freedesktop modules: init

nixos/modules/config/system-path.nix

@@ -81,6 +81,12 @@ in
         description = "List of additional package outputs to be symlinked into <filename>/run/current-system/sw</filename>.";
       };
 
+      extraSetup = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Shell fragments to be run after the system environment has been created. This should only be used for things that need to modify the internals of the environment, e.g. generating MIME caches. The environment being built can be accessed at $out.";
+      };
+
     };
 
     system = {
@@ -107,12 +113,7 @@ in
         "/etc/gtk-3.0"
         "/lib" # FIXME: remove and update debug-info.nix
         "/sbin"
-        "/share/applications"
-        "/share/desktop-directories"
         "/share/emacs"
-        "/share/icons"
-        "/share/menus"
-        "/share/mime"
         "/share/nano"
         "/share/org"
         "/share/themes"
@@ -132,28 +133,15 @@ in
       # outputs TODO: note that the tools will often not be linked by default
       postBuild =
         ''
-          if [ -x $out/bin/update-mime-database -a -w $out/share/mime ]; then
-              XDG_DATA_DIRS=$out/share $out/bin/update-mime-database -V $out/share/mime > /dev/null
-          fi
-
           if [ -x $out/bin/gtk-update-icon-cache -a -f $out/share/icons/hicolor/index.theme ]; then
               $out/bin/gtk-update-icon-cache $out/share/icons/hicolor
           fi
 
           if [ -x $out/bin/glib-compile-schemas -a -w $out/share/glib-2.0/schemas ]; then
               $out/bin/glib-compile-schemas $out/share/glib-2.0/schemas
           fi
-
-          if [ -x $out/bin/update-desktop-database -a -w $out/share/applications ]; then
-              $out/bin/update-desktop-database $out/share/applications
-          fi
-
-          if [ -x $out/bin/install-info -a -w $out/share/info ]; then
-            shopt -s nullglob
-            for i in $out/share/info/*.info $out/share/info/*.info.gz; do
-                $out/bin/install-info $i $out/share/info/dir
-            done
-          fi
+
+          ${config.environment.extraSetup}
         '';
     };
 

nixos/modules/config/xdg/autostart.nix

@@ -0,0 +1,22 @@
+{ config, lib, ... }:
+
+with lib;
+{
+  options = {
+    xdg.autostart.enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to install files to support the 
+        <link xlink:href="https://specifications.freedesktop.org/autostart-spec/autostart-spec-latest.html">XDG Autostart specification</link>.
+      '';
+    };
+  };
+
+  config = mkIf config.xdg.autostart.enable {
+    environment.pathsToLink = [ 
+      "/etc/xdg/autostart"
+    ];
+  };
+
+}

nixos/modules/config/xdg/icons.nix

@@ -0,0 +1,27 @@
+{ config, lib, ... }:
+
+with lib;
+{
+  options = {
+    xdg.icons.enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to install files to support the 
+        <link xlink:href="https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html">XDG Icon Theme specification</link>.
+      '';
+    };
+  };
+
+  config = mkIf config.xdg.icons.enable {
+    environment.pathsToLink = [ 
+      "/share/icons" 
+      "/share/pixmaps" 
+    ];
+
+    environment.profileRelativeEnvVars = {
+      XCURSOR_PATH = [ "/share/icons" ];
+    };
+  };
+
+}

nixos/modules/config/xdg/menus.nix

@@ -0,0 +1,25 @@
+{ config, lib, ... }:
+
+with lib;
+{
+  options = {
+    xdg.menus.enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to install files to support the 
+        <link xlink:href="https://specifications.freedesktop.org/menu-spec/menu-spec-latest.html">XDG Desktop Menu specification</link>.
+      '';
+    };
+  };
+
+  config = mkIf config.xdg.menus.enable {
+    environment.pathsToLink = [ 
+      "/share/applications"
+      "/share/desktop-directories"
+      "/etc/xdg/menus"
+      "/etc/xdg/menus/applications-merged"
+    ];
+  };
+
+}

nixos/modules/config/xdg/mime.nix

@@ -0,0 +1,36 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+{
+  options = {
+    xdg.mime.enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to install files to support the 
+        <link xlink:href="https://specifications.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html">XDG Shared MIME-info specification</link> and the
+        <link xlink:href="https://specifications.freedesktop.org/mime-apps-spec/mime-apps-spec-latest.html">XDG MIME Applications specification</link>.
+      '';
+    };
+  };
+
+  config = mkIf config.xdg.mime.enable {
+    environment.pathsToLink = [ "/share/mime" ];
+
+    environment.systemPackages = [ 
+      # this package also installs some useful data, as well as its utilities 
+      pkgs.shared-mime-info 
+    ];
+
+    environment.extraSetup = ''
+      if [ -w $out/share/mime ]; then
+        XDG_DATA_DIRS=$out/share ${pkgs.shared-mime-info}/bin/update-mime-database -V $out/share/mime > /dev/null
+      fi
+
+      if [ -w $out/share/applications ]; then
+        ${pkgs.desktop-file-utils}/bin/update-desktop-database $out/share/applications
+      fi
+    '';
+  };
+
+}

nixos/modules/misc/documentation.nix

@@ -82,6 +82,14 @@ let cfg = config.documentation; in
       environment.systemPackages = [ pkgs.texinfoInteractive ];
       environment.pathsToLink = [ "/share/info" ];
       environment.extraOutputsToInstall = [ "info" ] ++ optional cfg.dev.enable "devinfo";
+      environment.extraSetup = ''
+        if [ -w $out/share/info ]; then
+          shopt -s nullglob
+          for i in $out/share/info/*.info $out/share/info/*.info.gz; do
+              ${pkgs.texinfo}/bin/install-info $i $out/share/info/dir
+          done
+        fi
+      '';
     })
 
