bootstrap.py

#!/usr/bin/env python
## WARNING: This file is generated
#!/usr/bin/env python
"""Create a "virtual" Python installation
"""

import sys
import os
import optparse
import shutil
import logging
import distutils.sysconfig
try:
    import subprocess
except ImportError, e:
    if sys.version_info <= (2, 3):
        print 'ERROR: %s' % e
        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
    
join = os.path.join
py_version = 'python%s.%s' % (sys.version_info[0], sys.version_info[1])
is_jython = sys.platform.startswith('java')
expected_exe = is_jython and 'jython' or 'python'

REQUIRED_MODULES = ['os', 'posix', 'posixpath', 'ntpath', 'genericpath',
                    'fnmatch', 'locale', 'encodings', 'codecs',
                    'stat', 'UserDict', 'readline', 'copy_reg', 'types',
                    're', 'sre', 'sre_parse', 'sre_constants', 'sre_compile',
                    'lib-dynload', 'config', 'zlib']

if sys.version_info[:2] == (2, 6):
    REQUIRED_MODULES.extend(['warnings', 'linecache', '_abcoll', 'abc'])
if sys.version_info[:2] <= (2, 3):
    REQUIRED_MODULES.extend(['sets', '__future__'])

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 or 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)

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 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 symlink and hasattr(os, 'symlink'):
        logger.info('Symlinking %s', dest)
        os.symlink(os.path.abspath(src), dest)
    else:
        logger.info('Copying to %s', dest)
        if os.path.isdir(src):
            shutil.copytree(src, dest, True)
        else:
            shutil.copy2(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)
        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)
            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 & 07777
        newmode = (oldmode | 0555) & 07777
        os.chmod(fn, newmode)
        logger.info('Changed mode of %s to %s', fn, oct(newmode))

def install_setuptools(py_executable, unzip=False):
    setup_fn = 'setuptools-0.6c9-py%s.egg' % sys.version[:3]
    search_dirs = ['.', os.path.dirname(__file__), join(os.path.dirname(__file__), 'support-files')]
    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:
            search_dirs.append(os.path.join(os.path.dirname(virtualenv.__file__), 'support-files'))
    for dir in search_dirs:
        if os.path.exists(join(dir, setup_fn)):
            setup_fn = join(dir, setup_fn)
            break
    if is_jython and os._name == 'nt':
        # Jython's .bat sys.executable can't handle a command line
        # argument with newlines
        import tempfile
        fd, ez_setup = tempfile.mkstemp('.py')
        os.write(fd, EZ_SETUP_PY)
        os.close(fd)
        cmd = [py_executable, ez_setup]
    else:
        cmd = [py_executable, '-c', EZ_SETUP_PY]
    if unzip:
        cmd.append('--always-unzip')
    env = {}
    if logger.stdout_level_matches(logger.DEBUG):
        cmd.append('-v')
    if os.path.exists(setup_fn):
        logger.info('Using existing Setuptools egg: %s', 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:
        logger.info('No Setuptools egg found; downloading')
        cmd.extend(['--always-copy', '-U', 'setuptools'])
    logger.start_progress('Installing setuptools...')
    logger.indent += 2
    cwd = None
    if not os.access(os.getcwd(), os.W_OK):
        cwd = '/tmp'
    try:
        call_subprocess(cmd, show_stdout=False,
                        filter_stdout=filter_ez_setup,
                        extra_env=env,
                        cwd=cwd)
    finally:
        logger.indent -= 2
        logger.end_progress()
        if is_jython and os._name == 'nt':
            os.remove(ez_setup)

def filter_ez_setup(line):
    if not line.strip():
        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

def main():
    parser = optparse.OptionParser(
        version="1.3.2",
        usage="%prog [OPTIONS] DEST_DIR")

    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(
        '--unzip-setuptools',
        dest='unzip_setuptools',
        action='store_true',
        help="Unzip Setuptools 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')

    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]
            os.execvpe(interpreter, [interpreter, file] + sys.argv[1:], env)

    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 os.environ.get('PYTHONHOME'):
        if sys.platform == 'win32':
            name = '%PYTHONHOME%'
        else:
            name = '$PYTHONHOME'
        logger.warn('%s is set; this can cause problems creating environments' % name)

    if options.relocatable:
        make_environment_relocatable(home_dir)
        return

    create_environment(home_dir, site_packages=not options.no_site_packages, clear=options.clear,
                       unzip_setuptools=options.unzip_setuptools)
    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):
    cmd_parts = []
    for part in cmd:
        if len(part) > 40:
            part = part[:30]+"..."+part[-5:]
        if ' ' in part or '\n' in part or '"' in part or "'" in part:
            part = '"%s"' % part.replace('"', '\\"')
        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:
        env = os.environ.copy()
        env.update(extra_env)
    else:
        env = None
    try:
        proc = subprocess.Popen(
            cmd, stderr=subprocess.STDOUT, stdin=None, stdout=stdout,
            cwd=cwd, env=env)
    except Exception, e:
        logger.fatal(
            "Error %s while executing command %s" % (e, cmd_desc))
        raise
    all_output = []
    if stdout is not None:
        stdout = proc.stdout
        while 1:
            line = stdout.readline()
            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=True, clear=False,
                       unzip_setuptools=False):
    """
    Creates a new environment in ``home_dir``.

