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#!/usr/bin/env python |
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"""Bootstrap setuptools installation |
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To use setuptools in your package's setup.py, include this |
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file in the same directory 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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To require a specific version of setuptools, set a download |
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mirror, or use an alternate download directory, simply supply |
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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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import os |
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import shutil |
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import sys |
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import tempfile |
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import zipfile |
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import optparse |
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import subprocess |
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import platform |
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import textwrap |
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import contextlib |
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from distutils import log |
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try: |
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from site import USER_SITE |
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except ImportError: |
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USER_SITE = None |
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DEFAULT_VERSION = "3.5.1" |
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DEFAULT_URL = "https://pypi.python.org/packages/source/s/setuptools/" |
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def _python_cmd(*args): |
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""" |
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Return True if the command succeeded. |
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""" |
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args = (sys.executable,) + args |
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return subprocess.call(args) == 0 |
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def _install(archive_filename, install_args=()): |
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with archive_context(archive_filename): |
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# installing |
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log.warn('Installing Setuptools') |
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if not _python_cmd('setup.py', 'install', *install_args): |
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log.warn('Something went wrong during the installation.') |
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log.warn('See the error message above.') |
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# exitcode will be 2 |
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return 2 |
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def _build_egg(egg, archive_filename, to_dir): |
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with archive_context(archive_filename): |
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# building an egg |
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log.warn('Building a Setuptools egg in %s', to_dir) |
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_python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir) |
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# returning the result |
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log.warn(egg) |
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if not os.path.exists(egg): |
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raise IOError('Could not build the egg.') |
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def get_zip_class(): |
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""" |
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Supplement ZipFile class to support context manager for Python 2.6 |
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""" |
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class ContextualZipFile(zipfile.ZipFile): |
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def __enter__(self): |
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return self |
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def __exit__(self, type, value, traceback): |
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self.close |
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return zipfile.ZipFile if hasattr(zipfile.ZipFile, '__exit__') else \ |
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ContextualZipFile |
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@contextlib.contextmanager |
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def archive_context(filename): |
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# extracting the archive |
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tmpdir = tempfile.mkdtemp() |
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log.warn('Extracting in %s', tmpdir) |
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old_wd = os.getcwd() |
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try: |
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os.chdir(tmpdir) |
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with get_zip_class()(filename) as archive: |
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archive.extractall() |
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# going in the directory |
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subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0]) |
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os.chdir(subdir) |
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log.warn('Now working in %s', subdir) |
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yield |
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finally: |
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os.chdir(old_wd) |
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shutil.rmtree(tmpdir) |
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def _do_download(version, download_base, to_dir, download_delay): |
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egg = os.path.join(to_dir, 'setuptools-%s-py%d.%d.egg' |
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% (version, sys.version_info[0], sys.version_info[1])) |
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if not os.path.exists(egg): |
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archive = download_setuptools(version, download_base, |
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to_dir, download_delay) |
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_build_egg(egg, archive, to_dir) |
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sys.path.insert(0, egg) |
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# Remove previously-imported pkg_resources if present (see |
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# https://bitbucket.org/pypa/setuptools/pull-request/7/ for details). |
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if 'pkg_resources' in sys.modules: |
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del sys.modules['pkg_resources'] |
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import setuptools |
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setuptools.bootstrap_install_from = egg |
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def use_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL, |
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to_dir=os.curdir, download_delay=15): |
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to_dir = os.path.abspath(to_dir) |
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rep_modules = 'pkg_resources', 'setuptools' |
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imported = set(sys.modules).intersection(rep_modules) |
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try: |
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import pkg_resources |
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except ImportError: |
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return _do_download(version, download_base, to_dir, download_delay) |
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try: |
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pkg_resources.require("setuptools>=" + version) |
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return |
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except pkg_resources.DistributionNotFound: |
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return _do_download(version, download_base, to_dir, download_delay) |
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except pkg_resources.VersionConflict as VC_err: |
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if imported: |
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msg = textwrap.dedent(""" |
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The required version of setuptools (>={version}) is not available, |
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and can't be installed while this script is running. Please |
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install a more recent version first, using |
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'easy_install -U setuptools'. |
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(Currently using {VC_err.args[0]!r}) |
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""").format(VC_err=VC_err, version=version) |
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sys.stderr.write(msg) |
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sys.exit(2) |
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# otherwise, reload ok |
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del pkg_resources, sys.modules['pkg_resources'] |
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return _do_download(version, download_base, to_dir, download_delay) |
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def _clean_check(cmd, target): |
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""" |
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Run the command to download target. If the command fails, clean up before |
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re-raising the error. |
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""" |
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try: |
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subprocess.check_call(cmd) |
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except subprocess.CalledProcessError: |
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if os.access(target, os.F_OK): |
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os.unlink(target) |
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raise |
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def download_file_powershell(url, target): |
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""" |
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Download the file at url to target using Powershell (which will validate |
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trust). Raise an exception if the command cannot complete. |
