#!/bin/sh

# Overview of how this script works: http://veithen.io/2014/11/16/sigterm-propagation.html
# Set a trap to kill the main app process when this
# init script receives SIGTERM or SIGINT
trap 'kill -s TERM $PID' TERM INT
# Execute the main application in the background
"$@" &
PID=$!
# wait command always terminates when trap is caught, even if the process hasn't finished yet
wait $PID
# Remove the trap and wait till the app process finishes completely
trap - TERM INT
# We wait again, since the first wait terminates when trap is caught
wait $PID
# Exit with the exit code of the app process
STATUS=$?
exit $STATUS