diff options
Diffstat (limited to 'ez_setup.py')
| -rw-r--r-- | ez_setup.py | 426 |
1 files changed, 426 insertions, 0 deletions
diff --git a/ez_setup.py b/ez_setup.py new file mode 100644 index 00000000..4ef3ee01 --- /dev/null +++ b/ez_setup.py @@ -0,0 +1,426 @@ +#!/usr/bin/env python + +""" +Setuptools bootstrapping installer. + +Maintained at https://github.com/pypa/setuptools/tree/bootstrap. + +Run this script to install or upgrade setuptools. +""" + +import os +import shutil +import sys +import tempfile +import zipfile +import optparse +import subprocess +import platform +import textwrap +import contextlib +import json +import codecs + +from distutils import log + +try: + from urllib.request import urlopen + from urllib.parse import urljoin +except ImportError: + from urllib2 import urlopen + from urlparse import urljoin + +try: + from site import USER_SITE +except ImportError: + USER_SITE = None + +LATEST = object() +DEFAULT_VERSION = LATEST +DEFAULT_URL = "https://pypi.io/packages/source/s/setuptools/" +DEFAULT_SAVE_DIR = os.curdir + + +def _python_cmd(*args): + """ + Execute a command. + + Return True if the command succeeded. + """ + args = (sys.executable,) + args + return subprocess.call(args) == 0 + + +def _install(archive_filename, install_args=()): + """Install Setuptools.""" + with archive_context(archive_filename): + # installing + log.warn('Installing Setuptools') + if not _python_cmd('setup.py', 'install', *install_args): + log.warn('Something went wrong during the installation.') + log.warn('See the error message above.') + # exitcode will be 2 + return 2 + + +def _build_egg(egg, archive_filename, to_dir): + """Build Setuptools egg.""" + with archive_context(archive_filename): + # building an egg + log.warn('Building a Setuptools egg in %s', to_dir) + _python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir) + # returning the result + log.warn(egg) + if not os.path.exists(egg): + raise IOError('Could not build the egg.') + + +class ContextualZipFile(zipfile.ZipFile): + + """Supplement ZipFile class to support context manager for Python 2.6.""" + + def __enter__(self): + return self + + def __exit__(self, type, value, traceback): + self.close() + + def __new__(cls, *args, **kwargs): + """Construct a ZipFile or ContextualZipFile as appropriate.""" + if hasattr(zipfile.ZipFile, '__exit__'): + return zipfile.ZipFile(*args, **kwargs) + return super(ContextualZipFile, cls).__new__(cls) + + +@contextlib.contextmanager +def archive_context(filename): + """ + Unzip filename to a temporary directory, set to the cwd. + + The unzipped target is cleaned up after. + """ + tmpdir = tempfile.mkdtemp() + log.warn('Extracting in %s', tmpdir) + old_wd = os.getcwd() + try: + os.chdir(tmpdir) + with ContextualZipFile(filename) as archive: + archive.extractall() + + # going in the directory + subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0]) + os.chdir(subdir) + log.warn('Now working in %s', subdir) + yield + + finally: + os.chdir(old_wd) + shutil.rmtree(tmpdir) + + +def _do_download(version, download_base, to_dir, download_delay): + """Download Setuptools.""" + py_desig = 'py{sys.version_info[0]}.{sys.version_info[1]}'.format(sys=sys) + tp = 'setuptools-{version}-{py_desig}.egg' + egg = os.path.join(to_dir, tp.format(**locals())) + if not os.path.exists(egg): + archive = download_setuptools(version, download_base, + to_dir, download_delay) + _build_egg(egg, archive, to_dir) + sys.path.insert(0, egg) + + # Remove previously-imported pkg_resources if present (see + # https://bitbucket.org/pypa/setuptools/pull-request/7/ for details). + if 'pkg_resources' in sys.modules: + _unload_pkg_resources() + + import setuptools + setuptools.bootstrap_install_from = egg + + +def use_setuptools( + version=DEFAULT_VERSION, download_base=DEFAULT_URL, + to_dir=DEFAULT_SAVE_DIR, download_delay=15): + """ + Ensure that a