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diff --git a/helperscripts/windows-virtualenv/README.txt b/helperscripts/windows-virtualenv/README.txt
new file mode 100644
index 0000000..3c164c5
--- /dev/null
+++ b/helperscripts/windows-virtualenv/README.txt
@@ -0,0 +1,20 @@
+Helper script to create a windows virtual environment.
+
+Dependencies:
+  - cygwin
+  - 7zip
+
+Instructions:
+  Run python <path to window-virtualenv-dir> <env-directory>
+
+  After this <env-directory> will be a virtualenv directory that has pygtk and
+  ffmpeg loaded into it.
+
+  Run:
+
+  source <env-directory>/Scripts/activate
+
+  To set your PATH and other env variables to use that virtualenv.
+
+Warning: using the ~ char didn't seem to work for me under cygwin
+
diff --git a/helperscripts/windows-virtualenv/__main__.py b/helperscripts/windows-virtualenv/__main__.py
new file mode 100755
index 0000000..93ce533
--- /dev/null
+++ b/helperscripts/windows-virtualenv/__main__.py
@@ -0,0 +1,353 @@
+import contextlib
+import hashlib
+import os
+import sys
+import urllib
+import urlparse
+import shutil
+import subprocess
+import tarfile
+import time
+import zipfile
+from optparse import OptionParser
+
+env_dir = build_dir = site_packages_dir = scripts_dir = python_dir = None
+seven_zip_path = None
+working_dir = downloads_dir = None
+options = args = None
+
+# list of (md5 hash, url) tuples for all files that we download
+download_info = [
+    ('1694578c49e56eb1dce494408666e465',
+        'http://lessmsi.googlecode.com/files/lessmsi-v1.0.8.zip'),
+    ('c846d7a5ed186707d3675564a9838cc2', 
+        'http://python.org/ftp/python/2.7.3/python-2.7.3.msi'),
+    ('788df97c3ceb11368c3a938e5acef0b2', 
+        ('http://downloads.sourceforge.net'
+            '/project/py2exe/py2exe/0.6.9/py2exe-0.6.9.zip')),
+    ('4bddf847f81d8de2d73048b113da3dd5', 
+        ('http://ftp.gnome.org/pub/GNOME/binaries/win32/pygtk/2.24/'
+            'pygtk-all-in-one-2.24.2.win32-py2.7.msi')),
+    ('9633cf25444f41b2fb78b0bb3f509ec3',
+        ('http://ffmpeg.zeranoe.com/builds/win32/static/'
+            'ffmpeg-20120426-git-a4b58fd-win32-static.7z')),
+    ('d7e43beabc017a7d892a3d6663e988d4',
+        'http://sourceforge.net/projects/nsis/files/'
+        'NSIS%202/2.46/nsis-2.46.zip/download'),
+    ('9bd44a22bffe0e4e0b71b8b4cf3a80e2',
+        'http://downloads.sourceforge.net/'
+	'project/sevenzip/7-Zip/9.20/7z920.msi'),
+    ('9aa6c2d7229a37a3996270bff411ab22',
+        'http://win32.libav.org/win32/libav-win32-20120821.7z'),
+    ('8f0347331b7023e343dc460378e23c4e',
+	'http://downloads.sourceforge.net/'
+	'project/winsparkle/0.3/WinSparkle-0.3.zip'),
+    ('05b59fdc6b6e6c4530154c0ac52f8a94',
+	'http://downloads.sourceforge.net/'
+	'project/gtk-win/GTK%2B%20Themes%20Package/2009-09-07/'
+	'gtk2-themes-2009-09-07-win32_bin.zip'),
+
+]
+
+def get_download_hash(url):
+    """Get the md5 hash value for a downloaded file.
+
+    :param url: url for the download
+    :returns: md5 hash of the contents of the file, or None if no file found
+    """
+    download_path = get_download_path(url)
+    md5 = hashlib.md5()
+    block_size = 1024 * 10
+    if not os.path.exists(download_path):
+        return None
+    with open(download_path, 'rb') as f:
+        data = f.read(block_size)
+        while data:
+            md5.update(data)
+            data = f.read(block_size)
+    return md5.hexdigest()
+
+
+def download_files():
+    if not os.path.exists(downloads_dir):
+        os.makedirs(downloads_dir)
+    for md5hash, url in download_info:
+        download_path = get_download_path(url)
+        if os.path.exists(download_path):
+            download_hash = get_download_hash(url)
+            if download_hash == md5hash:
+                continue
+            else:
+                writeout("md5 hash verification failed")
+                writeout("  %s", url)
+                writeout("  correct: %s", md5hash)
+                writeout("  downloaded: %s", download_hash)
+        download_url(url)
+
+def download_url(url):
+    """Download a url to the build directory."""
+
+    download_path = get_download_path(url)
+    basename = os.path.basename(download_path)
+    writeout("* Downloading %s", basename)
+    time_info = { 'last': 0}
+    def reporthook(block_count, block_size, total_size):
+        now = time.time()
+        if total_size > 0 and now - time_info['last'] > 0.5:
+            percent_complete = (block_count * block_size * 100.0) / total_size
+            writeout_and_stay("  %0.1f complete", percent_complete)
+            time_info['last'] = now
+    urllib.urlretrieve(url, download_path, reporthook)
+    writeout_and_stay("  100.0%% complete")
+
+
+def get_download_path(url):
+    """Get the path to a downloaded file.
+
+    :param url:
+    """
+    parsed_url = urlparse.urlparse(url)
+    if parsed_url.netloc == 'sourceforge.net':
+        # sourceforge adds an extra "/download" at the end of the url
+        basename = os.path.basename(os.path.dirname(parsed_url.path))
+    else:
+        # default case
+        basename = os.path.basename(parsed_url.path)
+    return os.path.join(downloads_dir, basename)
+
+
+def setup_global_dirs(parser_args):
+    global env_dir, working_dir, build_dir, site_packages_dir, scripts_dir
+    global python_dir, downloads_dir
+
+    env_dir = os.path.abspath(parser_args[0])
+    working_dir = os.getcwd()
+    downloads_dir = os.path.abspath(
+            os.path.join(os.path.dirname(__file__), '..', '..', 'downloads',
+                'windows-virtualenv'))
+    build_dir = os.path.abspath(os.path.join('mvc-env-build'))
+    site_packages_dir = os.path.join(env_dir, "Lib", "site-packages")
+    scripts_dir = os.path.join(env_dir, "Scripts")
+    python_dir = os.path.join(env_dir, "Python")
+
+def parse_args():
+    global options, args
+
+    usage = "usage: %prog [options] env-directory"
+    parser = OptionParser(usage)
+
+    parser.add_option("-f", "--force", dest="force",
+            action="store_true",
+            help="overwrite env directory if it exists")
+
+    (options, args) = parser.parse_args()
+    if len(args) < 1:
+        parser.error("must specify env-directory")
+    if len(args) > 1:
+        parser.error("can only specify one env-directory")
+    setup_global_dirs(args)
+    if os.path.exists(env_dir) and not options.force:
+        parser.error("%s exists.  Use -f to overwrite" % env_dir)
+
+def writeout(msg, *args):
+    """write a line to stdout."""
+    print msg % args
+
+def writeout_and_stay(msg, *args):
+    """write a line to stdout and stay on the same line."""
+
+    # clear out old line
+    print " " * 70 + "\r",
+    # write out new line
+    print (msg % args) + "\r",
+    sys.stdout.flush()
+
+def rmtree_if_exists(directory):
+    """Remove a directory tree, if it exists."""
+    if os.path.exists(directory):
+        if not options.force:
+            raise AssertionError("%s exists and force not set" % directory)
+        writeout("Removing %s", directory)
+        shutil.rmtree(directory)
+
+def check_call(*command_line):
+    subprocess.check_call(command_line)
+
+@contextlib.contextmanager
+def build_dir_context():
+    """Context to create a build directory and delete it afterwards.
+    """
+
+    rmtree_if_exists(build_dir)
+    os.makedirs(build_dir)
+    yield
+    shutil.rmtree(build_dir)
+
+def movetree(source_dir, dest_dir):
+    """Move the contents of source_dir into dest_dir
+
+    For each file/directory in source dir, copy it to dest_dir.  If this would
+    overwrite a file/directory, then an IOError will be raised
+    """
+    for name in os.listdir(source_dir):
+        source_child = os.path.join(source_dir, name)
+        writeout("* moving %s to %s", name, dest_dir)
+        shutil.move(source_child, os.path.join(dest_dir, name))
+
+def extract_zip(zip_path, dest_dir):
+    writeout("* Extracting %s", zip_path)
+    archive = zipfile.ZipFile(zip_path, 'r')
+    for name in archive.namelist():
+        writeout("**  %s", name)
+        archive.extract(name, dest_dir)
+    archive.close()
+
+def extract_tarball(tarball_path, dest_dir):
+    writeout("* Extracting %s", tarball_path)
+    archive = tarfile.open(tarball_path, 'r')
+    archive.extractall(dest_dir)
+    archive.close()
+
+def run_pip_install(package_name, version):
+    pip_path = os.path.join(scripts_dir, 'pip.exe')
+    check_call(pip_path, 'install', "%s==%s" % (package_name, version))
+
+def install_gtk_theme_files():
+    gtk_themes_url = ('http://downloads.sourceforge.net/'
+	'project/gtk-win/GTK%2B%20Themes%20Package/2009-09-07/'
+	'gtk2-themes-2009-09-07-win32_bin.zip')
+    extract_zip(get_download_path(gtk_themes_url), env_dir)
+
+def install_nsis():
+    url = ('http://sourceforge.net/projects/nsis/files/'
+            'NSIS%202/2.46/nsis-2.46.zip/download')
+    zip_path = get_download_path(url)
+    # extract directory to the env directory since all files in the archive
+    # are inside nsis-2.46 directory
+    extract_zip(zip_path, env_dir)
+
+def install_lessmsi():
+    url = "http://lessmsi.googlecode.com/files/lessmsi-v1.0.8.zip"
+    zip_path = get_download_path(url)
+    extract_zip(zip_path, os.path.join(build_dir, 'lessmsi'))
+    # make all files executable
+    for filename in ('lessmsi.exe', 'wix.dll', 'wixcab.dll'):
+        path = os.path.join(build_dir, 'lessmsi', filename)
+        check_call("chmod", "+x", path)
+
+def run_lessmsi(msi_path, output_dir):
+    writeout("* Extracting MSI %s", os.path.basename(msi_path))
+    lessmsi_path = os.path.join(build_dir, 'lessmsi', 'lessmsi.exe')
+    check_call(lessmsi_path, "/x", msi_path, output_dir)
+
+def install_7zip():
+    global seven_zip_path
+    url = 'http://downloads.sourceforge.net/project/sevenzip/7-Zip/9.20/7z920.msi'
+    msi_path = get_download_path(url)
+    build_path = os.path.join(build_dir, 'z7ip')
+    run_lessmsi(msi_path, build_path)
+
+    seven_zip_path = os.path.join(build_path, "SourceDir", "Files", "7-Zip", "7z.exe")
+
+def make_env_dir():
+    rmtree_if_exists(env_dir)
+    os.makedirs(env_dir)
+
+def install_virtualenv():
+    virtualenv_path = os.path.join(os.path.dirname(__file__), "virtualenv.py")
+    python_path = os.path.join(python_dir, "python.exe")
+    check_call("python", virtualenv_path, "-p", python_path, '--clear',
+            env_dir)
+
+def install_python():
+    url = "http://python.org/ftp/python/2.7.3/python-2.7.3.msi"
+    download_path = get_download_path(url)
+    build_path = os.path.join(build_dir, 'Python')
+    run_lessmsi(download_path, build_path)
+    shutil.move(os.path.join(build_path, "SourceDir"), python_dir)
