, func(b *testing.B) {
b.ReportAllocs()
// Read from the byte buffer.
for i := 0; i < b.N; i++ {
r.Reset(buf.Bytes())
tr := NewReader(&r)
if _, err := tr.Next(); err != nil {
b.Errorf("unexpected Next error: %v", err)
}
if _, err := io.Copy(io.Discard, tr); err != nil {
b.Errorf("unexpected Copy error : %v", err)
}
}
})
}
})
}
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