setuptools version is installed. + + Return None. Raise SystemExit if the requested version + or later cannot be installed. + """ + version = _resolve_version(version) + to_dir = os.path.abspath(to_dir) + + # prior to importing, capture the module state for + # representative modules. + rep_modules = 'pkg_resources', 'setuptools' + imported = set(sys.modules).intersection(rep_modules) + + try: + import pkg_resources + pkg_resources.require("setuptools>=" + version) + # a suitable version is already installed + return + except ImportError: + # pkg_resources not available; setuptools is not installed; download + pass + except pkg_resources.DistributionNotFound: + # no version of setuptools was found; allow download + pass + except pkg_resources.VersionConflict as VC_err: + if imported: + _conflict_bail(VC_err, version) + + # otherwise, unload pkg_resources to allow the downloaded version to + # take precedence. + del pkg_resources + _unload_pkg_resources() + + return _do_download(version, download_base, to_dir, download_delay) + + +def _conflict_bail(VC_err, version): + """ + Setuptools was imported prior to invocation, so it is + unsafe to unload it. Bail out. + """ + conflict_tmpl = textwrap.dedent(""" + The required version of setuptools (>={version}) is not available, + and can't be installed while this script is running. Please + install a more recent version first, using + 'easy_install -U setuptools'. + + (Currently using {VC_err.args[0]!r}) + """) + msg = conflict_tmpl.format(**locals()) + sys.stderr.write(msg) + sys.exit(2) + + +def _unload_pkg_resources(): + sys.meta_path = [ + importer + for importer in sys.meta_path + if importer.__class__.__module__ != 'pkg_resources.extern' + ] + del_modules = [ + name for name in sys.modules + if name.startswith('pkg_resources') + ] + for mod_name in del_modules: + del sys.modules[mod_name] + + +def _clean_check(cmd, target): + """ + Run the command to download target. + + If the command fails, clean up before re-raising the error. + """ + try: + subprocess.check_call(cmd) + except subprocess.CalledProcessError: + if os.access(target, os.F_OK): + os.unlink(target) + raise + + +def download_file_powershell(url, target): + """ + Download the file at url to target using Powershell. + + Powershell will validate trust. + Raise an exception if the command cannot complete. + """ + target = os.path.abspath(target) + ps_cmd = ( + "[System.Net.WebRequest]::DefaultWebProxy.Credentials = " + "[System.Net.CredentialCache]::DefaultCredentials; " + '(new-object System.Net.WebClient).DownloadFile("%(url)s", "%(target)s")' + % locals() + ) + cmd = [ + 'powershell', + '-Command', + ps_cmd, + ] + _clean_check(cmd, target) + + +def has_powershell(): + """Determine if Powershell is available.""" + if platform.system() != 'Windows': + return False + cmd = ['powershell', '-Command', 'echo test'] + with open(os.path.devnull, 'wb') as devnull: + try: + subprocess.check_call(cmd, stdout=devnull, stderr=devnull) + except Exception: + return False + return True +download_file_powershell.viable = has_powershell + + +def download_file_curl(url, target): + cmd = ['curl', url, '--location', '--silent', '--output', target] + _clean_check(cmd, target) + + +def has_curl(): + cmd = ['curl', '--version'] + with open(os.path.devnull, 'wb') as devnull: + try: + subprocess.check_call(cmd, stdout=devnull, stderr=devnull) + except Exception: + return False + return True +download_file_curl.viable = has_curl + + +def download_file_wget(url, target): + cmd = ['wget', url, '--quiet', '--output-document', target] + _clean_check(cmd, target) + + +def has_wget(): + cmd = ['wget', '--version'] + with open(os.path.devnull, 'wb') as devnull: + try: + subprocess.check_call(cmd, stdout=devnull, stderr=devnull) + except Exception: + return False + return True +download_file_wget.viable = has_wget + + +def download_file_insecure(url, target): + """Use