pub fn atomic_write(path: &Path, data: &[u8]) -> CommandResult<()>Expand description
Write data to path atomically: write to a per-write unique temp file,
fsync, then rename onto the target.
The temp name carries a UUID so two concurrent writers of the same path
do not collide on a fixed <path>.tmp. If any step fails the temp file is
best-effort removed so unique temps don’t accumulate on error.
On Unix, the temp file is created with mode 0o600 atomically via
OpenOptions::mode, so it is never world-readable even momentarily. On
Windows no explicit permission change is applied; rely on the directory
ACL to restrict access.