Cedapug's build script writes .cedapug/manifest.tsv with mode 0600 owned
by l4d2-sandbox; the web service (left4me uid) then 500s when streaming
that file via the download route — PermissionError on open().
Two fixes:
- UMask=0022 on the systemd-run unit so new file writes default to
0644 / dirs to 0755.
- Post-script chmod o+r/o+rx walk over the overlay dir to backfill any
stricter modes the script left behind (e.g. shells/tools that ignore
umask and explicitly create with 0600).
The helper no longer execs systemd-run; it captures the rc, runs the
post-step, and exits with the original rc.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
965b67e6fc