Make sure the bootstrap script actually works::

    >>> import os, sys
    >>> from os.path import dirname, join
    >>> import zc.buildout
    >>> bootstrap_py = join(
    ...    dirname(
    ...     dirname(
    ...      dirname(
    ...       dirname(zc.buildout.__file__)
    ...        )
    ...      )
    ...    ),
    ...   'bootstrap', 'bootstrap.py')
    >>> sample_buildout = tmpdir('sample')
    >>> os.chdir(sample_buildout)
    >>> write('buildout.cfg',
    ... '''
    ... [buildout]
    ... parts =
    ... ''')
    >>> write('bootstrap.py', open(bootstrap_py).read())
    >>> print 'X'; print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py'); print 'X' # doctest: +ELLIPSIS
    X...
    Creating directory '/sample/bin'.
    Creating directory '/sample/parts'.
    Creating directory '/sample/eggs'.
    Creating directory '/sample/develop-eggs'.
    Generated script '/sample/bin/buildout'.
    ...

    >>> ls(sample_buildout)
    d  bin
    -  bootstrap.py
    -  buildout.cfg
    d  develop-eggs
    d  eggs
    d  parts


    >>> ls(sample_buildout, 'bin')
    -  buildout

    >>> print 'X'; ls(sample_buildout, 'eggs') # doctest: +ELLIPSIS
    X...
    d  zc.buildout-...egg

The buildout script it has generated is a new-style script, using a
customized site.py.

    >>> buildout_script = join(sample_buildout, 'bin', 'buildout')
    >>> if sys.platform.startswith('win'):
    ...     buildout_script += '-script.py'
    >>> print open(buildout_script).read() # doctest: +ELLIPSIS
    #...
    <BLANKLINE>
    import sys
    sys.path[0:0] = [
        '/sample/parts/buildout',
        ]
    <BLANKLINE>
    <BLANKLINE>
    import os
    path = sys.path[0]
    if os.environ.get('PYTHONPATH'):
        path = os.pathsep.join([path, os.environ['PYTHONPATH']])
    os.environ['BUILDOUT_ORIGINAL_PYTHONPATH'] = os.environ.get('PYTHONPATH', '')
    os.environ['PYTHONPATH'] = path
    import site # imports custom buildout-generated site.py
    <BLANKLINE>
    import zc.buildout.buildout
    <BLANKLINE>
    if __name__ == '__main__':
        zc.buildout.buildout.main()
    <BLANKLINE>

The bootstrap process prefers final versions of zc.buildout, so it has
selected the (generated-locally) 99.99 egg rather than the also-available
100.0b1 egg.  We can see that in the buildout script's site.py.

    >>> buildout_site_py = join(
    ...     sample_buildout, 'parts', 'buildout', 'site.py')
    >>> print open(buildout_site_py).read() # doctest: +ELLIPSIS
    "...
        buildout_paths = [
            '/sample/eggs/setuptools-...egg',
            '/sample/eggs/zc.buildout-99.99-pyN.N.egg'
            ]
    ...

If you want to accept early releases of zc.buildout, you either need to
specify an explicit version (using --version here and specifying the
version in the buildout configuration file using the
``buildout-version`` option or the ``versions`` option) or specify that you
accept early releases by using ``--accept-buildout-test-releases`` on the
bootstrap script.

Here's an example.

    >>> ignored = system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --accept-buildout-test-releases')
    >>> print open(buildout_site_py).read() # doctest: +ELLIPSIS
    "...
        buildout_paths = [
            '/sample/eggs/setuptools-...egg',
            '/sample/eggs/zc.buildout-100.0b1-pyN.N.egg'
            ]
    ...

Notice we are now using zc.buildout 100.0b1, a non-final release.

The buildout script remembers the decision to accept early releases, and
alerts the user.

    >>> print system(join('bin', 'buildout')),
    ... # doctest: +NORMALIZE_WHITESPACE
    NOTE: Accepting early releases of build system packages.  Rerun bootstrap
          without --accept-buildout-test-releases (-t) to return to default
          behavior.

This is accomplished within the script itself.

    >>> print open(buildout_script).read() # doctest: +ELLIPSIS
    #...
    sys.argv.insert(1, 'buildout:accept-buildout-test-releases=true')
    print ('NOTE: Accepting early releases of build system packages.  Rerun '
           'bootstrap without --accept-buildout-test-releases (-t) to return to '
           'default behavior.')
    ...

As the note says, to undo, you just need to re-run bootstrap without
--accept-buildout-test-releases.

    >>> ignored = system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py')
    >>> print open(buildout_site_py).read() # doctest: +ELLIPSIS
    "...
        buildout_paths = [
            '/sample/eggs/setuptools-...egg',
            '/sample/eggs/zc.buildout-99.99-pyN.N.egg'
            ]
    ...
    >>> ('buildout:accept-buildout-test-releases=true' in
    ... open(buildout_script).read())
    False

Now we will try the `--version` option, which lets you define a version for
`zc.buildout`. If not provided, bootstrap will look for the latest one.

Let's try with an unknown version::

    >>> print 'XX'; print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --version UNKNOWN'); print 'X' # doctest: +ELLIPSIS
    ...
    X...
    No local packages or download links found for zc.buildout==UNKNOWN...
    ...

