update vendor

vendor/sigs.k8s.io/controller-runtime/pkg/internal/flock/flock_unix.go

@@ -18,18 +18,30 @@ limitations under the License.
 
 package flock
 
-import "golang.org/x/sys/unix"
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"golang.org/x/sys/unix"
+)
 
 // Acquire acquires a lock on a file for the duration of the process. This method
 // is reentrant.
 func Acquire(path string) error {
 	fd, err := unix.Open(path, unix.O_CREAT|unix.O_RDWR|unix.O_CLOEXEC, 0600)
 	if err != nil {
+		if errors.Is(err, os.ErrExist) {
+			return fmt.Errorf("cannot lock file %q: %w", path, ErrAlreadyLocked)
+		}
 		return err
 	}
 
 	// We don't need to close the fd since we should hold
 	// it until the process exits.
-
-	return unix.Flock(fd, unix.LOCK_EX)
+	err = unix.Flock(fd, unix.LOCK_NB|unix.LOCK_EX)
+	if errors.Is(err, unix.EWOULDBLOCK) { // This condition requires LOCK_NB.
+		return fmt.Errorf("cannot lock file %q: %w", path, ErrAlreadyLocked)
+	}
+	return err
 }