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sunken-ship: mulbo-server-backfill systemd oneshot

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Companion oneshot for mulbo-server: populates the dedup index
(tracks_index) from Navidrome's existing 15k tracks. Without it,
GET /tracks/by-hash misses for every existing offshore track and
the upload path duplicates content.

Inherits same User/SupplementaryGroups as the running service.
chromaprint added to PATH for fpcalc. TimeoutSec=8h covers full
274 GB hashing run with headroom.

Triggered manually — not auto-scheduled:
  sudo systemctl start mulbo-server-backfill
  journalctl -fu mulbo-server-backfill

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
DannyDannyDanny 2026-05-07 22:30:05 +02:00
parent 082529dac9
commit 4525e73f1a
1 changed files with 32 additions and 0 deletions
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32
nixos/hosts/sunken-ship.nix
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@ -297,6 +297,38 @@
timerConfig.RandomizedDelaySec = "2min"; timerConfig.RandomizedDelaySec = "2min";
}; };
# One-shot backfill: walks Navidrome's media_file, computes
# (sha256, chromaprint) per file, populates mulbo-server's tracks_index
# with the corresponding navidrome_track_id. Idempotent — existing rows
# left alone. Without this, /tracks/by-hash misses for every existing
# offshore track and `mulbo reconcile-local` duplicates content.
#
# Trigger manually: sudo systemctl start mulbo-server-backfill
# Follow progress: journalctl -fu mulbo-server-backfill
systemd.services.mulbo-server-backfill = let
pythonEnv = pkgs.python312.withPackages (ps: with ps; [ ]);
in {
description = "Backfill mulbo-server tracks_index from Navidrome catalog";
after = [ "mulbo-server.service" ];
requires = [ "mulbo-server.service" ];
path = [ pkgs.chromaprint ]; # provides fpcalc
environment = {
MULBO_INDEX_DB = "/var/lib/mulbo-server/index.db";
MULBO_NAVIDROME_DB = "/var/lib/navidrome/navidrome.db";
MULBO_MUSIC_ROOT = "/srv/music";
PYTHONUNBUFFERED = "1";
};
serviceConfig = {
Type = "oneshot";
WorkingDirectory = "/home/danny/python-projects/20_mulbo";
ExecStart = "${pythonEnv}/bin/python mulbo_server/backfill.py";
User = "danny";
SupplementaryGroups = [ "navidrome" ]; # ro access to navidrome.db
StateDirectory = "mulbo-server"; # so /var/lib/mulbo-server/index.db stays writable
TimeoutSec = "8h"; # full backfill on 274 GB ≈ 1h, leave headroom
};
};
# Auto-rebuild service/timer + safe.directory provided by the # Auto-rebuild service/timer + safe.directory provided by the
# shared dotfiles-rebuild NixOS module (see nixos/modules/dotfiles-rebuild.nix). # shared dotfiles-rebuild NixOS module (see nixos/modules/dotfiles-rebuild.nix).
} }