'Returns AWS credentials defined in the user\'s shell
environment.'

def get_settings_from_env(self, settings):

    found = {}
    for key in settings:
        if (key.upper() in os.environ):
            log.warn(("Setting    '%s'    from    environment..." % key.upper()))
            found[key] = os.environ.get(key.upper())
        elif (key in os.environ):
            log.warn(("Setting    '%s'    from    environment..." % key))
            found[key] = os.environ.get(key)
    return found