    If ``site_packages`` is true (the default) then the global
    ``site-packages/`` directory will be on the path.

    If ``clear`` is true (default False) then the environment will
    first be cleared.
    """
    # 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':
        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')
    else:
        lib_dir = join(home_dir, 'lib', py_version)
        inc_dir = join(home_dir, 'include', py_version)
        bin_dir = join(home_dir, 'bin')

    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'))
    for stdlib_dir in stdlib_dirs:
        if not os.path.isdir(stdlib_dir):
            continue
        if hasattr(os, 'symlink'):
            logger.info('Symlinking Python bootstrap modules')
        else:
            logger.info('Copying Python bootstrap modules')
        logger.indent += 2
        try:
            for fn in os.listdir(stdlib_dir):
                if fn != 'site-packages' and os.path.splitext(fn)[0] in REQUIRED_MODULES:
                    copyfile(join(stdlib_dir, fn), join(lib_dir, fn))
        finally:
            logger.indent -= 2
    mkdir(join(lib_dir, 'site-packages'))
    writefile(join(lib_dir, 'site.py'), SITE_PY)
    writefile(join(lib_dir, 'orig-prefix.txt'), prefix)
    site_packages_filename = join(lib_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)

    stdinc_dir = join(prefix, 'include', py_version)
    if os.path.exists(stdinc_dir):
        copyfile(stdinc_dir, inc_dir)
    else:
        logger.debug('No include dir %s' % stdinc_dir)

    if sys.exec_prefix != prefix:
        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.jar and javalib/ dir, or just
        # jython-complete.jar
        for name in 'jython.jar', 'javalib', 'jython-complete.jar':
            src = join(prefix, name)
            if os.path.exists(src):
                copyfile(src, join(home_dir, name))
        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 py_executable.endswith('/Python'):
            # 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)
    if sys.executable != py_executable:
        ## FIXME: could I just hard link?
        executable = sys.executable
        if (sys.platform == 'cygwin' and not os.path.exists(executable)
            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 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 'Python.framework' in prefix:
        logger.debug('MacOSX Python framework detected')

        # 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
        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)

    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; print sys.prefix']
    logger.info('Testing executable with %s %s "%s"' % tuple(cmd))
    proc = subprocess.Popen(cmd,
                            stdout=subprocess.PIPE)
    proc_stdout, proc_stderr = proc.communicate()
    proc_stdout = os.path.normcase(os.path.abspath(proc_stdout.strip()))
    if proc_stdout != os.path.normcase(os.path.abspath(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, os.path.normcase(os.path.abspath(home_dir))))
        logger.fatal(
            'ERROR: virtualenv is not compatible with this system or executable')
        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)

    install_distutils(lib_dir, home_dir)

    install_setuptools(py_executable, unzip=unzip_setuptools)

    install_activate(home_dir, bin_dir)

def install_activate(home_dir, bin_dir):
    if sys.platform == 'win32' or is_jython and os._name == 'nt':
        files = {'activate.bat': ACTIVATE_BAT,
                 'deactivate.bat': DEACTIVATE_BAT}
        if os.environ.get('OS') == 'Windows_NT' and os.environ.get('OSTYPE') == 'cygwin':
            files['activate'] = ACTIVATE_SH
    else:
        files = {'activate': ACTIVATE_SH}
    files['activate_this.py'] = ACTIVATE_THIS
    for name, content in files.items():
        content = content.replace('__VIRTUAL_ENV__', os.path.abspath(home_dir))
        content = content.replace('__VIRTUAL_NAME__', os.path.basename(os.path.abspath(home_dir)))
        content = content.replace('__BIN_NAME__', os.path.basename(bin_dir))
        writefile(os.path.join(bin_dir, name), content)

def install_distutils(lib_dir, home_dir):
    distutils_path = os.path.join(lib_dir, 'distutils')
    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_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))
        sys.exit(3)
    return exe

############################################################
## 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.
    """
    activate_this = os.path.join(home_dir, 'bin', '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(__file__), 'activate_this.py'); execfile(activate_this, dict(__file__=activate_this)); del os, activate_this"
    bin_dir = os.path.join(home_dir, 'bin')
    for filename in os.listdir(bin_dir):
        filename = os.path.join(bin_dir, filename)
        f = open(filename, 'rb')
        lines = f.readlines()
        f.close()
        if not lines:
            logger.warn('Script %s is an empty file' % filename)
            continue
        if lines[0].strip() != 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.writelines(lines)
        f.close()

def fixup_pth_and_egg_link(home_dir):
    """Makes .pth and .egg-link files use relative paths"""
    home_dir = os.path.normcase(os.path.abspath(home_dir))
    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)

def adjust_options(options, args):
    args[:] = ['.']

