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holger krekel  committed 9fd1946

ref pull request 65
make tox run its tests against python2.5 as well
vendor virtualenv as 'virtualenv.py' instead of 'virtualenv-1.9.1.py'
which triggers some weird logic preventing tox to run its tests on
itself.

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  • Parent commits 182e8f0

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Files changed (9)

         platforms=['unix', 'linux', 'osx', 'cygwin', 'win32'],
         author='holger krekel',
         author_email='holger@merlinux.eu',
-        packages=['tox', ],
+        packages=['tox', 'tox.vendor'],
         entry_points={'console_scripts': 'tox=tox:cmdline\ntox-quickstart=tox._quickstart:main'},
         # we use a public tox version to test, see tox.ini's testenv
         # "deps" definition for the required dependencies

File tests/test_venv.py

 from tox._venv import find_executable
 from tox._venv import _getinterpreterversion
 
+py25calls = int(sys.version_info[:2] == (2,5))
+
 #def test_global_virtualenv(capfd):
 #    v = VirtualEnv()
 #    l = v.list()
     l = mocksession._pcalls
     assert len(l) >= 1
     args = l[0].args
-    assert str(args[1]).endswith("virtualenv.py")
+    assert "virtualenv" in str(args[1])
     if sys.platform != "win32":
         # realpath is needed for stuff like the debian symlinks
         assert py.path.local(sys.executable).realpath() == args[0]
     venv = mocksession.getenv("py123")
     venv.create()
     l = mocksession._pcalls
-    assert len(l) == 1
+    assert len(l) == 1 + py25calls
     distshare = venv.session.config.distshare
     distshare.ensure("dep1-1.0.zip")
     distshare.ensure("dep1-1.1.zip")
 
     venv.install_deps()
-    assert len(l) == 2
-    args = l[1].args
-    assert l[1].cwd == venv.envconfig.envlogdir
+    assert len(l) == 2 + py25calls
+    args = l[-1].args
+    assert l[-1].cwd == venv.envconfig.envlogdir
     assert "pip" in str(args[0])
     assert args[1] == "install"
     #arg = "--download-cache=" + str(venv.envconfig.downloadcache)
     venv = mocksession.getenv("py123")
     venv.create()
     l = mocksession._pcalls
-    assert len(l) == 1
+    assert len(l) == 1 + py25calls
 
     venv.install_deps()
-    assert len(l) == 2
-    args = l[1].args
-    assert l[1].cwd == venv.envconfig.envlogdir
+    assert len(l) == 2 + py25calls
+    args = l[-1].args
+    assert l[-1].cwd == venv.envconfig.envlogdir
     assert "pip" in str(args[0])
     assert args[1] == "install"
     assert "dep1" in args
     venv = mocksession.getenv('py123')
     venv.create()
     l = mocksession._pcalls
-    assert len(l) == 1
+    assert len(l) == 1 + py25calls
     l[:] = []
 
     venv.install_deps()

File tests/test_z_cmdline.py

 import pytest
 import sys
 from tox._pytestplugin import ReportExpectMock
+try:
+    import json
+except ImportError:
+    import simplejson as json
 
 pytest_plugins = "pytester"
 
+if sys.version_info < (2,6):
+    PIP_INSECURE = "setenv = PIP_INSECURE=1"
+else:
+    PIP_INSECURE = ""
+
 from tox._cmdline import Session
 from tox._config import parseconfig
 
         "*InvocationError*",
     ])
 
+
+
 class TestToxRun:
     @pytest.fixture
     def example123(self, initproj):
             'tox.ini': '''
                 [testenv]
                 changedir=tests
+                %s
                 commands= py.test --basetemp={envtmpdir} --junitxml=junit-{envname}.xml
                 deps=pytest
-            '''
+            ''' % PIP_INSECURE
         })
 
     def test_toxuone_env(self, cmd, example123):
         jsonpath = cmd.tmpdir.join("res.json")
         result = cmd.run("tox", "--result-json", jsonpath)
         assert result.ret == 1
-        data = py.std.json.load(jsonpath.open("r"))
+        data = json.load(jsonpath.open("r"))
         verify_json_report_format(data)
         result.stdout.fnmatch_lines([
             "*1 failed*",
             [testenv]
             usedevelop=True
             changedir=tests
+            %s
             commands=
                 py.test --basetemp={envtmpdir} --junitxml=junit-{envname}.xml []
             deps=pytest
-        '''
+        ''' % PIP_INSECURE
     })
     result = cmd.run("tox", "-v")
     assert not result.ret
 [tox]
-envlist=py27,py26,py32,py33,pypy
+envlist=py25,py27,py26,py32,py33,pypy
 
