Andrew Haigh 087d77adcd Fix loop in too-many-ancestors when an inheritance cycle is inferred (#5062) ... * Add regression test for #4972 hang * Fix loop in too-many-ancestors when an inheritance cycle is inferred Ref #4972. If a class could be inferred as an ancestor of itself then the implementation of _get_parents could get caught in an infinite loop, forever adding itself to to_explore. This could be possible by monkeypatching an ancestor after class definition like in the following simplified example: class Fake(module.Cls): pass module.Cls = Fake Reproducing this is fairly tricky, but this integration test shows the behaviour as of 1e675abcc2aa931421d7ce300908e734a93fd790: #!/bin/sh HERE=$(readlink -f .) VENV=$HERE/venv-repro PIP=$VENV/bin/pip python -m venv "$VENV" PYLINT=$VENV/bin/pylint # assume running in pylint dir $PIP install -e . $PIP install flask mkdir -p repro/flask/ touch repro/__init__.py cat > repro/flask/__init__.py <<'EOF' import flask import repro.flask # self-import necessary class Fake(flask.Flask): pass flask.Flask = Fake EOF echo +++ this is fine $PYLINT --rcfile=/dev/null -- repro/flask/ echo +++ finished echo +++ this loops forever cd repro/; $PYLINT --rcfile=/dev/null -- flask/ echo +++ should not reach here		2021-09-24 18:02:12 +02:00
..
checkers	Fix loop in too-many-ancestors when an inheritance cycle is inferred (#5062)	2021-09-24 18:02:12 +02:00
config	Update toml dependency to >=0.9.2 (#5067)	2021-09-23 19:47:04 +02:00
extensions
lint
message	Fix `useless-suppression for wrong-import-order` (#5063)	2021-09-23 10:18:29 +02:00
pyreverse
reporters
testutils	Refactor and typing of OutputLine (#5060)	2021-09-24 00:27:33 +02:00
utils	Refactor of `FileState.handle_ignored_message()` (#5064)	2021-09-23 08:21:15 +02:00
__init__.py
__main__.py
__pkginfo__.py
constants.py
epylint.py
exceptions.py
graph.py
interfaces.py
typing.py