import os
import platform

import sau.errors
import sau.freebsd
import sau.gentoo

def get_platform():
    platform_mod = None
    if platform.system() == 'FreeBSD':
        platform_mod = sau.freebsd
    elif platform.system() == 'Linux':
        if os.path.exists('/usr/bin/emerge'):
            platform_mod = sau.gentoo


    if not platform_mod:
        raise sau.errors.PlatformNotSupported("System: {} Release: {} Version: {} is not supported".format(
            platform.system(),
            platform.release(),
            platform.version()))
    return platform_mod