Opened 12 months ago

Last modified 3 months ago

#35308 closed Cleanup/optimization

FileNotFoundError escapes from run_formatters() — at Initial Version

Reported by: Jacob Walls Owned by: nobody
Component: Core (Management commands) Version: dev
Severity: Normal Keywords: black, code formatting
Cc: Jeetu Singh Triage Stage: Ready for checkin
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Two members of my team have now run into ​this issue described on the Django forum.

In essence, it's not safe to assume that just because shutil.which("black") returns a path that subprocess.run() can execute that path.

Some ​complications with shutil.which(..., path=None):

  • Reads a path variable from one or two fallbacks (either os.environ() or os.defpath)
  • Behavior is different on Windows
  • Behavior is different on Windows with Python 3.12.0
  • Behavior is different on Windows with Python 3.12.1

My impression of the feature was that it was aiming at a frictionless experience -- format if you have a working black install, don't if you don't.

Suggesting we should catch FileNotFoundError (at least) and at most log out an explanation why the file wasn't formatted. Users who only have a copy of black in abandoned environments are unlikely to care about their files not being formatted. :-)

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