Python to download the file, without connection authentication.""" + src = urlopen(url) + try: + # Read all the data in one block. + data = src.read() + finally: + src.close() + + # Write all the data in one block to avoid creating a partial file. + with open(target, "wb") as dst: + dst.write(data) +download_file_insecure.viable = lambda: True + + +def get_best_downloader(): + downloaders = ( + download_file_powershell, + download_file_curl, + download_file_wget, + download_file_insecure, + ) + viable_downloaders = (dl for dl in downloaders if dl.viable()) + return next(viable_downloaders, None) + + +def download_setuptools( + version=DEFAULT_VERSION, download_base=DEFAULT_URL, + to_dir=DEFAULT_SAVE_DIR, delay=15, + downloader_factory=get_best_downloader): + """ + Download setuptools from a specified location and return its filename. + + `version` should be a valid setuptools version number that is available + as an sdist for download under the `download_base` URL (which should end + with a '/'). `to_dir` is the directory where the egg will be downloaded. + `delay` is the number of seconds to pause before an actual download + attempt. + + ``downloader_factory`` should be a function taking no arguments and + returning a function for downloading a URL to a target. + """ + version = _resolve_version(version) + # making sure we use the absolute path + to_dir = os.path.abspath(to_dir) + zip_name = "setuptools-%s.zip" % version + url = download_base + zip_name + saveto = os.path.join(to_dir, zip_name) + if not os.path.exists(saveto): # Avoid repeated downloads + log.warn("Downloading %s", url) + downloader = downloader_factory() + downloader(url, saveto) + return os.path.realpath(saveto) + + +def _resolve_version(version): + """ + Resolve LATEST version + """ + if version is not LATEST: + return version + + meta_url = urljoin(DEFAULT_URL, '/pypi/setuptools/json') + resp = urlopen(meta_url) + with contextlib.closing(resp): + try: + charset = resp.info().get_content_charset() + except Exception: + # Python 2 compat; assume UTF-8 + charset = 'UTF-8' + reader = codecs.getreader(charset) + doc = json.load(reader(resp)) + + return str(doc['info']['version']) + + +def _build_install_args(options): + """ + Build the arguments to 'python setup.py install' on the setuptools package. + + Returns list of command line arguments. + """ + return ['--user'] if options.user_install else [] + + +def _parse_args(): + """Parse the command line for options.""" + parser = optparse.OptionParser() + parser.add_option( + '--user', dest='user_install', action='store_true', default=False, + help='install in user site package') + parser.add_option( + '--download-base', dest='download_base', metavar="URL", + default=DEFAULT_URL, + help='alternative URL from where to download the setuptools package') + parser.add_option( + '--insecure', dest='downloader_factory', action='store_const', + const=lambda: download_file_insecure, default=get_best_downloader, + help='Use internal, non-validating downloader' + ) + parser.add_option( + '--version', help="Specify which version to download", + default=DEFAULT_VERSION, + ) + parser.add_option( + '--to-dir', + help="Directory to save (and re-use) package", + default=DEFAULT_SAVE_DIR, + ) + options, args = parser.parse_args() + # positional arguments are ignored + return options + + +def _download_args(options): + """Return args for download_setuptools function from cmdline args.""" + return dict( + version=options.version, + download_base=options.download_base, + downloader_factory=options.downloader_factory, + to_dir=options.to_dir, + ) + + +def main(): + """Install or upgrade setuptools and EasyInstall.""" + options = _parse_args() + archive = download_setuptools(**_download_args(options)) + return _install(archive, _build_install_args(options)) + +if __name__ == '__main__': + sys.exit(main()) |