 [testenv:X]
 commands=echo {posargs}

File tox/_cmdline.py

 
     def info_versions(self):
         versions = ['tox-%s' % tox.__version__]
-        version = py.process.cmdexec("virtualenv --version")
-        versions.append("virtualenv-%s" % version.strip())
+        try:
+            version = py.process.cmdexec("virtualenv --version")
+        except py.process.cmdexec.Error:
+            versions.append("virtualenv-1.9.1 (vendored)")
+        else:
+            versions.append("virtualenv-%s" % version.strip())
         self.report.keyvalue("tool-versions:", " ".join(versions))
 
 

File tox/_venv.py

         if action is None:
             action = self.session.newaction(self, "create")
         config_interpreter = self.getsupportedinterpreter()
-        config_interpreter_version = _getinterpreterversion(config_interpreter)
+        config_interpreter_version = _getinterpreterversion(
+            config_interpreter)
         use_venv191 = config_interpreter_version < '2.6'
         use_pip13 = config_interpreter_version < '2.6'
         if not use_venv191:
             f.close()
             venvscript = path.rstrip("co")
         else:
-            venvscript = py.path.local(tox.__file__).dirpath("virtualenv-1.9.1.py")
-        args = [config_interpreter, venvscript]
+            venvscript = py.path.local(tox.__file__).dirpath(
+                            "vendor", "virtualenv.py")
+        args = [config_interpreter, str(venvscript)]
         if self.envconfig.distribute:
             args.append("--distribute")
         else:
             args.append("--setuptools")
         if self.envconfig.sitepackages:
             args.append('--system-site-packages')
-        # add interpreter explicitly, to prevent using default (virtualenv.ini)
+        # add interpreter explicitly, to prevent using
+        # default (virtualenv.ini)
         args.extend(['--python', str(config_interpreter)])
         #if sys.platform == "win32":
         #    f, path, _ = py.std.imp.find_module("virtualenv")
             indexserver = self.envconfig.config.indexserver['default'].url
             action = self.session.newaction(self, "pip_downgrade")
             action.setactivity('pip-downgrade', 'pip<1.4')
-            argv = ["easy_install"] + self._commoninstallopts(indexserver) + ['pip<1.4']
-            self._pcall(argv, cwd=self.envconfig.envlogdir, action=action)
+            argv = ["easy_install"] + \
+                   self._installopts(indexserver) + ['pip<1.4']
+            self._pcall(argv, cwd=self.envconfig.envlogdir,
+                        action=action)
 
     def finish(self):
         self._getliveconfig().writeconfig(self.path_config)

