Processing a shell entry.

def process_shell(self, creator, entry, config):
        """Processing a shell entry."""
        self.logger.info("Processing Bash code: start")

        output = []
        shell = creator(entry, config)
        for line in shell.process():
            output.append(line)
            self.logger.info(" | %s", line)

        if shell.success:
            self.logger.info("Processing Bash code: finished")
            return {'success': True, 'output': output}

        for line in self.run_cleanup(config.env, shell.exit_code):
            output.append(line)

        self.logger.error("Pipeline has failed: leaving as soon as possible!")
        self.event.failed()
        return {'success': False, 'output': output}