unicorn

#!/bin/bash

PATH=/usr/local/rbenv/shims:/usr/local/rbenv/bin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin

NAME=unicorn
RAILS_ENV=${RAILS_ENV:-production}

APP=application_name
EX_USER=www-data
ROOT_DIR="/home/$USER/$APP/current"
PID="${ROOT_DIR}/tmp/pids/unicorn.pid"
CONF="${ROOT_DIR}/config/unicorn/${RAILS_ENV}.rb"

if test "$USER" != "$EX_USER"; then
  echo "please execute by $EX_USER user !!"
  exit 1
fi

start() {
  cd $ROOT_DIR
  if test -e $PID && pgrep -F $PID > /dev/null; then
    echo "$NAME already started";
    exit 1;
  fi
  echo "start $NAME";
  BUNDLE_GEMFILE="${ROOT_DIR}/Gemfile" bundle exec unicorn_rails -c ${CONF} -E ${RAILS_ENV} -D
}

stop() {
  if ! ( test -e $PID && pgrep -F $PID > /dev/null ); then
    echo "$NAME not started";
    exit 1;
  fi
  echo "stop $NAME";
  kill `cat ${PID}`
  rm -f $PID
}

graceful_stop() {
  if ! ( test -e $PID && pgrep -F $PID > /dev/null ); then
    echo "$NAME not started";
    exit 1;
  fi
  echo "stop $NAME";
  kill -QUIT `cat ${PID}`
  rm -f $PID
}

reload() {
  if ! ( test -e $PID && pgrep -F $PID > /dev/null ); then
    echo "$NAME not started";
    start
    exit 0;
  fi
  echo "reload $NAME";
  kill -USR2 `cat ${PID}`
}

restart() {
  if ! ( test -e $PID && pgrep -F $PID > /dev/null ); then
    echo "$NAME not started";
    start
    exit 0;
  fi
  echo "restart $NAME";
  graceful_stop
  start
}

case "$1" in
  start)
    start
    ;;
  stop)
    graceful_stop
    ;;
  force_stop)
    stop
    ;;
  reload)
    reload
    ;;
  restart)
    restart
    ;;
  *)
    echo "Syntax Error: check [start|stop|force_stop|reload|restart]"
    ;;
esac