File tox/vendor/__init__.py

+#

File tox/vendor/virtualenv.py

+#!/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.
+__version__ = "1.9.1"  # following best practices
+virtualenv_version = __version__  # legacy, again
+
+import base64
+import sys
+import os
+import codecs
+import optparse
+import re
+import shutil
+import logging
+import tempfile
+import zlib
+import errno
+import glob
+import distutils.sysconfig
+from distutils.util import strtobool
+import struct
+import subprocess
+
+if sys.version_info < (2, 5):
+    print('ERROR: %s' % sys.exc_info()[1])
+    print('ERROR: this script requires Python 2.5 or greater.')
+    sys.exit(101)
+
+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')
+is_cygwin = (sys.platform == 'cygwin')
+is_darwin = (sys.platform == 'darwin')
+abiflags = getattr(sys, 'abiflags', '')
+
+user_dir = os.path.expanduser('~')
+if is_win:
+    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', 'tokenize', 'token',
+                             'functools', 'heapq', 'bisect', 'weakref',
+                             'reprlib'])
+    if minver >= 2:
+        REQUIRED_FILES[-1] = 'config-%s' % majver
+    if minver == 3:
+        import sysconfig
+        platdir = sysconfig.get_config_var('PLATDIR')
+        REQUIRED_FILES.append(platdir)
+        # 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",
+            "imp",
+            "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.ERROR, 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.encode("utf-8"):
+            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):
+        files = glob.glob(os.path.join(dir, filename))
+        if files and os.path.isfile(files[0]):
+            return True, files[0]
+    return False, 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:
+        egg_path = 'setuptools-*-py%s.egg' % sys.version[:3]
+        found, egg_path = _find_file(egg_path, search_dirs)
+        project_name = 'setuptools'
+        bootstrap_script = EZ_SETUP_PY
+        tgz_path = None
+    else:
+        # Look for a distribute egg (these are not distributed by default,
+        # but can be made available by the user)
+        egg_path = 'distribute-*-py%s.egg' % sys.version[:3]
+        found, egg_path = _find_file(egg_path, search_dirs)
+        project_name = 'distribute'
+        if found:
+            tgz_path = None
+            bootstrap_script = DISTRIBUTE_FROM_EGG_PY
+        else:
+            # Fall back to sdist
+            # NB: egg_path is not None iff tgz_path is None
+            # iff bootstrap_script is a generic setup script accepting
+            # the standard arguments.
+            egg_path = None
+            tgz_path = 'distribute-*.tar.gz'
+            found, tgz_path = _find_file(tgz_path, search_dirs)
+            bootstrap_script = DISTRIBUTE_SETUP_PY
+
+    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 and egg_path:
+        cmd.append('--always-unzip')
+    env = {}
+    remove_from_env = ['__PYVENV_LAUNCHER__']
+    if logger.stdout_level_matches(logger.DEBUG) and egg_path:
+        cmd.append('-v')
+
+    old_chdir = os.getcwd()
+    if egg_path is not None and os.path.exists(egg_path):
+        logger.info('Using existing %s egg: %s' % (project_name, egg_path))
+        cmd.append(egg_path)
+        if os.environ.get('PYTHONPATH'):
+            env['PYTHONPATH'] = egg_path + os.path.pathsep + os.environ['PYTHONPATH']
+        else:
+            env['PYTHONPATH'] = egg_path
+    elif tgz_path is not None and os.path.exists(tgz_path):
+        # Found a tgz source dist, let's chdir
+        logger.info('Using existing %s egg: %s' % (project_name, tgz_path))
+        os.chdir(os.path.dirname(tgz_path))
+        # 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')
+    elif 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,
+                                        egg_path or tgz_path,
+                                        search_dirs))
+        sys.exit(1)
+    elif egg_path:
+        logger.info('No %s egg found; downloading' % project_name)
+        cmd.extend(['--always-copy', '-U', project_name])
+    else:
+        logger.info('No %s tgz found; downloading' % 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 tgz_path is not None and os.path.exists(tgz_path):
+            # the current working dir is hostile, let's copy the
+            # tarball to a temp dir
+            target = os.path.join(cwd, os.path.split(tgz_path)[-1])
+            shutil.copy(tgz_path, 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 cwd is not None:
+            shutil.rmtree(cwd)
+        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 is_win:
+        easy_install_script = 'easy_install-script.py'
+    # There's two subtle issues here when invoking easy_install.
+    # 1. On unix-like systems the easy_install script can *only* be executed
+    #    directly if its full filesystem path is no longer than 78 characters.
+    # 2. A work around to [1] is to use the `python path/to/easy_install foo`
+    #    pattern, but that breaks if the path contains non-ASCII characters, as
+    #    you can't put the file encoding declaration before the shebang line.
+    # The solution is to use Python's -x flag to skip the first line of the
+    # script (and any ASCII decoding errors that may have occurred in that line)
+    cmd = [py_executable, '-x', join(os.path.dirname(py_executable), easy_install_script), filename]
+    # jython and pypy don't yet support -x
+    if is_jython or is_pypy:
+        cmd.remove('-x')
+    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 == 'store_false':
+                    val = not strtobool(val)
+                elif option.action in ('store_true', '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.set_defaults(system_site_packages=False)
+    parser.add_option(
+        '--no-site-packages',
