### Bug Description If partitions are enabled and a project's parts make use of them, the LifecycleManager will try to prime files from the default prime directory, ignoring any partition prefix. The files do actually exist inside the partition's prime directory, where they are supposed to be. Note also that the specific file that the failure occurs on will randomly be one of the primed files, it isn't always the same one. Don't know if that's relevant. ### To Reproduce Enable and make use of partitions, then prime some file(s) from `stage-packages` (I think?) ### part yaml ```shell kernel: stage-packages: linux-image-generic organize: lib/modules: (mattos-a)/lib/modules prime: (mattos-a)/lib/modules/*/kernel/drivers/net/virtio_net.ko, (mattos-a)/lib/modules/*/modules.builtin, (mattos-a)/lib/modules/*/modules.builtin.modinfo, (mattos-a)/lib/modules/*/modules.order, ``` ### Relevant log output ```shell 2024-08-08 13:56:15.372 execute action kernel:Action(part_name='kernel', step=Step.PRIME, action_type=ActionType.RUN, reason=None, project_vars=None, properties=ActionProperties(changed_files=None, changed_dirs=None)) 2024-08-08 13:56:18.786 /home/mrc/code/willis/mattcraft/examples/coaster-os/prime/lib/modules/5.15.0-118-generic/kernel/drivers/net/virtio_net.ko: No such file or directory 2024-08-08 13:56:18.786 Detailed information: FileNotFoundError: filename: '/home/mrc/code/willis/mattcraft/examples/coaster-os/prime/lib/modules/5.15.0-118-generic/kernel/drivers/net/virtio_net.ko' 2024-08-08 13:56:18.787 Traceback (most recent call last): 2024-08-08 13:56:18.787 File "/home/mrc/code/willis/mattcraft/.direnv/python-3.10.12/lib/python3.10/site-packages/craft_application/services/lifecycle.py", line 261, in run 2024-08-08 13:56:18.787 aex.execute(action, stdout=stream, stderr=stream) 2024-08-08 13:56:18.787 File "/home/mrc/code/willis/craft-parts/craft_parts/executor/executor.py", line 327, in execute 2024-08-08 13:56:18.788 self._executor.execute(actions, stdout=stdout, stderr=stderr) 2024-08-08 13:56:18.788 File "/home/mrc/code/willis/craft-parts/craft_parts/executor/executor.py", line 137, in execute 2024-08-08 13:56:18.788 self._run_action(act, stdout=stdout, stderr=stderr) 2024-08-08 13:56:18.788 File "/home/mrc/code/willis/craft-parts/craft_parts/executor/executor.py", line 214, in _run_action 2024-08-08 13:56:18.788 handler.run_action(action, stdout=stdout, stderr=stderr) 2024-08-08 13:56:18.788 File "/home/mrc/code/willis/craft-parts/craft_parts/executor/part_handler.py", line 170, in run_action 2024-08-08 13:56:18.788 state = handler(step_info, stdout=stdout, stderr=stderr) 2024-08-08 13:56:18.788 File "/home/mrc/code/willis/craft-parts/craft_parts/executor/part_handler.py", line 424, in _run_prime 2024-08-08 13:56:18.788 primed_stage_packages = _get_primed_stage_packages( 2024-08-08 13:56:18.789 File "/home/mrc/code/willis/craft-parts/craft_parts/executor/part_handler.py", line 1140, in _get_primed_stage_packages 2024-08-08 13:56:18.789 stage_package = read_origin_stage_package(snap_file) 2024-08-08 13:56:18.789 File "/home/mrc/code/willis/craft-parts/craft_parts/packages/base.py", line 259, in read_origin_stage_package 2024-08-08 13:56:18.789 return xattrs.read_xattr(path, _STAGE_PACKAGE_KEY) 2024-08-08 13:56:18.789 File "/home/mrc/code/willis/craft-parts/craft_parts/xattrs.py", line 47, in read_xattr 2024-08-08 13:56:18.789 value = os.getxattr(path, key) 2024-08-08 13:56:18.789 FileNotFoundError: [Errno 2] No such file or directory: '/home/mrc/code/willis/mattcraft/examples/coaster-os/prime/lib/modules/5.15.0-118-generic/kernel/drivers/net/virtio_net.ko' ```