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sunken-ship: grant mulbo-server read on navidrome.db

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mulbo-server's /folders endpoint reads navidrome.db directly because
the Subsonic API's path field is tag-virtual (not real fs paths).

Three pieces:
- services.navidrome UMask = 0027 (force) so future DB writes are
  group-readable; default was 0077.
- tmpfiles z-rules to chmod 0640 the existing navidrome.db, -wal, -shm
  (created under the old umask).
- mulbo-server gets SupplementaryGroups=[navidrome] so the unit's
  process can read those files.

Trade-off: couples mulbo-server to Navidrome's schema (specifically
media_file.id + media_file.path). Acceptable given Navidrome 0.61.1
has been stable on these columns; we'll catch breakage at the /health
navidrome_db_readable probe.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
DannyDannyDanny 2026-05-06 15:06:51 +02:00
parent 4debab6f69
commit 73d4225f9b
1 changed files with 23 additions and 7 deletions
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30
nixos/hosts/sunken-ship.nix
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@ -113,6 +113,13 @@
}; };
}; };
# Navidrome's Subsonic API path field is tag-virtual; only the internal
# SQLite has real fs paths. mulbo-server reads navidrome.db ro to
# power /folders + POST /tracks resolution. UMask=0027 makes new DB
# files (and WAL rotations) group-readable; the tmpfile rule fixes the
# existing files written under the previous 0600 umask.
systemd.services.navidrome.serviceConfig.UMask = lib.mkForce "0027";
# Persist the bind mount so navidrome can read music outside ProtectHome. # Persist the bind mount so navidrome can read music outside ProtectHome.
fileSystems."/srv/music" = { fileSystems."/srv/music" = {
device = "/home/danny/music"; device = "/home/danny/music";
@ -212,6 +219,12 @@
# reads via the existing /srv/music ro bind-mount with no mount changes. # reads via the existing /srv/music ro bind-mount with no mount changes.
systemd.tmpfiles.rules = [ systemd.tmpfiles.rules = [
"d /home/danny/music/mulbo-uploads 0755 danny users -" "d /home/danny/music/mulbo-uploads 0755 danny users -"
# One-time fix for the existing navidrome.db (+ WAL/SHM) created
# under the old 0600 umask. UMask=0027 above keeps future writes
# group-readable.
"z /var/lib/navidrome/navidrome.db 0640 navidrome navidrome -"
"z /var/lib/navidrome/navidrome.db-wal 0640 navidrome navidrome -"
"z /var/lib/navidrome/navidrome.db-shm 0640 navidrome navidrome -"
]; ];
systemd.services.mulbo-server = let systemd.services.mulbo-server = let
@ -235,18 +248,21 @@
PYTHONUNBUFFERED = "1"; # immediate journal output PYTHONUNBUFFERED = "1"; # immediate journal output
}; };
serviceConfig = { serviceConfig = {
WorkingDirectory = "/home/danny/python-projects/20_mulbo"; WorkingDirectory = "/home/danny/python-projects/20_mulbo";
ExecStart = "${pythonEnv}/bin/python mulbo_server/app.py"; ExecStart = "${pythonEnv}/bin/python mulbo_server/app.py";
Restart = "on-failure"; Restart = "on-failure";
RestartSec = 5; RestartSec = 5;
User = "danny"; User = "danny";
StateDirectory = "mulbo-server"; # /var/lib/mulbo-server, owned by danny # Read-only access to navidrome.db (+WAL/SHM) — see UMask override
# on the navidrome service above.
SupplementaryGroups = [ "navidrome" ];
StateDirectory = "mulbo-server"; # /var/lib/mulbo-server, owned by danny
# Navidrome credentials — file format: KEY=value lines. # Navidrome credentials — file format: KEY=value lines.
# Required keys: MULBO_NAVIDROME_USER, MULBO_NAVIDROME_PASS. # Required keys: MULBO_NAVIDROME_USER, MULBO_NAVIDROME_PASS.
# Created manually on sunken-ship (mode 600, owned by danny): # Created manually on sunken-ship (mode 600, owned by danny):
# echo -e "MULBO_NAVIDROME_USER=DannyDannyDanny\nMULBO_NAVIDROME_PASS=..." > ~/.secrets/mulbo-server-navidrome # echo -e "MULBO_NAVIDROME_USER=DannyDannyDanny\nMULBO_NAVIDROME_PASS=..." > ~/.secrets/mulbo-server-navidrome
# chmod 600 ~/.secrets/mulbo-server-navidrome # chmod 600 ~/.secrets/mulbo-server-navidrome
EnvironmentFile = "/home/danny/.secrets/mulbo-server-navidrome"; EnvironmentFile = "/home/danny/.secrets/mulbo-server-navidrome";
}; };
}; };