def get_container_version():
root_dir = os.path.dirname(os.path.realpath(sys.argv[<NUM_LIT:0>]))<EOL>version_file = os.path.join(root_dir, '<STR_LIT>')<EOL>if os.path.exists(version_file):<EOL><INDENT>with open(version_file) as f:<EOL><INDENT>return f.read()<EOL><DEDENT><DEDENT>return '<STR_LIT>'<EOL>
Return the version of the docker container running the present server,
    or '' if not in a container