Python_使用easy_install工具源碼

#!python"""Bootstrap setuptools installationIf you want to use setuptools in your package's setup.py, just include thisfile in the same directory with it, and add this to the top of your setup.py::    from ez_setup import use_setuptools    use_setuptools()If you want to require a specific version of setuptools, set a downloadmirror, or use an alternate download directory, you can do so by supplyingthe appropriate options to ``use_setuptools()``.This file can also be run as a script to install or upgrade setuptools."""import sysDEFAULT_VERSION = "0.6c11"DEFAULT_URL     = "http://pypi.python.org/packages/%s/s/setuptools/" % sys.version[:3]md5_data = {    'setuptools-0.6b1-py2.3.egg': '8822caf901250d848b996b7f25c6e6ca',    'setuptools-0.6b1-py2.4.egg': 'b79a8a403e4502fbb85ee3f1941735cb',    'setuptools-0.6b2-py2.3.egg': '5657759d8a6d8fc44070a9d07272d99b',    'setuptools-0.6b2-py2.4.egg': '4996a8d169d2be661fa32a6e52e4f82a',    'setuptools-0.6b3-py2.3.egg': 'bb31c0fc7399a63579975cad9f5a0618',    'setuptools-0.6b3-py2.4.egg': '38a8c6b3d6ecd22247f179f7da669fac',    'setuptools-0.6b4-py2.3.egg': '62045a24ed4e1ebc77fe039aa4e6f7e5',    'setuptools-0.6b4-py2.4.egg': '4cb2a185d228dacffb2d17f103b3b1c4',    'setuptools-0.6c1-py2.3.egg': 'b3f2b5539d65cb7f74ad79127f1a908c',    'setuptools-0.6c1-py2.4.egg': 'b45adeda0667d2d2ffe14009364f2a4b',    'setuptools-0.6c10-py2.3.egg': 'ce1e2ab5d3a0256456d9fc13800a7090',    'setuptools-0.6c10-py2.4.egg': '57d6d9d6e9b80772c59a53a8433a5dd4',    'setuptools-0.6c10-py2.5.egg': 'de46ac8b1c97c895572e5e8596aeb8c7',    'setuptools-0.6c10-py2.6.egg': '58ea40aef06da02ce641495523a0b7f5',    'setuptools-0.6c11-py2.3.egg': '2baeac6e13d414a9d28e7ba5b5a596de',    'setuptools-0.6c11-py2.4.egg': 'bd639f9b0eac4c42497034dec2ec0c2b',    'setuptools-0.6c11-py2.5.egg': '64c94f3bf7a72a13ec83e0b24f2749b2',    'setuptools-0.6c11-py2.6.egg': 'bfa92100bd772d5a213eedd356d64086',    'setuptools-0.6c2-py2.3.egg': 'f0064bf6aa2b7d0f3ba0b43f20817c27',    'setuptools-0.6c2-py2.4.egg': '616192eec35f47e8ea16cd6a122b7277',    'setuptools-0.6c3-py2.3.egg': 'f181fa125dfe85a259c9cd6f1d7b78fa',    'setuptools-0.6c3-py2.4.egg': 'e0ed74682c998bfb73bf803a50e7b71e',    'setuptools-0.6c3-py2.5.egg': 'abef16fdd61955514841c7c6bd98965e',    'setuptools-0.6c4-py2.3.egg': 'b0b9131acab32022bfac7f44c5d7971f',    'setuptools-0.6c4-py2.4.egg': '2a1f9656d4fbf3c97bf946c0a124e6e2',    'setuptools-0.6c4-py2.5.egg': '8f5a052e32cdb9c72bcf4b5526f28afc',    'setuptools-0.6c5-py2.3.egg': 'ee9fd80965da04f2f3e6b3576e9d8167',    'setuptools-0.6c5-py2.4.egg': 'afe2adf1c01701ee841761f5bcd8aa64',    'setuptools-0.6c5-py2.5.egg': 'a8d3f61494ccaa8714dfed37bccd3d5d',    'setuptools-0.6c6-py2.3.egg': '35686b78116a668847237b69d549ec20',    'setuptools-0.6c6-py2.4.egg': '3c56af57be3225019260a644430065ab',    'setuptools-0.6c6-py2.5.egg': 'b2f8a7520709a5b34f80946de5f02f53',    'setuptools-0.6c7-py2.3.egg': '209fdf9adc3a615e5115b725658e13e2',    'setuptools-0.6c7-py2.4.egg': '5a8f954807d46a0fb67cf1f26c55a82e',    'setuptools-0.6c7-py2.5.egg': '45d2ad28f9750e7434111fde831e8372',    'setuptools-0.6c8-py2.3.egg': '50759d29b349db8cfd807ba8303f1902',    'setuptools-0.6c8-py2.4.egg': 'cba38d74f7d483c06e9daa6070cce6de',    'setuptools-0.6c8-py2.5.egg': '1721747ee329dc150590a58b3e1ac95b',    'setuptools-0.6c9-py2.3.egg': 'a83c4020414807b496e4cfbe08507c03',    'setuptools-0.6c9-py2.4.egg': '260a2be2e5388d66bdaee06abec6342a',    'setuptools-0.6c9-py2.5.egg': 'fe67c3e5a17b12c0e7c541b7ea43a8e6',    'setuptools-0.6c9-py2.6.egg': 'ca37b1ff16fa2ede6e19383e7b59245a',}import sys, ostry: from hashlib import md5except ImportError: from md5 import md5def _validate_md5(egg_name, data):    if egg_name in md5_data:        digest = md5(data).hexdigest()        if digest != md5_data[egg_name]:            print >>sys.stderr, (                "md5 validation of %s failed!  (Possible download problem?)"                % egg_name            )            sys.exit(2)    return datadef use_setuptools(    version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir,    download_delay=15):    """Automatically find/download setuptools and make it available on sys.path    `version` should be a valid setuptools version number that is available    as an egg for download under the `download_base` URL (which should end with    a '/').  `to_dir` is the directory where setuptools will be downloaded, if    it is not already available.  If `download_delay` is specified, it should    be the number of seconds that will be paused before initiating a download,    should one be required.  If an older version of setuptools is installed,    this routine will print a message to ``sys.stderr`` and raise SystemExit in    an attempt to abort the calling script.    """    was_imported = 'pkg_resources' in sys.modules or 'setuptools' in sys.modules    def do_download():        egg = download_setuptools(version, download_base, to_dir, download_delay)        sys.path.insert(0, egg)        import setuptools; setuptools.bootstrap_install_from = egg    try:        import pkg_resources    except ImportError:        return do_download()           try:        pkg_resources.require("setuptools>="+version); return    except pkg_resources.VersionConflict, e:        if was_imported:            print >>sys.stderr, (            "The required version of setuptools (>=%s) is not available, and\n"            "can't be installed while this script is running. Please install\n"            " a more recent version first, using 'easy_install -U setuptools'."            "\n\n(Currently using %r)"            ) % (version, e.args[0])            sys.exit(2)    except pkg_resources.DistributionNotFound:        pass    del pkg_resources, sys.modules['pkg_resources']    # reload ok    return do_download()def download_setuptools(    version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir,    delay = 15):    """Download setuptools from a specified location and return its filename    `version` should be a valid setuptools version number that is available    as an egg 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.    """    import urllib2, shutil    egg_name = "setuptools-%s-py%s.egg" % (version,sys.version[:3])    url = download_base + egg_name    saveto = os.path.join(to_dir, egg_name)    src = dst = None    if not os.path.exists(saveto):  # Avoid repeated downloads        try:            from distutils import log            if delay:                log.warn("""---------------------------------------------------------------------------This script requires setuptools version %s to run (even to displayhelp).  I will attempt to download it for you (from%s), butyou may need to enable firewall access for this script first.I will start the download in %d seconds.(Note: if this machine does not have network access, please obtain the file   %sand place it in this directory before rerunning this script.)---------------------------------------------------------------------------""",                    version, download_base, delay, url                ); from time import sleep; sleep(delay)            log.warn("Downloading %s", url)            src = urllib2.urlopen(url)            # Read/write all in one block, so we don't create a corrupt file            # if the download is interrupted.            data = _validate_md5(egg_name, src.read())            dst = open(saveto,"wb"); dst.write(data)        finally:            if src: src.close()            if dst: dst.close()    return os.path.realpath(saveto)def main(argv, version=DEFAULT_VERSION):    """Install or upgrade setuptools and EasyInstall"""    try:        import setuptools    except ImportError:        egg = None        try:            egg = download_setuptools(version, delay=0)            sys.path.insert(0,egg)            from setuptools.command.easy_install import main            return main(list(argv)+[egg])   # we're done here        finally:            if egg and os.path.exists(egg):                os.unlink(egg)    else:        if setuptools.__version__ == '0.0.1':            print >>sys.stderr, (            "You have an obsolete version of setuptools installed.  Please\n"            "remove it from your system entirely before rerunning this script."            )            sys.exit(2)    req = "setuptools>="+version    import pkg_resources    try:        pkg_resources.require(req)    except pkg_resources.VersionConflict:        try:            from setuptools.command.easy_install import main        except ImportError:            from easy_install import main        main(list(argv)+[download_setuptools(delay=0)])        sys.exit(0) # try to force an exit    else:        if argv:            from setuptools.command.easy_install import main            main(argv)        else:            print "Setuptools version",version,"or greater has been installed."            print '(Run "ez_setup.py -U setuptools" to reinstall or upgrade.)'def update_md5(filenames):    """Update our built-in md5 registry"""    import re    for name in filenames:        base = os.path.basename(name)        f = open(name,'rb')        md5_data[base] = md5(f.read()).hexdigest()        f.close()    data = ["    %r: %r,\n" % it for it in md5_data.items()]    data.sort()    repl = "".join(data)    import inspect    srcfile = inspect.getsourcefile(sys.modules[__name__])    f = open(srcfile, 'rb'); src = f.read(); f.close()    match = re.search("\nmd5_data = {\n([^}]+)}", src)    if not match:        print >>sys.stderr, "Internal error!"        sys.exit(2)    src = src[:match.start(1)] + repl + src[match.end(1):]    f = open(srcfile,'w')    f.write(src)    f.close()if __name__=='__main__':    if len(sys.argv)>2 and sys.argv[1]=='--md5update':        update_md5(sys.argv[2:])    else:        main(sys.argv[1:])