Intermittently when doing `charmcraft pack` I am hitting a `pack` that will run indefinitely. This has happened when using a 'charmcraft.yaml' file that includes: ``` parts: kubectl: plugin: dump source: . override-pull: | curl -sSLO https://dl.k8s.io/release/v1.22.1/bin/linux/amd64/kubectl chmod +x kubectl build-packages: - curl ``` Where the logs show I'm stuck on: ``` 2021-09-21 15:19:53,069 craft_parts.executor.executor DEBUG execute action charm:Action(part_name='charm', step=Step.PULL, action_type=ActionType.UPDATE, reason='source changed'). ``` I cannot consistently reproduce this, but when it does happen it will continually happen (kill+rerun `charmcraft pack` yields the same result). Deleting the `./build` directory seems to fix the issue and the next pack will work fine. When this error does occur, a few lines above the stuck action I see: ``` 2021-09-21 15:26:54,885 craft_parts.sources.local_source DEBUG ignore patterns: ['*.charm', 'build', '*.charm' ...] ``` where the `...` has **many** repeats of "'*.charm', 'build'" (enough to fill my terminal history). Something similar can be reproduced by using the above `charmcraft.yaml` snippet to `pack` the `charmcraft init` template twice in a row. The first `charmcraft pack` will show a small entry for ignore patterns, with the second `pack` showing something like: ``` 2021-09-22 18:34:08,551 craft_parts.sources.local_source DEBUG ignore patterns: ['*.charm', 'build', '*.charm', 'build', '*.charm', 'build', '*.charm', 'build', 'build', '*.charm', 'build', '*.charm', 'build', '*.charm', 'build', '*.charm', 'build', 'build', '*.charm', 'build', '*.charm', 'build', '*.charm', 'build', '*.charm', 'build', 'build', '*.charm', 'build', '*.charm', 'build', '*.charm', 'build', '*.charm', 'build', 'build', 'build', 'build'] ```