The Dockerfile created the minstrel user but never set a WORKDIR or
pre-created a writable data dir. With the default DataDir of "./data"
and CWD of "/", every MkdirAll attempt failed with "permission denied"
under the non-root user, and the boot code only logged a Warn before
continuing. Result: every artist-art enrichment failed at
"mkdir artist-art: mkdir data: permission denied"; the operator saw
"0 successes" with no signal as to why.
Three changes:
- Dockerfile: WORKDIR /app, pre-create /app/data with minstrel
ownership, and ENV MINSTREL_STORAGE_DATA_DIR=/app/data so the
binary doesn't fall back to the broken "./data" default even if
the operator forgets to set it.
- docker-compose.yml: explicit MINSTREL_STORAGE_DATA_DIR + a named
volume mounted at /app/data so cached art persists across
container recreates.
- cmd/minstrel/main.go: MkdirAll failure is now fatal. Silent breakage
here cascades into every cache (playlist covers, artist art,
album-cover fallbacks); refusing to start surfaces the misconfig
immediately. Also wires Enricher.DataDir from cfg in preparation
for the album-cover sidecar fallback (next commit).
Web assets are built in the node stage, copied into the go stage before
go build so //go:embed picks them up, then the minimal slim runtime
carries only the final binary and ffmpeg.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Builder uses golang:1.23-bookworm (matches runner-base:go-ci).
Runtime is debian:bookworm-slim with ffmpeg (server spec §3) plus a
non-root minstrel user. Release workflow builds from this Dockerfile.
bvandeusen