http://stackoverflow.com/questions/27893425/su-user-p-c-cmd-not-accessing-path

unicorn-debug

root@vagrant-ubuntu-trusty-64:~# sh -x /etc/init.d/unicorn start
+ set -e
+ USAGE=Usage: /etc/init.d/unicorn <start|stop|restart|upgrade|rotate|force-stop>
+ USER=vagrant
+ APP_NAME=safir
+ APP_ROOT=/vagrant
+ RAILS_ENV=production
+ export RBENV_ROOT=/home/vagrant/.rbenv
+ export PATH=/home/vagrant/.rbenv/bin:/home/vagrant/.rbenv/shims:/home/vagrant/.rbenv/bin:/home/vagrant/.rbenv/shims:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ SET_RUBY=cd /vagrant && rbenv rehash && rbenv local 2.2.0
+ CMD=cd /vagrant && rbenv rehash && rbenv local 2.2.0;bundle exec unicorn -c config/unicorn.rb -E production -D
+ PID=/vagrant/tmp/pids/unicorn.pid
+ OLD_PID=/vagrant/tmp/pids/unicorn.pid.oldbin
+ cd /vagrant
+ sig 0
+ test -s /vagrant/tmp/pids/unicorn.pid
+ echo Starting safir
Starting safir
+ su - vagrant -c echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games

unicorn.sh

#!/bin/sh

### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $all
# Required-Stop:     $all
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts the unicorn app server
# Description:       starts unicorn using start-stop-daemon
### END INIT INFO

set -e

USAGE="Usage: $0 <start|stop|restart|upgrade|rotate|force-stop>"

# app settings
USER="vagrant"
APP_NAME="safir"
APP_ROOT="/vagrant"
RAILS_ENV="production"

export RBENV_ROOT="/home/$USER/.rbenv"

# environment settings
export PATH=$RBENV_ROOT/bin:$RBENV_ROOT/shims:$PATH
SET_RUBY="cd $APP_ROOT && rbenv rehash && rbenv local 2.2.0"
CMD="$SET_RUBY;bundle exec unicorn -c config/unicorn.rb -E $RAILS_ENV -D"
PID="$APP_ROOT/tmp/pids/unicorn.pid"
OLD_PID="$PID.oldbin"

# make sure the app exists
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
    echo "Starting $APP_NAME"
    su - $USER -c 'echo $PATH'
    #su - $USER -c "PATH=$PATH; $CMD"
    ;;
  stop)
    echo "Stopping $APP_NAME"
    sig QUIT && exit 0
    echo >&2 "Not running"
    ;;
  force-stop)
    echo "Force stopping $APP_NAME"
    sig TERM && exit 0
    echo >&2 "Not running"
    ;;
  restart|reload|upgrade)
    sig USR2 && echo "reloaded $APP_NAME" && exit 0
    echo >&2 "Couldn't reload, starting '$CMD' instead"
    $CMD
    ;;
  rotate)
    sig USR1 && echo rotated logs OK && exit 0
    echo >&2 "Couldn't rotate logs" && exit 1
    ;;
  status)
    sig 0 && echo >&2 "Already running" && return
    echo >&2 "Not running" && return
    ;;
  *)
    echo >&2 $USAGE
    exit 1
    ;;
esac