cosmic-greeter: add cosmic-randr to PATH; nixos/cosmic-greeter: install cosmic-comp by default (#448844)

nixos/modules/services/display-managers/cosmic-greeter.nix

@@ -24,6 +24,11 @@ in
   };
 
   config = lib.mkIf cfg.enable {
+    environment.systemPackages = [
+      pkgs.cosmic-comp
+      cfg.package
+    ];
+
     services.greetd = {
       enable = true;
       settings = {
@@ -50,14 +55,22 @@ in
       };
     };
 
+    systemd.tmpfiles.settings.cosmic-greeter."/run/cosmic-greeter".d = {
+      group = "cosmic-greeter";
+      mode = "0755";
+      user = "cosmic-greeter";
+    };
+
     # The greeter user is hardcoded in `cosmic-greeter`
     users.groups.cosmic-greeter = { };
     users.users.cosmic-greeter = {
       description = "COSMIC login greeter user";
       isSystemUser = true;
       home = "/var/lib/cosmic-greeter";
+      homeMode = "0750";
       createHome = true;
       group = "cosmic-greeter";
+      extraGroups = [ "video" ];
     };
     # Required for authentication
     security.pam.services.cosmic-greeter = { };

pkgs/by-name/co/cosmic-greeter/package.nix

@@ -14,6 +14,7 @@
   xkeyboard_config,
   nix-update-script,
   nixosTests,
+  orca,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -47,6 +48,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
     libinput
     linux-pam
     udev
+    orca
   ];
 
   dontUseJustBuild = true;
@@ -63,10 +65,12 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   postPatch = ''
     substituteInPlace src/greeter.rs --replace-fail '/usr/bin/env' '${lib.getExe' coreutils "env"}'
+    substituteInPlace src/greeter.rs --replace-fail '/usr/bin/orca' '${lib.getExe orca}'
   '';
 
   preFixup = ''
     libcosmicAppWrapperArgs+=(
+      --prefix PATH : ${lib.makeBinPath [ cosmic-randr ]}
       --set-default X11_BASE_RULES_XML ${xkeyboard_config}/share/X11/xkb/rules/base.xml
       --set-default X11_BASE_EXTRA_RULES_XML ${xkeyboard_config}/share/X11/xkb/rules/extra.xml
     )