+
+def install_py2exe():
+    url = ("http://downloads.sourceforge.net"
+            "/project/py2exe/py2exe/0.6.9/py2exe-0.6.9.zip")
+    zip_path = get_download_path(url)
+    extract_zip(zip_path, os.path.join(build_dir, 'py2exe'))
+    writeout("* Installing py2exe")
+    os.chdir(os.path.join(build_dir, 'py2exe', 'py2exe-0.6.9'))
+    check_call(os.path.join(scripts_dir, "python.exe"), 'setup.py', 'install')
+    os.chdir(working_dir)
+
+def install_pygtk():
+    url = ('http://ftp.gnome.org/pub/GNOME/binaries/win32/pygtk/2.24/'
+            'pygtk-all-in-one-2.24.2.win32-py2.7.msi')
+    msi_path = get_download_path(url)
+    build_path = os.path.join(build_dir, 'pygtk-all-in-one')
+    run_lessmsi(msi_path, build_path)
+
+    source_package_dir = os.path.join(build_path, "SourceDir", "Lib",
+            "site-packages")
+    writeout("* Copying pygtk site-packages")
+    movetree(source_package_dir, site_packages_dir)
+
+def install_ffmpeg():
+    url = ("http://ffmpeg.zeranoe.com/builds/win32/static/"
+            "ffmpeg-20120426-git-a4b58fd-win32-static.7z")
+    download_path = get_download_path(url)
+    check_call(seven_zip_path, "x", download_path, '-o' + build_dir)
+
+    archive_dir = os.path.join(build_dir,
+            os.path.splitext(os.path.basename(url))[0])
+    dest_dir = os.path.join(env_dir, "ffmpeg")
+
+    os.mkdir(dest_dir)
+    shutil.move(os.path.join(archive_dir, "presets"),
+            os.path.join(dest_dir, "presets"))
+
+    for exe_name in ("ffmpeg.exe", "ffplay.exe", "ffprobe.exe"):
+        shutil.move(os.path.join(archive_dir, "bin", exe_name),
+                os.path.join(dest_dir, exe_name))
+
+def install_avconv():
+    # We use a nightly build of avconv because I (BDK) couldn't find any
+    # official builds after version 7.7, released in June 2011
+    url = 'http://win32.libav.org/win32/libav-win32-20120821.7z'
+    download_path = get_download_path(url)
+    check_call(seven_zip_path, "x", download_path, '-o' + build_dir)
+
+    archive_dir = os.path.join(build_dir,
+            os.path.splitext(os.path.basename(url))[0])
+    dest_dir = os.path.join(env_dir, "avconv")
+    bin_dir = os.path.join(archive_dir, "usr", "bin")
+    lib_dir = os.path.join(archive_dir, "usr", "lib")
+    preset_dir = os.path.join(archive_dir, "usr", "share", "avconv")
+
+    os.mkdir(dest_dir)
+    for src_dir in (bin_dir, lib_dir, preset_dir):
+        for filename in os.listdir(src_dir):
+            shutil.move(os.path.join(src_dir, filename), 
+                    os.path.join(dest_dir, filename))
+
+def install_winsparkle():
+    url = ('http://downloads.sourceforge.net/'
+	    'project/winsparkle/0.3/WinSparkle-0.3.zip')
+    download_path = get_download_path(url)
+    extract_zip(download_path, env_dir)
+
+def main():
+    parse_args()
+    make_env_dir()
+    download_files()
+    with build_dir_context():
+        install_lessmsi()
+        install_7zip()
+        install_python()
+        install_virtualenv()
+        install_py2exe()
+        install_pygtk()
+        install_ffmpeg()
+        install_avconv()
+        install_winsparkle()
+        install_gtk_theme_files()
+        install_nsis()
+
+if __name__ == '__main__':
+    main()
diff --git a/helperscripts/windows-virtualenv/virtualenv.py b/helperscripts/windows-virtualenv/virtualenv.py
new file mode 100755
index 0000000..9cff773
--- /dev/null
+++ b/helperscripts/windows-virtualenv/virtualenv.py
@@ -0,0 +1,2274 @@
+#!/usr/bin/env python
+"""Create a "virtual" Python installation
+"""
+
+# If you change the version here, change it in setup.py
+# and docs/conf.py as well.
+virtualenv_version = "1.7.1.2"
+
+import base64
+import sys
+import os
+import optparse
+import re
+import shutil
+import logging
+import tempfile
+import zlib
+import errno
+import distutils.sysconfig
+from distutils.util import strtobool
+
+try:
+    import subprocess
+except ImportError:
+    if sys.version_info <= (2, 3):
+        print('ERROR: %s' % sys.exc_info()[1])
+        print('ERROR: this script requires Python 2.4 or greater; or at least the subprocess module.')
+        print('If you copy subprocess.py from a newer version of Python this script will probably work')
+        sys.exit(101)
+    else:
+        raise
+try:
+    set
+except NameError:
+    from sets import Set as set
+try:
+    basestring
+except NameError:
+    basestring = str
+
+try:
+    import ConfigParser
+except ImportError:
+    import configparser as ConfigParser
+
+join = os.path.join
+py_version = 'python%s.%s' % (sys.version_info[0], sys.version_info[1])
+
+is_jython = sys.platform.startswith('java')
+is_pypy = hasattr(sys, 'pypy_version_info')
+is_win  = (sys.platform == 'win32')
+abiflags = getattr(sys, 'abiflags', '')
+
+user_dir = os.path.expanduser('~')
+if sys.platform == 'win32':
+    user_dir = os.environ.get('APPDATA', user_dir)  # Use %APPDATA% for roaming
+    default_storage_dir = os.path.join(user_dir, 'virtualenv')
+else:
+    default_storage_dir = os.path.join(user_dir, '.virtualenv')
+default_config_file = os.path.join(default_storage_dir, 'virtualenv.ini')
+
+if is_pypy:
+    expected_exe = 'pypy'
+elif is_jython:
+    expected_exe = 'jython'
+else:
+    expected_exe = 'python'
+
+
+REQUIRED_MODULES = ['os', 'posix', 'posixpath', 'nt', 'ntpath', 'genericpath',
+                    'fnmatch', 'locale', 'encodings', 'codecs',
+                    'stat', 'UserDict', 'readline', 'copy_reg', 'types',
+                    're', 'sre', 'sre_parse', 'sre_constants', 'sre_compile',
+                    'zlib']
+
+REQUIRED_FILES = ['lib-dynload', 'config']
+
+majver, minver = sys.version_info[:2]
+if majver == 2:
+    if minver >= 6:
+        REQUIRED_MODULES.extend(['warnings', 'linecache', '_abcoll', 'abc'])
+    if minver >= 7:
+        REQUIRED_MODULES.extend(['_weakrefset'])
+    if minver <= 3:
+        REQUIRED_MODULES.extend(['sets', '__future__'])
+elif majver == 3:
+    # Some extra modules are needed for Python 3, but different ones
+    # for different versions.
+    REQUIRED_MODULES.extend(['_abcoll', 'warnings', 'linecache', 'abc', 'io',
+                             '_weakrefset', 'copyreg', 'tempfile', 'random',
+                             '__future__', 'collections', 'keyword', 'tarfile',
+                             'shutil', 'struct', 'copy'])
+    if minver >= 2:
+        REQUIRED_FILES[-1] = 'config-%s' % majver
+    if minver == 3:
+        # The whole list of 3.3 modules is reproduced below - the current
+        # uncommented ones are required for 3.3 as of now, but more may be
+        # added as 3.3 development continues.
+        REQUIRED_MODULES.extend([
+            #"aifc",
+            #"antigravity",
+            #"argparse",
+            #"ast",
+            #"asynchat",
+            #"asyncore",
+            "base64",
+            #"bdb",
+            #"binhex",
+            "bisect",
+            #"calendar",
+            #"cgi",
+            #"cgitb",
+            #"chunk",
+            #"cmd",
+            #"codeop",
+            #"code",
+            #"colorsys",
+            #"_compat_pickle",
+            #"compileall",
+            #"concurrent",
+            #"configparser",
+            #"contextlib",
+            #"cProfile",
+            #"crypt",
+            #"csv",
+            #"ctypes",
+            #"curses",
+            #"datetime",
+            #"dbm",
+            #"decimal",
+            #"difflib",
+            #"dis",
+            #"doctest",
+            #"dummy_threading",
+            "_dummy_thread",
+            #"email",
+            #"filecmp",
+            #"fileinput",
+            #"formatter",
+            #"fractions",
+            #"ftplib",
+            #"functools",
+            #"getopt",
+            #"getpass",
+            #"gettext",
+            #"glob",
+            #"gzip",
+            "hashlib",
+            "heapq",
+            "hmac",
+            #"html",
+            #"http",
+            #"idlelib",
+            #"imaplib",
+            #"imghdr",
+            #"importlib",
+            #"inspect",
+            #"json",
+            #"lib2to3",
+            #"logging",
+            #"macpath",
+            #"macurl2path",
+            #"mailbox",
+            #"mailcap",
+            #"_markupbase",
+            #"mimetypes",
+            #"modulefinder",
+            #"multiprocessing",
+            #"netrc",
+            #"nntplib",
+            #"nturl2path",
+            #"numbers",
+            #"opcode",
+            #"optparse",
+            #"os2emxpath",
+            #"pdb",
+            #"pickle",
+            #"pickletools",
+            #"pipes",
+            #"pkgutil",
+            #"platform",
+            #"plat-linux2",
+            #"plistlib",
+            #"poplib",
+            #"pprint",
+            #"profile",
+            #"pstats",
+            #"pty",
+            #"pyclbr",
+            #"py_compile",
+            #"pydoc_data",
+            #"pydoc",
+            #"_pyio",
+            #"queue",
+            #"quopri",
+            "reprlib",
+            "rlcompleter",
+            #"runpy",
+            #"sched",
+            #"shelve",
+            #"shlex",
+            #"smtpd",
+            #"smtplib",
+            #"sndhdr",
+            #"socket",
+            #"socketserver",
+            #"sqlite3",
+            #"ssl",
+            #"stringprep",
+            #"string",
+            #"_strptime",
+            #"subprocess",
+            #"sunau",
+            #"symbol",
+            #"symtable",
+            #"sysconfig",
+            #"tabnanny",
+            #"telnetlib",
+            #"test",
+            #"textwrap",
+            #"this",
+            #"_threading_local",
+            #"threading",
+            #"timeit",
+            #"tkinter",
+            #"tokenize",
+            #"token",
+            #"traceback",
+            #"trace",
+            #"tty",
+            #"turtledemo",
+            #"turtle",
+            #"unittest",
+            #"urllib",
+            #"uuid",
+            #"uu",
+            #"wave",
+            "weakref",
+            #"webbrowser",
+            #"wsgiref",
+            #"xdrlib",
+            #"xml",
+            #"xmlrpc",
+            #"zipfile",
+        ])
+
+if is_pypy:
+    # these are needed to correctly display the exceptions that may happen
+    # during the bootstrap
+    REQUIRED_MODULES.extend(['traceback', 'linecache'])
+
+class Logger(object):
+
+    """
+    Logging object for use in command-line script.  Allows ranges of
+    levels, to avoid some redundancy of displayed information.
