RVM wrapper that loads needed environment in CRON tasks

rvm_env_wrapper.sh

#!/usr/bin/env bash
# usage
# rvm_env_wrapper /path/to/project some_ruby_file.rb
# rvm_env_wrapper /path/to/project some_comand arg1 arg2 arg3 etc
# OR
# rvm_env_wrapper --use ruby_version@gemset_name some_comand_or_file
# Permissions:
# sudo chown user:group rvm_env_wrapper
# sudo chmod 774 rvm_env_wrapper
#
export HOME=/home/user
export RAILS_ENV=production
# Load RVM into a shell session *as a function*
if [[ -s "$HOME/.rvm/scripts/rvm" ]] ; then
  source "$HOME/.rvm/scripts/rvm"
else
  echo "ERROR: An RVM installation was not found." 1>&2
  exit -1
fi
if [[ -d "$1" ]] ; then
  # Control will enter here if $1 (app directory) exists.
  APP_DIR=$1
  shift
  # Load RVM environment for the app
  cd $APP_DIR
elif [ "$1" == "--use" ]; then
  shift
  rvm use $1
  shift
else
  echo "Usage:"
  echo "$0 PROJECT_DIR_PATH[or --use ruby-version@gemset] [args*]"
  echo "ERROR: wrong usage" 1>&2
  exit -1
fi
if [ $# -gt 0 ]; then
  $*
fi