### Bug Description The error needs cleanup, the command run is relevant for debugging, we need to clean it up and present the operation and the error from that operation ### To Reproduce run `snapcraft pack` for the presented project ### Environment Ubuntu ### snapcraft.yaml ```shell name: pack-error summary: show bad pack error base: core22 description: | show the not so nice error rendered by snapcraft when pack --check-skeleton errors due to the use of = confinement: strict version: "1.0" grade: stable apps: pack-error: command: pack-error foo=bar parts: pack-error: source: . plugin: dump ``` ### Relevant log output ```shell Executed: pull pack-error Executed: build pack-error Executed: stage pack-error Executed: prime pack-error Executed parts lifecycle Generated snap metadata Running linter: library :: Cannot pack snap file: Command '['snap', 'pack', '--check-skeleton', PosixPath('/home/sergiusens/f/prime')]' returned non-zero exit status 1. (error: cannot validate snap "pack-error": invalid definition of application "pack-error": app description field 'command' contains illegal "pack-error foo=bar" (legal: '^[A-Za-z0-9/. _#:$-]*$')) Running linter: library :: Full execution log: '/home/sergiusens/.local/state/snapcraft/log/snapcraft-20231020-092117.502041.log' ``` ### Additional context ``` $ cat pack-error #!/bin/bash echo "$@" $ ./pack-error foo=bar foo=bar ```