+    """
+
+    DEBUG = logging.DEBUG
+    INFO = logging.INFO
+    NOTIFY = (logging.INFO+logging.WARN)/2
+    WARN = WARNING = logging.WARN
+    ERROR = logging.ERROR
+    FATAL = logging.FATAL
+
+    LEVELS = [DEBUG, INFO, NOTIFY, WARN, ERROR, FATAL]
+
+    def __init__(self, consumers):
+        self.consumers = consumers
+        self.indent = 0
+        self.in_progress = None
+        self.in_progress_hanging = False
+
+    def debug(self, msg, *args, **kw):
+        self.log(self.DEBUG, msg, *args, **kw)
+    def info(self, msg, *args, **kw):
+        self.log(self.INFO, msg, *args, **kw)
+    def notify(self, msg, *args, **kw):
+        self.log(self.NOTIFY, msg, *args, **kw)
+    def warn(self, msg, *args, **kw):
+        self.log(self.WARN, msg, *args, **kw)
+    def error(self, msg, *args, **kw):
+        self.log(self.WARN, msg, *args, **kw)
+    def fatal(self, msg, *args, **kw):
+        self.log(self.FATAL, msg, *args, **kw)
+    def log(self, level, msg, *args, **kw):
+        if args:
+            if kw:
+                raise TypeError(
+                    "You may give positional or keyword arguments, not both")
+        args = args or kw
+        rendered = None
+        for consumer_level, consumer in self.consumers:
+            if self.level_matches(level, consumer_level):
+                if (self.in_progress_hanging
+                    and consumer in (sys.stdout, sys.stderr)):
+                    self.in_progress_hanging = False
+                    sys.stdout.write('\n')
+                    sys.stdout.flush()
+                if rendered is None:
+                    if args:
+                        rendered = msg % args
+                    else:
+                        rendered = msg
+                    rendered = ' '*self.indent + rendered
+                if hasattr(consumer, 'write'):
+                    consumer.write(rendered+'\n')
+                else:
+                    consumer(rendered)
+
+    def start_progress(self, msg):
+        assert not self.in_progress, (
+            "Tried to start_progress(%r) while in_progress %r"
+            % (msg, self.in_progress))
+        if self.level_matches(self.NOTIFY, self._stdout_level()):
+            sys.stdout.write(msg)
+            sys.stdout.flush()
+            self.in_progress_hanging = True
+        else:
+            self.in_progress_hanging = False
+        self.in_progress = msg
+
+    def end_progress(self, msg='done.'):
+        assert self.in_progress, (
+            "Tried to end_progress without start_progress")
+        if self.stdout_level_matches(self.NOTIFY):
+            if not self.in_progress_hanging:
+                # Some message has been printed out since start_progress
+                sys.stdout.write('...' + self.in_progress + msg + '\n')
+                sys.stdout.flush()
+            else:
+                sys.stdout.write(msg + '\n')
+                sys.stdout.flush()
+        self.in_progress = None
+        self.in_progress_hanging = False
+
+    def show_progress(self):
+        """If we are in a progress scope, and no log messages have been
+        shown, write out another '.'"""
+        if self.in_progress_hanging:
+            sys.stdout.write('.')
+            sys.stdout.flush()
+
+    def stdout_level_matches(self, level):
+        """Returns true if a message at this level will go to stdout"""
+        return self.level_matches(level, self._stdout_level())
+
+    def _stdout_level(self):
+        """Returns the level that stdout runs at"""
+        for level, consumer in self.consumers:
+            if consumer is sys.stdout:
+                return level
+        return self.FATAL
+
+    def level_matches(self, level, consumer_level):
+        """
+        >>> l = Logger([])
+        >>> l.level_matches(3, 4)
+        False
+        >>> l.level_matches(3, 2)
+        True
+        >>> l.level_matches(slice(None, 3), 3)
+        False
+        >>> l.level_matches(slice(None, 3), 2)
+        True
+        >>> l.level_matches(slice(1, 3), 1)
+        True
+        >>> l.level_matches(slice(2, 3), 1)
+        False
+        """
+        if isinstance(level, slice):
+            start, stop = level.start, level.stop
+            if start is not None and start > consumer_level:
+                return False
+            if stop is not None and stop <= consumer_level:
+                return False
+            return True
+        else:
+            return level >= consumer_level
+
+    #@classmethod
+    def level_for_integer(cls, level):
+        levels = cls.LEVELS
+        if level < 0:
+            return levels[0]
+        if level >= len(levels):
+            return levels[-1]
+        return levels[level]
+
+    level_for_integer = classmethod(level_for_integer)
+
+# create a silent logger just to prevent this from being undefined
+# will be overridden with requested verbosity main() is called.
+logger = Logger([(Logger.LEVELS[-1], sys.stdout)])
+
+def mkdir(path):
+    if not os.path.exists(path):
+        logger.info('Creating %s', path)
+        os.makedirs(path)
+    else:
+        logger.info('Directory %s already exists', path)
+
+def copyfileordir(src, dest):
+    if os.path.isdir(src):
+        shutil.copytree(src, dest, True)
+    else:
+        shutil.copy2(src, dest)
+
+def copyfile(src, dest, symlink=True):
+    if not os.path.exists(src):
+        # Some bad symlink in the src
+        logger.warn('Cannot find file %s (bad symlink)', src)
+        return
+    if os.path.exists(dest):
+        logger.debug('File %s already exists', dest)
+        return
+    if not os.path.exists(os.path.dirname(dest)):
+        logger.info('Creating parent directories for %s' % os.path.dirname(dest))
+        os.makedirs(os.path.dirname(dest))
+    if not os.path.islink(src):
+        srcpath = os.path.abspath(src)
+    else:
+        srcpath = os.readlink(src)
+    if symlink and hasattr(os, 'symlink') and not is_win:
+        logger.info('Symlinking %s', dest)
+        try:
+            os.symlink(srcpath, dest)
+        except (OSError, NotImplementedError):
+            logger.info('Symlinking failed, copying to %s', dest)
+            copyfileordir(src, dest)
+    else:
+        logger.info('Copying to %s', dest)
+        copyfileordir(src, dest)
+
+def writefile(dest, content, overwrite=True):
+    if not os.path.exists(dest):
+        logger.info('Writing %s', dest)
+        f = open(dest, 'wb')
+        f.write(content.encode('utf-8'))
+        f.close()
+        return
+    else:
+        f = open(dest, 'rb')
+        c = f.read()
+        f.close()
+        if c != content:
+            if not overwrite:
+                logger.notify('File %s exists with different content; not overwriting', dest)
+                return
+            logger.notify('Overwriting %s with new content', dest)
+            f = open(dest, 'wb')
+            f.write(content.encode('utf-8'))
+            f.close()
+        else:
+            logger.info('Content %s already in place', dest)
+
+def rmtree(dir):
+    if os.path.exists(dir):
+        logger.notify('Deleting tree %s', dir)
+        shutil.rmtree(dir)
+    else:
+        logger.info('Do not need to delete %s; already gone', dir)
+
+def make_exe(fn):
+    if hasattr(os, 'chmod'):
+        oldmode = os.stat(fn).st_mode & 0xFFF # 0o7777
+        newmode = (oldmode | 0x16D) & 0xFFF # 0o555, 0o7777
+        os.chmod(fn, newmode)
+        logger.info('Changed mode of %s to %s', fn, oct(newmode))
+
+def _find_file(filename, dirs):
+    for dir in reversed(dirs):
+        if os.path.exists(join(dir, filename)):
+            return join(dir, filename)
+    return filename
+
+def _install_req(py_executable, unzip=False, distribute=False,
+                 search_dirs=None, never_download=False):
+
+    if search_dirs is None:
+        search_dirs = file_search_dirs()
+
+    if not distribute:
+        setup_fn = 'setuptools-0.6c11-py%s.egg' % sys.version[:3]
+        project_name = 'setuptools'
+        bootstrap_script = EZ_SETUP_PY
+        source = None
+    else:
+        setup_fn = None
+        source = 'distribute-0.6.24.tar.gz'
+        project_name = 'distribute'
+        bootstrap_script = DISTRIBUTE_SETUP_PY
+
+    if setup_fn is not None:
+        setup_fn = _find_file(setup_fn, search_dirs)
+
+    if source is not None:
+        source = _find_file(source, search_dirs)
+
+    if is_jython and os._name == 'nt':
+        # Jython's .bat sys.executable can't handle a command line
+        # argument with newlines
+        fd, ez_setup = tempfile.mkstemp('.py')
+        os.write(fd, bootstrap_script)
+        os.close(fd)
+        cmd = [py_executable, ez_setup]
+    else:
+        cmd = [py_executable, '-c', bootstrap_script]
+    if unzip:
+        cmd.append('--always-unzip')
+    env = {}
+    remove_from_env = []
+    if logger.stdout_level_matches(logger.DEBUG):
+        cmd.append('-v')
+
+    old_chdir = os.getcwd()
+    if setup_fn is not None and os.path.exists(setup_fn):
+        logger.info('Using existing %s egg: %s' % (project_name, setup_fn))
+        cmd.append(setup_fn)
+        if os.environ.get('PYTHONPATH'):
+            env['PYTHONPATH'] = setup_fn + os.path.pathsep + os.environ['PYTHONPATH']
+        else:
+            env['PYTHONPATH'] = setup_fn
+    else:
+        # the source is found, let's chdir
+        if source is not None and os.path.exists(source):
+            logger.info('Using existing %s egg: %s' % (project_name, source))
+            os.chdir(os.path.dirname(source))
+            # in this case, we want to be sure that PYTHONPATH is unset (not
+            # just empty, really unset), else CPython tries to import the
+            # site.py that it's in virtualenv_support
+            remove_from_env.append('PYTHONPATH')
+        else:
+            if never_download:
+                logger.fatal("Can't find any local distributions of %s to install "
+                             "and --never-download is set.  Either re-run virtualenv "
+                             "without the --never-download option, or place a %s "
+                             "distribution (%s) in one of these "
+                             "locations: %r" % (project_name, project_name,
+                                                setup_fn or source,
+                                                search_dirs))
+                sys.exit(1)
+
+            logger.info('No %s egg found; downloading' % project_name)
+        cmd.extend(['--always-copy', '-U', project_name])
+    logger.start_progress('Installing %s...' % project_name)
+    logger.indent += 2
+    cwd = None
+    if project_name == 'distribute':
+        env['DONT_PATCH_SETUPTOOLS'] = 'true'
+
+    def _filter_ez_setup(line):
+        return filter_ez_setup(line, project_name)
+
+    if not os.access(os.getcwd(), os.W_OK):
+        cwd = tempfile.mkdtemp()
+        if source is not None and os.path.exists(source):
+            # the current working dir is hostile, let's copy the
+            # tarball to a temp dir
+            target = os.path.join(cwd, os.path.split(source)[-1])
+            shutil.copy(source, target)
+    try:
+        call_subprocess(cmd, show_stdout=False,
+                        filter_stdout=_filter_ez_setup,
+                        extra_env=env,
+                        remove_from_env=remove_from_env,
+                        cwd=cwd)
+    finally:
+        logger.indent -= 2
+        logger.end_progress()
+        if os.getcwd() != old_chdir:
+            os.chdir(old_chdir)
+        if is_jython and os._name == 'nt':
+            os.remove(ez_setup)
+
+def file_search_dirs():
+    here = os.path.dirname(os.path.abspath(__file__))
+    dirs = ['.', here,
+            join(here, 'virtualenv_support')]
+    if os.path.splitext(os.path.dirname(__file__))[0] != 'virtualenv':
+        # Probably some boot script; just in case virtualenv is installed...
