clipboardsync

#!/bin/bash
#this script uses xsel to synchronize the clipboards of the host X server and the guest's Xephyr window.

errorexit(){
  echo $1
  exit 1
}

[ ! -f /usr/bin/xsel ] && errorexit "xsel not installed!"

hostdisplay=':0'
guestdisplay=':1'

while ! xsel --display $guestdisplay -b -o &>/dev/null;do
  sleep 1
done
echo "Guest X server started. Running..."

#update guest's clipboard at startup
xsel --display $hostdisplay -b -o | xsel --display $guestdisplay -b -i

guestprevclip="$(xsel --display $guestdisplay -b -o)"
hostprevclip="$(xsel --display $hostdisplay -b -o)"

while true;do
  xsel --display $guestdisplay -b -o &>/dev/null || exit 0
  xsel --display $hostdisplay -b -o &>/dev/null || exit 0
  guestcurclip="$(xsel --display $guestdisplay -b -o)"
  hostcurclip="$(xsel --display $hostdisplay -b -o)"
  
  #if host's clipboard was changed this time
  if [ "$hostcurclip" != "$hostprevclip" ];then
    #update the guest's clipboard
    xsel --display $hostdisplay -b -o | xsel --display $guestdisplay -b -i
    
    #if guest's clipboard was changed this time
  elif [ "$guestcurclip" != "$guestprevclip" ];then
    #update the host's clipboard
    xsel --display $guestdisplay -b -o | xsel --display $hostdisplay -b -i
  fi
  
  #shift register
  guestprevclip="$guestcurclip"
  hostprevclip="$hostcurclip"
  
  #wait a bit between each loop sequence
  sleep 0.1
done