unicorn init script with rbenv

gistfile1.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:      0 1 6
# Short-Description: starts unicorn
# Description:       starts uniconr using start-stop-daemon
### END INIT INFO

set -u
set -e

export PATH=/path/to/rbenv/bin:$PATH
export RBENV_DIR=/path/to/rbenv
export RBENV_ROOT=/path/to/rbenv

APP_ROOT=/path/to/rack_app/root
PID=$APP_ROOT/tmp/pids/unicorn.pid
RAILS_ENV=production

export PATH="$RBENV_ROOT/shims:$RBENV_ROOT/rbenv:$PATH"
CMD="bundle exec $RBENV_ROOT/shims/unicorn -D -E $RAILS_ENV -c config/unicorn/$RAILS_ENV.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