forked from docker/machine
-
Notifications
You must be signed in to change notification settings - Fork 0
/
utils.go
136 lines (116 loc) · 2.67 KB
/
utils.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
package mcnutils
import (
"crypto/rand"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"os"
"runtime"
"strconv"
"time"
"github.com/docker/machine/libmachine/log"
)
// GetHomeDir returns the home directory
// TODO: Having this here just strikes me as dangerous, but some of the drivers
// depend on it ;_;
func GetHomeDir() string {
if runtime.GOOS == "windows" {
return os.Getenv("USERPROFILE")
}
return os.Getenv("HOME")
}
func GetUsername() string {
u := "unknown"
osUser := ""
switch runtime.GOOS {
case "darwin", "linux":
osUser = os.Getenv("USER")
case "windows":
osUser = os.Getenv("USERNAME")
}
if osUser != "" {
u = osUser
}
return u
}
func CopyFile(src, dst string) error {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
if _, err = io.Copy(out, in); err != nil {
return err
}
fi, err := os.Stat(src)
if err != nil {
return err
}
if err := os.Chmod(dst, fi.Mode()); err != nil {
return err
}
return nil
}
func WaitForSpecificOrError(f func() (bool, error), maxAttempts int, waitInterval time.Duration) error {
for i := 0; i < maxAttempts; i++ {
stop, err := f()
if err != nil {
return err
}
if stop {
return nil
}
time.Sleep(waitInterval)
}
return fmt.Errorf("Maximum number of retries (%d) exceeded", maxAttempts)
}
func WaitForSpecific(f func() bool, maxAttempts int, waitInterval time.Duration) error {
return WaitForSpecificOrError(func() (bool, error) {
return f(), nil
}, maxAttempts, waitInterval)
}
func WaitFor(f func() bool) error {
return WaitForSpecific(f, 60, 3*time.Second)
}
func DumpVal(vals ...interface{}) {
for _, val := range vals {
prettyJSON, err := json.MarshalIndent(val, "", " ")
if err != nil {
log.Warn(err)
}
log.Debug(string(prettyJSON))
}
}
// TruncateID returns a shorten id
// Following two functions are from github.com/docker/docker/utils module. It
// was way overkill to include the whole module, so we just have these bits
// that we're using here.
func TruncateID(id string) string {
shortLen := 12
if len(id) < shortLen {
shortLen = len(id)
}
return id[:shortLen]
}
// GenerateRandomID returns an unique id
func GenerateRandomID() string {
for {
id := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, id); err != nil {
panic(err) // This shouldn't happen
}
value := hex.EncodeToString(id)
// if we try to parse the truncated for as an int and we don't have
// an error then the value is all numeric and causes issues when
// used as a hostname. ref #3869
if _, err := strconv.ParseInt(TruncateID(value), 10, 64); err == nil {
continue
}
return value
}
}