konqui0 opened a new pull request #6767: [AIRFLOW-6208] Implement fileno in StreamLogWriter URL: https://github.com/apache/airflow/pull/6767 ### Jira - [X] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW-6208) issues and references them in the PR title. ### Description - [X] Here are some details about my PR, including screenshots of any UI changes: Tasks running with the python operator using subprocess.run fail when stdout is redirected to sys.stdout as the StreamLogWriter class does not implement the file descriptor return function fileno() `import sys import os subprocess.run("echo 1", shell=True, check=True, stdout=sys.stdout, stderr=sys.stderr)` `Traceback (most recent call last): File "/usr/lib/python3.8/site-packages/airflow/models/taskinstance.py", line 930, in _run_raw_task result = task_copy.execute(context=context) File "/usr/lib/python3.8/site-packages/airflow/operators/python_operator.py", line 113, in execute return_value = self.execute_callable() File "/usr/lib/python3.8/site-packages/airflow/operators/python_operator.py", line 118, in execute_callable return self.python_callable(*self.op_args, **self.op_kwargs) File "/home/sahas/airflow/dags/subprocess.py", line 39, in sp subprocess.run("echo 1", shell=True, check=True, stdout=sys.stdout, stderr=sys.stderr) File "/usr/lib/python3.8/subprocess.py", line 489, in run with Popen(*popenargs, **kwargs) as process: File "/usr/lib/python3.8/subprocess.py", line 804, in __init__ errread, errwrite) = self._get_handles(stdin, stdout, stderr) File "/usr/lib/python3.8/subprocess.py", line 1487, in _get_handles c2pwrite = stdout.fileno() AttributeError: 'StreamLogWriter' object has no attribute 'fileno'` ### Tests - [X] My PR adds the following unit tests: Added: test_fileno in file tests/utils/test_logging_mixin.py ### 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/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### 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
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