gnome-terminal: add assertion on profile names

modules/programs/gnome-terminal.nix

@@ -292,12 +292,30 @@ in {
       profile = mkOption {
         default = { };
         type = types.attrsOf profileSubModule;
-        description = "A set of Gnome Terminal profiles.";
+        description = ''
+          A set of Gnome Terminal profiles. Note, the name of a profile must be
+          a UUID. You can generate one, for example, using {command}`uuidgen`
+          (from `util-linux`).
+        '';
       };
     };
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (let
+        uuidre =
+          "[[:xdigit:]]{8}-[[:xdigit:]]{4}-[[:xdigit:]]{4}-[[:xdigit:]]{4}-[[:xdigit:]]{12}";
+        erroneous =
+          filter (n: builtins.match uuidre n == null) (attrNames cfg.profile);
+      in {
+        assertion = erroneous == [ ];
+        message = ''
+          The attribute name of a Gnome Terminal profile must be a UUID.
+          Incorrect profile names: ${concatStringsSep ", " erroneous}'';
+      })
+    ];
+
     home.packages = [ pkgs.gnome.gnome-terminal ];
 
     dconf.settings = let dconfPath = "org/gnome/terminal/legacy";

tests/modules/programs/gnome-terminal/bad-profile-name.nix

@@ -0,0 +1,25 @@
+{ config, ... }:
+
+{
+  programs.gnome-terminal = {
+    enable = true;
+    profile = {
+      bad-name = { visibleName = "a"; };
+      "e0b782ed-6aca-44eb-8c75-62b3706b6220" = {
+        default = true;
+        visibleName = "b";
+      };
+      another-bad-name = { visibleName = "c"; };
+    };
+  };
+
+  nixpkgs.overlays = [
+    (self: super: { gnome.gnome-terminal = config.lib.test.mkStubPackage { }; })
+  ];
+
+  test.stubs.dconf = { };
+
+  test.asserts.assertions.expected = [''
+    The attribute name of a Gnome Terminal profile must be a UUID.
+    Incorrect profile names: another-bad-name, bad-name''];
+}

tests/modules/programs/gnome-terminal/default.nix

@@ -1 +1,4 @@
-{ gnome-terminal-1 = ./gnome-terminal-1.nix; }
+{
+  gnome-terminal-1 = ./gnome-terminal-1.nix;
+  gnome-terminal-bad-profile-name = ./bad-profile-name.nix;
+}