+        try:
+            import virtualenv
+        except ImportError:
+            pass
+        else:
+            dirs.append(os.path.join(os.path.dirname(virtualenv.__file__), 'virtualenv_support'))
+    return [d for d in dirs if os.path.isdir(d)]
+
+def install_setuptools(py_executable, unzip=False,
+                       search_dirs=None, never_download=False):
+    _install_req(py_executable, unzip,
+                 search_dirs=search_dirs, never_download=never_download)
+
+def install_distribute(py_executable, unzip=False,
+                       search_dirs=None, never_download=False):
+    _install_req(py_executable, unzip, distribute=True,
+                 search_dirs=search_dirs, never_download=never_download)
+
+_pip_re = re.compile(r'^pip-.*(zip|tar.gz|tar.bz2|tgz|tbz)$', re.I)
+def install_pip(py_executable, search_dirs=None, never_download=False):
+    if search_dirs is None:
+        search_dirs = file_search_dirs()
+
+    filenames = []
+    for dir in search_dirs:
+        filenames.extend([join(dir, fn) for fn in os.listdir(dir)
+                          if _pip_re.search(fn)])
+    filenames = [(os.path.basename(filename).lower(), i, filename) for i, filename in enumerate(filenames)]
+    filenames.sort()
+    filenames = [filename for basename, i, filename in filenames]
+    if not filenames:
+        filename = 'pip'
+    else:
+        filename = filenames[-1]
+    easy_install_script = 'easy_install'
+    if sys.platform == 'win32':
+        easy_install_script = 'easy_install-script.py'
+    cmd = [join(os.path.dirname(py_executable), easy_install_script), filename]
+    if sys.platform == 'win32':
+        cmd.insert(0, py_executable)
+    if filename == 'pip':
+        if never_download:
+            logger.fatal("Can't find any local distributions of pip to install "
+                         "and --never-download is set.  Either re-run virtualenv "
+                         "without the --never-download option, or place a pip "
+                         "source distribution (zip/tar.gz/tar.bz2) in one of these "
+                         "locations: %r" % search_dirs)
+            sys.exit(1)
+        logger.info('Installing pip from network...')
+    else:
+        logger.info('Installing existing %s distribution: %s' % (
+                os.path.basename(filename), filename))
+    logger.start_progress('Installing pip...')
+    logger.indent += 2
+    def _filter_setup(line):
+        return filter_ez_setup(line, 'pip')
+    try:
+        call_subprocess(cmd, show_stdout=False,
+                        filter_stdout=_filter_setup)
+    finally:
+        logger.indent -= 2
+        logger.end_progress()
+
+def filter_ez_setup(line, project_name='setuptools'):
+    if not line.strip():
+        return Logger.DEBUG
+    if project_name == 'distribute':
+        for prefix in ('Extracting', 'Now working', 'Installing', 'Before',
+                       'Scanning', 'Setuptools', 'Egg', 'Already',
+                       'running', 'writing', 'reading', 'installing',
+                       'creating', 'copying', 'byte-compiling', 'removing',
+                       'Processing'):
+            if line.startswith(prefix):
+                return Logger.DEBUG
+        return Logger.DEBUG
+    for prefix in ['Reading ', 'Best match', 'Processing setuptools',
+                   'Copying setuptools', 'Adding setuptools',
+                   'Installing ', 'Installed ']:
+        if line.startswith(prefix):
+            return Logger.DEBUG
+    return Logger.INFO
+
+
+class UpdatingDefaultsHelpFormatter(optparse.IndentedHelpFormatter):
+    """
+    Custom help formatter for use in ConfigOptionParser that updates
+    the defaults before expanding them, allowing them to show up correctly
+    in the help listing
+    """
+    def expand_default(self, option):
+        if self.parser is not None:
+            self.parser.update_defaults(self.parser.defaults)
+        return optparse.IndentedHelpFormatter.expand_default(self, option)
+
+
+class ConfigOptionParser(optparse.OptionParser):
+    """
+    Custom option parser which updates its defaults by by checking the
+    configuration files and environmental variables
+    """
+    def __init__(self, *args, **kwargs):
+        self.config = ConfigParser.RawConfigParser()
+        self.files = self.get_config_files()
+        self.config.read(self.files)
+        optparse.OptionParser.__init__(self, *args, **kwargs)
+
+    def get_config_files(self):
+        config_file = os.environ.get('VIRTUALENV_CONFIG_FILE', False)
+        if config_file and os.path.exists(config_file):
+            return [config_file]
+        return [default_config_file]
+
+    def update_defaults(self, defaults):
+        """
+        Updates the given defaults with values from the config files and
+        the environ. Does a little special handling for certain types of
+        options (lists).
+        """
+        # Then go and look for the other sources of configuration:
+        config = {}
+        # 1. config files
+        config.update(dict(self.get_config_section('virtualenv')))
+        # 2. environmental variables
+        config.update(dict(self.get_environ_vars()))
+        # Then set the options with those values
+        for key, val in config.items():
+            key = key.replace('_', '-')
+            if not key.startswith('--'):
+                key = '--%s' % key  # only prefer long opts
+            option = self.get_option(key)
+            if option is not None:
+                # ignore empty values
+                if not val:
+                    continue
+                # handle multiline configs
+                if option.action == 'append':
+                    val = val.split()
+                else:
+                    option.nargs = 1
+                if option.action in ('store_true', 'store_false', 'count'):
+                    val = strtobool(val)
+                try:
+                    val = option.convert_value(key, val)
+                except optparse.OptionValueError:
+                    e = sys.exc_info()[1]
+                    print("An error occured during configuration: %s" % e)
+                    sys.exit(3)
+                defaults[option.dest] = val
+        return defaults
+
+    def get_config_section(self, name):
+        """
+        Get a section of a configuration
+        """
+        if self.config.has_section(name):
+            return self.config.items(name)
+        return []
+
+    def get_environ_vars(self, prefix='VIRTUALENV_'):
+        """
+        Returns a generator with all environmental vars with prefix VIRTUALENV
+        """
+        for key, val in os.environ.items():
+            if key.startswith(prefix):
+                yield (key.replace(prefix, '').lower(), val)
+
+    def get_default_values(self):
+        """
+        Overridding to make updating the defaults after instantiation of
+        the option parser possible, update_defaults() does the dirty work.
+        """
+        if not self.process_default_values:
+            # Old, pre-Optik 1.5 behaviour.
+            return optparse.Values(self.defaults)
+
+        defaults = self.update_defaults(self.defaults.copy()) # ours
+        for option in self._get_all_options():
+            default = defaults.get(option.dest)
+            if isinstance(default, basestring):
+                opt_str = option.get_opt_string()
+                defaults[option.dest] = option.check_value(opt_str, default)
+        return optparse.Values(defaults)
+
+
+def main():
+    parser = ConfigOptionParser(
+        version=virtualenv_version,
+        usage="%prog [OPTIONS] DEST_DIR",
+        formatter=UpdatingDefaultsHelpFormatter())
+
+    parser.add_option(
+        '-v', '--verbose',
+        action='count',
+        dest='verbose',
+        default=0,
+        help="Increase verbosity")
+
+    parser.add_option(
+        '-q', '--quiet',
+        action='count',
+        dest='quiet',
+        default=0,
+        help='Decrease verbosity')
+
+    parser.add_option(
+        '-p', '--python',
+        dest='python',
+        metavar='PYTHON_EXE',
+        help='The Python interpreter to use, e.g., --python=python2.5 will use the python2.5 '
+        'interpreter to create the new environment.  The default is the interpreter that '
+        'virtualenv was installed with (%s)' % sys.executable)
+
+    parser.add_option(
+        '--clear',
+        dest='clear',
+        action='store_true',
+        help="Clear out the non-root install and start from scratch")
+
+    parser.add_option(
+        '--no-site-packages',
+        dest='no_site_packages',
+        action='store_true',
+        help="Don't give access to the global site-packages dir to the "
+             "virtual environment")
+
+    parser.add_option(
+        '--system-site-packages',
+        dest='system_site_packages',
+        action='store_true',
+        help="Give access to the global site-packages dir to the "
+             "virtual environment")
+
+    parser.add_option(
+        '--unzip-setuptools',
+        dest='unzip_setuptools',
+        action='store_true',
+        help="Unzip Setuptools or Distribute when installing it")
+
+    parser.add_option(
+        '--relocatable',
+        dest='relocatable',
+        action='store_true',
+        help='Make an EXISTING virtualenv environment relocatable.  '
+        'This fixes up scripts and makes all .pth files relative')
+
+    parser.add_option(
+        '--distribute',
+        dest='use_distribute',
+        action='store_true',
+        help='Use Distribute instead of Setuptools. Set environ variable '
+        'VIRTUALENV_DISTRIBUTE to make it the default ')
+
+    default_search_dirs = file_search_dirs()
+    parser.add_option(
+        '--extra-search-dir',
+        dest="search_dirs",
+        action="append",
+        default=default_search_dirs,
+        help="Directory to look for setuptools/distribute/pip distributions in. "
+        "You can add any number of additional --extra-search-dir paths.")
+
+    parser.add_option(
+        '--never-download',
+        dest="never_download",
+        action="store_true",
+        help="Never download anything from the network.  Instead, virtualenv will fail "
+        "if local distributions of setuptools/distribute/pip are not present.")
+
+    parser.add_option(
+        '--prompt=',
+        dest='prompt',
+        help='Provides an alternative prompt prefix for this environment')
+
+    if 'extend_parser' in globals():
+        extend_parser(parser)
+
+    options, args = parser.parse_args()
+
+    global logger
+
+    if 'adjust_options' in globals():
+        adjust_options(options, args)
+
+    verbosity = options.verbose - options.quiet
+    logger = Logger([(Logger.level_for_integer(2-verbosity), sys.stdout)])
+
+    if options.python and not os.environ.get('VIRTUALENV_INTERPRETER_RUNNING'):
+        env = os.environ.copy()
+        interpreter = resolve_interpreter(options.python)
+        if interpreter == sys.executable:
+            logger.warn('Already using interpreter %s' % interpreter)
+        else:
+            logger.notify('Running virtualenv with interpreter %s' % interpreter)
+            env['VIRTUALENV_INTERPRETER_RUNNING'] = 'true'
+            file = __file__
+            if file.endswith('.pyc'):
+                file = file[:-1]
+            popen = subprocess.Popen([interpreter, file] + sys.argv[1:], env=env)
+            raise SystemExit(popen.wait())
+
+    # Force --distribute on Python 3, since setuptools is not available.
+    if majver > 2:
+        options.use_distribute = True
+
+    if os.environ.get('PYTHONDONTWRITEBYTECODE') and not options.use_distribute:
+        print(
+            "The PYTHONDONTWRITEBYTECODE environment variable is "
+            "not compatible with setuptools. Either use --distribute "
+            "or unset PYTHONDONTWRITEBYTECODE.")
+        sys.exit(2)
+    if not args:
+        print('You must provide a DEST_DIR')
+        parser.print_help()
+        sys.exit(2)
+    if len(args) > 1:
+        print('There must be only one argument: DEST_DIR (you gave %s)' % (
+            ' '.join(args)))
+        parser.print_help()
+        sys.exit(2)
+
+    home_dir = args[0]
+
+    if os.environ.get('WORKING_ENV'):
+        logger.fatal('ERROR: you cannot run virtualenv while in a workingenv')
+        logger.fatal('Please deactivate your workingenv, then re-run this script')
+        sys.exit(3)
+
+    if 'PYTHONHOME' in os.environ:
+        logger.warn('PYTHONHOME is set.  You *must* activate the virtualenv before using it')
+        del os.environ['PYTHONHOME']
+
+    if options.relocatable:
+        make_environment_relocatable(home_dir)
+        return
+
+    if options.no_site_packages:
+        logger.warn('The --no-site-packages flag is deprecated; it is now '
+                    'the default behavior.')
