rosdep

#!/usr/bin/env python

from rosdep2.main import rosdep_main

import rosdep2
from rosdep2.sources_list import *
from urllib import *
from urllib2 import *

DEFAULT_SOURCES_LIST_URL = 'https://raw.github.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list'
DOWNLOAD_TIMEOUT = 15.0

import urllib2

def download_default_sources_list(url=DEFAULT_SOURCES_LIST_URL):
    """
    Download (and validate) contents of default sources list.

    :param url: override URL of default sources list file
    :return: raw sources list data, ``str``
    :raises: :exc:`InvalidData`
    :raises: :exc:`urllib2.URLError` If data cannot be
        retrieved (e.g. 404, server down).
    """
    try:
        # check for http[s]?_proxy user
        o = urlparse.urlparse(url)
        if os.environ.has_key(o.scheme+'_proxy') :
            proxy = urllib2.ProxyHandler({o.scheme: os.environ[o.scheme+'_proxy']})
            auth = urllib2.HTTPBasicAuthHandler()
            opener = urllib2.build_opener(proxy, auth, urllib2.HTTPHandler)
            urllib2.install_opener(opener)
        f = urlopen(url, timeout=DOWNLOAD_TIMEOUT)
    except (URLError, httplib.HTTPException) as e:
        raise URLError(str(e) + ' (%s)' % url)
    data = f.read().decode()
    f.close()
    if not data:
        raise InvalidSourceFile("cannot download defaults file: empty contents")
    # parse just for validation
    parse_sources_data(data)
    return data

rosdep2.main.download_default_sources_list = download_default_sources_list

rosdep_main()