-
Notifications
You must be signed in to change notification settings - Fork 41
/
windows_writer.go
102 lines (87 loc) · 2 KB
/
windows_writer.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
package layer
import (
"archive/tar"
"io"
"path"
"strings"
)
type WindowsWriter struct {
tarWriter *tar.Writer
writtenParentPaths map[string]bool
}
func NewWindowsWriter(fileWriter io.Writer) *WindowsWriter {
return &WindowsWriter{
tarWriter: tar.NewWriter(fileWriter),
writtenParentPaths: map[string]bool{},
}
}
func (w *WindowsWriter) Write(content []byte) (int, error) {
return w.tarWriter.Write(content)
}
func (w *WindowsWriter) WriteHeader(header *tar.Header) error {
if err := w.initializeLayer(); err != nil {
return err
}
header.Name = layerFilesPath(header.Name)
err := w.writeParentPaths(header.Name)
if err != nil {
return err
}
if header.Typeflag == tar.TypeDir {
return w.writeDirHeader(header)
}
return w.tarWriter.WriteHeader(header)
}
func (w *WindowsWriter) Close() (err error) {
defer func() {
closeErr := w.tarWriter.Close()
if err == nil {
err = closeErr
}
}()
return w.initializeLayer()
}
func (w *WindowsWriter) Flush() error {
return w.tarWriter.Flush()
}
func (w *WindowsWriter) writeParentPaths(childPath string) error {
var parentDir string
for _, pathPart := range strings.Split(path.Dir(childPath), "/") {
parentDir = path.Join(parentDir, pathPart)
if err := w.writeDirHeader(&tar.Header{
Name: parentDir,
Typeflag: tar.TypeDir,
}); err != nil {
return err
}
}
return nil
}
func layerFilesPath(origPath string) string {
return path.Join("Files", origPath)
}
func (w *WindowsWriter) initializeLayer() error {
if err := w.writeDirHeader(&tar.Header{
Name: "Files",
Typeflag: tar.TypeDir,
}); err != nil {
return err
}
if err := w.writeDirHeader(&tar.Header{
Name: "Hives",
Typeflag: tar.TypeDir,
}); err != nil {
return err
}
return nil
}
func (w *WindowsWriter) writeDirHeader(header *tar.Header) error {
if w.writtenParentPaths[header.Name] {
return nil
}
if err := w.tarWriter.WriteHeader(header); err != nil {
return err
}
w.writtenParentPaths[header.Name] = true
return nil
}