- [x] Have you followed the guidelines for contributing? - [x] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)? - [x] Have you successfully run `make lint && make test`? - [ ] Have you added an entry to the changelog (`docs/reference/changelog.rst`)? --- When using `--debug` to pack an artifact, the current behavior doesn't actually show the error message until the shell is exited. This change makes it so that the error message is printed twice - once just before entering the shell, and again after the shell is closed. An example from Snapcraft: ```yaml # snapcraft.yaml # (...) parts: my-part: plugin: nil override-build: | echo "hello world!" exit 1 ``` ``` ❯ /snap/bin/snapcraft pack --debug Building my-part :: 'override-build' in part 'my-part' failed with code 1. Building my-part :: Detailed information: :: + echo 'hello world!' :: + exit 1 Building my-part :: Recommended resolution: Review the scriptlet and make sure it's correct. Building my-part :: For more information, check out: https://documentation.ubuntu.com/snapcraft/8.12.0.post0+dirty/reference/plugins/ Building my-part :: Full execution log: '/tmp/snapcraft.log' Launching shell on build environment... snapcraft-testing-snap-amd64-11953991 ../project# exit 'override-build' in part 'my-part' failed with code 1. Detailed information: :: + echo 'hello world!' :: + exit 1 Recommended resolution: Review the scriptlet and make sure it's correct. For more information, check out: https://documentation.ubuntu.com/snapcraft/8.12.0.post0+dirty/reference/plugins/ Failed to run snapcraft in instance Full execution log: '/home/imani/.local/state/snapcraft/log/snapcraft-20250908-131159.893419.log' ``` The logs print the error twice as a consequence (craft-cli doesn't let you skip logging an error message), but one is logged from within the container, denoted by the `::` prefix. This only happens when using `--debug`. Requires https://github.com/canonical/craft-cli/pull/381. CRAFT-4703.