bootstrap.py

#!/usr/bin/env python3
##############################################################################
#
# Copyright (c) 2006 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Bootstrap a buildout-based project

Simply run this script in a directory containing a buildout.cfg.
The script accepts buildout command-line options, so you can
use the -c option to specify an alternate configuration file.
"""

import os
import shutil
import sys
import tempfile

assert sys.version_info.major == 3, "Run under Python 3!"

from optparse import OptionParser

tmpeggs = tempfile.mkdtemp()

usage = '''\
[DESIRED PYTHON FOR BUILDOUT] bootstrap.py [options]

Bootstraps a buildout-based project.

Simply run this script in a directory containing a buildout.cfg, using the
Python that you want bin/buildout to use.

Note that by using --find-links to point to local resources, you can keep 
this script from going over the network.
'''

parser = OptionParser(usage=usage)
parser.add_option("-v", "--version", help="use a specific zc.buildout version")

parser.add_option("-t", "--accept-buildout-test-releases",
                  dest='accept_buildout_test_releases',
                  action="store_true", default=False,
                  help=("Normally, if you do not specify a --version, the "
                        "bootstrap script and buildout gets the newest "
                        "*final* versions of zc.buildout and its recipes and "
                        "extensions for you.  If you use this flag, "
                        "bootstrap and buildout will get the newest releases "
                        "even if they are alphas or betas."))
parser.add_option("-c", "--config-file",
                  help=("Specify the path to the buildout configuration "
                        "file to be used."))
parser.add_option("-f", "--find-links",
                  help=("Specify a URL to search for buildout releases"))
parser.add_option("--allow-site-packages",
                  action="store_true", default=False,
                  help=("Let bootstrap.py use existing site packages"))


options, args = parser.parse_args()

######################################################################
# load/install setuptools

try:
    if options.allow_site_packages:
        import setuptools
        import pkg_resources
    from urllib.request import urlopen
except ImportError:
    from urllib2 import urlopen

ez = {}
exec(urlopen('https://bootstrap.pypa.io/ez_setup.py').read(), ez)

if not options.allow_site_packages:
    # ez_setup imports site, which adds site packages
    # this will remove them from the path to ensure that incompatible versions 
    # of setuptools are not in the path
    import site
    # inside a virtualenv, there is no 'getsitepackages'. 
    # We can't remove these reliably
    if hasattr(site, 'getsitepackages'):
        for sitepackage_path in site.getsitepackages():
            sys.path[:] = [x for x in sys.path if sitepackage_path not in x]

setup_args = dict(to_dir=tmpeggs, download_delay=0)
ez['use_setuptools'](**setup_args)
import setuptools
import pkg_resources

# This does not (always?) update the default working set.  We will
# do it.
for path in sys.path:
    if path not in pkg_resources.working_set.entries:
        pkg_resources.working_set.add_entry(path)

######################################################################
# Install buildout

ws = pkg_resources.working_set

cmd = [sys.executable, '-c',
       'from setuptools.command.easy_install import main; main()',
       '-mZqNxd', tmpeggs]

find_links = os.environ.get(
    'bootstrap-testing-find-links',
    options.find_links or
    ('http://downloads.buildout.org/'
     if options.accept_buildout_test_releases else None)
    )
if find_links:
    cmd.extend(['-f', find_links])

setuptools_path = ws.find(
    pkg_resources.Requirement.parse('setuptools')).location

requirement = 'zc.buildout'
version = options.version
if version is None and not options.accept_buildout_test_releases:
    # Figure out the most recent final version of zc.buildout.
    import setuptools.package_index
    _final_parts = '*final-', '*final'

    def _final_version(parsed_version):
        for part in parsed_version:
            if (part[:1] == '*') and (part not in _final_parts):
                return False
        return True
    index = setuptools.package_index.PackageIndex(
        search_path=[setuptools_path])
    if find_links:
        index.add_find_links((find_links,))
    req = pkg_resources.Requirement.parse(requirement)
    if index.obtain(req) is not None:
        best = []
        bestv = None
        for dist in index[req.project_name]:
            distv = dist.parsed_version
            if _final_version(distv):
                if bestv is None or distv > bestv:
                    best = [dist]
                    bestv = distv
                elif distv == bestv:
                    best.append(dist)
        if best:
            best.sort()
            version = best[-1].version
if version:
    requirement = '=='.join((requirement, version))
cmd.append(requirement)

import subprocess
if subprocess.call(cmd, env=dict(os.environ, PYTHONPATH=setuptools_path)) != 0:
    raise Exception(
        "Failed to execute command:\n%s" % repr(cmd)[1:-1])

######################################################################
# Import and run buildout

ws.add_entry(tmpeggs)
ws.require(requirement)
import zc.buildout.buildout

if not [a for a in args if '=' not in a]:
    args.append('bootstrap')

# if -c was provided, we push it back into args for buildout' main function
if options.config_file is not None:
    args[0:0] = ['-c', options.config_file]

zc.buildout.buildout.main(args)
shutil.rmtree(tmpeggs)