Now let's try with `1.1.2`, which happens to exist::

    >>> print 'X'; print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --version 1.1.2'); print 'X'
    ...
    X
    Generated script '/sample/bin/buildout'.
    <BLANKLINE>
    X

Versions older than 1.5.0 put their egg dependencies in the ``buildout`` script.
Let's make sure it was generated as we expect::

    >>> print open(buildout_script).read() # doctest: +ELLIPSIS
    #...
    <BLANKLINE>
    import sys
    sys.path[0:0] = [
      '/sample/eggs/setuptools-...egg',
      '/sample/eggs/zc.buildout-1.1.2...egg',
      ]
    <BLANKLINE>
    import zc.buildout.buildout
    <BLANKLINE>
    if __name__ == '__main__':
        zc.buildout.buildout.main()
    <BLANKLINE>

Let's try with `1.2.1`::

    >>> print 'X'; print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --version 1.2.1'); print 'X' # doctest: +ELLIPSIS
    ...
    X
    Generated script '/sample/bin/buildout'.
    <BLANKLINE>
    X

Let's make sure the generated ``buildout`` script uses it::

    >>> print open(buildout_script).read() # doctest: +ELLIPSIS
    #...
    <BLANKLINE>
    import sys
    sys.path[0:0] = [
      '/sample/eggs/setuptools-...egg',
      '/sample/eggs/zc.buildout-1.2.1...egg',
      ]
    <BLANKLINE>
    import zc.buildout.buildout
    <BLANKLINE>
    if __name__ == '__main__':
        zc.buildout.buildout.main()
    <BLANKLINE>

``zc.buildout`` now can also run with `Distribute` with the `--distribute`
option::

    >>> print 'X'; print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --distribute'); print 'X' # doctest: +ELLIPSIS
    ...
    X
    ...
    Generated script '/sample/bin/buildout'...
    X

Let's make sure the generated ``site.py`` uses it::
    >>> print open(buildout_site_py).read() # doctest: +ELLIPSIS
    "...
        buildout_paths = [
            '/sample/eggs/distribute-...egg',
            '/sample/eggs/zc.buildout-99.99-pyN.N.egg'
            ]
    ...

Make sure both options can be used together::

    >>> print 'X'; print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --distribute --version 1.2.1'); print 'X'
    ... # doctest: +ELLIPSIS
    ...
    X
    ...
    Generated script '/sample/bin/buildout'...
    X

Let's make sure the old-style generated ``buildout`` script uses
``Distribute`` *and* ``zc.buildout-1.2.1``::

    >>> print open(buildout_script).read() # doctest: +ELLIPSIS
    #...
    <BLANKLINE>
    import sys
    sys.path[0:0] = [
      '/sample/eggs/distribute-...egg',
      '/sample/eggs/zc.buildout-1.2.1...egg',
      ]
    <BLANKLINE>
    import zc.buildout.buildout
    <BLANKLINE>
    if __name__ == '__main__':
        zc.buildout.buildout.main()
    <BLANKLINE>

Last, the -c option needs to work on bootstrap.py::

    >>> conf_file = os.path.join(sample_buildout, 'other.cfg')
    >>> f = open(conf_file, 'w')
    >>> f.write('[buildout]\nparts=\n\n')
    >>> f.close()
    >>> print 'X'; print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py -c %s --distribute' % conf_file); print 'X' # doctest: +ELLIPSIS
    ...
    X
    ...
    Generated script '/sample/bin/buildout'...
    X

You can specify a location of ez_setup.py or distribute_setup, so you
can rely on a local or remote location.  We'll write our own ez_setup.py
that we will also use to test some other bootstrap options.

    >>> write('ez_setup.py', '''\
    ... def use_setuptools(**kwargs):
    ...     import sys, pprint
    ...     pprint.pprint(kwargs, width=40)
    ...     sys.exit()
    ... ''')
    >>> print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --setup-source=./ez_setup.py')
    ... # doctest: +ELLIPSIS
    {'download_delay': 0,
     'to_dir': '...'}
    <BLANKLINE>

You can also pass a download-cache, and a place in which eggs should be stored
(they are normally stored in a temporary directory).

    >>> print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --setup-source=./ez_setup.py '+
    ...     '--download-base=./download-cache --eggs=eggs')
    ... # doctest: +ELLIPSIS
    {'download_base': '/sample/download-cache/',
     'download_delay': 0,
     'to_dir': '/sample/eggs'}
    <BLANKLINE>

Here's the entire help text.

    >>> print system(
    ...     zc.buildout.easy_install._safe_arg(sys.executable)+' '+
    ...     'bootstrap.py --help'),
    ... # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
    Usage: [DESIRED PYTHON FOR BUILDOUT] bootstrap.py [options]
    <BLANKLINE>
    Bootstraps a buildout-based project.
    <BLANKLINE>
    Simply run this script in a directory containing a buildout.cfg, using the
    Python that you want bin/buildout to use.
    <BLANKLINE>
    Note that by using --setup-source and --download-base to point to
    local resources, you can keep this script from going over the network.
    <BLANKLINE>
    <BLANKLINE>
    Options:
      -h, --help            show this help message and exit
      -v VERSION, --version=VERSION
                            use a specific zc.buildout version
      -d, --distribute      Use Distribute rather than Setuptools.
      --setup-source=SETUP_SOURCE
                            Specify a URL or file location for the setup file. If
                            you use Setuptools, this will default to
                            http://peak.telecommunity.com/dist/ez_setup.py; if you
                            use Distribute, this will default to http://python-
                            distribute.org/distribute_setup.py.
      --download-base=DOWNLOAD_BASE
                            Specify a URL or directory for downloading zc.buildout
                            and either Setuptools or Distribute. Defaults to PyPI.
      --eggs=EGGS           Specify a directory for storing eggs.  Defaults to a
                            temporary directory that is deleted when the bootstrap
                            script completes.
      -t, --accept-buildout-test-releases
                            Normally, if you do not specify a --version, the
                            bootstrap script and buildout gets the newest *final*
                            versions of zc.buildout and its recipes and extensions
                            for you.  If you use this flag, bootstrap and buildout
                            will get the newest releases even if they are alphas
                            or betas.
      -c CONFIG_FILE        Specify the path to the buildout configuration file to
                            be used.