diff -r 000000000000 -r 6474c204b198 python/mozboot/bin/bootstrap.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/mozboot/bin/bootstrap.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,152 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This script provides one-line bootstrap support to configure systems to build
+# the tree.
+#
+# The role of this script is to load the Python modules containing actual
+# bootstrap support. It does this through various means, including fetching
+# content from the upstream source repository.
+
+# If we add unicode_literals, optparse breaks on Python 2.6.1 (which is needed
+# to support OS X 10.6).
+from __future__ import print_function
+
+import os
+import shutil
+import sys
+import tempfile
+try:
+    from urllib2 import urlopen
+except ImportError:
+    from urllib.request import urlopen
+
+from optparse import OptionParser
+
+# The next two variables define where in the repository the Python files
+# reside. This is used to remotely download file content when it isn't
+# available locally.
+REPOSITORY_PATH_PREFIX = 'python/mozboot'
+
+REPOSITORY_PATHS = [
+    'mozboot/__init__.py',
+    'mozboot/base.py',
+    'mozboot/bootstrap.py',
+    'mozboot/centos.py',
+    'mozboot/debian.py',
+    'mozboot/fedora.py',
+    'mozboot/freebsd.py',
+    'mozboot/gentoo.py',
+    'mozboot/openbsd.py',
+    'mozboot/osx.py',
+    'mozboot/ubuntu.py',
+]
+
+TEMPDIR = None
+
+def setup_proxy():
+    # Some Linux environments define ALL_PROXY, which is a SOCKS proxy
+    # intended for all protocols. Python doesn't currently automatically
+    # detect this like it does for http_proxy and https_proxy.
+    if 'ALL_PROXY' in os.environ and 'https_proxy' not in os.environ:
+        os.environ['https_proxy'] = os.environ['ALL_PROXY']
+    if 'ALL_PROXY' in os.environ and 'http_proxy' not in os.environ:
+        os.environ['http_proxy'] = os.environ['ALL_PROXY']
+
+def fetch_files(repo_url, repo_type):
+    setup_proxy()
+    repo_url = repo_url.rstrip('/')
+
+    files = {}
+
+    if repo_type == 'hgweb':
+        for path in REPOSITORY_PATHS:
+            url = repo_url + '/raw-file/default/python/mozboot/' + path
+
+            req = urlopen(url=url, timeout=30)
+            files[path] = req.read()
+    else:
+        raise NotImplementedError('Not sure how to handle repo type.', repo_type)
+
+    return files
+
+def ensure_environment(repo_url=None, repo_type=None):
+    """Ensure we can load the Python modules necessary to perform bootstrap."""
+
+    try:
+        from mozboot.bootstrap import Bootstrapper
+        return Bootstrapper
+    except ImportError:
+        # The first fallback is to assume we are running from a tree checkout
+        # and have the files in a sibling directory.
+        pardir = os.path.join(os.path.dirname(__file__), os.path.pardir)
+        include = os.path.normpath(pardir)
+
+        sys.path.append(include)
+        try:
+            from mozboot.bootstrap import Bootstrapper
+            return Bootstrapper
+        except ImportError:
+            sys.path.pop()
+
+            # The next fallback is to download the files from the source
+            # repository.
+            files = fetch_files(repo_url, repo_type)
+
+            # Install them into a temporary location. They will be deleted
+            # after this script has finished executing.
+            global TEMPDIR
+            TEMPDIR = tempfile.mkdtemp()
+
+            for relpath in files.keys():
+                destpath = os.path.join(TEMPDIR, relpath)
+                destdir = os.path.dirname(destpath)
+
+                if not os.path.exists(destdir):
+                    os.makedirs(destdir)
+
+                with open(destpath, 'wb') as fh:
+                    fh.write(files[relpath])
+
+            # This should always work.
+            sys.path.append(TEMPDIR)
+            from mozboot.bootstrap import Bootstrapper
+            return Bootstrapper
+
+def main(args):
+    parser = OptionParser()
+    parser.add_option('-r', '--repo-url', dest='repo_url',
+        default='https://hg.mozilla.org/mozilla-central/',
+        help='Base URL of source control repository where bootstrap files can '
+             'be downloaded.')
+
+    parser.add_option('--repo-type', dest='repo_type',
+        default='hgweb',
+        help='The type of the repository. This defines how we fetch file '
+             'content. Like --repo, you should not need to set this.')
+
+    options, leftover = parser.parse_args(args)
+
+    try:
+        try:
+            cls = ensure_environment(options.repo_url, options.repo_type)
+        except Exception as e:
+            print('Could not load the bootstrap Python environment.\n')
+            print('This should never happen. Consider filing a bug.\n')
+            print('\n')
+            print(e)
+            return 1
+
+        dasboot = cls()
+        dasboot.bootstrap()
+
+        return 0
+    finally:
+        if TEMPDIR is not None:
+            shutil.rmtree(TEMPDIR)
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))