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
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
package archiver
import (
"fmt"
"io"
"strings"
"github.com/dsnet/compress/bzip2"
)
// TarBz2 facilitates bzip2 compression
// (https://github.com/dsnet/compress/blob/master/doc/bzip2-format.pdf)
// of tarball archives.
type TarBz2 struct {
*Tar
CompressionLevel int
}
// CheckExt ensures the file extension matches the format.
func (*TarBz2) CheckExt(filename string) error {
if !strings.HasSuffix(filename, ".tar.bz2") &&
!strings.HasSuffix(filename, ".tbz2") {
return fmt.Errorf("filename must have a .tar.bz2 or .tbz2 extension")
}
return nil
}
// Archive creates a compressed tar file at destination
// containing the files listed in sources. The destination
// must end with ".tar.bz2" or ".tbz2". File paths can be
// those of regular files or directories; directories will
// be recursively added.
func (tbz2 *TarBz2) Archive(sources []string, destination string) error {
err := tbz2.CheckExt(destination)
if err != nil {
return fmt.Errorf("output %s", err.Error())
}
tbz2.wrapWriter()
return tbz2.Tar.Archive(sources, destination)
}
// Unarchive unpacks the compressed tarball at
// source to destination. Destination will be
// treated as a folder name.
func (tbz2 *TarBz2) Unarchive(source, destination string) error {
tbz2.wrapReader()
return tbz2.Tar.Unarchive(source, destination)
}
// Walk calls walkFn for each visited item in archive.
func (tbz2 *TarBz2) Walk(archive string, walkFn WalkFunc) error {
tbz2.wrapReader()
return tbz2.Tar.Walk(archive, walkFn)
}
// Create opens tbz2 for writing a compressed
// tar archive to out.
func (tbz2 *TarBz2) Create(out io.Writer) error {
tbz2.wrapWriter()
return tbz2.Tar.Create(out)
}
// Open opens t for reading a compressed archive from
// in. The size parameter is not used.
func (tbz2 *TarBz2) Open(in io.Reader, size int64) error {
tbz2.wrapReader()
return tbz2.Tar.Open(in, size)
}
// Extract extracts a single file from the tar archive.
// If the target is a directory, the entire folder will
// be extracted into destination.
func (tbz2 *TarBz2) Extract(source, target, destination string) error {
tbz2.wrapReader()
return tbz2.Tar.Extract(source, target, destination)
}
func (tbz2 *TarBz2) wrapWriter() {
var bz2w *bzip2.Writer
tbz2.Tar.writerWrapFn = func(w io.Writer) (io.Writer, error) {
var err error
bz2w, err = bzip2.NewWriter(w, &bzip2.WriterConfig{
Level: tbz2.CompressionLevel,
})
return bz2w, err
}
tbz2.Tar.cleanupWrapFn = func() {
bz2w.Close()
}
}
func (tbz2 *TarBz2) wrapReader() {
var bz2r *bzip2.Reader
tbz2.Tar.readerWrapFn = func(r io.Reader) (io.Reader, error) {
var err error
bz2r, err = bzip2.NewReader(r, nil)
return bz2r, err
}
tbz2.Tar.cleanupWrapFn = func() {
bz2r.Close()
}
}
func (tbz2 *TarBz2) String() string { return "tar.bz2" }
// NewTarBz2 returns a new, default instance ready to be customized and used.
func NewTarBz2() *TarBz2 {
return &TarBz2{
CompressionLevel: bzip2.DefaultCompression,
Tar: NewTar(),
}
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Reader(new(TarBz2))
_ = Writer(new(TarBz2))
_ = Archiver(new(TarBz2))
_ = Unarchiver(new(TarBz2))
_ = Walker(new(TarBz2))
_ = Extractor(new(TarBz2))
)
// DefaultTarBz2 is a convenient archiver ready to use.
var DefaultTarBz2 = NewTarBz2()
|
