def run(self):
        """
        try open dockerfile, output an error if there is one
        """
        try:
            return DockerfileParser(self.workflow.builder.df_path).content
        except (__HOLE__, OSError) as ex:
            return "Couldn't retrieve dockerfile: %r" % ex
dataset/ETHPy150Open projectatomic/atomic-reactor/atomic_reactor/plugins/pre_return_dockerfile.py/CpDockerfilePlugin.run