forked from ponzu-cms/ponzu
/
archive.go
114 lines (95 loc) · 1.82 KB
/
archive.go
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
package backup
import (
"archive/tar"
"compress/gzip"
"context"
"fmt"
"io"
"os"
"path/filepath"
)
// ArchiveFS walks the filesystem starting from basedir writing files encountered
// tarred and gzipped to the provided writer
func ArchiveFS(ctx context.Context, basedir string, w io.Writer) error {
gz := gzip.NewWriter(w)
tarball := tar.NewWriter(gz)
absPath, err := filepath.Abs(basedir)
if err != nil {
return err
}
info, err := os.Lstat(absPath)
if err != nil {
return err
}
if info.Mode()&os.ModeSymlink == os.ModeSymlink {
// This is a symlink - we need to follow it
bdir, err := os.Readlink(absPath)
if err != nil {
return err
}
basedir = bdir
}
errChan := make(chan error, 1)
walkFn := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
hdr, err := tar.FileInfoHeader(info, "")
if err != nil {
return err
}
hdr.Name = path
err = tarball.WriteHeader(hdr)
if err != nil {
return err
}
if !info.IsDir() {
src, err := os.Open(path)
if err != nil {
return err
}
defer src.Close()
_, err = io.Copy(tarball, src)
if err != nil {
return err
}
err = tarball.Flush()
if err != nil {
return err
}
err = gz.Flush()
if err != nil {
return err
}
}
return nil
}
// stop processing if we get a cancellation signal
err = filepath.Walk(basedir, func(path string, info os.FileInfo, err error) error {
go func() { errChan <- walkFn(path, info, err) }()
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
return err
}
case err := <-errChan:
if err != nil {
return err
}
}
return nil
})
if err != nil {
fmt.Println(err)
return err
}
err = gz.Close()
if err != nil {
return err
}
err = tarball.Close()
if err != nil {
return err
}
return nil
}