init.d script for starting multiple unicorn-based apps

unicorn.sh

#!/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:      S 0 1 6                                                                                                                          
# Short-Description: unicorn initscript                                                                                                               
# Description:       unicorn                                                                                                                          
### END INIT INFO                                                                                                                                     
                                                                                                                                                      
# Do NOT "set -e"                                                                                                                                     
                                                                                                                                                      
DAEMON=/opt/ruby/bin/unicorn_rails                                                                                                                    
SCRIPT_NAME=/etc/init.d/unicorn                                                                                                                       
                                                                                                                                                      
APPS="app1:env1 app2:env2 app3:env3 app4:env4"                                           
                                                                                                                                                      
case "$1" in                                                                                                                                          
  start)                                                                                                                                              
        for app in $APPS; do                                                                                                                          
                user=`echo $app | cut -d':' -f1`                                                                                                      
                environment=`echo $app | cut -d':' -f2`                                                                                               
                su - $user -c "cd /web/$user/current && bundle exec unicorn_rails -c config/unicorn_$environment.config -E $environment -D"           
        done                                                                                                                                          
        ;;                                                                                                                                            
  restart)                                                                                                                                            
        for app in $APPS; do                                                                                                                          
                user=`echo $app | cut -d':' -f1`                                                                                                      
                kill -USR2 `cat /web/$user/shared/pids/unicorn.pid`                                                                                   
        done                                                                                                                                          
        ;;                                                                                                                                            
  stop)                                                                                                                                               
        for app in $APPS; do                                                                                                                          
                user=`echo $app | cut -d':' -f1`                                                                                                      
                kill -TERM `cat /web/$user/shared/pids/unicorn.pid`                                                                                   
        done                                                                                                                                          
        ;;                                                                                                                                            
  *)                                                                                                                                                  
        echo "Usage: $SCRIPT_NAME {start|stop|restart}" >&2                                                                                           
        exit 3                                                                                                                                        
        ;;                                                                                                                                            
esac