#!/bin/bash
# Switch off boot-time services a headless robot does not use. They cost ~9 s of CPU and a few
# seconds of wall time at every boot, competing with the face for the CPU and the SD card.
# snapd: no snaps are installed. ModemManager: no modems. Run as root. Re-runnable; undo with
# `systemctl unmask ... && systemctl enable ...`.
set -euo pipefail
systemctl disable --now snapd.service snapd.socket snapd.seeded.service snapd.apparmor.service 2>/dev/null || true
systemctl mask snapd.service snapd.socket 2>/dev/null || true
systemctl disable --now ModemManager.service 2>/dev/null || true
echo "trimmed: snapd, ModemManager"