Make mypy cache move truly atomic (Cherry-pick of #19610) #19615
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This change makes the post-mypy-run "moving" of the mypy cache database truly atomic (as claimed in the comment). It does so by checking the device IDs of the source and dest. If they match, `mv` is atomic. Otherwise, `cp` the src into a tmpfile next to the dest, then `mv` into place. Fixes #19609
thejcannon
approved these changes
Aug 16, 2023
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This change makes the post-mypy-run "moving" of the mypy cache database truly atomic (as claimed in the comment).
It does so by checking the device IDs of the source and dest. If they match,
mvis atomic. Otherwise,cpthe src into a tmpfile next to the dest, thenmvinto place.Fixes #19609