+
+    create_environment(home_dir,
+                       site_packages=options.system_site_packages,
+                       clear=options.clear,
+                       unzip_setuptools=options.unzip_setuptools,
+                       use_distribute=options.use_distribute,
+                       prompt=options.prompt,
+                       search_dirs=options.search_dirs,
+                       never_download=options.never_download)
+    if 'after_install' in globals():
+        after_install(options, home_dir)
+
+def call_subprocess(cmd, show_stdout=True,
+                    filter_stdout=None, cwd=None,
+                    raise_on_returncode=True, extra_env=None,
+                    remove_from_env=None):
+    cmd_parts = []
+    for part in cmd:
+        if len(part) > 45:
+            part = part[:20]+"..."+part[-20:]
+        if ' ' in part or '\n' in part or '"' in part or "'" in part:
+            part = '"%s"' % part.replace('"', '\\"')
+        if hasattr(part, 'decode'):
+            try:
+                part = part.decode(sys.getdefaultencoding())
+            except UnicodeDecodeError:
+                part = part.decode(sys.getfilesystemencoding())
+        cmd_parts.append(part)
+    cmd_desc = ' '.join(cmd_parts)
+    if show_stdout:
+        stdout = None
+    else:
+        stdout = subprocess.PIPE
+    logger.debug("Running command %s" % cmd_desc)
+    if extra_env or remove_from_env:
+        env = os.environ.copy()
+        if extra_env:
+            env.update(extra_env)
+        if remove_from_env:
+            for varname in remove_from_env:
+                env.pop(varname, None)
+    else:
+        env = None
+    try:
+        proc = subprocess.Popen(
+            cmd, stderr=subprocess.STDOUT, stdin=None, stdout=stdout,
+            cwd=cwd, env=env)
+    except Exception:
+        e = sys.exc_info()[1]
+        logger.fatal(
+            "Error %s while executing command %s" % (e, cmd_desc))
+        raise
+    all_output = []
+    if stdout is not None:
+        stdout = proc.stdout
+        encoding = sys.getdefaultencoding()
+        fs_encoding = sys.getfilesystemencoding()
+        while 1:
+            line = stdout.readline()
+            try:
+                line = line.decode(encoding)
+            except UnicodeDecodeError:
+                line = line.decode(fs_encoding)
+            if not line:
+                break
+            line = line.rstrip()
+            all_output.append(line)
+            if filter_stdout:
+                level = filter_stdout(line)
+                if isinstance(level, tuple):
+                    level, line = level
+                logger.log(level, line)
+                if not logger.stdout_level_matches(level):
+                    logger.show_progress()
+            else:
+                logger.info(line)
+    else:
+        proc.communicate()
+    proc.wait()
+    if proc.returncode:
+        if raise_on_returncode:
+            if all_output:
+                logger.notify('Complete output from command %s:' % cmd_desc)
+                logger.notify('\n'.join(all_output) + '\n----------------------------------------')
+            raise OSError(
+                "Command %s failed with error code %s"
+                % (cmd_desc, proc.returncode))
+        else:
+            logger.warn(
+                "Command %s had error code %s"
+                % (cmd_desc, proc.returncode))
+
+
+def create_environment(home_dir, site_packages=False, clear=False,
+                       unzip_setuptools=False, use_distribute=False,
+                       prompt=None, search_dirs=None, never_download=False):
+    """
+    Creates a new environment in ``home_dir``.
+
+    If ``site_packages`` is true, then the global ``site-packages/``
+    directory will be on the path.
+
+    If ``clear`` is true (default False) then the environment will
+    first be cleared.
+    """
+    home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
+
+    py_executable = os.path.abspath(install_python(
+        home_dir, lib_dir, inc_dir, bin_dir,
+        site_packages=site_packages, clear=clear))
+
+    install_distutils(home_dir)
+
+    # use_distribute also is True if VIRTUALENV_DISTRIBUTE env var is set
+    # we also check VIRTUALENV_USE_DISTRIBUTE for backwards compatibility
+    if use_distribute or os.environ.get('VIRTUALENV_USE_DISTRIBUTE'):
+        install_distribute(py_executable, unzip=unzip_setuptools,
+                           search_dirs=search_dirs, never_download=never_download)
+    else:
+        install_setuptools(py_executable, unzip=unzip_setuptools,
+                           search_dirs=search_dirs, never_download=never_download)
+
+    install_pip(py_executable, search_dirs=search_dirs, never_download=never_download)
+
+    install_activate(home_dir, bin_dir, prompt)
+
+def path_locations(home_dir):
+    """Return the path locations for the environment (where libraries are,
+    where scripts go, etc)"""
+    # XXX: We'd use distutils.sysconfig.get_python_inc/lib but its
+    # prefix arg is broken: http://bugs.python.org/issue3386
+    if sys.platform == 'win32':
+        # Windows has lots of problems with executables with spaces in
+        # the name; this function will remove them (using the ~1
+        # format):
+        mkdir(home_dir)
+        if ' ' in home_dir:
+            try:
+                import win32api
+            except ImportError:
+                print('Error: the path "%s" has a space in it' % home_dir)
+                print('To handle these kinds of paths, the win32api module must be installed:')
+                print('  http://sourceforge.net/projects/pywin32/')
+                sys.exit(3)
+            home_dir = win32api.GetShortPathName(home_dir)
+        lib_dir = join(home_dir, 'Lib')
+        inc_dir = join(home_dir, 'Include')
+        bin_dir = join(home_dir, 'Scripts')
+    elif is_jython:
+        lib_dir = join(home_dir, 'Lib')
+        inc_dir = join(home_dir, 'Include')
+        bin_dir = join(home_dir, 'bin')
+    elif is_pypy:
+        lib_dir = home_dir
+        inc_dir = join(home_dir, 'include')
+        bin_dir = join(home_dir, 'bin')
+    else:
+        lib_dir = join(home_dir, 'lib', py_version)
+        inc_dir = join(home_dir, 'include', py_version + abiflags)
+        bin_dir = join(home_dir, 'bin')
+    return home_dir, lib_dir, inc_dir, bin_dir
+
+
+def change_prefix(filename, dst_prefix):
+    prefixes = [sys.prefix]
+
+    if sys.platform == "darwin":
+        prefixes.extend((
+            os.path.join("/Library/Python", sys.version[:3], "site-packages"),
+            os.path.join(sys.prefix, "Extras", "lib", "python"),
+            os.path.join("~", "Library", "Python", sys.version[:3], "site-packages")))
+
+    if hasattr(sys, 'real_prefix'):
+        prefixes.append(sys.real_prefix)
+    prefixes = list(map(os.path.abspath, prefixes))
+    filename = os.path.abspath(filename)
+    for src_prefix in prefixes:
+        if filename.startswith(src_prefix):
+            _, relpath = filename.split(src_prefix, 1)
+            assert relpath[0] == os.sep
+            relpath = relpath[1:]
+            return join(dst_prefix, relpath)
+    assert False, "Filename %s does not start with any of these prefixes: %s" % \
+        (filename, prefixes)
+
+def copy_required_modules(dst_prefix):
+    import imp
+    # If we are running under -p, we need to remove the current
+    # directory from sys.path temporarily here, so that we
+    # definitely get the modules from the site directory of
+    # the interpreter we are running under, not the one
+    # virtualenv.py is installed under (which might lead to py2/py3
+    # incompatibility issues)
+    _prev_sys_path = sys.path
+    if os.environ.get('VIRTUALENV_INTERPRETER_RUNNING'):
+        sys.path = sys.path[1:]
+    try:
+        for modname in REQUIRED_MODULES:
+            if modname in sys.builtin_module_names:
+                logger.info("Ignoring built-in bootstrap module: %s" % modname)
+                continue
+            try:
+                f, filename, _ = imp.find_module(modname)
+            except ImportError:
+                logger.info("Cannot import bootstrap module: %s" % modname)
+            else:
+                if f is not None:
+                    f.close()
+                dst_filename = change_prefix(filename, dst_prefix)
+                copyfile(filename, dst_filename)
+                if filename.endswith('.pyc'):
+                    pyfile = filename[:-1]
+                    if os.path.exists(pyfile):
+                        copyfile(pyfile, dst_filename[:-1])
+    finally:
+        sys.path = _prev_sys_path
+
+def install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages, clear):
+    """Install just the base environment, no distutils patches etc"""
+    if sys.executable.startswith(bin_dir):
+        print('Please use the *system* python to run this script')
+        return
+
+    if clear:
+        rmtree(lib_dir)
+        ## FIXME: why not delete it?
+        ## Maybe it should delete everything with #!/path/to/venv/python in it
+        logger.notify('Not deleting %s', bin_dir)
+
+    if hasattr(sys, 'real_prefix'):
+        logger.notify('Using real prefix %r' % sys.real_prefix)
+        prefix = sys.real_prefix
+    else:
+        prefix = sys.prefix
+    mkdir(lib_dir)
+    fix_lib64(lib_dir)
+    stdlib_dirs = [os.path.dirname(os.__file__)]
+    if sys.platform == 'win32':
+        stdlib_dirs.append(join(os.path.dirname(stdlib_dirs[0]), 'DLLs'))
+    elif sys.platform == 'darwin':
+        stdlib_dirs.append(join(stdlib_dirs[0], 'site-packages'))
+    if hasattr(os, 'symlink'):
+        logger.info('Symlinking Python bootstrap modules')
+    else:
+        logger.info('Copying Python bootstrap modules')
+    logger.indent += 2
+    try:
+        # copy required files...
+        for stdlib_dir in stdlib_dirs:
+            if not os.path.isdir(stdlib_dir):
+                continue
+            for fn in os.listdir(stdlib_dir):
+                bn = os.path.splitext(fn)[0]
+                if fn != 'site-packages' and bn in REQUIRED_FILES:
+                    copyfile(join(stdlib_dir, fn), join(lib_dir, fn))
+        # ...and modules
+        copy_required_modules(home_dir)
+    finally:
+        logger.indent -= 2
+    mkdir(join(lib_dir, 'site-packages'))
+    import site
+    site_filename = site.__file__
+    if site_filename.endswith('.pyc'):
+        site_filename = site_filename[:-1]
+    elif site_filename.endswith('$py.class'):
+        site_filename = site_filename.replace('$py.class', '.py')
+    site_filename_dst = change_prefix(site_filename, home_dir)
+    site_dir = os.path.dirname(site_filename_dst)
+    writefile(site_filename_dst, SITE_PY)
+    writefile(join(site_dir, 'orig-prefix.txt'), prefix)
+    site_packages_filename = join(site_dir, 'no-global-site-packages.txt')
+    if not site_packages:
+        writefile(site_packages_filename, '')
+    else:
+        if os.path.exists(site_packages_filename):
+            logger.info('Deleting %s' % site_packages_filename)
+            os.unlink(site_packages_filename)
+
+    if is_pypy or is_win:
+        stdinc_dir = join(prefix, 'include')
+    else:
+        stdinc_dir = join(prefix, 'include', py_version + abiflags)
+    if os.path.exists(stdinc_dir):
+        copyfile(stdinc_dir, inc_dir)
+    else:
+        logger.debug('No include dir %s' % stdinc_dir)
+
+    # pypy never uses exec_prefix, just ignore it
+    if sys.exec_prefix != prefix and not is_pypy:
+        if sys.platform == 'win32':
+            exec_dir = join(sys.exec_prefix, 'lib')
+        elif is_jython:
+            exec_dir = join(sys.exec_prefix, 'Lib')
+        else:
+            exec_dir = join(sys.exec_prefix, 'lib', py_version)
+        for fn in os.listdir(exec_dir):
+            copyfile(join(exec_dir, fn), join(lib_dir, fn))
+
+    if is_jython:
+        # Jython has either jython-dev.jar and javalib/ dir, or just
+        # jython.jar
+        for name in 'jython-dev.jar', 'javalib', 'jython.jar':
+            src = join(prefix, name)
+            if os.path.exists(src):
+                copyfile(src, join(home_dir, name))
+        # XXX: registry should always exist after Jython 2.5rc1
+        src = join(prefix, 'registry')
+        if os.path.exists(src):
+            copyfile(src, join(home_dir, 'registry'), symlink=False)
+        copyfile(join(prefix, 'cachedir'), join(home_dir, 'cachedir'),
+                 symlink=False)
+
+    mkdir(bin_dir)
+    py_executable = join(bin_dir, os.path.basename(sys.executable))
+    if 'Python.framework' in prefix:
+        if re.search(r'/Python(?:-32|-64)*$', py_executable):
+            # The name of the python executable is not quite what
+            # we want, rename it.
