Add the ability to pass use flags through cbuildbot to build_packages.

buildbot/cbuildbot_stages.py

Index: buildbot/cbuildbot_stages.py
diff --git a/buildbot/cbuildbot_stages.py b/buildbot/cbuildbot_stages.py
index 197a50bf0538cd024460df11592fb229698f92bc..6997755b1a64658cc770dea264eaaa452d0053b4 100644
--- a/buildbot/cbuildbot_stages.py
+++ b/buildbot/cbuildbot_stages.py
@@ -319,10 +319,18 @@ class BuildTargetStage(BuilderStage):
     BuilderStage.new_binhost = self._GetPortageEnvVar(_FULL_BINHOST)
     emptytree = (BuilderStage.old_binhost and
                  BuilderStage.old_binhost != BuilderStage.new_binhost)
-
+    env=[]
+    if self._build_config['useflags']:
+      if isinstance(self._build_config['useflags'], basestring):

[sosa, 2011/04/01 00:01:11]

Choose one or the other ...i.e. allow string or array, don't allow both.

[Peter Mayo, 2011/04/01 02:46:05]

I think array may eventually be required, but since a string can be used as an
array, if you pass a string you end up with a  d o u b l e  s p a c e d 
version.

Done

+        env.append('USE=%s' % self._build_config['useflags'])
+      else:
+        env.append('USE="%s"' % ' '.join(self._build_config['useflags']))
+
+    # TODO(petermayo): Add other extra env variable when asked.

[sosa, 2011/04/01 00:01:11]

Remove this TODO

[Peter Mayo, 2011/04/01 02:46:05]

Done.

     commands.Build(
         self._build_root, emptytree, usepkg=self._build_config['usepkg'],
-        build_autotest=(self._build_config['vm_tests'] and self._options.tests))
+        build_autotest=(self._build_config['vm_tests'] and self._options.tests),
+        extra_env=env)
 
     # TODO(sosa):  Do this optimization in a better way.
     if self._build_type == 'full':