Automatic autorandr change

auto-autorandr.md

autorandr don't auto...

1. Setup directories (Or use whatever you use for crons, but adjust these instructions accordingly)

   mkdir -p $HOME/crons/logs/
   mkdir $HOME/crons/autorandr
   

2. Create script $HOME/crons/autorandr/autorandr-reloader.sh

   #!/usr/bin/env bash
   # autorandr-reloader.sh
   
   function logger2() {
     [[ $1 -eq 0 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;30;41mEMERGENCY\e[0m: ${*:2}"
     [[ $1 -eq 1 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;31;43mALERT\e[0m: ${*:2}"
     [[ $1 -eq 2 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;97;41mCRITICAL\e[0m: ${*:2}"
     [[ $1 -eq 3 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;31mERROR\e[0m: ${*:2}"
     [[ $1 -eq 4 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;33mWARNING\e[0m: ${*:2}"
     [[ $1 -eq 5 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;30;107mNOTICE\e[0m: ${*:2}"
     [[ $1 -eq 6 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;39mINFO\e[0m: ${*:2}"
     [[ $1 -eq 7 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;97;46mDEBUG\e[0m: ${*:2}"
     [[ $1 -eq 9 ]] && echo -e "$(date --utc +"%FT%T.%3NZ") - \e[01;32mSUCCESS\e[0m: ${*:2}"
   }
   
   function rc_handler() {
     if [[ $1 -eq $2 ]] ; then
       logger2 9 $task
     else
       logger2 3 $task - Exit Code: $2
     fi
   }
   function rc() {
     result=$?
     if [[ "$RC_LOG" == "true" ]]; then
       rc_handler "$1" "$result" | tee -a "$LOG_FILE"
     else
       rc_handler "$1" "$result"
     fi
   }
   function et() { echo -e "\n$task..."; }
   
   
   THIS_PID=$$
   function dupe_proc_check() {
     # Ensures this script isn't being run anywhere else on the system.
     PIDS=($(ps -ax -opid,cmd | awk -v this_script="${0##*/}" '$0 ~ this_script && ! /awk/ && ! /sh -c/ && /bash/ {print $1}' | head -n -1))
     for pid in ${PIDS[*]}; do
       if [[ $pid != $THIS_PID ]]; then
         logger2 2 Process is already running with PID $pid! Quitting.
         exit 1
       fi
     done
   }
   
   #trap 'rm -f $pidFile;' EXIT
   function lock_file_handler() {
     # Ensures this scirpt isn't run twice from the same place.
     if [[ $EUID -eq 0 ]]; then
       pidFile="/var/run/${0##*/}.pid.lock"
     else
       pidFile="$HOME/.${0##*/}.pid.lock"
     fi
     
     if [[ -f $pidFile ]]; then
       logger2 2 PID file detected!
       if ps -p $(cat $pidFile) &>/dev/null ; then
         if [[ ! $(ps -p $(cat $pidFile) -o cmd --no-headers) =~ "${0##*/}" ]]; then
           logger2 4 The process matching the pidFile \($(cat $pidFile)\) is NOT ${0##*/}!
           task="Deleting $pidFile"
     logger2 5 $task...
     rm -f $pidFile; rc 0
           logger2 6 Continuing...
         fi
         dupe_proc_check
       fi
     else
       #logger2 6 Creating pidfile $pidFile for pid $$.
       echo $$ > $pidFile
     fi
   }
   
   dupe_proc_check
   lock_file_handler
   
   state_file_a="$HOME/crons/autorandr/.connected.a.state"
   state_file_b="$HOME/crons/autorandr/.connected.b.state"
   
   export DISPLAY=$(w -h $USER | awk '$2 ~ /:[0-9.]*/{print $2}')
   [[ ! -f $state_file_a ]] && echo "$(xrandr -q | grep " connected" | cut -d ' ' -f1 | xargs)" > $state_file_a
   echo "$(xrandr -q | grep " connected" | cut -d ' ' -f1 | xargs)" > $state_file_b
   diff $state_file_a $state_file_b
   if [[ $(diff $state_file_a $state_file_b) ]]; then
     echo "$(xrandr -q | grep " connected" | cut -d ' ' -f1 | xargs)" > $state_file_a
     logger2 5 Configuration change detected! Running autorandr...
     autorandr --change --force
   fi
   if ! autorandr 2>&1 | grep -q "current"; then
     logger2 4 Autorandr config not applied! Retrying...
     autorandr --change --force
   fi
   
   rm -f $pidFile
   

3. Make it executable

   chmod +x $HOME/crons/autorandr/reloader.sh
   

4. Create the crontab entry (crontab -e)

   NOTE: This is how I get crons to run at a higher cadence than supported. Account for proc time if you do this.

   * * * * * /bin/bash -c 'for i in {1..29} ; do $HOME/crons/autorandr/autorandr-reloader.sh | tee -a $HOME/crons/logs/autorandr-reloader.log; sleep 2; done'
   

5. Add this option to the top of /etc/rsyslog.conf to enable support for slashes in the programname.

   NOTE: This rsyslog work is only necessary if you want to silence the gdm-x-session spam in your syslog.

   global(parser.permitSlashInProgramName="on")
   

   REF: https://www.rsyslog.com/doc/v8-stable/configuration/properties.html

6. Add this to the bottom of /etc/rsyslog.conf

   :programname, isequal, "/usr/libexec/gdm-x-session" ~
   

7. Restart rsyslog

   systemctl restart syslog.socket rsyslog.service