dconf: split into own sane.programs definition

hosts/common/default.nix

@@ -120,21 +120,6 @@
     '';
   };
 
-  # dconf docs: <https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/desktop_migration_and_administration_guide/profiles>
-  # this lets programs temporarily write user-level dconf settings (aka gsettings).
-  # they're written to ~/.config/dconf/user, unless `DCONF_PROFILE` is set to something other than the default of /etc/dconf/profile/user
-  # find keys/values with `dconf dump /`
-  programs.dconf.enable = true;
-  programs.dconf.packages = [
-    (pkgs.writeTextFile {
-      name = "dconf-user-profile";
-      destination = "/etc/dconf/profile/user";
-      text = ''
-        user-db:user
-        system-db:site
-      '';
-    })
-  ];
   # sane.programs.glib.enableFor.user.colin = true;  # for `gsettings`
 
   # link debug symbols into /run/current-system/sw/lib/debug

hosts/common/programs/dconf.nix

@@ -0,0 +1,26 @@
+# dconf docs: <https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/desktop_migration_and_administration_guide/profiles>
+# this lets programs temporarily write user-level dconf settings (aka gsettings).
+# they're written to ~/.config/dconf/user, unless `DCONF_PROFILE` is set to something other than the default of /etc/dconf/profile/user
+# find keys/values with `dconf dump /`
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.sane.programs.dconf;
+in
+{
+  programs.dconf = lib.mkIf cfg.enabled {
+    # TODO: sandbox.
+    # note that `programs.dconf` doesn't allow specifying the dconf package.
+    enable = true;
+    packages = [
+      (pkgs.writeTextFile {
+        name = "dconf-user-profile";
+        destination = "/etc/dconf/profile/user";
+        text = ''
+          user-db:user
+          system-db:site
+        '';
+      })
+    ];
+  };
+}

hosts/common/programs/default.nix

@@ -17,6 +17,7 @@
     ./chatty.nix
     ./conky
     ./cozy.nix
+    ./dconf.nix
     ./dialect.nix
     ./dino.nix
     ./element-desktop.nix

hosts/modules/gui/default.nix

@@ -57,6 +57,7 @@ in
   sane.programs.guiBaseApps = declPackageSet [
     # "abaddon"  # discord client
     "alacritty"  # terminal emulator
+    "dconf"  # required by many packages, but not well-documented :(
     "delfin"  # Jellyfin client
     "dialect"  # language translation
     "dino"  # XMPP client