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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2026, Google LLC.
# Check persistent backup instance across guest crash/reboot
# REBOOT: 1
TRACEDIR="/sys/kernel/tracing"
# Ensure both boot_map/trace and backup/trace files exist
if [ ! -f "$TRACEDIR/instances/boot_map/trace" ]; then
echo "FAIL: boot_map/trace file missing"
exit 1
fi
if [ ! -f "$TRACEDIR/instances/backup/trace" ]; then
echo "FAIL: backup/trace file missing"
exit 1
fi
# Check if BOOT1_MARKER is in boot_map/trace (indicates second boot)
if grep -q "BOOT1_MARKER" "$TRACEDIR/instances/boot_map/trace" 2>/dev/null; then
# Second boot: verify BOOT1_MARKER was copied into backup/trace from Boot 1
if grep -q "BOOT1_MARKER" "$TRACEDIR/instances/backup/trace" 2>/dev/null; then
echo "PASS: persistent-02-backup-instance"
exit 0
else
echo "FAIL: BOOT1_MARKER found in boot_map/trace" \
"but missing from backup/trace on second boot"
exit 1
fi
fi
# First boot: write BOOT1_MARKER to boot_map and reboot via sysrq-trigger
echo "BOOT1_MARKER" > "$TRACEDIR/instances/boot_map/trace_marker"
sync
# Trigger reboot to restart into second boot
echo b > /proc/sysrq-trigger 2>/dev/null || echo c > /proc/sysrq-trigger 2>/dev/null || true
sleep 5
echo "FAIL: reboot trigger failed on first boot"
exit 1
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