jml opened a new pull request #5757: [AIRFLOW-5100] Use safe_mode configuration setting by default URL: https://github.com/apache/airflow/pull/5757 The scheduler calls `list_py_file_paths` to find DAGs to schedule. It does so without passing any parameters other than the directory. This means that it *won't* discover DAGs that are missing the words "airflow" and "DAG" even if DAG_DISCOVERY_SAFE_MODE is disabled. Since `list_py_file_paths` will refer to the configuration if `include_examples` is not provided, it makes sense to have the same behaviour for `safe_mode`. Make sure you have checked _all_ steps below. ### Jira - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR" ### Description See above. There are no UI changes. ### Tests I stared at the code a long time and couldn't figure out a good place to test. - `list_py_file_paths` doesn't have direct tests - adding a test for this particular branch might be OK, but feels a bit like a [change detector test](https://testing.googleblog.com/2015/01/testing-on-toilet-change-detector-tests.html) - If you can point me to a context manager to temporarily override a configuration setting, I could probably write some direct tests that use `tests/dags/` as the source of DAGs - `SchedulerJob` is actually exhibiting the bug, and is where the behaviour needs to be correct - There's no obvious API to exercise that would let me test this - I could theoretically extract a `_make_processor_agent` from `_execute`, and assert things about its return value, but I don't want spend time on that without a core contributor approving it first - I would still need a context manager to temporarily override configuration settings ### Commits - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)" ### Documentation - [x] In case of new functionality, my PR adds documentation that describes how to use it. - All the public functions and the classes in the PR contain docstrings that explain what it does - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release ### Code Quality - [x] Passes `flake8`
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