#!/usr/bin/env bash
# Runs as ExecStartPre of cc-ci-loops.service. Appends ONE line to REBOOTS.md per genuine reboot.
# Uses the kernel boot_id to distinguish a real reboot from a mere `systemctl restart` of the unit:
# only logs when the current boot_id differs from the last one we recorded.
set -u

REBOOTS="/srv/cc-ci/cc-ci-plan/REBOOTS.md"
LAST_BOOT_FILE="/srv/cc-ci/.cc-ci-logs/.last-boot-id"
PHASE_IDX_FILE="/srv/cc-ci/.cc-ci-logs/.phase-idx"

cur_boot="$(cat /proc/sys/kernel/random/boot_id 2>/dev/null || echo unknown)"
last_boot="$(cat "$LAST_BOOT_FILE" 2>/dev/null || echo '')"

# Same boot_id => this is a manual service restart, not a reboot => do nothing.
[ "$cur_boot" = "$last_boot" ] && exit 0

idx="$(cat "$PHASE_IDX_FILE" 2>/dev/null || echo '?')"
ts="$(date '+%Y-%m-%d %H:%M:%S %Z')"
mkdir -p "$(dirname "$LAST_BOOT_FILE")"
printf '%s\n' "- $ts — reboot detected; loops auto-started by systemd (resuming phase index $idx). boot_id=$cur_boot" >> "$REBOOTS" 2>/dev/null || true
echo "$cur_boot" > "$LAST_BOOT_FILE" 2>/dev/null || true
exit 0