MetaAppStore/Apps/MetaFeederMusicBrainz/rationale.md

MetaFeeder · MusicBrainz — Rationale

What deviation / exception is being requested

metafeedermusicbrainz-feeder runs user: 0:0.

Why it is necessary

Carried over unchanged from the MetaFeeder listings this app is a sibling of, so the feeder behaves exactly as they do. The MetaFeeder images write their state and redb cache as the container user and some reach MetaCore's root-owned tree; a uid-1000 process is refused.

Security mitigations in place

• Public ingress terminates at the AppShield sidecar (ghcr.io/yundera/appshield:2.0.9), which gates every path behind the PCS's Authelia SSO over OIDC. The feeder carries no Caddy labels and publishes no host port, so it is reachable only from the pcs Docker network.
• The container mounts no user directories — not /DATA/Documents, /DATA/Downloads, /DATA/Media or /DATA/Gallery. Its only bind is its own state under /DATA/AppData/metafeedermusicbrainz/, declared in x-compose-app.folders and owned $PUID:$PGID.
• cpu_shares and a hard mem_limit (swap disabled) set on every service; image tags pinned; no :latest.

Alternatives considered and rejected

• Run as $PUID:$PGID. Not validated for this image; the sibling MetaFeeder apps all run 0:0, and changing the runtime user here would make this listing the odd one out for no measured benefit.

Data protection

The feeder holds no user media. Its entire state lives under /DATA/AppData/metafeedermusicbrainz/, which is the unit Maison archives on uninstall and restores from backup.