`airflow.operators.bash`¶

Module Contents¶

class airflow.operators.bash.BashOperator(*, bash_command: str, env: Optional[Dict[str, str]] = None, output_encoding: str = 'utf-8', **kwargs)[source]¶

Bases: airflow.models.BaseOperator

Execute a Bash script, command or set of commands.

See also

For more information on how to use this operator, take a look at the guide: BashOperator

If BaseOperator.do_xcom_push is True, the last line written to stdout will also be pushed to an XCom when the bash command completes

Parameters

bash_command (str) – The command, set of commands or reference to a bash script (must be ‘.sh’) to be executed. (templated)
env (dict) – If env is not None, it must be a dict that defines the environment variables for the new process; these are used instead of inheriting the current process environment, which is the default behavior. (templated)
output_encoding (str) – Output encoding of bash command

On execution of this operator the task will be up for retry when exception is raised. However, if a sub-command exits with non-zero value Airflow will not recognize it as failure unless the whole shell exits with a failure. The easiest way of achieving this is to prefix the command with set -e; Example:

bash_command = "set -e; python3 script.py '{{ next_execution_date }}'"

Note

Add a space after the script name when directly calling a .sh script with the bash_command argument – for example bash_command="my_script.sh ". This is because Airflow tries to apply load this file and process it as a Jinja template to it ends with .sh, which will likely not be what most users want.

Warning

Care should be taken with “user” input or when using Jinja templates in the bash_command, as this bash operator does not perform any escaping or sanitization of the command.

This applies mostly to using “dag_run” conf, as that can be submitted via users in the Web UI. Most of the default template variables are not at risk.

For example, do not do this:

bash_task = BashOperator(
    task_id="bash_task",
    bash_command='echo "Here is the message: \'{{ dag_run.conf["message"] if dag_run else "" }}\'"',
)

Instead, you should pass this via the env kwarg and use double-quotes inside the bash_command, as below:

bash_task = BashOperator(
    task_id="bash_task",
    bash_command='echo "here is the message: \'$message\'"',
    env={'message': '{{ dag_run.conf["message"] if dag_run else "" }}'},
)

template_fields = ['bash_command', 'env'][source]¶

template_fields_renderers[source]¶

template_ext = ['.sh', '.bash'][source]¶

ui_color = #f0ede4[source]¶

execute(self, context)[source]¶: Execute the bash command in a temporary directory which will be cleaned afterwards

on_kill(self)[source]¶

airflow.operators.bash¶

Module Contents¶

`airflow.operators.bash`¶