docker start script

start.sh

#!/usr/bin/env bash

watch=/tmp/watch
ready=/tmp/ready

rm -f $watch $ready
mkfifo $watch

# reap all on exit
trap "exit" INT TERM
trap "kill 0" EXIT

# spawn app
(
  echo "buildpack=nginx at=start-app cmd='$@'"
  cd api && $@
  echo "app" > $watch
) &

# await app
for ((tries=10; tries>0; tries--)); do
  sleep 1
  echo "buildpack=nginx at=app-initialization"
  [ -f "$ready" ] && break
done

# report status
if [ $tries -eq 0 ]; then
  echo "buildpack=nginx at=app-failed-init"
  exit 1
else
  echo "buildpack=nginx at=app-initialized"
fi

# spawn logger
(
  mkdir -p nginx/logs
  touch nginx/logs/{access,error}.log
  echo "buildpack=nginx at=logs-initialized"
  tail -qF -n 0 nginx/logs/*.log
  echo "logger" > $watch
) &

# spawn nginx (we expect a socket at /tmp/nginx.socket)
(
  erb nginx/nginx.conf.erb > nginx/nginx.conf
  echo "buildpack=nginx at=nginx-start"
  nginx/nginx -p nginx -c nginx.conf
  echo "nginx" > $watch
) &

# watch for termination
read blame < $watch
echo "buildpack=nginx at=exit process=$blame"
exit 1