app init script

ml

#!/bin/sh
#
# init.d script for single unicorn installation.
#
# This configures a unicorn master for your app at RAILS_ROOT running in
# production mode. It will read config/unicorn.rb for further set up. 
#
# You should ensure different ports or sockets are set in each config/unicorn.rb if
# you are running more than one master concurrently.
#

RUBY_VER=2.0.0-p247
APP=ml
APP_ROOT=/data/$APP/app
APP_ENV=production
APP_USER=$APP
HOME="/data/ml"

PID_FILE=$APP_ROOT/shared/pids/unicorn.pid
OLD_PID_FILE="$PID_FILE.oldbin"

CMD="[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"; cd $APP_ROOT/current; rvm use ruby-$RUBY_VER@$APP; bundle exec unicorn -c $APP_ROOT/current/config/unicorn.rb -E $APP_ENV -D"

set -e
 
sig () {
  test -s "$PID_FILE" && kill -$1 `cat "$PID_FILE"`
}
 
oldsig () {
  test -s "$OLD_PID_FILE" && kill -$1 `cat "$OLD_PID_FILE"`
}
 
cmd () {
  case $1 in
    start)
      sig 0 && echo >&2 "Already running" && exit 0
      echo "Starting"
      su - $APP_USER -c "$CMD"
      ;;  
    stop)
      sig QUIT && echo "Stopping" && exit 0
      echo >&2 "Not running"
      ;;
    force-stop)
      sig TERM && echo "Forcing a stop" && exit 0
      echo >&2 "Not running"
      ;;  
    restart|reload)
      sig USR2 && sleep 5 && oldsig QUIT && echo "Killing old master" `cat $OLD_PID_FILE` && exit 0
      echo >&2 "Couldn't reload, starting '$CMD' instead"
      su - $APP_USER -c "$CMD"
      ;;  
    reexec)
      sig USR2 && echo "Upgraded" && exit 0
      echo >&2 "Couldn't upgrade, starting '$CMD' instead"
      su - $APP_USER -c "$CMD"
      ;;
    stop-old)
      oldsig QUIT && echo "Old master stopped" && exit 0
      echo >&2 "Couldn't stop old master"
      ;;  
    rotate)
      sig USR1 && echo "rotated logs OK" && exit 0
      echo >&2 "Couldn't rotate logs" && exit 1
      ;;  
    add-worker)
      sig TTIN && echo "added one worker" && exit 0
      echo >&2 "Couldn't add worker" && exit 1
      ;;
    del-worker)
      sig TTOU && echo "removed one worker" && exit 0
      echo >&2 "Couldn't remove worker" && exit 1
      ;;
    status)
      if [ -s $PID_FILE ]; then
        ppid=`cat $PID_FILE`
        kill -0 $ppid >/dev/null 2>&1
        if [ "$?" = "0" ]; then
          echo "$APP is running (pid $ppid)"
        else
          echo "$APP is stopped (pidfile is stale)"
        fi
      else
        echo "$APP is stopped (no pidfile)"
      fi
      ;;
    *)  
      echo >&2 "Usage: $0 <status|start|stop|restart|reexec|stop-old|rotate|add-worker|del-worker|force-stop>"
      exit 1
      ;;  
    esac
}
 
echo -n "$APP: "
cmd $1