Function save_new_pgpass_file 

pub fn save_new_pgpass_file(
    pgpass_idx_lines: Vec<(usize, &str)>,
    updated_conn_params: &ConnectionParams,
    pgpass_path: &Path,
) -> Result<()>

Saves updated PostgreSQL .pgpass to a temporary file, replaces the original, and sets permissions.

Errors

• A filesystem operation (open/read/write/remove) fails.