Add a daily dump of the Library database

library-dump.timer writes Library-<weekday>.sql.gz to
~/.local/share/library_manager/dumps, which simple_backup then copies;
the login comes from ~/.config/library_manager/dump.cnf (not tracked).

.config/systemd/user/library-dump.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Dump the Library database to ~/.local/share/library_manager/dumps
+StartLimitIntervalSec=2h
+StartLimitBurst=4
+
+[Service]
+Type=oneshot
+ExecStart=%h/.local/bin/library-dump
+# MariaDB not up yet (e.g. caught up right after boot)? retry a few times
+Restart=on-failure
+RestartSec=5min

.config/systemd/user/library-dump.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Dump the Library database daily
+
+[Timer]
+OnCalendar=daily
+Persistent=true
+
+[Install]
+WantedBy=timers.target

.github/README.md

@@ -17,7 +17,7 @@ install script. This README lives in `.github/` to keep it out of the home direc
 | Audio / media | mpd, ncmpcpp, mpDris2, mpv, beets, pipewire |
 | Packaging | `.config/aurutils-makepkg.conf`, `.config/aurb/`, `.local/bin/aurb` / `aurs` (aurutils wrappers) |
 | Services | `.config/systemd/user/` (timers and overrides) |
-| Scripts | `.local/bin/` (screen layout, phone mount, video helpers) |
+| Scripts | `.local/bin/` (screen layout, phone mount, video helpers, Library database dump) |
 
 Note: `config.fish` sources `~/.bash_aliases`, so the aliases apply in both shells.
 

.local/bin/library-dump

@@ -0,0 +1,17 @@
+#!/bin/bash
+# Dump the Library database to a per-weekday file (seven self-rotating copies).
+set -euo pipefail
+
+cnf=${XDG_CONFIG_HOME:-$HOME/.config}/library_manager/dump.cnf
+dir=${XDG_DATA_HOME:-$HOME/.local/share}/library_manager/dumps
+out=$dir/Library-$(LC_ALL=C date +%a).sql.gz
+
+umask 077
+mkdir -p "$dir"
+
+# Write to a temporary file so a failed dump never replaces a good one
+tmp=$(mktemp "$dir/.dump.XXXXXX")
+trap 'rm -f "$tmp"' EXIT
+
+mariadb-dump --defaults-extra-file="$cnf" --single-transaction --databases Library | gzip > "$tmp"
+mv "$tmp" "$out"