Retrieve latest version of genome resource YAML configuration files.

def _upgrade_genome_resources(galaxy_dir, base_url):
    """Retrieve latest version of genome resource YAML configuration files.
    """
    import requests
    for dbkey, ref_file in genome.get_builds(galaxy_dir):
        # Check for a remote genome resources file
        remote_url = base_url % dbkey
        requests.packages.urllib3.disable_warnings()
        r = requests.get(remote_url, verify=False)
        if r.status_code == requests.codes.ok:
            local_file = os.path.join(os.path.dirname(ref_file), os.path.basename(remote_url))
            if os.path.exists(local_file):
                with open(local_file) as in_handle:
                    local_config = yaml.safe_load(in_handle)
                remote_config = yaml.safe_load(r.text)
                needs_update = remote_config["version"] > local_config.get("version", 0)
                if needs_update:
                    shutil.move(local_file, local_file + ".old%s" % local_config.get("version", 0))
            else:
                needs_update = True
            if needs_update:
                print("Updating %s genome resources configuration" % dbkey)
                with open(local_file, "w") as out_handle:
                    out_handle.write(r.text)