Ensure that nvidia graphics driver is mounted

Checks that /sys/module/nvidia/version has corresponding
/usr/lib/GL/nvidia-X-Y directory.

Issue: #342

Signed-off-by: Jiří Janoušek <[email protected]>

src/nuvolakit-runner/AppRunnerController.vala

@@ -264,6 +264,9 @@ public class AppRunnerController : RunnerApplication
 
 	private void init_gui()
 	{
+		#if FLATPAK
+		Graphics.ensure_gl_extension_mounted(main_window);
+		#endif
 		actions_helper = new ActionsHelper(actions, config);
 		unowned ActionsHelper ah = actions_helper;
 		Diorite.Action[] actions_spec = {

src/nuvolakit-runner/MasterController.vala

@@ -234,6 +234,10 @@ public class MasterController : Diorite.Application
 		if (init_state >= InitState.GUI)
 			return;
 
+		#if FLATPAK
+		Graphics.ensure_gl_extension_mounted(main_window);
+		#endif
+
 		Diorite.Action[] actions_spec = {
 		//          Action(group, scope, name, label?, mnemo_label?, icon?, keybinding?, callback?)
 		new Diorite.SimpleAction("main", "app", Actions.HELP, "Help", "_Help", null, "F1", do_help),

src/nuvolakit-runner/system/Graphics.vala

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2017 Jiří Janoušek <[email protected]>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met: 
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer. 
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution. 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace Nuvola.Graphics
+{
+
+#if FLATPAK
+public string? get_required_gl_extension()
+{
+	try
+	{
+		var nvidia_version = Diorite.System.read_file(File.new_for_path("/sys/module/nvidia/version")).strip();
+		if (nvidia_version != "")
+			return "nvidia-" + nvidia_version.replace(".", "-");
+	}
+	catch (GLib.Error e)
+	{
+		if (!(e is GLib.IOError.NOT_FOUND))
+			error("Unexpected error: %s", e.message);
+	}
+	return null;
+}
+
+public bool is_required_gl_extension_mounted()
+{
+	var gl_extension = get_required_gl_extension();
+	if (gl_extension == null)
+		return true;
+	else
+		return File.new_for_path("/usr/lib/GL").get_child(gl_extension).query_exists();
+}
+
+public void ensure_gl_extension_mounted(Gtk.Window? parent_window)
+{
+	if (!is_required_gl_extension_mounted())
+	{
+		var gl_extension = get_required_gl_extension();
+		var dialog = new Gtk.MessageDialog.with_markup(
+			parent_window, Gtk.DialogFlags.MODAL, Gtk.MessageType.ERROR, Gtk.ButtonsType.CLOSE,
+			("<b><big>Missing Graphics Driver</big></b>\n\n"
+			+ "Graphics driver '%s' for Flatpak has not been found on your system. "
+			+ "Please consult <a href=\"https://github.com/tiliado/nuvolaruntime/wiki/Graphics-Drivers\">documentation "
+			+ "on graphics drivers</a> to get help with installation."), gl_extension);
+		Timeout.add_seconds(120, () => { dialog.destroy(); return false;});
+		dialog.run();
+		error("GL extension not found: %s", gl_extension);
+	}
+}
+#endif
+
+} // namespace Nuvola.Graphics