docker-certbot-nginx/run.sh

#!/bin/ash

if [ ! -e /etc/letsencrypt/live ]
then
  echo "[!!] Certbot directory is not initialized"
  echo "[!!] Either it's the first run or you forgot to add a volume"

  # check if stdin (fd 0) is assigned to a tty
  [ ! -t 0 ] && echo "Not a TTY! Exiting" && exit 1

  echo "Choose installation method:"
  echo " 1. get certs for hosts specified in nginx.conf"
  echo "    and automatically edit the config (default)"
  echo " 2. get certs for hosts, do not edit the config"
  echo " 3. just launch shell, i'll do it myself"
  read n

  if [ "$n" = 3 ]
  then
    /bin/ash -i
  elif [ "$n" = 2 ]
  then
    /venv/bin/certbot certonly --nginx
  else
    /venv/bin/certbot --nginx
  fi

  exit $?
fi

/usr/sbin/nginx -c /etc/nginx/nginx.conf &
ngpid=$!
waitpid=""

ctrlc () {
  kill -QUIT "$ngpid"
  [ -n "$waitpid" ] && kill -INT "$waitpid"
}

trap ctrlc INT
trap ctrlc TERM

while true
do
  /venv/bin/certbot renew --post-hook "kill -HUP $ngpid"
  sleep 12h &
  waitpid=$!
  wait
done