Uninstall() should not fail if a cgroup directory doesn't exist

It can be occurred if two controllers are mounted together or if Uninstall() is called on a error path.

PiperOrigin-RevId: 218723886
Change-Id: I69d7a3c0685a7da38527ea8b7b301dbe96268285

1 files changed, 5 insertions, 1 deletions

diff --git a/runsc/cgroup/cgroup.go b/runsc/cgroup/cgroup.go
index 0ceeb3f28..15071387b 100644
--- a/runsc/cgroup/cgroup.go
+++ b/runsc/cgroup/cgroup.go
@@ -229,7 +229,11 @@ func (c *Cgroup) Uninstall() error {
 		defer cancel()
 		b := backoff.WithContext(backoff.NewConstantBackOff(100*time.Millisecond), ctx)
 		if err := backoff.Retry(func() error {
-			return syscall.Rmdir(path)
+			err := syscall.Rmdir(path)
+			if os.IsNotExist(err) {
+				return nil
+			}
+			return err
 		}, b); err != nil {
 			return fmt.Errorf("error removing cgroup path %q: %v", path, err)
 		}