Forbid exec a restarting container

Currently if we exec a restarting container, client will fail silently,
and daemon will print error that container can't be found which is not a
very meaningful prompt to user.

This commit will stop user from exec a restarting container and gives
more explicit error message.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
Upstream-commit: 1d2208fed90da9ab72ded3b1c65bb2a71b66ce93
Component: engine

components/engine/daemon/exec.go

@@ -52,6 +52,9 @@ func (d *Daemon) getExecConfig(name string) (*exec.Config, error) {
 			if container.IsPaused() {
 				return nil, derr.ErrorCodeExecPaused.WithArgs(container.ID)
 			}
+			if container.IsRestarting() {
+				return nil, derr.ErrorCodeExecRestarting.WithArgs(container.ID)
+			}
 			return ec, nil
 		}
 	}
@@ -76,6 +79,9 @@ func (d *Daemon) getActiveContainer(name string) (*container.Container, error) {
 	if container.IsPaused() {
 		return nil, derr.ErrorCodeExecPaused.WithArgs(name)
 	}
+	if container.IsRestarting() {
+		return nil, derr.ErrorCodeExecRestarting.WithArgs(name)
+	}
 	return container, nil
 }