#!/bin/sh
# prerm — deb pre-removal (spec §7).
#
# dpkg calls: prerm remove  (package being removed)
#             prerm upgrade  (old version about to be replaced)
set -eu

# Detect init system
if [ -d /run/systemd/system ] || [ "$(cat /proc/1/comm 2>/dev/null)" = "systemd" ]; then
    INIT_SYSTEM="systemd"
else
    INIT_SYSTEM="runit"
fi

case "${1:-}" in
    remove)
        # Sanctioned disable — close monitoring period (spec §7)
        if [ -x /usr/libexec/fenris/fenris-monitor ]; then
            /usr/libexec/fenris/fenris-monitor disable --now 2>/dev/null || true
        fi
        if [ "${INIT_SYSTEM}" = "systemd" ]; then
            systemctl stop fenris-collect.timer 2>/dev/null || true
            systemctl disable fenris-collect.timer 2>/dev/null || true
        else
            # runit: remove the service symlink
            rm -f /var/service/fenris-collect
            touch /etc/sv/fenris-collect/down 2>/dev/null || true
        fi
        ;;
    upgrade)
        # Never interrupt monitoring on upgrade
        ;;
esac