#!/usr/bin/env python
#
# Copyright 2007 Google 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.
#
"""Dependencies vendoring helpers."""
import os.path
import site
import sys
PYTHON_VERSION = 'python%d.%d' % (sys.version_info[0], sys.version_info[1])
def add(path, index=1):
"""Insert site dir or virtualenv at a given index in sys.path.
Args:
path: relative path to a site dir or virtualenv.
index: sys.path position to insert the site dir.
Raises:
ValueError: path doesn't exist.
"""
venv_path = os.path.join(path, 'lib', PYTHON_VERSION, 'site-packages')
if os.path.isdir(venv_path):
site_dir = venv_path
elif os.path.isdir(path):
site_dir = path
else:
raise ValueError('virtualenv: cannot access %s: '
'No such virtualenv or site directory' % path)
sys_path = sys.path[:]
del sys.path[index:]
site.addsitedir(site_dir)
sys.path.extend(sys_path[index:])
