iankelling.org Git - distro-setup/blob - prof-backup

   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 # We setup kd as a server which runs profanity, because profanity
  25 # contains important state which it does not save to disk: the most
  26 # recent read message in each chat room and for private messages.
  27 # To do this, uses data directories in /d/p.
  28
  29 # However, if we need to take kd down for maintenance, we can run
  30 # profanity on HOST2 with data directory in /p. To do this, stop
  31 # profanity, run prof-backup, and then systemctl start profanity from
  32 # HOST2, and then run prof. To connect from other machines, run prof
  33 # HOST2_SSH_NAME. To have the profanity service stopped and started with
  34 # switch-mail-host, do touch /p/profanity-here. To do the reverse,
  35 #
  36 # systemctl stop profanity
  37 # rsync /p/profanity{,-config} kdwg.b8.nz:/d/p
  38 # ssh root@kdwg.b8.nz systemctl --now enable profanity
  39
  40 if [ -z "$BASH_VERSION" ]; then echo "error: shell is not bash" >&2; exit 1; fi
  41 source /a/bin/bash-bear-trap/bash-bear
  42
  43 source /a/bin/bash_unpublished/source-state
  44 if [[ ! $HOSTNAME ]]; then
  45   HOSTNAME=$(cat /etc/hostname)
  46 fi
  47 if [[ $HOSTNAME != "$HOST2" ]]; then
  48   exit 0
  49 fi
  50
  51 case $HOSTNAME in
  52   kd)
  53     if systemctl --quiet is-active profanity; then
  54       rsync /d/p/profanity{,-config} /p
  55     fi
  56     ;;
  57   *)
  58     if ssh iank@b8.nz systemctl --user --quiet is-active profanity; then
  59       rsync -a b8.nz:/d/p/profanity{,-config} /p
  60     fi
  61     ;;
  62 esac