psd: add missing module config options

modules/services/psd.nix

@@ -4,6 +4,14 @@ let
 
   cfg = config.services.psd;
 
+  configFile = ''
+    ${lib.optionalString (cfg.browsers != [ ]) ''
+      BROWSERS=(${lib.concatStringsSep " " cfg.browsers})
+    ''}
+
+    USE_BACKUP="${if cfg.useBackup then "yes" else "no"}"
+    BACKUP_LIMIT=${builtins.toString cfg.backupLimit}
+  '';
 in {
   meta.maintainers = [ lib.hm.maintainers.danjujan ];
 
@@ -22,6 +30,34 @@ in {
         defaults to seconds if omitted.
       '';
     };
+
+    browsers = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      example = [ "chromium" "firefox" ];
+      description = ''
+        A list of browsers to sync. An empty list will enable all browsers to be managed by profile-sync-daemon.
+
+        Available choices are:
+        chromium chromium-dev conkeror.mozdev.org epiphany falkon firefox firefox-trunk google-chrome google-chrome-beta google-chrome-unstable heftig-aurora icecat inox luakit midori opera opera-beta opera-developer opera-legacy otter-browser qupzilla qutebrowser palemoon rekonq seamonkey surf vivaldi vivaldi-snapshot
+      '';
+    };
+
+    useBackup = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = ''
+        Whether to completly enable or disable the crash recovery feature.
+      '';
+    };
+
+    backupLimit = lib.mkOption {
+      type = lib.types.ints.unsigned;
+      default = 5;
+      description = ''
+        Maximum number of crash recovery snapshots to keep (the oldest ones are deleted first).
+      '';
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -38,6 +74,10 @@ in {
           rsync
           kmod
           gawk
+          gnugrep
+          gnused
+          coreutils
+          findutils
           nettools
           util-linux
           profile-sync-daemon
@@ -84,5 +124,7 @@ in {
         Timer = { OnUnitActiveSec = cfg.resyncTimer; };
       };
     };
+
+    xdg.configFile."psd/psd.conf".text = configFile;
   };
 }