#!/bin/bash # This is a helper script you can use to supervise unicorn, it allows you to perform a live restart # by sending it a USR2 signal LOCAL_WEB="http://127.0.0.1:3000/" function on_exit() { kill $UNICORN_PID echo "exiting" } function on_reload() { echo "Reloading unicorn" kill -s USR2 $UNICORN_PID sleep 10 curl $LOCAL_WEB &> /dev/null NEW_UNICORN_PID=`ps -f --ppid $UNICORN_PID | grep unicorn | grep -v worker | awk '{ print $2 }'` kill $UNICORN_PID echo "Old pid is: $UNICORN_PID New pid is: $NEW_UNICORN_PID" UNICORN_PID=$NEW_UNICORN_PID } export UNICORN_SUPERVISOR_PID=$$ trap on_exit EXIT trap on_reload USR2 HUP unicorn $@ & UNICORN_PID=$! echo "supervisor pid: $UNICORN_SUPERVISOR_PID unicorn pid: $UNICORN_PID" while kill -0 $UNICORN_PID do sleep 1 done