#!/bin/sh
# Rotate /var/log/5g-router.log (keep last 5 copies, max 1MB each)
# Run from cron daily: 0 3 * * * /usr/local/bin/rotate-5g-log.sh
# Alpine does not ship logrotate by default; this is a minimal alternative.
# Rev: 1  (see REVISION in repo root)

LOG="/var/log/5g-router.log"
MAXSIZE=$((1024 * 1024))  # 1MB
KEEP=5

[ ! -f "$LOG" ] && exit 0
size=$(stat -c %s "$LOG" 2>/dev/null) || size=$(wc -c < "$LOG" 2>/dev/null) || exit 0
[ "$size" -lt "$MAXSIZE" ] && exit 0

for i in $(seq $((KEEP - 1)) -1 1); do
    [ -f "${LOG}.$i" ] && mv "${LOG}.$i" "${LOG}.$((i+1))"
done
[ -f "${LOG}.1" ] && mv "${LOG}.1" "${LOG}.2"
mv "$LOG" "${LOG}.1"
touch "$LOG"
chmod 644 "$LOG" 2>/dev/null || true