Function pacsea_sudo_timestamp_drop_in_present 

pub fn pacsea_sudo_timestamp_drop_in_present() -> bool

What: Detect whether the suggested Pacsea drop-in is already present and readable.

Inputs:

• None; reads SUDOERS_DROP_IN_PATH from disk.

Output:

• true when the file is readable and mentions our marker and timestamp_timeout.

Details:

• Best-effort only: unreadable paths (permission denied) yield false.