ashb commented on issue #3939: [AIRFLOW-3104] Add .airflowignore info into doc URL: https://github.com/apache/incubator-airflow/pull/3939#issuecomment-424641567 So extra thing about this - every directory is checked for an `.airflowignore`. I.e. ``` $ find dags -type f dags/.airflowignore dags/x_ignored.py dags/y_not_ignored.py dags/ignored_dir/this/whole/path/is/not/even/walked dags/lib/.airflowignore dags/lib/x_ignored.py dags/lib/y_ignored.py $ cat dags/..airflowignore ignored_dir$ x_.*\.py $ cat dags/libs/.airflowignore y_.*\.py ``` Though I've done this from memory (and sadly didn't write tests when I fixed the behaviour. Bad Ash) so a quick check I've said the right thing would be good. The key points being that the patterns are also checked against directories (and if a dir is ignored then we don't do an `os.walk` in to it, which can speed up things) and that patterns from a parent folder are also checked against the contents of sub folders..
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