+        dest='system_site_packages',
+        action='store_false',
+        help="Don't give access to the global site-packages dir to the "
+             "virtual environment (default)")
+
+    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', '--use-distribute',  # the second option is for legacy reasons here. Hi Kenneth!
+        dest='use_distribute',
+        action='store_true',
+        help='Use Distribute instead of Setuptools. Set environ variable '
+        'VIRTUALENV_DISTRIBUTE to make it the default ')
+
+    parser.add_option(
+        '--no-setuptools',
+        dest='no_setuptools',
+        action='store_true',
+        help='Do not install distribute/setuptools (or pip) '
+        'in the new virtualenv.')
+
+    parser.add_option(
+        '--no-pip',
+        dest='no_pip',
+        action='store_true',
+        help='Do not install pip in the new virtualenv.')
+
+    parser.add_option(
+        '--setuptools',
+        dest='use_distribute',
+        action='store_false',
+        help='Use Setuptools instead of Distribute.  Set environ variable '
+        'VIRTUALENV_SETUPTOOLS to make it the default ')
+
+    # Set this to True to use distribute by default, even in Python 2.
+    parser.set_defaults(use_distribute=False)
+
+    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
+
+    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,
+                       no_setuptools=options.no_setuptools,
+                       no_pip=options.no_pip)
+    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,
+                       no_setuptools=False, no_pip=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)
+
+    if not no_setuptools:
+        if 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)
+
+        if not no_pip:
+            install_pip(py_executable, search_dirs=search_dirs, never_download=never_download)
+
+    install_activate(home_dir, bin_dir, prompt)
+
+def is_executable_file(fpath):
+    return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
+
+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 is_win:
+        # 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:
+            import ctypes
+            GetShortPathName = ctypes.windll.kernel32.GetShortPathNameW
+            size = max(len(home_dir)+1, 256)
+            buf = ctypes.create_unicode_buffer(size)
+            try:
+                u = unicode
+            except NameError:
+                u = str
+            ret = GetShortPathName(u(home_dir), buf, size)
+            if not ret:
+                print('Error: the path "%s" has a space in it' % home_dir)
+                print('We could not determine the short pathname for it.')
+                print('Exiting.')
+                sys.exit(3)
+            home_dir = str(buf.value)
+        lib_dir = join(home_dir, 'Lib')
+        inc_dir = join(home_dir, 'Include')
+        bin_dir = join(home_dir, 'Scripts')
+    if 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')
+    elif not is_win:
+        lib_dir = join(home_dir, 'lib', py_version)
+        multiarch_exec = '/usr/bin/multiarch-platform'
+        if is_executable_file(multiarch_exec):
+            # In Mageia (2) and Mandriva distros the include dir must be like:
+            # virtualenv/include/multiarch-x86_64-linux/python2.7
+            # instead of being virtualenv/include/python2.7
+            p = subprocess.Popen(multiarch_exec, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            stdout, stderr = p.communicate()
+            # stdout.strip is needed to remove newline character
+            inc_dir = join(home_dir, 'include', stdout.strip(), py_version + abiflags)
+        else:
+            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 is_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"),
+            # Python 2.6 no-frameworks
+            os.path.join("~", ".local", "lib","python", sys.version[:3], "site-packages"),
+            # System Python 2.7 on OSX Mountain Lion
+            os.path.join("~", "Library", "Python", sys.version[:3], "lib", "python", "site-packages")))
+
+    if hasattr(sys, 'real_prefix'):
+        prefixes.append(sys.real_prefix)
+    if hasattr(sys, 'base_prefix'):
+        prefixes.append(sys.base_prefix)
+    prefixes = list(map(os.path.expanduser, prefixes))
+    prefixes = list(map(os.path.abspath, prefixes))
+    # Check longer prefixes first so we don't split in the middle of a filename
+    prefixes = sorted(prefixes, key=len, reverse=True)
+    filename = os.path.abspath(filename)
+    for src_prefix in prefixes:
+        if filename.startswith(src_prefix):
+            _, relpath = filename.split(src_prefix, 1)
+            if src_prefix != os.sep: # sys.prefix == "/"
+                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()
+                # special-case custom readline.so on OS X, but not for pypy:
+                if modname == 'readline' and sys.platform == 'darwin' and not (
+                        is_pypy or filename.endswith(join('lib-dynload', 'readline.so'))):
+                    dst_filename = join(dst_prefix, 'lib', 'python%s' % sys.version[:3], 'readline.so')
+                else:
+                    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 subst_path(prefix_path, prefix, home_dir):
+    prefix_path = os.path.normpath(prefix_path)
+    prefix = os.path.normpath(prefix)
+    home_dir = os.path.normpath(home_dir)
+    if not prefix_path.startswith(prefix):
+        logger.warn('Path not in prefix %r %r', prefix_path, prefix)
+        return
+    return prefix_path.replace(prefix, home_dir, 1)
+
+
+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
+    elif hasattr(sys, 'base_prefix'):
+        logger.notify('Using base prefix %r' % sys.base_prefix)
+        prefix = sys.base_prefix
+    else:
+        prefix = sys.prefix
+    mkdir(lib_dir)
