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LocalHost::write_file truncated the target in place, so a crash, a full disk or a killed process mid-save destroyed the user's file. It now writes a hidden sibling temp file, syncs it, keeps the old file's mode and renames it over the target, removing the temp file on any error. It still writes in place where a rename would change something visible: a non-regular target (symlink, directory, FIFO), a read-only file, and on Unix a hard-linked file or one owned by another user, or when the temp file cannot be created (e.g. a read-only directory).