feat: socket activated rsyncd, rsyncb sends message on failure

modules/programs/firefox.nix

@@ -99,7 +99,6 @@ lib.mkIf config.programs.firefox.enable {
         builtins.listToAttrs [
           (extension "ublock-origin" "uBlock0@raymondhill.net")
           (extension "firefox-translations" "firefox-translations-addon@mozilla.org")
-          (extension "private-relay" "private-relay@firefox.com")
           (extension "decentraleyes" "jid1-BoFifL9Vbdl2zQ@jetpack")
           (extension "keepassxc-browser" "keepassxc-browser@keepassxc.org")
         ];

options/server/rsync-daemon/default.nix

@@ -80,6 +80,7 @@ in
 
     modules.fixes.services.rsyncd = {
       enable = true;
+      socketActivated = true;
       settings = {
         globalSection = {
           inherit (cfg) port address;

options/services/rsync-backup/default.nix

@@ -135,6 +135,17 @@ in
           unitConfig = {
             Description = "Backs up files from a source location to a specified destination.";
           };
+
+          postStop = ''
+            if [ "$SERVICE_RESULT" != "success" ]; then
+                ${pkgs.curl}/bin/curl \
+                    -H "Priority: urgent" \
+                    -H "Title: Backup error" \
+                    -d "Backup '${cfg.unitName}-${slugify mod.target.location}' had unexpected behaviour: $SERVICE_RESULT" \
+                    https://ntfy.ccnlc.eu/rsync-backup
+            fi
+          '';
+
           serviceConfig = {
             Type = "simple";
             Restart = "on-failure";