Function atomic_write 

pub async fn atomic_write(path: &Path, data: &[u8]) -> Result<()>

Write data to path atomically by writing to a temporary sibling file and then renaming it into place.

The temp file is created in the same directory as path to guarantee same-filesystem rename semantics.

Errors

Returns an error if:

• The parent directory of path does not exist.
• The temp file cannot be created or written.
• The rename operation fails.