def after_install(options, home_dir):
    if sys.platform == 'win32':
        bin_dir = join(home_dir, 'Scripts')
    else:
        bin_dir = join(home_dir, 'bin')
    subprocess.call([join(bin_dir, 'easy_install'), 'paver>=1.0a4'])
    subprocess.call([join(bin_dir, 'easy_install'), 'pip'])
    subprocess.call([join(bin_dir, 'paver'),'required'])

##file site.py
SITE_PY = """
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PQqZxyFYF1CYE1LTWKJmJByv27VknE6HTPESuSLFEyF0tPCVWeRHk+8315bfGgPv/wBR06QN
""".decode("base64").decode("zlib")

##file ez_setup.py
EZ_SETUP_PY = """
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woheJi7S138BSGV4QQ==
""".decode("base64").decode("zlib")

##file activate.sh
ACTIVATE_SH = """
eJytU99P2zAQfvdfcaQ8ABqN+srUh6IhUYmViXSdNECum1waS6ld2U6zgva/75ykNP0xpGnkIYl9
n8/fffddB8aZtJDKHGFRWAczhMJiAqV0GQRWFyZGmEkVitjJlXAYwEVq9AJmwmYXrANrXUAslNIO
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0DcE/lpq4yrg216hLDo4OFTFU8mqb6eu3Ga6yBNI0BHnqigQKoEXm32CMpNxBplYIQj6UCjWi4UP
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TRKJf63BC07XGrRLYo7JnrjXg4j0vNT16md0yyc3D9HwfnRE5Kq0S7Mjz9/aFPWOdSnqHTSJgAc9
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z1n/9znfzDgp8gduuMqz
""".decode("base64").decode("zlib")

##file activate.bat
ACTIVATE_BAT = """
eJx1kEEOgjAQRfc9xSxoAlfQkIiBCBFKg8iKZBbSKhu6kPvHFqQ0Ct3N9P2flzmJx0uBkpK8xQhN
VtX3KMeENSGiMyES0ksY1AidkP0gOuBVWfAafAL6mfC8CD3uXUgw4QuKZR7btr0c3aCoKTLMxl9I
F8Yp8VdrFhUJYgAW2zeK6tT10eOvjV7RCXiqUcHtmnGz0nb/clN6DpCDJddi56q0bRHPGfu6Hm0s
YTH5AJ7udMY=
""".decode("base64").decode("zlib")

##file deactivate.bat
DEACTIVATE_BAT = """
eJxzSE3OyFfIT0vj4spMU0hJTcvMS01RiPf3cYkP8wwKCXX0iQ8I8vcNCFHQ4FIAguLUEgWIgK0q
FlWqXJpcICVYpGzx2OAY4oFsPpCLbjpQCLvZILVcXFaufi5cACHzOrI=
""".decode("base64").decode("zlib")

##file distutils-init.py
DISTUTILS_INIT = """
eJytlcuq2zAQhvd6iuGEEhuC6ToQzqIXyKKl0C66EzrWOFarSEaSc3n7jizH8SWhXdSLoIx+jWa+
GY/VsbEugPVMpZW/DsuzcEaZg4eb4YM1lTp8E86jg9X0r/JgbAABJ+VCKzSaExytbDVuwFs4I5TC
QOsRVIBgoVJGQqgRfJBavTEmlTPiiLCjYIpGhLroLXHLhzYo7Xm0jxS/rDLZTJ6Nwyo4r5RGzvMN
rAc365ypanBirDvGRTa9JofdIpRscWbwn28Z0HNjVsRF1pni8/KDMh2RGa6CRpS/xQFBBHjnQTQN
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8mkL32vbagn71N4z9v3hUxytr/G9SM8+QE3jVNBwpU9ghNhW1YY+W777e64VeZIWvVnTZEMat2ku
01dMFuwP2YOSYA==
""".decode("base64").decode("zlib")

##file distutils.cfg
DISTUTILS_CFG = """
eJxNj00KwkAMhfc9xYNuxe4Ft57AjYiUtDO1wXSmNJnK3N5pdSEEAu8nH6lxHVlRhtDHMPATA4uH
xJ4EFmGbvfJiicSHFRzUSISMY6hq3GLCRLnIvSTnEefN0FIjw5tF0Hkk9Q5dRunBsVoyFi24aaLg
9FDOlL0FPGluf4QjcInLlxd6f6rqkgPu/5nHLg0cXCscXoozRrP51DRT3j9QNl99AP53T2Q=
""".decode("base64").decode("zlib")

##file activate_this.py
ACTIVATE_THIS = """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""".decode("base64").decode("zlib")

if __name__ == '__main__':
    main()

## TODO:
## Copy python.exe.manifest
## Monkeypatch distutils.sysconfig