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Added ez_setup.py -- companion to [65]
git-svn-id: http://code.djangoproject.com/svn/django/trunk@66 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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ez_setup.py
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164
ez_setup.py
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#!python
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"""Bootstrap setuptools installation
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If you want to use setuptools in your package's setup.py, just include this
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file in the same directory with it, and add this to the top of your setup.py::
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from ez_setup import use_setuptools
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use_setuptools()
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If you want to require a specific version of setuptools, set a download
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mirror, or use an alternate download directory, you can do so by supplying
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the appropriate options to ``use_setuptools()``.
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This file can also be run as a script to install or upgrade setuptools.
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"""
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DEFAULT_VERSION = "0.5a12"
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DEFAULT_URL = "http://www.python.org/packages/source/s/setuptools/"
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import sys, os
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def use_setuptools(
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version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir
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):
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"""Automatically find/download setuptools and make it available on sys.path
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`version` should be a valid setuptools version number that is available
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as an egg for download under the `download_base` URL (which should end with
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a '/'). `to_dir` is the directory where setuptools will be downloaded, if
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it is not already available.
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If an older version of setuptools is installed, this will print a message
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to ``sys.stderr`` and raise SystemExit in an attempt to abort the calling
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script.
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"""
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try:
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import setuptools
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if setuptools.__version__ == '0.0.1':
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print >>sys.stderr, (
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"You have an obsolete version of setuptools installed. Please\n"
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"remove it from your system entirely before rerunning this script."
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)
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sys.exit(2)
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except ImportError:
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egg = download_setuptools(version, download_base, to_dir)
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sys.path.insert(0, egg)
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import setuptools; setuptools.bootstrap_install_from = egg
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import pkg_resources
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try:
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pkg_resources.require("setuptools>="+version)
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except pkg_resources.VersionConflict:
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# XXX could we install in a subprocess here?
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print >>sys.stderr, (
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"The required version of setuptools (>=%s) is not available, and\n"
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"can't be installed while this script is running. Please install\n"
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" a more recent version first."
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) % version
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sys.exit(2)
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def download_setuptools(
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version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir
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):
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"""Download setuptools from a specified location and return its filename
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`version` should be a valid setuptools version number that is available
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as an egg for download under the `download_base` URL (which should end
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with a '/'). `to_dir` is the directory where the egg will be downloaded.
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"""
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import urllib2, shutil
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egg_name = "setuptools-%s-py%s.egg" % (version,sys.version[:3])
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url = download_base + egg_name + '.zip' # XXX
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saveto = os.path.join(to_dir, egg_name)
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src = dst = None
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if not os.path.exists(saveto): # Avoid repeated downloads
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try:
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from distutils import log
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log.warn("Downloading %s", url)
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src = urllib2.urlopen(url)
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# Read/write all in one block, so we don't create a corrupt file
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# if the download is interrupted.
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data = src.read()
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dst = open(saveto,"wb")
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dst.write(data)
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finally:
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if src: src.close()
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if dst: dst.close()
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return os.path.realpath(saveto)
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def main(argv, version=DEFAULT_VERSION):
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"""Install or upgrade setuptools and EasyInstall"""
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try:
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import setuptools
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except ImportError:
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import tempfile, shutil
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tmpdir = tempfile.mkdtemp(prefix="easy_install-")
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try:
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egg = download_setuptools(version, to_dir=tmpdir)
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sys.path.insert(0,egg)
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from setuptools.command.easy_install import main
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main(list(argv)+[egg])
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finally:
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shutil.rmtree(tmpdir)
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else:
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if setuptools.__version__ == '0.0.1':
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# tell the user to uninstall obsolete version
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use_setuptools(version)
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req = "setuptools>="+version
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import pkg_resources
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try:
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pkg_resources.require(req)
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except pkg_resources.VersionConflict:
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try:
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from setuptools.command.easy_install import main
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except ImportError:
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from easy_install import main
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main(list(argv)+[download_setuptools()])
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sys.exit(0) # try to force an exit
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else:
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if argv:
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from setuptools.command.easy_install import main
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main(argv)
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else:
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print "Setuptools version",version,"or greater has been installed."
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print '(Run "ez_setup.py -U setuptools" to reinstall or upgrade.)'
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if __name__=='__main__':
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main(sys.argv[1:])
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