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example_bash_operator.py
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example_bash_operator.py
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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
"""Example DAG demonstrating the usage of the BashOperator."""
from __future__ import annotations
import datetime
import pendulum
from airflow.models.dag import DAG
from airflow.operators.bash import BashOperator
from airflow.operators.empty import EmptyOperator
with DAG(
dag_id="example_bash_operator",
schedule="0 0 * * *",
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
dagrun_timeout=datetime.timedelta(minutes=60),
tags=["example", "example2"],
params={"example_key": "example_value"},
) as dag:
run_this_last = EmptyOperator(
task_id="run_this_last",
)
# [START howto_operator_bash]
run_this = BashOperator(
task_id="run_after_loop",
bash_command="echo https://airflow.apache.org/",
)
# [END howto_operator_bash]
run_this >> run_this_last
for i in range(3):
task = BashOperator(
task_id=f"runme_{i}",
bash_command='echo "{{ task_instance_key_str }}" && sleep 1',
)
task >> run_this
# [START howto_operator_bash_template]
also_run_this = BashOperator(
task_id="also_run_this",
bash_command='echo "ti_key={{ task_instance_key_str }}"',
)
# [END howto_operator_bash_template]
also_run_this >> run_this_last
# [START howto_operator_bash_skip]
this_will_skip = BashOperator(
task_id="this_will_skip",
bash_command='echo "hello world {{ params.example_key }}"; exit 99;',
dag=dag,
)
# [END howto_operator_bash_skip]
this_will_skip >> run_this_last
if __name__ == "__main__":
dag.test()