#!/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 log() { echo "($$) $1" } function on_exit() { kill $UNICORN_PID log "exiting" } function on_reload() { log "Reloading unicorn ($UNICORN_PID)" kill -s USR2 $UNICORN_PID unset NEW_UNICORN_PID count=0 while [ "$count" -lt 30 -a -z "$NEW_UNICORN_PID" ]; do NEW_UNICORN_PID=`ps -f --ppid $UNICORN_PID | grep 'unicorn master' | grep -v old | grep -v worker | awk '{ print $2 }'` log "Waiting for new unicorn master pid... $NEW_UNICORN_PID" count=$((count+1)) sleep 1 done count=0 while [ "$count" -lt 30 -a -z "$(ps -f --ppid $NEW_UNICORN_PID | grep worker | head -1 | awk '{ print $2 }')" ]; do log "Waiting for new unicorn workers under $NEW_UNICORN_PID to start up..." count=$((count+1)) sleep 1 done curl $LOCAL_WEB &> /dev/null kill -s QUIT $UNICORN_PID log "Old pid is: $UNICORN_PID New pid is: $NEW_UNICORN_PID" UNICORN_PID=$NEW_UNICORN_PID } function on_reopenlogs() { log "Reopening logs" kill -s USR1 $UNICORN_PID } export UNICORN_SUPERVISOR_PID=$$ trap on_exit EXIT trap on_reload USR2 HUP trap on_reopenlogs USR1 unicorn $@ & UNICORN_PID=$! echo "supervisor pid: $UNICORN_SUPERVISOR_PID unicorn pid: $UNICORN_PID" while kill -0 $UNICORN_PID do sleep 1 done