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
|
//go:build linux
// +build linux
package aufs // import "github.com/docker/docker/daemon/graphdriver/aufs"
import (
"os/exec"
"syscall"
"time"
"github.com/moby/sys/mount"
"github.com/pkg/errors"
"golang.org/x/sys/unix"
)
// Unmount the target specified.
func Unmount(target string) error {
const retries = 5
// auplink flush
for i := 0; ; i++ {
out, err := exec.Command("auplink", target, "flush").CombinedOutput()
if err == nil {
break
}
rc := 0
if exiterr, ok := err.(*exec.ExitError); ok {
if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
rc = status.ExitStatus()
}
}
if i >= retries || rc != int(unix.EINVAL) {
logger.WithError(err).WithField("method", "Unmount").Warnf("auplink flush failed: %s", out)
break
}
// auplink failed to find target in /proc/self/mounts because
// kernel can't guarantee continuity while reading from it
// while mounts table is being changed
logger.Debugf("auplink flush error (retrying %d/%d): %s", i+1, retries, out)
}
// unmount
var err error
for i := 0; i < retries; i++ {
err = mount.Unmount(target)
if err != nil && errors.Is(err, unix.EBUSY) {
logger.Debugf("aufs unmount %s failed with EBUSY (retrying %d/%d)", target, i+1, retries)
time.Sleep(100 * time.Millisecond)
continue // try again
}
break
}
// either no error occurred, or another error
return err
}
|
