[gnome-boxes] unattended-installer: Be less strict about driver arch

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 11cfd62c0552aed8af6d109c58bfabb495fa9bfb
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Wed Jan 16 19:48:51 2013 +0200

    unattended-installer: Be less strict about driver arch
    
    This fixes the issue of "i386" drivers not being picked for "i686" OS.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=692246

 src/unattended-installer.vala |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/unattended-installer.vala b/src/unattended-installer.vala
index 4c556b2..6ec1fb6 100644
--- a/src/unattended-installer.vala
+++ b/src/unattended-installer.vala
@@ -666,7 +666,13 @@ private class Boxes.UnattendedInstaller: InstallerMedia {
         foreach (var d in os.get_device_drivers ().get_elements ()) {
             var driver = d as DeviceDriver;
 
-            if (driver.get_architecture () == os_media.architecture && driver.get_pre_installable ())
+            if (!driver.get_pre_installable ())
+                continue;
+
+            var compatibility = compare_cpu_architectures (os_media.architecture, driver.get_architecture ());
+            if (compatibility == CPUArchCompatibity.IDENTICAL || compatibility == CPUArchCompatibity.COMPATIBLE)
+                // We don't entertain compatiblity when word-size is different because 32-bit drivers
+                // are not guaranteed to work on 64-bit architectures in all OSs.
                 drivers.append (driver);
         }