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

source /a/bin/errhandle/err

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

pre="${0##*/}:"
err() { echo "[$(date +'%Y-%m-%d %H:%M:%S%z')]: $pre: $*" >&2; }

## begin check on syncthing
if ! systemctl show --no-page syncthing@ziva | sed -n 's/^MainPID=//p' | egrep '^[0-9]+$' &>/dev/null; then
  err no pid for syncthing@ziva. systemctl status:
  systemctl status syncthing@ziva
fi
## end check on syncthing


## begin check on btrbk
now=$(date +%s)
age_limit_sec=$(( 60 * 60 * 50 )) # 50 hours
for vol in {root,boot}_ubuntubionic; do
  snaps=(/mnt/r7/amy/btrbk/${vol}.20*)
  if [[ ! ${snaps[*]} ]]; then
    err no snapshots starting with /mnt/r7/amy/btrbk/${vol}_ubuntubionic.20
    break
  fi

  read last_snap_sec last_snap < <(
    for s in ${snaps[@]}; do
      f=${s##*/}
      unix_time=$(date -d $(sed -r  's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${f#$vol.}) +%s)
      printf "%s %s\n" $unix_time $s # part of the pipeline
    done | sort -r | head -n 1 ||:
           )
  if [[ ! $last_snap ]]; then
    # should not happen.
    err "could not find latest snapshot for $svp among ${snaps[*]}"
    exit 1
  fi
  if (( last_snap_sec < now - age_limit_sec )); then
    err vol $vol last backup older than 50 hours: $last_snap
  fi
done
## end check on btrbk