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fix(docker): pin matplotlib cache to /tmp so the STL thumbnail generator stops logging EPERM

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Matplotlib (imported lazily by stl_thumbnail.py) tried to create its
  font/style cache at $HOME/.config/matplotlib on first STL upload.
  HOME=/app per the Dockerfile but /app is root-owned and not writable
  by the PUID:PGID the entrypoint drops to, so matplotlib logged
  "Permission denied" and fell back to /tmp/matplotlib-* — wiped on
  every restart, paying the font-scan cost again on the next STL.

  Add ENV MPLCONFIGDIR=/tmp/matplotlib to make the cache directory
  writable and persistent across the container's lifetime. /tmp is
  writable by any uid, so this works regardless of PUID.
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maziggy
2026-05-16 09:47:05 +02:00
parent 072b8c8ce1
commit 8e241915ae
2 changed files with 12 additions and 0 deletions
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Dockerfile
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@@ -121,6 +121,16 @@ ENV HOME=/app
ENV USER=bambuddy
ENV LOGNAME=bambuddy
# Matplotlib (imported lazily by the STL thumbnail generator) tries to create
# its font/style cache at $HOME/.config/matplotlib on first import. /app is
# root-owned and not writable by the PUID:PGID the entrypoint drops to,
# which trips an EPERM warning in everyone's logs and forces matplotlib
# to fall back to a per-restart temp dir (paying the font-scan cost on
# every container restart). Pinning the cache dir to /tmp/matplotlib
# silences the warning and keeps the cache alive for the container's
# lifetime. /tmp is writable by any uid, so this works regardless of PUID.
ENV MPLCONFIGDIR=/tmp/matplotlib
EXPOSE 322
EXPOSE 990
EXPOSE 3000