This repository has been archived by the owner on Feb 2, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 16
/
stream_in_out_linux.go
169 lines (130 loc) · 3.45 KB
/
stream_in_out_linux.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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
package volume
import (
"io"
"os"
"os/exec"
"path/filepath"
"github.com/concourse/baggageclaim/uidgid"
"github.com/klauspost/compress/zstd"
)
func (streamer *tarZstdStreamer) In(tzstInput io.Reader, dest string, privileged bool) (bool, error) {
tarCommand, dirFd, err := tarCmd(streamer.namespacer, privileged, dest, "-xf", "-")
if err != nil {
return false, err
}
defer dirFd.Close()
zstdDecompressedStream, err := zstd.NewReader(tzstInput)
if err != nil {
return false, err
}
tarCommand.Stdin = zstdDecompressedStream
tarCommand.Stdout = os.Stderr
tarCommand.Stderr = os.Stderr
err = tarCommand.Run()
if err != nil {
zstdDecompressedStream.Close()
if _, ok := err.(*exec.ExitError); ok {
return true, err
}
return false, err
}
zstdDecompressedStream.Close()
return false, nil
}
func (streamer *tarZstdStreamer) Out(tzstOutput io.Writer, src string, privileged bool) error {
fileInfo, err := os.Stat(src)
if err != nil {
return err
}
var tarCommandPath, tarCommandDir string
if fileInfo.IsDir() {
tarCommandPath = "."
tarCommandDir = src
} else {
tarCommandPath = filepath.Base(src)
tarCommandDir = filepath.Dir(src)
}
tarCommand, dirFd, err := tarCmd(streamer.namespacer, privileged, tarCommandDir, "-cf", "-", tarCommandPath)
if err != nil {
return err
}
defer dirFd.Close()
zstdCompressor, err := zstd.NewWriter(tzstOutput)
if err != nil {
return err
}
tarCommand.Stdout = zstdCompressor
tarCommand.Stderr = os.Stderr
err = tarCommand.Run()
if err != nil {
_ = zstdCompressor.Close()
return err
}
err = zstdCompressor.Close()
if err != nil {
return err
}
return nil
}
func (streamer *tarGzipStreamer) In(tgzStream io.Reader, dest string, privileged bool) (bool, error) {
tarCommand, dirFd, err := tarCmd(streamer.namespacer, privileged, dest, "-xz")
if err != nil {
return false, err
}
defer dirFd.Close()
tarCommand.Stdin = tgzStream
tarCommand.Stdout = os.Stderr
tarCommand.Stderr = os.Stderr
err = tarCommand.Run()
if err != nil {
if _, ok := err.(*exec.ExitError); ok {
return true, err
}
return false, err
}
return false, nil
}
func (streamer *tarGzipStreamer) Out(w io.Writer, src string, privileged bool) error {
fileInfo, err := os.Stat(src)
if err != nil {
return err
}
var tarCommandPath, tarCommandDir string
if fileInfo.IsDir() {
tarCommandPath = "."
tarCommandDir = src
} else {
tarCommandPath = filepath.Base(src)
tarCommandDir = filepath.Dir(src)
}
tarCommand, dirFd, err := tarCmd(streamer.namespacer, privileged, tarCommandDir, "-cz", tarCommandPath)
if err != nil {
return err
}
defer dirFd.Close()
tarCommand.Stdout = w
tarCommand.Stderr = os.Stderr
err = tarCommand.Run()
if err != nil {
return err
}
return nil
}
func tarCmd(namespacer uidgid.Namespacer, privileged bool, dir string, args ...string) (*exec.Cmd, *os.File, error) {
// 'tar' may run as MAX_UID in order to remap UIDs when streaming into an
// unprivileged volume. this may cause permission issues when exec'ing as it
// may not be able to even see the destination directory as non-root.
//
// so, open the directory while we're root, and pass it as a fd to the
// process.
dirFd, err := os.Open(dir)
if err != nil {
return nil, nil, err
}
tarCommand := exec.Command("tar", append([]string{"-C", "/dev/fd/3"}, args...)...)
tarCommand.ExtraFiles = []*os.File{dirFd}
if !privileged {
namespacer.NamespaceCommand(tarCommand)
}
return tarCommand, dirFd, nil
}