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Developer loses 48 hours to cross-device tempfile bug that broke atomic JSON writes

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A software developer spent 48 hours debugging a silent failure in an atomic file-write helper used to safely update JSON config files. The bug stemmed from Python's os.replace, which is only atomic when the source and destination files reside on the same filesystem device. On a local machine, the default tempfile directory and the target path shared the same device, masking the issue entirely during testing. When deployed to a remote workspace with a different filesystem layout, the cross-device rename caused the operation to fail. The fix was straightforward: passing dir=path.parent to tempfile.mkstemp ensures the temporary file is created on the same device as the destination, keeping the rename truly atomic.

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Developer loses 48 hours to cross-device tempfile bug that broke atomic JSON writes · ShortSingh