crd-mirror

#!/usr/bin/env bash

###                     Chrome Remote Desktop Mirroring                      ###
# This script launches Chrome Remote Desktop in mirroring mode,                #
# similar to how CRD works on other platforms. Audio is redirected             #
# upon client connection. When client disconnects, the audio is                #
# redirected back to the main sink.                                            #
#                                                                              #
# See crd-mirror.service for launching this script as a systemd user service.  #
###                                                                          ###


CRD=/opt/google/chrome-remote-desktop/chrome-remote-desktop
SUMMARY="Chrome Remote Desktop"

test -n ${DISPLAY} || { echo 'DISPLAY environment variable must be set.'; exit 1; }

start() {
  ${CRD} --check-running && { echo 'Chrome Remote Desktop is already running'; exit 1; }
  ${CRD} --start --mirror ${DISPLAY}
}

on_connect() {
  PULSE_COMMAND=$(grep 'sink_name' ${HOME}/.config/chrome-remote-desktop/pulseaudio*/default.pa)
  SINK_NAME=$(echo ${PULSE_COMMAND} | sed -E 's/^.*sink_name=(\w+).*$/\1/')
  pacmd ${PULSE_COMMAND}
  pacmd set-default-sink ${SINK_NAME}
  # for some reason key repeat is disabled when remote session is connected
  xset r on
}

on_disconnect() {
  pacmd unload-module module-pipe-sink
  xdg-screensaver lock
}

_kill() {
  ${CRD} --stop
}

main() {
  trap _kill EXIT
  while true; do
    test -e ${LOGFILE} || break
    LINE=$(grep -E -m1 "Client (dis)?connected" <(tail -f -n0 ${LOGFILE} --pid ${PID}))
    MESSAGE=$(echo "${LINE}" | sed -E 's/\[.+\] (Client .+: .+)\/.+/\1/')
    notify-send "${SUMMARY}" "${MESSAGE}"
    if [[ ${MESSAGE} =~ " connected" ]] ; then
      on_connect
    elif [[ ${MESSAGE} =~ " disconnected" ]] ; then
      on_disconnect
    fi
  done
}

start
PID=$(pgrep -f chrome-remote-desktop-host)
LOGFILE=/proc/${PID}/fd/1
main