Getting rid of the var indirection and using a bin path instead

nixos/modules/services/scheduling/atd.nix

@@ -42,13 +42,13 @@ in
 
   config = mkIf cfg.enable {
 
-    security.wrappers.setuid = map (program: "${program}" = {
+    security.wrappers = map (program: {"${program}" = {
       source = "${pkgs.atd}/bin/${program}";
       owner = "atd";
       group = "atd";
       setuid = true;
       setgid = true;
-    }) [ "at" "atq" "atrm" "batch" ];
+    };}) [ "at" "atq" "atrm" "batch" ];
 
     environment.systemPackages = [ at ];
 

nixos/modules/services/scheduling/cron.nix

@@ -20,7 +20,7 @@ let
   cronNixosPkg = pkgs.cron.override {
     # The mail.nix nixos module, if there is any local mail system enabled,
     # should have sendmail in this path.
-    sendmailPath = "/run/wrappers/sendmail";
+    sendmailPath = "/run/wrappers/bin/sendmail";
   };
 
   allFiles =

nixos/modules/services/scheduling/fcron.nix

@@ -96,7 +96,7 @@ in
             fcronallow  =       /etc/fcron.allow
             fcrondeny   =       /etc/fcron.deny
             shell       =       /bin/sh
-            sendmail    =       /run/wrappers/sendmail
+            sendmail    =       /run/wrappers/bin/sendmail
             editor      =       /run/current-system/sw/bin/vi
           '';
           target = "fcron.conf";