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

# usage: runs 4 times every 15 seconds unless any args are passed, then just runs once

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

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

status_file=/dev/shm/iank-status

shopt -s nullglob
shopt -s dotglob

write-status() {
  chars=()

  glob=(/nocow/btrfs-stale/*)
  if [[ -e $glob ]] ; then
    chars+=("STALE!")
  fi
  glob=(/m/md/bounces/new/*)
  if [[ -e $glob ]]; then
    chars+=("BOUNCE!")
  fi
  glob=(/m/md/alerts/new/* /m/md/alerts/cur/*)
  if [[ -e $glob ]]; then
    chars+=("ALERT!")
  fi
  if [[ -e /nocow/user/mailtest-failure ]]; then
    chars+=("MAILPING!")
  fi
  if [[ -s /var/log/exim4/paniclog ]]; then
    chars+=("PANIC!")
  fi

  source /a/bin/bash_unpublished/source-state
  if [[ $MAIL_HOST == $HOSTNAME ]]; then
    if [[ $(systemctl is-active btrbk.timer) != active ]]; then
      chars+=("BTRBK-TIMER!")
    fi

    ## check if last snapshot was within an hour
    vol=o
    snaps=(/mnt/root/btrbk/$vol.20*)
    now=$(date +%s)
    maxtime=0
    for s in ${snaps[@]}; do
      file=${s##*/}
      t=$(date -d $(sed -r  's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${file#$vol.}) +%s)
      if (( t > maxtime )); then
        maxtime=$t
      fi
    done
    if (( maxtime < now - 60*60 )); then
      chars+=("OLD-SNAPSHOT!")
    fi
  fi

  cat /a/bin/bash_unpublished/source-state >$status_file

  if [[ $chars ]]; then
    echo "ps_char=\"${chars[*]} \$ps_char\"" >>$status_file
  fi

}
write-status
if [[ $@ ]]; then
  cat $status_file
  exit 0
fi
for ((i=1; i<=3; i++)); do
  sleep 15
  write-status
done