+            py_executable = os.path.join(
+                    os.path.dirname(py_executable), 'python')
+
+    logger.notify('New %s executable in %s', expected_exe, py_executable)
+    pcbuild_dir = os.path.dirname(sys.executable)
+    pyd_pth = os.path.join(lib_dir, 'site-packages', 'virtualenv_builddir_pyd.pth')
+    if is_win and os.path.exists(os.path.join(pcbuild_dir, 'build.bat')):
+        logger.notify('Detected python running from build directory %s', pcbuild_dir)
+        logger.notify('Writing .pth file linking to build directory for *.pyd files')
+        writefile(pyd_pth, pcbuild_dir)
+    else:
+        pcbuild_dir = None
+        if os.path.exists(pyd_pth):
+            logger.info('Deleting %s (not Windows env or not build directory python)' % pyd_pth)
+            os.unlink(pyd_pth)
+        
+    if sys.executable != py_executable:
+        ## FIXME: could I just hard link?
+        executable = sys.executable
+        if sys.platform == 'cygwin' and os.path.exists(executable + '.exe'):
+            # Cygwin misreports sys.executable sometimes
+            executable += '.exe'
+            py_executable += '.exe'
+            logger.info('Executable actually exists in %s' % executable)
+        shutil.copyfile(executable, py_executable)
+        make_exe(py_executable)
+        if sys.platform == 'win32' or sys.platform == 'cygwin':
+            pythonw = os.path.join(os.path.dirname(sys.executable), 'pythonw.exe')
+            if os.path.exists(pythonw):
+                logger.info('Also created pythonw.exe')
+                shutil.copyfile(pythonw, os.path.join(os.path.dirname(py_executable), 'pythonw.exe'))
+            python_d = os.path.join(os.path.dirname(sys.executable), 'python_d.exe')
+            python_d_dest = os.path.join(os.path.dirname(py_executable), 'python_d.exe')
+            if os.path.exists(python_d):
+                logger.info('Also created python_d.exe')
+                shutil.copyfile(python_d, python_d_dest)
+            elif os.path.exists(python_d_dest):
+                logger.info('Removed python_d.exe as it is no longer at the source')
+                os.unlink(python_d_dest)
+            # we need to copy the DLL to enforce that windows will load the correct one.
+            # may not exist if we are cygwin.
+            py_executable_dll = 'python%s%s.dll' % (
+                sys.version_info[0], sys.version_info[1])
+            py_executable_dll_d = 'python%s%s_d.dll' % (
+                sys.version_info[0], sys.version_info[1])
+            pythondll = os.path.join(os.path.dirname(sys.executable), py_executable_dll)
+            pythondll_d = os.path.join(os.path.dirname(sys.executable), py_executable_dll_d)
+            pythondll_d_dest = os.path.join(os.path.dirname(py_executable), py_executable_dll_d)
+            if os.path.exists(pythondll):
+                logger.info('Also created %s' % py_executable_dll)
+                shutil.copyfile(pythondll, os.path.join(os.path.dirname(py_executable), py_executable_dll))
+            if os.path.exists(pythondll_d):
+                logger.info('Also created %s' % py_executable_dll_d)
+                shutil.copyfile(pythondll_d, pythondll_d_dest)
+            elif os.path.exists(pythondll_d_dest):
+                logger.info('Removed %s as the source does not exist' % pythondll_d_dest)
+                os.unlink(pythondll_d_dest)
+        if is_pypy:
+            # make a symlink python --> pypy-c
+            python_executable = os.path.join(os.path.dirname(py_executable), 'python')
+            logger.info('Also created executable %s' % python_executable)
+            copyfile(py_executable, python_executable)
+
+    if os.path.splitext(os.path.basename(py_executable))[0] != expected_exe:
+        secondary_exe = os.path.join(os.path.dirname(py_executable),
+                                     expected_exe)
+        py_executable_ext = os.path.splitext(py_executable)[1]
+        if py_executable_ext == '.exe':
+            # python2.4 gives an extension of '.4' :P
+            secondary_exe += py_executable_ext
+        if os.path.exists(secondary_exe):
+            logger.warn('Not overwriting existing %s script %s (you must use %s)'
+                        % (expected_exe, secondary_exe, py_executable))
+        else:
+            logger.notify('Also creating executable in %s' % secondary_exe)
+            shutil.copyfile(sys.executable, secondary_exe)
+            make_exe(secondary_exe)
+
+    if '.framework' in prefix:
+        if 'Python.framework' in prefix:
+            logger.debug('MacOSX Python framework detected')
+            # Make sure we use the the embedded interpreter inside
+            # the framework, even if sys.executable points to
+            # the stub executable in ${sys.prefix}/bin
+            # See http://groups.google.com/group/python-virtualenv/
+            #                              browse_thread/thread/17cab2f85da75951
+            original_python = os.path.join(
+                prefix, 'Resources/Python.app/Contents/MacOS/Python')
+        if 'EPD' in prefix:
+            logger.debug('EPD framework detected')
+            original_python = os.path.join(prefix, 'bin/python')
+        shutil.copy(original_python, py_executable)
+
+        # Copy the framework's dylib into the virtual
+        # environment
+        virtual_lib = os.path.join(home_dir, '.Python')
+
+        if os.path.exists(virtual_lib):
+            os.unlink(virtual_lib)
+        copyfile(
+            os.path.join(prefix, 'Python'),
+            virtual_lib)
+
+        # And then change the install_name of the copied python executable
+        try:
+            call_subprocess(
+                ["install_name_tool", "-change",
+                 os.path.join(prefix, 'Python'),
+                 '@executable_path/../.Python',
+                 py_executable])
+        except:
+            logger.fatal(
+                "Could not call install_name_tool -- you must have Apple's development tools installed")
+            raise
+
+        # Some tools depend on pythonX.Y being present
+        py_executable_version = '%s.%s' % (
+            sys.version_info[0], sys.version_info[1])
+        if not py_executable.endswith(py_executable_version):
+            # symlinking pythonX.Y > python
+            pth = py_executable + '%s.%s' % (
+                    sys.version_info[0], sys.version_info[1])
+            if os.path.exists(pth):
+                os.unlink(pth)
+            os.symlink('python', pth)
+        else:
+            # reverse symlinking python -> pythonX.Y (with --python)
+            pth = join(bin_dir, 'python')
+            if os.path.exists(pth):
+                os.unlink(pth)
+            os.symlink(os.path.basename(py_executable), pth)
+
+    if sys.platform == 'win32' and ' ' in py_executable:
+        # There's a bug with subprocess on Windows when using a first
+        # argument that has a space in it.  Instead we have to quote
+        # the value:
+        py_executable = '"%s"' % py_executable
+    cmd = [py_executable, '-c', """
+import sys
+prefix = sys.prefix
+if sys.version_info[0] == 3:
+    prefix = prefix.encode('utf8')
+if hasattr(sys.stdout, 'detach'):
+    sys.stdout = sys.stdout.detach()
+elif hasattr(sys.stdout, 'buffer'):
+    sys.stdout = sys.stdout.buffer
+sys.stdout.write(prefix)
+"""]
+    logger.info('Testing executable with %s %s "%s"' % tuple(cmd))
+    try:
+        proc = subprocess.Popen(cmd,
+                            stdout=subprocess.PIPE)
+        proc_stdout, proc_stderr = proc.communicate()
+    except OSError:
+        e = sys.exc_info()[1]
+        if e.errno == errno.EACCES:
+            logger.fatal('ERROR: The executable %s could not be run: %s' % (py_executable, e))
+            sys.exit(100)
+        else:
+          raise e
+
+    proc_stdout = proc_stdout.strip().decode("utf-8")
+    proc_stdout = os.path.normcase(os.path.abspath(proc_stdout))
+    norm_home_dir = os.path.normcase(os.path.abspath(home_dir))
+    if hasattr(norm_home_dir, 'decode'):
+        norm_home_dir = norm_home_dir.decode(sys.getfilesystemencoding())
+    if proc_stdout != norm_home_dir:
+        logger.fatal(
+            'ERROR: The executable %s is not functioning' % py_executable)
+        logger.fatal(
+            'ERROR: It thinks sys.prefix is %r (should be %r)'
+            % (proc_stdout, norm_home_dir))
+        logger.fatal(
+            'ERROR: virtualenv is not compatible with this system or executable')
+        if sys.platform == 'win32':
+            logger.fatal(
+                'Note: some Windows users have reported this error when they '
+                'installed Python for "Only this user" or have multiple '
+                'versions of Python installed. Copying the appropriate '
+                'PythonXX.dll to the virtualenv Scripts/ directory may fix '
+                'this problem.')
+        sys.exit(100)
+    else:
+        logger.info('Got sys.prefix result: %r' % proc_stdout)
+
+    pydistutils = os.path.expanduser('~/.pydistutils.cfg')
+    if os.path.exists(pydistutils):
+        logger.notify('Please make sure you remove any previous custom paths from '
+                      'your %s file.' % pydistutils)
+    ## FIXME: really this should be calculated earlier
+
+    fix_local_scheme(home_dir)
+
+    return py_executable
+
+def install_activate(home_dir, bin_dir, prompt=None):
+    home_dir = os.path.abspath(home_dir)
+    if sys.platform == 'win32' or is_jython and os._name == 'nt':
+        files = {
+            'activate.bat': ACTIVATE_BAT,
+            'deactivate.bat': DEACTIVATE_BAT,
+            'activate.ps1': ACTIVATE_PS,
+        }
+
+        # MSYS needs paths of the form /c/path/to/file
+        drive, tail = os.path.splitdrive(home_dir.replace(os.sep, '/'))
+        home_dir_msys = (drive and "/%s%s" or "%s%s") % (drive[:1], tail)
+
+        # Run-time conditional enables (basic) Cygwin compatibility
+        home_dir_sh = ("""$(if [ "$OSTYPE" "==" "cygwin" ]; then cygpath -u '%s'; else echo '%s'; fi;)""" % 
+                       (home_dir, home_dir_msys))
+        files['activate'] = ACTIVATE_SH.replace('__VIRTUAL_ENV__', home_dir_sh)
+
+    else:
+        files = {'activate': ACTIVATE_SH}
+
+        # suppling activate.fish in addition to, not instead of, the
+        # bash script support.
+        files['activate.fish'] = ACTIVATE_FISH
+
+        # same for csh/tcsh support...
+        files['activate.csh'] = ACTIVATE_CSH
+
+    files['activate_this.py'] = ACTIVATE_THIS
+    if hasattr(home_dir, 'decode'):
+        home_dir = home_dir.decode(sys.getfilesystemencoding())
+    vname = os.path.basename(home_dir)
+    for name, content in files.items():
+        content = content.replace('__VIRTUAL_PROMPT__', prompt or '')
+        content = content.replace('__VIRTUAL_WINPROMPT__', prompt or '(%s)' % vname)
+        content = content.replace('__VIRTUAL_ENV__', home_dir)
+        content = content.replace('__VIRTUAL_NAME__', vname)
+        content = content.replace('__BIN_NAME__', os.path.basename(bin_dir))
+        writefile(os.path.join(bin_dir, name), content)
+
+def install_distutils(home_dir):
+    distutils_path = change_prefix(distutils.__path__[0], home_dir)
+    mkdir(distutils_path)
+    ## FIXME: maybe this prefix setting should only be put in place if
+    ## there's a local distutils.cfg with a prefix setting?
+    home_dir = os.path.abspath(home_dir)
+    ## FIXME: this is breaking things, removing for now:
+    #distutils_cfg = DISTUTILS_CFG + "\n[install]\nprefix=%s\n" % home_dir
+    writefile(os.path.join(distutils_path, '__init__.py'), DISTUTILS_INIT)
+    writefile(os.path.join(distutils_path, 'distutils.cfg'), DISTUTILS_CFG, overwrite=False)
+
+def fix_local_scheme(home_dir):
+    """
+    Platforms that use the "posix_local" install scheme (like Ubuntu with
+    Python 2.7) need to be given an additional "local" location, sigh.
