iankelling.org Git - distro-setup/blob - ziva-screen

   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 # Get screenshots from bow, discard them if they dont change much.
  25
  26 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  27
  28 set -e; . /usr/local/lib/bash-bear; set +e
  29
  30 dest_dir=/d/ziva-log
  31 case $HOSTNAME in
  32   sy)
  33     dest_dir=/t/zlog
  34     ;;
  35 esac
  36
  37 f=/run/user/1000/ziva-tmp.jpg
  38
  39 install -g 1000 -o 1000 -m 700 $dest_dir
  40 cd $dest_dir
  41 shopt -s nullglob
  42 jpgs=( 20*jpg )
  43 if (( ${#jpgs[@]} >= 1 )); then
  44   # shellcheck disable=SC2012 # this is much sorter than find|sort
  45   lastf=$(ls -1 20*jpg  | tail -n1)
  46 fi
  47
  48 ssh bow DISPLAY=:0 scrot -z $f 2>/dev/null || exit 0
  49 rsync --inplace bow:$f $dest_dir 2>/dev/null || exit 0
  50 ssh bow rm -f $f
  51
  52 same=false
  53 if [[ $lastf ]]; then
  54   # returns 2 on error, but maybe in that case we want to ignore, file the image away
  55   # and then it can go away in a subsequent comparison. going with that for now.
  56   diff=$(compare -metric MSE $lastf ziva-tmp.jpg /dev/null |& sed 's/[^0-9].*//') ||:
  57   if printf "%s\n" "$diff" | grep -E '^[0-9]+$' &>/dev/null && (( diff < 200 )); then
  58     same=true
  59   fi
  60 fi
  61
  62 if $same; then
  63   rm -f ziva-tmp.jpg
  64 else
  65   mv ziva-tmp.jpg "$(date +%F.%R)".jpg
  66 fi