forked from rancher/os
/
util.go
184 lines (151 loc) · 3.09 KB
/
util.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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
package util
import (
"archive/tar"
"fmt"
"io"
"math/rand"
"os"
"path"
"syscall"
"github.com/docker/docker/pkg/mount"
"gopkg.in/yaml.v2"
)
var (
letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
)
func mountProc() error {
if _, err := os.Stat("/proc/self/mountinfo"); os.IsNotExist(err) {
if _, err := os.Stat("/proc"); os.IsNotExist(err) {
if err = os.Mkdir("/proc", 0755); err != nil {
return err
}
}
if err := syscall.Mount("none", "/proc", "proc", 0, ""); err != nil {
return err
}
}
return nil
}
func Mount(device, directory, fsType, options string) error {
if err := mountProc(); err != nil {
return nil
}
if _, err := os.Stat(directory); os.IsNotExist(err) {
err = os.MkdirAll(directory, 0755)
if err != nil {
return err
}
}
return mount.Mount(device, directory, fsType, options)
}
func Remount(directory, options string) error {
return mount.Mount("", directory, "", fmt.Sprintf("remount,%s", options))
}
func ExtractTar(archive string, dest string) error {
f, err := os.Open(archive)
if err != nil {
return err
}
defer f.Close()
input := tar.NewReader(f)
for {
header, err := input.Next()
if err == io.EOF {
break
} else if err != nil {
return err
}
if header == nil {
break
}
fileInfo := header.FileInfo()
fileName := path.Join(dest, header.Name)
if fileInfo.IsDir() {
//log.Debugf("DIR : %s", fileName)
err = os.MkdirAll(fileName, fileInfo.Mode())
if err != nil {
return err
}
} else {
//log.Debugf("FILE: %s", fileName)
destFile, err := os.OpenFile(fileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, fileInfo.Mode())
if err != nil {
return err
}
_, err = io.Copy(destFile, input)
// Not deferring, concerned about holding open too many files
destFile.Close()
if err != nil {
return err
}
}
}
return nil
}
func Contains(values []string, value string) bool {
if len(value) == 0 {
return false
}
for _, i := range values {
if i == value {
return true
}
}
return false
}
type ReturnsErr func() error
func ShortCircuit(funcs ...ReturnsErr) error {
for _, f := range funcs {
err := f()
if err != nil {
return err
}
}
return nil
}
type ErrWriter struct {
w io.Writer
Err error
}
func NewErrorWriter(w io.Writer) *ErrWriter {
return &ErrWriter{
w: w,
}
}
func (e *ErrWriter) Write(buf []byte) *ErrWriter {
if e.Err != nil {
return e
}
_, e.Err = e.w.Write(buf)
return e
}
func RandSeq(n int) string {
b := make([]rune, n)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}
func Convert(from, to interface{}) error {
bytes, err := yaml.Marshal(from)
if err != nil {
return err
}
return yaml.Unmarshal(bytes, to)
}
func MergeMaps(left, right map[interface{}]interface{}) {
for k, v := range right {
merged := false
if existing, ok := left[k]; ok {
if rightMap, ok := v.(map[interface{}]interface{}); ok {
if leftMap, ok := existing.(map[interface{}]interface{}); ok {
merged = true
MergeMaps(leftMap, rightMap)
}
}
}
if !merged {
left[k] = v
}
}
}