+    """
+    try:
+        import sysconfig
+    except ImportError:
+        pass
+    else:
+        if sysconfig._get_default_scheme() == 'posix_local':
+            local_path = os.path.join(home_dir, 'local')
+            if not os.path.exists(local_path):
+                os.mkdir(local_path)
+                for subdir_name in os.listdir(home_dir):
+                    if subdir_name == 'local':
+                        continue
+                    os.symlink(os.path.abspath(os.path.join(home_dir, subdir_name)), \
+                                                            os.path.join(local_path, subdir_name))
+
+def fix_lib64(lib_dir):
+    """
+    Some platforms (particularly Gentoo on x64) put things in lib64/pythonX.Y
+    instead of lib/pythonX.Y.  If this is such a platform we'll just create a
+    symlink so lib64 points to lib
+    """
+    if [p for p in distutils.sysconfig.get_config_vars().values()
+        if isinstance(p, basestring) and 'lib64' in p]:
+        logger.debug('This system uses lib64; symlinking lib64 to lib')
+        assert os.path.basename(lib_dir) == 'python%s' % sys.version[:3], (
+            "Unexpected python lib dir: %r" % lib_dir)
+        lib_parent = os.path.dirname(lib_dir)
+        assert os.path.basename(lib_parent) == 'lib', (
+            "Unexpected parent dir: %r" % lib_parent)
+        copyfile(lib_parent, os.path.join(os.path.dirname(lib_parent), 'lib64'))
+
+def resolve_interpreter(exe):
+    """
+    If the executable given isn't an absolute path, search $PATH for the interpreter
+    """
+    if os.path.abspath(exe) != exe:
+        paths = os.environ.get('PATH', '').split(os.pathsep)
+        for path in paths:
+            if os.path.exists(os.path.join(path, exe)):
+                exe = os.path.join(path, exe)
+                break
+    if not os.path.exists(exe):
+        logger.fatal('The executable %s (from --python=%s) does not exist' % (exe, exe))
+        raise SystemExit(3)
+    if not is_executable(exe):
+        logger.fatal('The executable %s (from --python=%s) is not executable' % (exe, exe))
+        raise SystemExit(3)
+    return exe
+
+def is_executable(exe):
+    """Checks a file is executable"""
+    return os.access(exe, os.X_OK)
+
+############################################################
+## Relocating the environment:
+
+def make_environment_relocatable(home_dir):
+    """
+    Makes the already-existing environment use relative paths, and takes out
+    the #!-based environment selection in scripts.
+    """
+    home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
+    activate_this = os.path.join(bin_dir, 'activate_this.py')
+    if not os.path.exists(activate_this):
+        logger.fatal(
+            'The environment doesn\'t have a file %s -- please re-run virtualenv '
+            'on this environment to update it' % activate_this)
+    fixup_scripts(home_dir)
+    fixup_pth_and_egg_link(home_dir)
+    ## FIXME: need to fix up distutils.cfg
+
+OK_ABS_SCRIPTS = ['python', 'python%s' % sys.version[:3],
+                  'activate', 'activate.bat', 'activate_this.py']
+
+def fixup_scripts(home_dir):
+    # This is what we expect at the top of scripts:
+    shebang = '#!%s/bin/python' % os.path.normcase(os.path.abspath(home_dir))
+    # This is what we'll put:
+    new_shebang = '#!/usr/bin/env python%s' % sys.version[:3]
+    activate = "import os; activate_this=os.path.join(os.path.dirname(os.path.realpath(__file__)), 'activate_this.py'); execfile(activate_this, dict(__file__=activate_this)); del os, activate_this"
+    if sys.platform == 'win32':
+        bin_suffix = 'Scripts'
+    else:
+        bin_suffix = 'bin'
+    bin_dir = os.path.join(home_dir, bin_suffix)
+    home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
+    for filename in os.listdir(bin_dir):
+        filename = os.path.join(bin_dir, filename)
+        if not os.path.isfile(filename):
+            # ignore subdirs, e.g. .svn ones.
+            continue
+        f = open(filename, 'rb')
+        try:
+            try:
+                lines = f.read().decode('utf-8').splitlines()
+            except UnicodeDecodeError:
+                # This is probably a binary program instead
+                # of a script, so just ignore it.
+                continue
+        finally:
+            f.close()
+        if not lines:
+            logger.warn('Script %s is an empty file' % filename)
+            continue
+        if not lines[0].strip().startswith(shebang):
+            if os.path.basename(filename) in OK_ABS_SCRIPTS:
+                logger.debug('Cannot make script %s relative' % filename)
+            elif lines[0].strip() == new_shebang:
+                logger.info('Script %s has already been made relative' % filename)
+            else:
+                logger.warn('Script %s cannot be made relative (it\'s not a normal script that starts with %s)'
+                            % (filename, shebang))
+            continue
+        logger.notify('Making script %s relative' % filename)
+        lines = [new_shebang+'\n', activate+'\n'] + lines[1:]
+        f = open(filename, 'wb')
+        f.write('\n'.join(lines).encode('utf-8'))
+        f.close()
+
+def fixup_pth_and_egg_link(home_dir, sys_path=None):
+    """Makes .pth and .egg-link files use relative paths"""
+    home_dir = os.path.normcase(os.path.abspath(home_dir))
+    if sys_path is None:
+        sys_path = sys.path
+    for path in sys_path:
+        if not path:
+            path = '.'
+        if not os.path.isdir(path):
+            continue
+        path = os.path.normcase(os.path.abspath(path))
+        if not path.startswith(home_dir):
+            logger.debug('Skipping system (non-environment) directory %s' % path)
+            continue
+        for filename in os.listdir(path):
+            filename = os.path.join(path, filename)
+            if filename.endswith('.pth'):
+                if not os.access(filename, os.W_OK):
+                    logger.warn('Cannot write .pth file %s, skipping' % filename)
+                else:
+                    fixup_pth_file(filename)
+            if filename.endswith('.egg-link'):
+                if not os.access(filename, os.W_OK):
+                    logger.warn('Cannot write .egg-link file %s, skipping' % filename)
+                else:
+                    fixup_egg_link(filename)
+
+def fixup_pth_file(filename):
+    lines = []
+    prev_lines = []
+    f = open(filename)
+    prev_lines = f.readlines()
+    f.close()
+    for line in prev_lines:
+        line = line.strip()
+        if (not line or line.startswith('#') or line.startswith('import ')
+            or os.path.abspath(line) != line):
+            lines.append(line)
+        else:
+            new_value = make_relative_path(filename, line)
+            if line != new_value:
+                logger.debug('Rewriting path %s as %s (in %s)' % (line, new_value, filename))
+            lines.append(new_value)
+    if lines == prev_lines:
+        logger.info('No changes to .pth file %s' % filename)
+        return
+    logger.notify('Making paths in .pth file %s relative' % filename)
+    f = open(filename, 'w')
+    f.write('\n'.join(lines) + '\n')
+    f.close()
+
+def fixup_egg_link(filename):
+    f = open(filename)
+    link = f.read().strip()
+    f.close()
+    if os.path.abspath(link) != link:
+        logger.debug('Link in %s already relative' % filename)
+        return
+    new_link = make_relative_path(filename, link)
+    logger.notify('Rewriting link %s in %s as %s' % (link, filename, new_link))
+    f = open(filename, 'w')
+    f.write(new_link)
+    f.close()
+
+def make_relative_path(source, dest, dest_is_directory=True):
+    """
+    Make a filename relative, where the filename is dest, and it is
+    being referred to from the filename source.
+
+        >>> make_relative_path('/usr/share/something/a-file.pth',
+        ...                    '/usr/share/another-place/src/Directory')
+        '../another-place/src/Directory'
+        >>> make_relative_path('/usr/share/something/a-file.pth',
+        ...                    '/home/user/src/Directory')
+        '../../../home/user/src/Directory'
+        >>> make_relative_path('/usr/share/a-file.pth', '/usr/share/')
+        './'
+    """
+    source = os.path.dirname(source)
+    if not dest_is_directory:
+        dest_filename = os.path.basename(dest)
+        dest = os.path.dirname(dest)
+    dest = os.path.normpath(os.path.abspath(dest))
+    source = os.path.normpath(os.path.abspath(source))
+    dest_parts = dest.strip(os.path.sep).split(os.path.sep)
+    source_parts = source.strip(os.path.sep).split(os.path.sep)
+    while dest_parts and source_parts and dest_parts[0] == source_parts[0]:
+        dest_parts.pop(0)
+        source_parts.pop(0)
+    full_parts = ['..']*len(source_parts) + dest_parts
+    if not dest_is_directory:
+        full_parts.append(dest_filename)
+    if not full_parts:
+        # Special case for the current directory (otherwise it'd be '')
+        return './'
+    return os.path.sep.join(full_parts)
+
+
+
+############################################################
+## Bootstrap script creation:
+
+def create_bootstrap_script(extra_text, python_version=''):
+    """
+    Creates a bootstrap script, which is like this script but with
+    extend_parser, adjust_options, and after_install hooks.
+
+    This returns a string that (written to disk of course) can be used
+    as a bootstrap script with your own customizations.  The script
+    will be the standard virtualenv.py script, with your extra text
+    added (your extra text should be Python code).
+
+    If you include these functions, they will be called:
+
+    ``extend_parser(optparse_parser)``:
+        You can add or remove options from the parser here.
+
+    ``adjust_options(options, args)``:
+        You can change options here, or change the args (if you accept
+        different kinds of arguments, be sure you modify ``args`` so it is
+        only ``[DEST_DIR]``).
+
+    ``after_install(options, home_dir)``:
+
+        After everything is installed, this function is called.  This
+        is probably the function you are most likely to use.  An
+        example would be::
+
+            def after_install(options, home_dir):
+                subprocess.call([join(home_dir, 'bin', 'easy_install'),
+                                 'MyPackage'])
+                subprocess.call([join(home_dir, 'bin', 'my-package-script'),
+                                 'setup', home_dir])
+
+        This example immediately installs a package, and runs a setup
+        script from that package.
+
+    If you provide something like ``python_version='2.4'`` then the
+    script will start with ``#!/usr/bin/env python2.4`` instead of
+    ``#!/usr/bin/env python``.  You can use this when the script must
+    be run with a particular Python version.
