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

   1 #!/bin/bash
   2
   3 # We setup kd as a server which runs profanity, because profanity
   4 # contains important state which it does not save to disk: the most
   5 # recent read message in each chat room and for private messages.
   6 # To do this, uses data directories in /d/p.
   7
   8 # However, if we need to take kd down for maintenance, we can run
   9 # profanity on HOST2 with data directory in /p. To do this, stop
  10 # profanity, run prof-backup, and then systemctl start profanity from
  11 # HOST2, and then run prof. To connect from other machines, run prof
  12 # HOST2_SSH_NAME. To have the profanity service stopped and started with
  13 # switch-mail-host, do touch /p/profanity-here. To do the reverse,
  14 #
  15 # systemctl stop profanity
  16 # rsync /p/profanity{,-config} kdwg.b8.nz:/d/p
  17 # ssh root@kdwg.b8.nz systemctl --now enable profanity
  18
  19 if [ -z "$BASH_VERSION" ]; then echo "error: shell is not bash" >&2; exit 1; fi
  20 source /a/bin/errhandle/err
  21
  22 source /a/bin/bash_unpublished/source-state
  23 if [[ $HOSTNAME != "$HOST2" ]]; then
  24   exit 0
  25 fi
  26
  27 case $HOSTNAME in
  28   kd)
  29     if systemctl --quiet is-active profanity; then
  30       rsync /d/p/profanity{,-config} /p
  31     fi
  32     ;;
  33   *)
  34     if ssh b8.nz systemctl --quiet is-active profanity; then
  35       rsync -a b8.nz:/d/p/profanity{,-config} /p
  36     fi
  37     ;;
  38 esac