fix: make _safe_write_json actually atomic with mkstemp + os.replace - #3971
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Quratulain-bilal wants to merge 1 commit into
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fix: make _safe_write_json actually atomic with mkstemp + os.replace#3971Quratulain-bilal wants to merge 1 commit into
Quratulain-bilal wants to merge 1 commit into
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Despite its name, _safe_write_json used write_text() which truncates the file before writing. A crash or power loss mid-write leaves a partial JSON file. Now uses tempfile.mkstemp + os.replace for atomic writes, matching the pattern used in _utils.py, shared_infra.py, and other safe-write utilities in the codebase.
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Problem
Despite its name, _safe_write_json used write_text() which truncates the file before writing. A crash or power loss mid-write leaves a partial JSON file. This function is called by _merge_copilot_json, _merge_opencode_plugin_ref, etc., meaning all Copilot and OpenCode event config writes were non-atomic.
Fix
Now uses empfile.mkstemp + os.replace for atomic writes, matching the pattern used in _utils.py, shared_infra.py, and other safe-write utilities in the codebase.