backup nextcloud and hedgedoc database using borgmatic

expose database passwords using agenix
install lsof and parted

nixos/modules/backups.nix

@@ -23,6 +23,17 @@ let
       unknown_unencrypted_repo_access_is_ok: true
       before_everything:
       - ${beforeEverything}/bin/beforeEverything
+      postgresql_databases:
+      - name: nextcloud
+        hostname: lewis.dmz
+        username: nextcloud
+        password: ''${NEXTCLOUD_DATABASE_PASSWORD}
+        format: tar
+      - name: hedgedoc
+        hostname: lewis.dmz
+        username: hedgedoc
+        password: ''${HEDGEDOC_DATABASE_PASSWORD}
+        format: tar
     '';
   };
 in
@@ -63,17 +74,16 @@ in
   };
 
   config = lib.mkIf cfg.enable {
-    environment.systemPackages = with pkgs; [ borgbackup ];
+    environment.systemPackages = with pkgs; [ borgbackup postgresql ];
     # Converted from:
     # https://github.com/borgmatic-collective/borgmatic/tree/84823dfb912db650936e3492f6ead7e0e0d32a0f/sample/systemd
     systemd.services.borgmatic = {
       description = "borgmatic backup";
       wants = [ "network-online.target" ];
       after = [ "network-online.target" ];
-
-      unitConfig = {
-        ConditionACPower = true;
-      };
+      unitConfig.ConditionACPower = true;
+      preStart = "${pkgs.coreutils}/bin/sleep 10s";
+      path = with pkgs; [ postgresql ];
 
       serviceConfig = {
         Type = "oneshot";
@@ -84,9 +94,9 @@ in
         IOWeight = 100;
         Restart = "no";
         LogRateLimitIntervalSec = 0;
+        EnvironmentFile = config.age.secrets."database_passwords.env".path;
       };
 
-      preStart = "${pkgs.coreutils}/bin/sleep 1m";
       script = "${pkgs.systemd}/bin/systemd-inhibit --who=\"borgmatic\" --what=\"sleep:shutdown\" --why=\"Prevent interrupting scheduled backup\" ${pkgs.borgmatic}/bin/borgmatic --verbosity -2 --syslog-verbosity 1 -c ${borgmaticConfig}";
     };
 
@@ -99,5 +109,9 @@ in
         RandomizedDelaySec = "3h";
       };
     };
+
+    age.secrets."database_passwords.env" = {
+      file = ../secrets/database_passwords.env.age;
+    };
   };
 }

nixos/modules/data-sharing.nix

@@ -71,8 +71,8 @@ in
         dataDir = cfg.postgresDir;
 
         authentication = ''
-          host	nextcloud	nextcloud	all	md5
-          host	hedgedoc	hedgedoc	all	md5
+          host	nextcloud	nextcloud	all	      md5
+          host	hedgedoc	hedgedoc	all	      md5
         '';
       };
     };