Stop looking for .gitignore at top level of working tree #20775
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I have a checkout where I'm using the new `exclude_gitignore` facility introduced in python#18696, and where a parent directory has a `.gitignore` file that happens to match the full path of the checkout. I just spent quite some time being very confused about why mypy reported success despite the code having obvious typing errors. Unlike git itself, mypy didn't stop looking for `.gitignore` files at the top level of the working tree; now it does.
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
ilevkivskyi
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Feb 9, 2026
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ilevkivskyi
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OK, if this is how this behaves, we should match that.
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I have a checkout where I'm using the new
exclude_gitignorefacility introduced in #18696, and where a parent directory has a.gitignorefile that happens to match the full path of the checkout. I just spent quite some time being very confused about why mypy reported success despite the code having obvious typing errors. Unlike git itself, mypy didn't stop looking for.gitignorefiles at the top level of the working tree; now it does.