Sometimes, the `rockcraft pack` command will fail with the following error, ```sh Failed to copy image: Command '['umoci', 'init', '--layout', '/root/images/bare']' returned non-zero exit status 1. (⨯ image layout creation: path already exists: /root/images/bare) 2022-05-19 12:28:58.701 Traceback (most recent call last): 2022-05-19 12:28:58.702 File "/snap/rockcraft/x1/lib/python3.8/site-packages/rockcraft/oci.py", line 239, in _process_run 2022-05-19 12:28:58.705 subprocess.run( 2022-05-19 12:28:58.705 File "/snap/rockcraft/x1/usr/lib/python3.8/subprocess.py", line 516, in run 2022-05-19 12:28:58.705 raise CalledProcessError(retcode, process.args, 2022-05-19 12:28:58.705 subprocess.CalledProcessError: Command '['umoci', 'init', '--layout', '/root/images/bare']' returned non-zero exit status 1. 2022-05-19 12:28:58.707 Full execution log: '/root/.cache/rockcraft/log/rockcraft-20220519-122857.121178.log' ``` a way to reproduce that seem to be, 1. build a part with multiple stage packages 2. remove a package from the list 3. try to rebuild the part