Remove Some Static IDs (#367563)

ci/OWNERS

···
 /nixos/default.nix                                    @infinisil
 /nixos/lib/from-env.nix                               @infinisil
 /nixos/lib/eval-config.nix                            @infinisil
+/nixos/modules/misc/ids.nix                           @R-VdP
 /nixos/modules/system/activation/bootspec.nix         @grahamc @cole-h @raitobezarius
 /nixos/modules/system/activation/bootspec.cue         @grahamc @cole-h @raitobezarius
 

nixos/modules/hardware/uinput.nix

···
   config = lib.mkIf cfg.enable {
     boot.kernelModules = [ "uinput" ];
 
-    users.groups.uinput.gid = config.ids.gids.uinput;
+    users.groups.uinput = { };
 
     services.udev.extraRules = ''
       SUBSYSTEM=="misc", KERNEL=="uinput", MODE="0660", GROUP="uinput", OPTIONS+="static_node=uinput"

nixos/modules/misc/ids.nix

···
 # central list to prevent id collisions.
 
 # IMPORTANT!
-# We only add static uids and gids for services where it is not feasible
-# to change uids/gids on service start, for example a service with a lot of
-# files. Please also check if the service is applicable for systemd's
-# DynamicUser option and does not need a uid/gid allocation at all.
-# Systemd can also change ownership of service directories using the
-# RuntimeDirectory/StateDirectory options.
+#
+# https://github.com/NixOS/rfcs/blob/master/rfcs/0052-dynamic-ids.md
+#
+# Use of static ids is deprecated within NixOS. Dynamic allocation is
+# required, barring special circumstacnes. Please check if the service
+# is applicable for systemd's DynamicUser option and does not need a
+# uid/gid allocation at all.  Systemd can also change ownership of
+# service directories using the RuntimeDirectory/StateDirectory
+# options.
 
 { lib, ... }:
 
···
       rstudio-server = 324;
       localtimed = 325;
       automatic-timezoned = 326;
-      whisparr = 328;
 
       # When adding a uid, make sure it doesn't match an existing gid.
       #
···
       rstudio-server = 324;
       localtimed = 325;
       automatic-timezoned = 326;
-      uinput = 327;
-      whisparr = 328;
 
       # When adding a gid, make sure it doesn't match an existing
       # uid. Users and groups with the same name should have equal

nixos/modules/services/misc/whisparr.nix

···
       whisparr = {
         group = cfg.group;
         home = cfg.dataDir;
-        uid = config.ids.uids.whisparr;
+        isSystemUser = true;
       };
     };
 
-    users.groups = lib.mkIf (cfg.group == "whisparr") { whisparr.gid = config.ids.gids.whisparr; };
+    users.groups.whisparr = lib.mkIf (cfg.group == "whisparr") { };
   };
 }