Run an X application as a different user, with some sound working

ubin

#!/usr/bin/env bash

die() {
  echo "$*"
  exit 1
}

turnoff_xhost() {
  xhost - >/dev/null 2>&1
}

audio_user() {
  local user="$1"; shift 
  if ! (groups "$user" | grep -e "\baudio\b" -q); then
    echo "Adding $user to audio group."
    echo "Password for $(whoami)"
    sudo gpasswd -a "$user" audio || echo "Audio enablement problem - audio may not work"
  fi
}

checkvar() {
  local var="$1"; shift 
  [[ -n "$var" ]] || die "$* not specified"
}

main() {
  if [[ "$WAITING_MODE" = true ]]; then
    user="$1"; shift || {
      echo "Specify the user to run as !"
    }

    trap turnoff_xhost exit
    sudo -u "$user" -i "$@" >/dev/null 2>&1
  else
    checkvar "$1" user
    checkvar "$2" program

    audio_user "$1"
    xhost + >/dev/null 2>&1 || die "Could not adjust xhost"

    WAITING_MODE=true "$0" "$@" & 
  fi
}

main "$@"