unicorn init script with rbenv

unicorn

#!/bin/sh
 
### BEGIN INIT INFO
# Provides: unicorn
# Required-Start: $local_fs $remote_fs
# Required-Stop: $local_fs $remote_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: starts unicorn
# Description: starts uniconr using start-stop-daemon
### END INIT INFO
 
set -u
set -e
 
USER=deploy 
APP_NAME=myapp
APP_ROOT="/var/www/$APP_NAME/current"
PID=$APP_ROOT/tmp/pids/unicorn.pid
ENV=production


export RBENV_ROOT=/home/$USER/.rbenv
export PATH="$RBENV_ROOT/bin:$RBENV_ROOT/shims:$PATH"
CMD="bundle exec unicorn -D -E $ENV -c config/unicorn.rb"
 
 
old_pid="$PID.oldbin"
 
cd $APP_ROOT || exit 1
 
sig () {
test -s "$PID" && kill -$1 `cat $PID`
}
 
oldsig () {
test -s $old_pid && kill -$1 `cat $old_pid`
}
 
case $1 in
start)
sig 0 && echo >&2 "Already running" && exit 0
$CMD
;;
stop)
sig QUIT && exit 0
echo >&2 "Not running"
;;
force-stop)
sig TERM && 0
echo >&2 "Not running"
;;
restart|reload)
sig HUP && echo reloaded OK && exit 0
echo >&2 "Couldn't reload, starting '$CMD' instead"
$CMD
;;
upgrade)
sig USR2 && exit 0
echo >&2 "Couldn't upgrade, starting '$CMD' instead"
;;
rotate)
sig USR1 && echo rotated logs OK && exit 0
echo >&2 "Couldn't rotate logs" && 1
;;
*)
echo >&2 "Usage $0 <start|stop|restart|upgrade|rotate|force-stop>"
exit 1
;;
esac