bitbake: hob: print message when DISPLAY is not set

If DISPLAY wasn't set, launching hob has printed a traceback
difficult to understand. Now, the exception is caught and it
shows a human message.

[YOCTO #2596]

(Bitbake rev: a41098a2dacbd903422ccdcd1885b0f351c7ddf3)

Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/bitbake/lib/bb/ui/crumbs/builder.py b/bitbake/lib/bb/ui/crumbs/builder.py
index 8405ade..833577f 100755 (executable)
--- a/bitbake/lib/bb/ui/crumbs/builder.py
+++ b/bitbake/lib/bb/ui/crumbs/builder.py
@@ -28,6 +28,7 @@ import subprocess
 import shlex
 import re
 import logging
+import sys
 from bb.ui.crumbs.template import TemplateMgr
 from bb.ui.crumbs.imageconfigurationpage import ImageConfigurationPage
 from bb.ui.crumbs.recipeselectionpage import RecipeSelectionPage
@@ -458,8 +459,14 @@ class Builder(gtk.Window):
         self.set_title("Hob")
         self.set_icon_name("applications-development")
         self.set_resizable(True)
-        window_width = self.get_screen().get_width()
-        window_height = self.get_screen().get_height()
+
+        try:
+            window_width = self.get_screen().get_width()
+            window_height = self.get_screen().get_height()
+        except AttributeError:
+            print "Please set DISPLAY variable before running Hob."
+            sys.exit(1)
+
         if window_width >= hwc.MAIN_WIN_WIDTH:
             window_width = hwc.MAIN_WIN_WIDTH
             window_height = hwc.MAIN_WIN_HEIGHT