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""" |
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target = os.path.abspath(target) |
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cmd = [ |
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'powershell', |
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'-Command', |
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"(new-object System.Net.WebClient).DownloadFile(%(url)r, %(target)r)" % vars(), |
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] |
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_clean_check(cmd, target) |
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def has_powershell(): |
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if platform.system() != 'Windows': |
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return False |
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cmd = ['powershell', '-Command', 'echo test'] |
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devnull = open(os.path.devnull, 'wb') |
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try: |
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try: |
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subprocess.check_call(cmd, stdout=devnull, stderr=devnull) |
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except Exception: |
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return False |
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finally: |
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devnull.close() |
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return True |
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download_file_powershell.viable = has_powershell |
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def download_file_curl(url, target): |
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cmd = ['curl', url, '--silent', '--output', target] |
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_clean_check(cmd, target) |
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def has_curl(): |
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cmd = ['curl', '--version'] |
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devnull = open(os.path.devnull, 'wb') |
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try: |
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try: |
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subprocess.check_call(cmd, stdout=devnull, stderr=devnull) |
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except Exception: |
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return False |
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finally: |
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devnull.close() |
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return True |
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download_file_curl.viable = has_curl |
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def download_file_wget(url, target): |
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cmd = ['wget', url, '--quiet', '--output-document', target] |
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_clean_check(cmd, target) |
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def has_wget(): |
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cmd = ['wget', '--version'] |
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devnull = open(os.path.devnull, 'wb') |
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try: |
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try: |
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subprocess.check_call(cmd, stdout=devnull, stderr=devnull) |
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except Exception: |
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return False |
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finally: |
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devnull.close() |
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return True |
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download_file_wget.viable = has_wget |
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def download_file_insecure(url, target): |
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""" |
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Use Python to download the file, even though it cannot authenticate the |
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connection. |
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""" |
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try: |
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from urllib.request import urlopen |
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except ImportError: |
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from urllib2 import urlopen |
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src = dst = None |
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try: |
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src = 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(target, "wb") |
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dst.write(data) |
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finally: |
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if src: |
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src.close() |
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if dst: |
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dst.close() |
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download_file_insecure.viable = lambda: True |
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def get_best_downloader(): |
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downloaders = [ |
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download_file_powershell, |
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download_file_curl, |
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download_file_wget, |
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download_file_insecure, |
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] |
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for dl in downloaders: |
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if dl.viable(): |
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return dl |
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def download_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL, |
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to_dir=os.curdir, delay=15, downloader_factory=get_best_downloader): |
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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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`delay` is the number of seconds to pause before an actual download |
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attempt. |
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``downloader_factory`` should be a function taking no arguments and |
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returning a function for downloading a URL to a target. |
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""" |
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# making sure we use the absolute path |
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to_dir = os.path.abspath(to_dir) |
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zip_name = "setuptools-%s.zip" % version |
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url = download_base + zip_name |
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saveto = os.path.join(to_dir, zip_name) |
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if not os.path.exists(saveto): # Avoid repeated downloads |
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log.warn("Downloading %s", url) |
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downloader = downloader_factory() |
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downloader(url, saveto) |
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return os.path.realpath(saveto) |
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def _build_install_args(options): |
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""" |
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Build the arguments to 'python setup.py install' on the setuptools package |
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""" |
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return ['--user'] if options.user_install else [] |
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def _parse_args(): |
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""" |
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Parse the command line for options |
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""" |
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parser = optparse.OptionParser() |
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parser.add_option( |
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'--user', dest='user_install', action='store_true', default=False, |
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help='install in user site package (requires Python 2.6 or later)') |
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parser.add_option( |
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'--download-base', dest='download_base', metavar="URL", |
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default=DEFAULT_URL, |
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help='alternative URL from where to download the setuptools package') |
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parser.add_option( |
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'--insecure', dest='downloader_factory', action='store_const', |
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const=lambda: download_file_insecure, default=get_best_downloader, |
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help='Use internal, non-validating downloader' |
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) |
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parser.add_option( |
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'--version', help="Specify which version to download", |
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default=DEFAULT_VERSION, |
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) |
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options, args = parser.parse_args() |
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# positional arguments are ignored |
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return options |
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def main(): |
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"""Install or upgrade setuptools and EasyInstall""" |
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options = _parse_args() |
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archive = download_setuptools( |
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version=options.version, |
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download_base=options.download_base, |
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downloader_factory=options.downloader_factory, |
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) |
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return _install(archive, _build_install_args(options)) |
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if __name__ == '__main__': |
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sys.exit(main()) |
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Tobias Perschon
5 years ago