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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Install the pip dependency from source or use the one provided by the system.
Script returns a location to the pip installation, unless it is already
part of the system install.
:author: Michael Mulich
:copyright: 2010 by Penn State University
:organization: WebLion Group, Penn State University
:license: GPL, see LICENSE for more detail
"""
import os
import sys
from optparse import OptionParser
from tempfile import mkdtemp
assert sys.version_info >= (2, 7), "Python >= 2.7 is required"
from subprocess import Popen, PIPE
try:
import pkg_resources
from setuptools.package_index import PackageIndex
requirement_parser = pkg_resources.Requirement.parse
except ImportError:
raise RuntimeError("This installation script require Setuptools "
"to be installed prior to the build. Please "
"install Setuptools or Distribute before continuing.")
__version__ = '0.1.0'
USAGE = "usage: %prog [options] PIP_VERSION [SRC_DIR]"
def append_to_python_path(entry):
"""Append an entry to the PYTHONPATH environment value."""
python_path = os.environ.get('PYTHONPATH', None)
if not python_path:
python_path = []
else:
python_path = python_path.split(os.pathsep)
if entry not in python_path:
python_path.append(entry)
python_path = os.pathsep.join(python_path)
return python_path
parser = OptionParser(usage=USAGE)
parser.add_option('--build-location', dest='build_location',
metavar='LOCATION',
default=os.path.abspath(os.curdir),
help="a location where pip should be built")
def main():
options, args = parser.parse_args()
try:
pip_version = args[0]
except IndexError, e:
parser.print_usage()
raise RuntimeError('Failed with: %s' % e)
source = None
if len(args) > 1:
source = os.path.realpath(args[1])
# Check to see if we already have a version of pip we can use.
has_pip = False
try:
pip_reqs = pkg_resources.require('pip>=%s' % pip_version)
except pkg_resources.VersionConflict:
pass
except pkg_resources.DistributionNotFound:
pass
else:
# We already have pip. There is no reason to continue.
new_path_entry = pip_reqs[0].location
python_path = append_to_python_path(new_path_entry)
print('PYTHONPATH=%s' % python_path)
sys.exit(0)
install_dir = options.build_location
# Check to see if pip has already been built.
pip_install = [i for i in os.listdir(install_dir) if i.startswith('pip')]
if not pip_install:
easy_install = 'from setuptools.command.easy_install import main; main()'
cmd = [sys.executable, '-c', easy_install,
# easy_install arguments:
'-mqNxd', install_dir]
# Provide the source or a requirement line
if source:
cmd.append(source)
else:
cmd.append('pip==%s' % pip_version)
# Run easy_install
p = Popen(cmd, stdout=PIPE)
comm = p.communicate()
pip_install = [i
for i in os.listdir(install_dir)
if i.startswith('pip')]
# Append it to the python path for environment variable input.
pip_install = os.path.abspath(os.path.join(install_dir, pip_install[0]))
python_path = append_to_python_path(pip_install)
print('PYTHONPATH=%s' % python_path)
if __name__ == '__main__':
main()
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