start_installation.sh

start_installation.sh

#!/bin/bash

# Launch and installation and its subprocesses. If the subprocesses
# go down, re-launch them individually. If this script receives a 
# shutdown signal (Ctrl-c, etc...), kill the child processes.

function on_exit() {
	kill $BACKEND_PID $FRONTEND_PID
	exit 0
}

function start_backend() {
	cd backend 
	# maybe you wrote a python backend
	python server.py &
	BACKEND_PID=$!
	cd - 
}

function start_frontend() {
	cd frontend
	# maybe you wrote an electron frontend w/ a fancy npm start script
	npm start &
	FRONTEND_PID=$!
	cd -
}

# put your ENV vars here. For instance, I like to crush
# it on my GTX1080Ti
export CUDA_VISIBLE_DEVICES=0

# fire on_exit when these signals are caught
trap on_exit INT TERM EXIT 

while true ; do
	
	if ! $(kill -0 "$FRONTEND_PID" > /dev/null 2>&1) ; then
		echo "the frontend quit, re-launching"
		start_frontend
	fi

	if ! $(kill -0 "$BACKEND_PID" > /dev/null 2>&1) ; then
		echo "the backend quit, re-launching"
		start_backend
	fi

	sleep 1

done