[gnome-boxes] libvirt-system-importer: Don't needlessly chmod disk

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 4a3b15299dfffa63a02825d0e1cb4cdfa6302491
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Mon Feb 2 19:38:27 2015 +0000

    libvirt-system-importer: Don't needlessly chmod disk
    
    If disk image is already readable, there is no need to launch annoying
    policykit dialog.

 src/libvirt-system-importer.vala |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)
---
diff --git a/src/libvirt-system-importer.vala b/src/libvirt-system-importer.vala
index c8cb676..887e2d2 100644
--- a/src/libvirt-system-importer.vala
+++ b/src/libvirt-system-importer.vala
@@ -135,8 +135,21 @@ private class Boxes.LibvirtSystemImporter: GLib.Object {
         argv += "pkexec";
         argv += "chmod";
         argv += "a+r";
-        foreach (var disk_path in disk_paths)
-            argv += disk_path;
+
+        foreach (var disk_path in disk_paths) {
+            var file = File.new_for_path (disk_path);
+            var info = yield file.query_info_async (FileAttribute.ACCESS_CAN_READ,
+                                                    FileQueryInfoFlags.NONE,
+                                                    Priority.DEFAULT,
+                                                    null);
+            if (!info.get_attribute_boolean (FileAttribute.ACCESS_CAN_READ)) {
+                debug ("'%s' not readable, gotta make it readable..", disk_path);
+                argv += disk_path;
+            }
+        }
+
+        if (argv.length == 3)
+            return;
 
         debug ("Making all libvirt system disks readable..");
         yield exec (argv, null);