graceful.sh

#! /bin/bash

set -o pipefail
set -o nounset

service::log() {
  msg="$1"
  timestamp=$(date +"[%m%d %H:%M:%S]")
  printf "+++ %s: %s\n" "${timestamp}" "${msg}" > /dev/stderr
}

service::start() {
  nginx -g "daemon off;"
};

service::stop() {
  service::log "stopping service"
  nginx -s quit;
}

trap service::stop SIGTERM;

service::log "supervisor started with pid '${$}'"
( service::start ) &

while [[ $(jobs  -l | wc -l) != 0 ]]; do
  wait
done

service::log "all children have exited"