iankelling.org Git - distro-setup/blob - ziva-backup-check

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to switch
   7 # its license to GPL.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23
  24 source /a/bin/bash-bear-trap/bash-bear
  25
  26 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  27
  28 pre="${0##*/}:"
  29 err() { echo "[$(date +'%Y-%m-%d %H:%M:%S%z')]: $pre: $*" >&2; }
  30
  31 ## begin check on syncthing
  32 if ! systemctl show --no-page syncthing@ziva | sed -n 's/^MainPID=//p' | grep -E '^[0-9]+$' &>/dev/null; then
  33   err no pid for syncthing@ziva. systemctl status:
  34   systemctl status syncthing@ziva
  35 fi
  36 ## end check on syncthing
  37
  38
  39 ## begin check on btrbk
  40 age_limit_sec=$(( 60 * 60 * 24 * 7 )) # 7 days.
  41 for prefix in root boot; do
  42   if [[ $prefix == boot ]]; then
  43     # its not uncommon for the /boot subvol to have no changes, and thus
  44     # no new backups for 10 days or so. todo: instead of this error
  45     # prone check, we should make it so the ziva computer will
  46     # touch a file on our computer whenever btrbk succeeds
  47     age_limit_sec=$(( age_limit_sec + 60* 60 * 24 * 35 ))
  48   fi
  49   vol=${prefix}_ubuntubionic
  50   snaps=(/mnt/r7/amy/$prefix/btrbk/${vol}.20*)
  51   if [[ ! ${snaps[*]} ]]; then
  52     err no snapshots starting with /mnt/r7/amy/$prefix/btrbk/${vol}.20
  53     break
  54   fi
  55
  56   read -r last_snap_sec last_snap < <(
  57     for s in ${snaps[@]}; do
  58       f=${s##*/}
  59       unix_time=$(date -d "$(sed -r  's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${f#"$vol".})" +%s)
  60       printf "%s %s\n" $unix_time $s # part of the pipeline
  61     done | sort -r | head -n 1 ||:
  62   )
  63   if [[ ! $last_snap ]]; then
  64     # should not happen.
  65     err "could not find latest snapshot for $vol among ${snaps[*]}"
  66     exit 1
  67   fi
  68   if (( last_snap_sec < EPOCHSECONDS - age_limit_sec )); then
  69     err vol $vol last backup older than 50 hours: $last_snap
  70   fi
  71 done
  72 ## end check on btrbk