Added binaries script which can be used to manage binaries.

It has two commands 'binaries generate' which generates an index of
the binaries in a particular directory.  The other is 'binaries
download' which will download the binaries listed in an index file.

By default 'binaries download' will download the latest versions of
software, but has an option to download all versions.

The requirements.txt file is updated because bin/binaries requires
argparse.  The argparse library is only needed if you plan to use this script.

bin/binaries

@@ -0,0 +1,177 @@
+#!/usr/bin/env python
+
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import sys
+import os
+import json
+import urllib2
+import argparse
+import threading
+
+
+BPDIR = os.path.dirname(os.path.dirname(os.path.abspath(sys.argv[0])))
+
+
+def load_cfg():
+    """Load's the build pack's default options.json file"""
+    return json.load(
+        open(os.path.join(BPDIR, 'defaults', 'options.json'), 'rt'))
+
+
+def run():
+    """Parse the argument in sys.argv and run"""
+    parser = argparse.ArgumentParser(prog='binaries')
+    subparsers = parser.add_subparsers(title='Commands',
+                                       description='List of sub commands',
+                                       help='')
+
+    # generate sub-command --> generates a json index file
+    generate = subparsers.add_parser('generate')
+    generate.add_argument('binary path',
+                          help='The path to the existing binaries')
+    generate.add_argument('--base-url',
+                          help='Override the base URL for packages.  Defaults'
+                               ' to DOWNLOAD_URL from defaults/options.json.')
+
+    def wrap_generate_build_list(args):
+        if args['base-url'] is None:
+            args['base-url'] = load_cfg()['DOWNLOAD_URL']
+        generate_build_list(args['binary path'], args['base-url'])
+
+    generate.set_defaults(func=wrap_generate_build_list)
+
+    # download sub-command --> downloads files listed in json index file
+    download = subparsers.add_parser('download')
+    download.add_argument('binary path',
+                          help='Where to put the binaries')
+    download.add_argument('--index',
+                          help='Override the location for the download index. '
+                               'Defaults to <binary-path>/index.json.')
+    download.add_argument('--latest',
+                          default=True,
+                          help='Only download the latest versions')
+
+    def wrap_download_files(args):
+        if args['index'] is None:
+            args['index'] = os.path.join(args['binary path'], 'index.json')
+        download_files(args['binary path'], args['index'], args['latest'])
+
+    download.set_defaults(func=wrap_download_files)
+
+    # parse the args and run the func for the called sub-command
+    args = parser.parse_args()
+    args.func(vars(args))
+
+
+def safe_makedirs(path):
+    try:
+        os.makedirs(path)
+    except OSError, e:
+        # Ignore if it exists
+        if e.errno != 17:
+            raise e
+
+
+def download(url, toPath):
+    try:
+        res = urllib2.urlopen(url)
+        print 'Downloaded [%s] to [%s]' % (url, toPath)
+        with open(toPath, 'w') as f:
+            f.write(res.read())
+    except IOError, e:
+        if e.code == 404:
+            print 'Failed [%s] not found.' % url
+        else:
+            print 'Failed [%s] [%s] [%s].' % (url, e.code, e.reason)
+
+
+def generate_build_list(binPath, urlBase):
+    """Generate a JSON files with the download URLS for the files in binPath"""
+    bins = {}
+    for package in os.listdir(binPath):
+        if package == 'index.json':
+            continue
+        bins[package] = {}
+        for version in os.listdir(os.path.join(binPath, package)):
+            bins[package][version] = [os.path.join(urlBase,
+                                                   package,
+                                                   version,
+                                                   f)
+                                      for f in os.listdir(
+                                          os.path.join(binPath,
+                                                       package,
+                                                       version))
+                                      if not f.startswith(".")]
+    json.dump(bins, open(os.path.join(binPath, 'index.json'), 'wt'))
+
+
+def get_latest_version(package):
+    """Get the latest version of a package.
+
+    Works by looking in the defaults/config/<package> directory and looking
+    at the versions listed.  It takes the version with the most recent
+    modified time.
+    """
+    cfgDir = os.path.join(BPDIR, 'defaults', 'config', package)
+    dirs = [os.path.join(cfgDir, d) for d in os.listdir(cfgDir)
+            if os.path.isdir(os.path.join(cfgDir, d)) and not d.endswith('x')]
+    return os.path.basename(max(dirs, key=lambda x: os.lstat(x).st_mtime))
+
+
+def download_version(verPath, urls):
+    """Download all the files for a version of a packages.
+
+    Downloads all of the files for a particular version of a package.  Each
+    URL is downloaded in it's own thread, for faster downloads.
+
+    A max of four threads are downloaded at any time.
+    """
+    threads = []
+    for url in urls:
+        toPath = os.path.join(verPath,
+                              os.path.basename(url))
+        while len([t for t in threads if t.is_alive()]) > 4:
+            for thread in threads:
+                thread.join(0.25)
+        t = threading.Thread(target=download,
+                             args=(url, toPath))
+        t.start()
+        threads.append(t)
+    for thread in threads:
+        thread.join()
+
+
+def download_files(binPath, index, latest):
+    """Download the files listed in the JSON index file"""
+    bins = json.load(open(index, 'rt'))
+    safe_makedirs(binPath)
+    for package in bins.keys():
+        pkgPath = os.path.join(binPath, package)
+        safe_makedirs(pkgPath)
+        if not latest:
+            for version in bins[package].keys():
+                verPath = os.path.join(pkgPath, version)
+                safe_makedirs(verPath)
+                download_version(verPath, bins[package][version])
+        else:
+            version = get_latest_version(package)
+            verPath = os.path.join(pkgPath, version)
+            safe_makedirs(verPath)
+            download_version(verPath, bins[package][version])
+
+
+if __name__ == '__main__':
+    run()

requirements.txt

@@ -1,4 +1,5 @@
 Pygments==1.6
+argparse==1.2.1
 dingus==0.3.4
 flake8==2.1.0
 mccabe==0.2.1