+    fix_lib64(lib_dir)
+    stdlib_dirs = [os.path.dirname(os.__file__)]
+    if is_win:
+        stdlib_dirs.append(join(os.path.dirname(stdlib_dirs[0]), 'DLLs'))
+    elif is_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, '')
+
+    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)
+
+    platinc_dir = distutils.sysconfig.get_python_inc(plat_specific=1)
+    if platinc_dir != stdinc_dir:
+        platinc_dest = distutils.sysconfig.get_python_inc(
+            plat_specific=1, prefix=home_dir)
+        if platinc_dir == platinc_dest:
+            # Do platinc_dest manually due to a CPython bug;
+            # not http://bugs.python.org/issue3386 but a close cousin
+            platinc_dest = subst_path(platinc_dir, prefix, home_dir)
+        if platinc_dest:
+            # PyPy's stdinc_dir and prefix are relative to the original binary
+            # (traversing virtualenvs), whereas the platinc_dir is relative to
+            # the inner virtualenv and ignores the prefix argument.
+            # This seems more evolved than designed.
+            copyfile(platinc_dir, platinc_dest)
+
+    # pypy never uses exec_prefix, just ignore it
+    if sys.exec_prefix != prefix and not is_pypy:
+        if is_win:
+            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:
+        # OS X framework builds cause validation to break
+        # https://github.com/pypa/virtualenv/issues/322
+        if os.environ.get('__PYVENV_LAUNCHER__'):
+          os.unsetenv('__PYVENV_LAUNCHER__')
+        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
+        shutil.copyfile(executable, py_executable)
+        make_exe(py_executable)
+        if is_win or is_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')
+            if sys.platform in ('win32', 'cygwin'):
+                python_executable += '.exe'
+            logger.info('Also created executable %s' % python_executable)
+            copyfile(py_executable, python_executable)
+
+            if is_win:
+                for name in 'libexpat.dll', 'libpypy.dll', 'libpypy-c.dll', 'libeay32.dll', 'ssleay32.dll', 'sqlite.dll':
+                    src = join(prefix, name)
+                    if os.path.exists(src):
+                        copyfile(src, join(bin_dir, name))
+
+    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:
+            mach_o_change(py_executable,
+                          os.path.join(prefix, 'Python'),
+                          '@executable_path/../.Python')
+        except:
+            e = sys.exc_info()[1]
+            logger.warn("Could not call mach_o_change: %s. "
+                        "Trying to call install_name_tool instead." % e)
+            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
+
+    if not is_win:
+        # Ensure that 'python', 'pythonX' and 'pythonX.Y' all exist
+        py_exe_version_major = 'python%s' % sys.version_info[0]
+        py_exe_version_major_minor = 'python%s.%s' % (
+            sys.version_info[0], sys.version_info[1])
+        py_exe_no_version = 'python'
+        required_symlinks = [ py_exe_no_version, py_exe_version_major,
+                         py_exe_version_major_minor ]
+
+        py_executable_base = os.path.basename(py_executable)
+
+        if py_executable_base in required_symlinks:
+            # Don't try to symlink to yourself.
+            required_symlinks.remove(py_executable_base)
+
+        for pth in required_symlinks:
+            full_pth = join(bin_dir, pth)
+            if os.path.exists(full_pth):
+                os.unlink(full_pth)
+            os.symlink(py_executable_base, full_pth)
+
+    if is_win 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
+    # NOTE: keep this check as one line, cmd.exe doesn't cope with line breaks
+    cmd = [py_executable, '-c', 'import sys;out=sys.stdout;'
+        'getattr(out, "buffer", out).write(sys.prefix.encode("utf-8"))']
+    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 is_win:
+            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)
+
+    if site_packages:
+        if os.path.exists(site_packages_filename):
+            logger.info('Deleting %s' % site_packages_filename)
+            os.unlink(site_packages_filename)
+
+    return py_executable
+
+
+def install_activate(home_dir, bin_dir, prompt=None):
+    home_dir = os.path.abspath(home_dir)
+    if is_win 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)
+        top_level = os.path.dirname(lib_parent)
+        lib_dir = os.path.join(top_level, 'lib')
+        lib64_link = os.path.join(top_level, 'lib64')
+        assert os.path.basename(lib_parent) == 'lib', (
+            "Unexpected parent dir: %r" % lib_parent)
+        if os.path.lexists(lib64_link):
+            return
+        os.symlink('lib', lib64_link)
+
+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]
+    if is_win:
+        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)
+        script = relative_script([new_shebang] + lines[1:])
+        f = open(filename, 'wb')
+        f.write('\n'.join(script).encode('utf-8'))
+        f.close()
+
+def relative_script(lines):
+    "Return a script that'll work in a relocatable environment."
+    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"
+    # Find the last future statement in the script. If we insert the activation
+    # line before a future statement, Python will raise a SyntaxError.
+    activate_at = None
+    for idx, line in reversed(list(enumerate(lines))):
+        if line.split()[:3] == ['from', '__future__', 'import']:
+            activate_at = idx + 1
+            break
+    if activate_at is None:
+        # Activate after the shebang.
+        activate_at = 1
+    return lines[:activate_at] + ['', activate, ''] + lines[activate_at:]
+
+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.readline().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=''):
+    """