screen-locker: Add option to configure x screensaver cycle (#2853)

Some screen lockers which will be used with xss-lock might require
to set x screensaver timeout with cycle.

.github/CODEOWNERS

@@ -378,8 +378,8 @@
 /modules/services/redshift-gammastep                  @rycee @petabyteboy @thiagokokada
 /tests/modules/redshift-gammastep                     @thiagokokada
 
-/modules/services/screen-locker.nix                   @jrobsonchase
-/tests/modules/services/screen-locker                 @jrobsonchase
+/modules/services/screen-locker.nix                   @jrobsonchase @rszamszur
+/tests/modules/services/screen-locker                 @jrobsonchase @rszamszur
 
 /modules/services/status-notifier-watcher.nix         @pltanton
 

modules/lib/maintainers.nix

@@ -247,4 +247,10 @@
     github = "sebtm";
     githubId = 17243347;
   };
+  rszamszur = {
+    name = "Radosław Szamszur";
+    email = "radoslawszamszur@gmail.com";
+    github = "rszamszur";
+    githubId = 10353018;
+  };
 }

modules/services/screen-locker.nix

@@ -94,6 +94,16 @@ in {
           Extra command-line arguments to pass to <command>xss-lock</command>.
         '';
       };
+
+      screensaverCycle = mkOption {
+        type = types.int;
+        default = 600;
+        description = ''
+          X server's screensaver cycle value expresed as seconds.
+          This will be used with <command>xset</command> to configure
+          the cycle along with timeout.
+        '';
+      };
     };
   };
 
@@ -122,7 +132,9 @@ in {
     }
     (mkIf (!cfg.xautolock.enable) {
       systemd.user.services.xss-lock.Service.ExecStartPre =
-        "${pkgs.xorg.xset}/bin/xset s ${toString (cfg.inactiveInterval * 60)}";
+        "${pkgs.xorg.xset}/bin/xset s ${toString (cfg.inactiveInterval * 60)} ${
+          toString cfg.xss-lock.screensaverCycle
+        }";
     })
     (mkIf cfg.xautolock.enable {
       systemd.user.services.xautolock-session = {

tests/modules/services/screen-locker/no-xautolock.nix

@@ -6,7 +6,10 @@
       enable = true;
       inactiveInterval = 5;
       lockCmd = "${pkgs.i3lock}/bin/i3lock -n -c AA0000";
-      xss-lock = { extraOptions = [ "-test" ]; };
+      xss-lock = {
+        extraOptions = [ "-test" ];
+        screensaverCycle = 5;
+      };
       xautolock = { enable = false; };
     };
 
@@ -18,7 +21,7 @@
 
       assertFileExists $xssService
       assertFileRegex $xssService 'ExecStart=.*/bin/xss-lock.*-test.*i3lock -n -c AA0000'
-      assertFileRegex $xssService 'ExecStartPre=.*/xset s 300'
+      assertFileRegex $xssService 'ExecStartPre=.*/xset s 300 5'
     '';
   };
 }