[gnome-boxes] Handle stale file references from tracker

[Alexander Larsson <alexl src gnome org>]

commit 685894c563c977ceab2851f84dacae64afad2e6f
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Nov 27 10:45:54 2012 +0100

    Handle stale file references from tracker
    
    Tracker may give us old data, like if a file was moved/deleted and
    not yet rescanned. Currently this makes us give some hard to understand
    error when selecting the iso where the file doesn't exist. We now
    ensure the file is availible, so such files will not be listed in
    the new box wizard.

 src/media-manager.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/media-manager.vala b/src/media-manager.vala
index 536d198..bc4d67a 100644
--- a/src/media-manager.vala
+++ b/src/media-manager.vala
@@ -133,6 +133,9 @@ private class Boxes.MediaManager : Object {
                                                                        string? label,
                                                                        string? os_id,
                                                                        string? media_id) throws GLib.Error {
+        if (!FileUtils.test (path, FileTest.EXISTS))
+            throw new Boxes.Error.INVALID (_("No such file %s").printf (path));
+
         if (label == null || os_id == null || media_id == null)
             return yield create_installer_media_for_path (path, null);