#!/bin/bash
# Copyright (C) 2019 Ian Kelling
# SPDX-License-Identifier: AGPL-3.0-or-later

# The panic log regularly gets some stuff in it we dont want to fix.
# Detect it and wipe it out.

if [ -z "$BASH_VERSION" ]; then echo "error: shell is not bash" >&2; exit 1; fi

shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

[[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"

if [[ ! -s /var/log/exim4/paniclog ]]; then
  exit 0
fi

wipe=false
while read -r d1 d2; do
  tmptime=$(date -d "$d1 $d2" +%s)
  # dont consider every matching line, just those in > 60 second intervals
  if [[ ! $logtime ]]; then
    logtime=$tmptime
  elif (( tmptime > logtime + 60 )); then
    logtime=$tmptime
  else
    continue
  fi
  sec_min=$((logtime - 60))
  sec_max=$((logtime + 60))
  jmin="$(date -d @$sec_min "+%F %H:%M:%S")"
  jmax="$(date -d @$sec_max "+%F %H:%M:%S")"
  if journalctl -S "$jmin" -U "$jmax" \
      | awk '$6 == "spamd:" && $7 == "restarting"' | grep . &>/dev/null; then
    wipe=true
    break
  fi
done < <(awk '/spam acl condition/ {print $1,$2}' /var/log/exim4/paniclog)
if $wipe; then
  regex="^$(date -d @$logtime "+%F %H:%M" )|^${jmin%:*}|^${jmax%:*}"
  grep -E "$regex" /var/log/exim4/paniclog >> /var/log/exim4/paniclog-archive
  sed -ri "/$regex/d" /var/log/exim4/paniclog
fi