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
|
package util
import (
"fmt"
"os"
"path/filepath"
"regexp"
"time"
"github.com/fsnotify/fsnotify"
"github.com/sirupsen/logrus"
"go.podman.io/storage/pkg/fileutils"
)
// StringMatchRegexSlice determines if a given string matches one of the given regexes, returns bool.
func StringMatchRegexSlice(s string, re []string) bool {
for _, r := range re {
m, err := regexp.MatchString(r, s)
if err == nil && m {
return true
}
}
return false
}
// WaitForFile waits until a file has been created or the given timeout has occurred.
func WaitForFile(path string, chWait chan error, timeout time.Duration) (bool, error) {
var inotifyEvents chan fsnotify.Event
watcher, err := fsnotify.NewWatcher()
if err == nil {
if err := watcher.Add(filepath.Dir(path)); err == nil {
inotifyEvents = watcher.Events
}
defer func() {
if err := watcher.Close(); err != nil {
logrus.Errorf("Failed to close fsnotify watcher: %v", err)
}
}()
}
var timeoutChan <-chan time.Time
if timeout != 0 {
timeoutChan = time.After(timeout)
}
for {
select {
case e := <-chWait:
return true, e
case <-inotifyEvents:
err := fileutils.Exists(path)
if err == nil {
return false, nil
}
if !os.IsNotExist(err) {
return false, err
}
case <-time.After(25 * time.Millisecond):
// Check periodically for the file existence. It is needed
// if the inotify watcher could not have been created. It is
// also useful when using inotify as if for any reasons we missed
// a notification, we won't hang the process.
err := fileutils.Exists(path)
if err == nil {
return false, nil
}
if !os.IsNotExist(err) {
return false, err
}
case <-timeoutChan:
return false, fmt.Errorf("timed out waiting for file %s", path)
}
}
}
|
