discourse/config/unicorn_launcher

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