def _linux_distribution()

in awscli/compat.py [0:0]

• 43 lines of code
• 6 McCabe index (conditional complexity)

    def _linux_distribution(distname, version, id, supported_dists,
                            full_distribution_name):

        """ Tries to determine the name of the Linux OS distribution name.
            The function first looks for a distribution release file in
            /etc and then reverts to _dist_try_harder() in case no
            suitable files are found.
            supported_dists may be given to define the set of Linux
            distributions to look for. It defaults to a list of currently
            supported Linux distributions identified by their release file
            name.
            If full_distribution_name is true (default), the full
            distribution read from the OS is returned. Otherwise the short
            name taken from supported_dists is used.
            Returns a tuple (distname, version, id) which default to the
            args given as parameters.
        """
        # check for the Debian/Ubuntu /etc/lsb-release file first, needed so
        # that the distribution doesn't get identified as Debian.
        # https://bugs.python.org/issue9514
        try:
            with open("/etc/lsb-release", "r") as etclsbrel:
                for line in etclsbrel:
                    m = _distributor_id_file_re.search(line)
                    if m:
                        _u_distname = m.group(1).strip()
                    m = _release_file_re.search(line)
                    if m:
                        _u_version = m.group(1).strip()
                    m = _codename_file_re.search(line)
                    if m:
                        _u_id = m.group(1).strip()
                if _u_distname and _u_version:
                    return (_u_distname, _u_version, _u_id)
        except (EnvironmentError, UnboundLocalError):
                pass

        try:
            etc = os.listdir(_UNIXCONFDIR)
        except OSError:
            # Probably not a Unix system
            return distname, version, id
        etc.sort()
        for file in etc:
            m = _release_filename.match(file)
            if m is not None:
                _distname, dummy = m.groups()
                if _distname in supported_dists:
                    distname = _distname
                    break
        else:
            return _dist_try_harder(distname, version, id)

        # Read the first line
        with open(os.path.join(_UNIXCONFDIR, file), 'r',
                  encoding='utf-8', errors='surrogateescape') as f:
            firstline = f.readline()
        _distname, _version, _id = _parse_release_file(firstline)

        if _distname and full_distribution_name:
            distname = _distname
        if _version:
            version = _version
        if _id:
            id = _id
        return distname, version, id