+    """
+    filename = __file__
+    if filename.endswith('.pyc'):
+        filename = filename[:-1]
+    f = open(filename, 'rb')
+    content = f.read()
+    f.close()
+    py_exe = 'python%s' % python_version
+    content = (('#!/usr/bin/env %s\n' % py_exe)
+               + '## WARNING: This file is generated\n'
+               + content)
+    return content.replace('##EXT' 'END##', extra_text)
+
+##EXTEND##
+
+def convert(s):
+    b = base64.b64decode(s.encode('ascii'))
+    return zlib.decompress(b).decode('utf-8')
+
+##file site.py
+SITE_PY = convert("""
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+""")
+
+##file ez_setup.py
+EZ_SETUP_PY = convert("""
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+dX85nKW3umfYbtu8713Sylhb2i3v2qaoc8C7S2P3pME8uIGedi1IxXbL+adi+P2fT8Xy/m+/PrxZ
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+BDaonX65d/fwEjNqlDjLVIvM9X+XVxF7
+""")
+
+##file distribute_setup.py
+DISTRIBUTE_SETUP_PY = convert("""
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+QMlQeZ1cAyjGd9cGTQ6APty0eYEWyygf0AMYm5PVpK0+YCXyhxBRFEivclbDqv898EtHmrAePepC
+S8VXAqUqBsf6HaTPC6hAI1et0Xdlmq4FccvHPwcB8T4Z9m1evvwb5S5hnIL4qGgC+k7/enpqJGPJ
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++t3p1JBtiNSVmO0ApaTetR09jBDdid1CK6CPx/2gvkizgwQ4M48pbPLqsGYQZG500QNwtRbcWi2q
+LokDU7kh8wZKZ4z3iKRzQGtbQwu8z6DR2TlJOdwAcZ2MFd7ZGLCh88UnAIYb2NkBQFUgmBb7b9x6
+lSqKkxPgfgJV8Nm4AqYbxYPq2nZPgZAF0XLtghJOlWvBN9nwwpPQ4SDlMdXc9x7bc8mvCwSXh153
+JRW44NVOQWnnd/j6v4rxw5fbgLiY7r9g8hRQRR4ESGoQqHcpie42ap6d38wm/wIwBuVg
+""")
+
+##file activate.sh
+ACTIVATE_SH = convert("""
+eJytVVFvokAQfudXTLEP2pw1fW3jg01NNGm1KV4vd22zrDDIJrhrYJHay/33m0VEKGpyufIg7s63
+M9/OfDO0YBaKBAIRISzTRMMcIU3Qh0zoEOxEpbGHMBeyxz0t1lyjDRdBrJYw50l4YbVgo1LwuJRK
+Q5xKEBp8EaOno41l+bg7Be0O/LaAnhbEmKAGFfmAci1iJZcoNax5LPg8wiRHiQBeoCvBPmfT+zv2
+PH6afR/cs8fBbGTDG9yADlHmSPOY7f4haInA95WKdQ4s91JpeDQO5fZAnKTxczaaTkbTh+EhMqWx
+QWl/rEGsNJ2kV0cRySKleRGTUKWUVB81pT+vD3Dpw0cSfoMsFF4IIV8jcHqRyVPLpTHrkOu89IUr
+EoDHo4gkoBUsiAFVlP4FKjaLFSeNFEeTS4AfJBOV6sKshVwUbmpAkyA4N8kFL+RygQlkpDfum58N
+GO1QWNLFipij/yn1twOHit5V29UvZ8Seh0/OeDo5kPz8at24lp5jRXSuDlXPuWqUjYCNejlXJwtV
+mHcUtpCddTh53hM7I15EpA+2VNLHRMep6Rn8xK0FDkYB7ABnn6J3jWnXbLvQfyzqz61dxDFGVP1a
+o1Xasx7bsipU+zZjlSVjtlUkoXofq9FHlMZtDxaLCrrH2O14wiaDhyFj1wWs2qIl773iTbZohyza
+iD0TUQQBF5HZr6ISgzKKNZrD5UpvgO5FwoT2tgkIMec+tcYm45sO+fPytqGpBy75aufpTG/gmhRb
++u3AjQtC5l1l7QV1dBAcadt+7UhFGpXONprZRviAWtbY3dgZ3N4P2ePT9OFxdjJiruJSuLk7+31f
+x60HKiWc9eH9SBc04XuPGCVYce1SXlDyJcJrjfKr7ebSNpEaQVpg+l3wiAYOJZ9GCAxoR9JMWAiv
++IyoWBSfhOIIIoRar657vSzLLj9Q0xRZX9Kk6SUq0BmPsceNl179Mi8Vii65Pkj21XXf4MAlSy/t
+Exft7A8WX4/iVRkZprZfNK2/YFL/55T+9wm9m86Uhr8A0Hwt
+""")
+
+##file activate.fish
+ACTIVATE_FISH = convert("""
+eJydVm1v4jgQ/s6vmA1wBxUE7X2stJVYlVWR2lK13d6d9laRk0yIr8HmbIe0++tvnIQQB9pbXT5A
+Ys/LM55nZtyHx5RrSHiGsMm1gRAh1xhDwU0Kng8hFzMWGb5jBv2E69SDs0TJDdj3MxilxmzPZzP7
+pVPMMl+q9bjXh1eZQ8SEkAZULoAbiLnCyGSvvV6SC7IoBcS4Nw0wjcFbvJDcjiuTswzFDpiIQaHJ
+lQAjQUi1YRmUboC2uZJig8J4PaCnT5IaDcgsbm/CjinOwgx1KcUTMEhhTgV4g2B1fRk8Le8fv86v
+g7v545UHpZB9rKnp+gXsMhxLunIIpwVQxP/l9c/Hq9Xt1epm4R27bva6AJqN92G4YhbMG2i+LB+u
+grv71c3dY7B6WtzfLy9bePbp0taDTXSwJQJszUnnp0y57mvpPcrF7ZODyhswtd59+/jdgw+fwBNS
+xLSscksUPIDqwwNmCez3PpxGeyBYg6HE0YdcWBxcKczYzuVJi5Wu915vn5oWePCCoPUZBN5B7IgV
+MCi54ZDLG7TUZ0HweXkb3M5vFmSpFm/gthhBx0UrveoPpv9AJ9unIbQYdUoe21bKg2q48sPFGVwu
+H+afrxd1qvclaNlRFyh1EQ2sSccEuNAGWQwysfVpz1tPajUqbqJUnEcIJkWo6OXDaodK8ZiLdbmM
+L1wb+9H0D+pcyPSrX5u5kgWSygRYXCnJUi/KKcuU4cqsAyTKZBiissLc7NFwizvjxtieKBVCIdWz
+fzilzPaYyljZN0cGN1v7NnaIPNCGmVy3GKuJaQ6iVjE1Qfm+36hglErwmnAD8hu0dDy4uICBA8ZV
+pQr/q/+O0KFW2kjelu9Dgb9SDBsWV4F4x5CswgS0zBVlk5tDMP5bVtUGpslbm81Lu2sdKq7uNMGh
+MVQ4fy9xhogC1lS5guhISa0DlBWv0O8odT6/LP+4WZzDV6FzIkEqC0uolGZSZoMnlpxplmD2euaT
+O4hkTpPnbztDccey0bhjDaBIqaWQa0uwEtQEwtyU56i4fq54F9IE3ORR6mKriODM4XOYZwaVYLYz
+7SPbKkz4i7VkB6/Ot1upDE3znNqYKpM8raa0Bx8vfvntJ32UENsM4aI6gJL+jJwhxhh3jVIDOcpi
+m0r2hmEtS8XXXNBk71QCDXTBNhhPiHX2LtHkrVIlhoEshH/EZgdq53Eirqs5iFKMnkOmqZTtr3Xq
+djvPTWZT4S3NT5aVLgurMPUWI07BRVYqkQrmtCKohNY8qu9EdACoT6ki0a66XxVF4f9AQ3W38yO5
+mWmZmIIpnDFrbXakvKWeZhLwhvrbUH8fahhqD0YUcBDJjEBMQwiznE4y5QbHrbhHBOnUAYzb2tVN
+jJa65e+eE2Ya30E2GurxUP8ssA6e/wOnvo3V78d3vTcvMB3n7l3iX1JXWqk=
+""")
+
+##file activate.csh
+ACTIVATE_CSH = convert("""
+eJx9U11vmzAUffevOCVRu+UB9pws29Kl0iq1aVWllaZlcgxciiViItsQdb9+xiQp+dh4QOB7Pu49
+XHqY59IgkwVhVRmLmFAZSrGRNkdgykonhFiqSCRW1sJSmJg8wCDT5QrucRCyHn6WFRKhVGmhKwVp
+kUpNiS3emup3TY6XIn7DVNQyJUwlrgthJD6n/iCNv72uhCzCpFx9CRkThRQGKe08cWXJ9db/yh/u
+pvzl9mn+PLnjj5P5D1yM8QmXlzBkSdXwZ0H/BBc0mEo5FE5qI2jKhclHOOvy9HD/OO/6YO1mX9vx
+sY0H/tPIV0dtqel0V7iZvWyNg8XFcBA0ToEqVeqOdNUEQFvN41SumAv32VtJrakQNSmLWmgp4oJM
+yDoBHgoydtoEAs47r5wHHnUal5vbJ8oOI+9wI86vb2d8Nrm/4Xy4RZ8R85E4uTZPB5EZPnTaaAGu
+E59J8BE2J8XgrkbLeXMlVoQxznEYFYY8uFFdxsKQRx90Giwx9vSueHP1YNaUSFG4vTaErNSYuBOF
+lXiVyXa9Sy3JdClEyK1dD6Nos9mEf8iKlOpmqSNTZnYjNEWiUYn2pKNB3ttcLJ3HmYYXy6Un76f7
+r8rRsC1TpTJj7f19m5sUf/V3Ir+x/yjtLu8KjLX/CmN/AcVGUUo=
+""")
+
+##file activate.bat
+ACTIVATE_BAT = convert("""
+eJyFUkEKgzAQvAfyhz0YaL9QEWpRqlSjWGspFPZQTevFHOr/adQaU1GaUzI7Mzu7ZF89XhKkEJS8
+qxaKMMsvboQ+LxxE44VICSW1gEa2UFaibqoS0iyJ0xw2lIA6nX5AHCu1jpRsv5KRjknkac9VLVug
+sX9mtzxIeJDE/mg4OGp47qoLo3NHX2jsMB3AiDht5hryAUOEifoTdCXbSh7V0My2NMq/Xbh5MEjU
+ZT63gpgNT9lKOJ/CtHsvT99re3pX303kydn4HeyOeAg5cjf2EW1D6HOPkg9NGKhu
+""")
+
+##file deactivate.bat
+DEACTIVATE_BAT = convert("""
+eJxzSE3OyFfIT0vj4spMU0hJTcvMS01RiPf3cYkP8wwKCXX0iQ8I8vcNCFHQ4FIAguLUEgWIgK0q
+FlWqXJpcICVYpGzx2BAZ4uHv5+Hv6wq1BWINXBTdKriEKkI1DhW2QAfhttcxxANiFZCBbglQSJUL
+i2dASrm4rFz9XLgAwJNbyQ==
+""")
+
+##file activate.ps1
+ACTIVATE_PS = convert("""
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+NlLCq8zsp085MNh/+R4t1Q8yxoSv8PUpTt7izZwf2BTHZZ3pIZpUIpuLkL1nNL6sYcHqcKm237wp
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+QastYw==
+""")
+
+##file distutils-init.py
+DISTUTILS_INIT = convert("""
+eJytV92L4zYQf/dfMU0ottuse7RvC6FQrg8Lxz2Ugz4si9HacqKuIxlJ2ST313dG8odkO9d7aGBB
+luZLv/nNjFacOqUtKJMIvzK3cXlhWgp5MDBsqK5SNYftsBAGpLLA4F1oe2Ytl+9wUvW55TswCi4c
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+5C4rFgwLGfMvJuAMew==
+""")
+
+##file distutils.cfg
+DISTUTILS_CFG = convert("""
+eJxNj00KwkAMhfc9xYNuxe4Ft57AjYiUtDO1wXSmNJnK3N5pdSEEAu8nH6lxHVlRhtDHMPATA4uH
+xJ4EFmGbvfJiicSHFRzUSISMY6hq3GLCRLnIvSTnEefN0FIjw5tF0Hkk9Q5dRunBsVoyFi24aaLg
+9FDOlL0FPGluf4QjcInLlxd6f6rqkgPu/5nHLg0cXCscXoozRrP51DRT3j9QNl99AP53T2Q=
+""")
+
+##file activate_this.py
+ACTIVATE_THIS = convert("""
+eJyNU01v2zAMvetXEB4K21jmDOstQA4dMGCHbeihlyEIDMWmG62yJEiKE//7kXKdpN2KzYBt8euR
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+XL+sMgXnX0D+Te2Iy5xdP8yueSlQB/x/ED2BTAtyE3K4SYUN6AMNfbO63f4lBW3bUJPbTL+mjSxS
+PyRfJkZRgj+VbFv+EzHFi5pKwUEepa4JslMnwkowSRCXI+m5XvEOvtuBrxHdhLalG0JofYBok6qj
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+s3az+sj7eA0jfgPfeoN1
+""")
+
+if __name__ == '__main__':
+    main()
+
+## TODO:
+## Copy python.exe.manifest
+## Monkeypatch distutils.sysconfig