wait_for_x11_init.sh

#!/usr/bin/env bash

# Exit when a command fails
set -o errexit
# Exit on undeclared variable
set -o nounset
# Exit on the first command in pipe fail
set -o pipefail

echo -n "Waiting for X11 to initialize..."
while ! xdpyinfo -display "${DISPLAY}" >/dev/null 2>&1; do
  echo -n "."
  sleep 0.50s
done
echo "Done - X11 is ready!"