     (mkIf cfg.doc.enable {

nixos/modules/module-list.nix

@@ -7,6 +7,10 @@
   ./config/fonts/fontdir.nix
   ./config/fonts/fonts.nix
   ./config/fonts/ghostscript.nix
+  ./config/xdg/autostart.nix
+  ./config/xdg/icons.nix
+  ./config/xdg/menus.nix
+  ./config/xdg/mime.nix
   ./config/gnu.nix
   ./config/i18n.nix
   ./config/iproute2.nix

nixos/modules/programs/environment.nix

@@ -40,7 +40,6 @@ in
         GTK_PATH = [ "/lib/gtk-2.0" "/lib/gtk-3.0" ];
         XDG_CONFIG_DIRS = [ "/etc/xdg" ];
         XDG_DATA_DIRS = [ "/share" ];
-        XCURSOR_PATH = [ "/share/icons" ];
         MOZ_PLUGIN_PATH = [ "/lib/mozilla/plugins" ];
         LIBEXEC_PATH = [ "/lib/libexec" ];
       };

nixos/modules/services/networking/xrdp.nix

@@ -93,10 +93,14 @@ in
 
   config = mkIf cfg.enable {
 
-    # copied from <nixos/modules/services/x11/xserver.nix>
     # xrdp can run X11 program even if "services.xserver.enable = false"
-    environment.pathsToLink =
-      [ "/etc/xdg" "/share/xdg" "/share/applications" "/share/icons" "/share/pixmaps" ];
+    xdg = {
+      autostart.enable = true;
+      menus.enable = true;
+      mime.enable = true;
+      icons.enable = true;
+    };
+
     fonts.enableDefaultFonts = mkDefault true;
 
     systemd = {

nixos/modules/services/x11/desktop-managers/enlightenment.nix

@@ -33,12 +33,17 @@ in
       pkgs.xorg.xauth # used by kdesu
       pkgs.gtk2 # To get GTK+'s themes.
       pkgs.tango-icon-theme
-      pkgs.shared-mime-info
+
       pkgs.gnome2.gnomeicontheme
       pkgs.xorg.xcursorthemes
     ];
 
-    environment.pathsToLink = [ "/etc/enlightenment" "/etc/xdg" "/share/enlightenment" "/share/elementary" "/share/applications" "/share/locale" "/share/icons" "/share/themes" "/share/mime" "/share/desktop-directories" ];
+    environment.pathsToLink = [ 
+      "/etc/enlightenment" 
+      "/share/enlightenment" 
+      "/share/elementary" 
+      "/share/locale"
+    ];
 
     services.xserver.desktopManager.session = [
     { name = "Enlightenment";

nixos/modules/services/x11/desktop-managers/lumina.nix

@@ -41,9 +41,8 @@ in
 
     # Link some extra directories in /run/current-system/software/share
     environment.pathsToLink = [
-      "/share/desktop-directories"
-      "/share/icons"
       "/share/lumina"
+      # FIXME: modules should link subdirs of `/share` rather than relying on this
       "/share"
     ];
 

nixos/modules/services/x11/desktop-managers/plasma5.nix

@@ -174,7 +174,10 @@ in
         ++ lib.optional config.services.colord.enable colord-kde
         ++ lib.optionals config.services.samba.enable [ kdenetwork-filesharing pkgs.samba ];
 
-      environment.pathsToLink = [ "/share" ];
+      environment.pathsToLink = [ 
+        # FIXME: modules should link subdirs of `/share` rather than relying on this
+        "/share" 
+      ];
 
       environment.etc = singleton {
         source = xcfg.xkbDir;

nixos/modules/services/x11/desktop-managers/xfce.nix

@@ -59,9 +59,6 @@ in
       tango-icon-theme
       xfce4-icon-theme
 
-      desktop-file-utils
-      shared-mime-info
-
       # Needed by Xfce's xinitrc script
       # TODO: replace with command -v
       which
@@ -100,8 +97,6 @@ in
     environment.pathsToLink = [
       "/share/xfce4"
       "/share/themes"
-      "/share/mime"
-      "/share/desktop-directories"
       "/share/gtksourceview-2.0"
     ];
 

nixos/modules/services/x11/xserver.nix

@@ -616,8 +616,12 @@ in
       ]
       ++ optional (elem "virtualbox" cfg.videoDrivers) xorg.xrefresh;
 
-    environment.pathsToLink =
-      [ "/etc/xdg" "/share/xdg" "/share/applications" "/share/icons" "/share/pixmaps" ];
+    xdg = { 
+      autostart.enable = true;
+      menus.enable = true;
+      mime.enable = true;
+      icons.enable = true;
+    };
 
     # The default max inotify watches is 8192.
     # Nowadays most apps require a good number of inotify watches,