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
|
package libvirt
import (
"crypto/rand"
"fmt"
"log"
"time"
)
var diskLetters []rune = []rune("abcdefghijklmnopqrstuvwxyz")
func DiskLetterForIndex(i int) string {
q := i / len(diskLetters)
r := i % len(diskLetters)
letter := diskLetters[r]
if q == 0 {
return fmt.Sprintf("%c", letter)
}
return fmt.Sprintf("%s%c", DiskLetterForIndex(q-1), letter)
}
// wait for success and timeout after 5 minutes.
func WaitForSuccess(errorMessage string, f func() error) error {
start := time.Now()
for {
err := f()
if err == nil {
return nil
}
log.Printf("[DEBUG] %s. Re-trying.\n", err)
time.Sleep(1 * time.Second)
if time.Since(start) > 5*time.Minute {
return fmt.Errorf("%s: %s", errorMessage, err)
}
}
}
func RandomMACAddress() (string, error) {
buf := make([]byte, 6)
_, err := rand.Read(buf)
if err != nil {
return "", err
}
// set local bit and unicast
buf[0] = (buf[0] | 2) & 0xfe
// Set the local bit
buf[0] |= 2
return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]), nil
}
|