Share gluster package namespace

Problem:
If both gluster-swift and libgfapi-python are installed on the same
system, only one could be imported at a time.

>>> from gluster import swift
>>> from gluster import gfapi
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: cannot import name gfapi

Fix:
Allow sharing of 'gluster' namespace among Python packages that use
them. This was discussed and implemented for libgfapi-python project
(http://review.gluster.org/#/c/9668/) but hadn't been done so far for
other Python projects that use 'gluster' namespace. This change does it
for gluster-swift.

Refer:
https://docs.python.org/2.7/library/pkgutil.html#pkgutil.extend_path
https://stackoverflow.com/questions/1675734

Change-Id: Ic6de294325a065d606604179a7ab84721dd401e0
Signed-off-by: Prashanth Pai <ppai@redhat.com>
Reviewed-on: http://review.gluster.org/14855
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Thiago da Silva <thiago@redhat.com>
Tested-by: Thiago da Silva <thiago@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/gluster/__init__.py b/gluster/__init__.py
index e69de29..e26f727 100644
--- a/gluster/__init__.py
+++ b/gluster/__init__.py
@@ -0,0 +1,18 @@
+# Copyright (c) 2016 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Share gluster namespace
+from pkgutil import extend_path
+__path__ = extend_path(__path__, __name__)