update c/common to latest

includes the slirp4netns package

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

vendor/github.com/containers/common/pkg/util/util.go

@@ -3,11 +3,16 @@ package util
 import (
 	"bytes"
 	"fmt"
+	"os"
 	"os/exec"
+	"path/filepath"
 	"regexp"
 	"strings"
+	"time"
 
 	"github.com/containers/common/libnetwork/types"
+	"github.com/fsnotify/fsnotify"
+	"github.com/sirupsen/logrus"
 )
 
 const (
@@ -131,3 +136,54 @@ func FilterID(id string, filters []string) bool {
 	}
 	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 := os.Stat(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 := os.Stat(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)
+		}
+	}
+}