Merge lp:~cypressyew/checkbox/fix-xorg-version into lp:checkbox

[Po-Hsu Lin]

Make xorg-version job fail correctly.

[Sylvain Pineau (sylvain-pineau)]

+1, thanks for the fix. Tested on a system without X, it works as expected

review: Approve

=== modified file 'providers/plainbox-provider-checkbox/jobs/graphics.txt.in'
--- providers/plainbox-provider-checkbox/jobs/graphics.txt.in	2016-01-21 09:03:50 +0000
+++ providers/plainbox-provider-checkbox/jobs/graphics.txt.in	2016-04-15 03:43:58 +0000
@@ -12,7 +12,7 @@
 category_id: 2013.com.canonical.plainbox::graphics
 id: graphics/xorg-version
 requires: package.name == "x11-utils"
-command: xdpyinfo | grep "^X.Org version" | cut -d ':' -f 2 | tr -d ' '
+command: set -o pipefail; xdpyinfo | grep "^X.Org version" | cut -d ':' -f 2 | tr -d ' '
 estimated_duration: 0.018
 _description: Test to output the Xorg version
 _summary: Test Xorg version