The layout check skips comments, but the already-fixed check matched `include system-auth` anywhere on a line, so a comment such as `# auth include system-auth` made the migration skip a stack that still listed bare pam_unix, and it was marked complete with the lockout still missing.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
`sudo tee` truncates the live PAM file before writing it, so a migration interrupted in between left /etc/pam.d/polkit-1 empty; the next run then failed the layout check, exited 0, and was marked complete with polkit authentication broken. sed -i writes a temporary file and renames it into place, as the setup commands already do, so the original stays intact until the rewrite is whole and a failed sed needs no restore.
The test's broken-write stub now empties the file instead of discarding the write, so the restore assertion fails if the restore is removed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Codex Medium <noreply@openai.com>
