Add a module to backup servers with MariaDB

modules/restic-server-mysql-client/default.nix

@@ -0,0 +1,49 @@
+{ config, inputs, custom, pkgs, time, ... }:
+{
+  systemd.timers."restic-backups-${custom.username}" = {
+    wantedBy = [ "timers.target" ];
+    partOf = [ "restic-backups-${custom.username}.service" ];
+    timerConfig = {
+      OnCalendar = time;
+    };
+  };
+
+  systemd.services."restic-backups-${custom.username}" = {
+    serviceConfig = {
+      User = "root";
+      Type = "oneshot";
+    };
+    environment = {
+      RESTIC_PASSWORD_FILE = "/home/${custom.username}/.nixos/secrets/passwords/restic.key";
+      RESTIC_REPOSITORY = "rest:http://10.7.89.30:8000";
+    };
+    script = ''
+      ${pkgs.restic}/bin/restic backup \
+        --exclude-file=${inputs.self}/modules/restic/excludes.txt \
+        --tag home-dir \
+        /home/${custom.username}
+
+      ${pkgs.mariadb}/bin/mysqldump --all-databases | \
+      ${pkgs.restic}/bin/restic backup \
+        --tag mariadb \
+        --stdin \
+        --stdin-filename all_databases.sql
+
+      ${pkgs.restic}/bin/restic forget \
+        --tag home-dir \
+        --host ${config.networking.hostName} \
+        --keep-daily 7 \
+        --keep-weekly 5 \
+        --keep-monthly 12 \
+        --keep-yearly 75
+
+      ${pkgs.restic}/bin/restic forget \
+        --tag mariadb \
+        --host ${config.networking.hostName} \
+        --keep-daily 7 \
+        --keep-weekly 5 \
+        --keep-monthly 12 \
+        --keep-yearly 75
+    '';
+  };
+}