Short script to keep an updated local copy of Ruby on Rails master branch and run commands using that version rather than a global stable version of the framework.

rails-master

#!/bin/bash

# Keep an updated local copy of Ruby on Rails
# and use it to run commands, rather than the
# version you might have installed as a gem
# on your system
#
# @author ncuesta

# Customize this with your own fork
RAILS_REPO='https://github.com/rails/rails'
# Path to the local copy of Rails
LOCAL_RAILS=~/.rails-master

# Clone or update a local copy of Rails
if [ ! -d $LOCAL_RAILS ]; then
    git clone $RAILS_REPO $LOCAL_RAILS
else
    pushd $LOCAL_RAILS
    git pull
    popd
fi

# Try to run Rails with the given arguments
RAILS=$LOCAL_RAILS/railties/bin/rails

if [ -x $RAILS ]; then
    $RAILS $*
else
    echo "Unable to find Rails executable"
    echo "(Tried at $RAILS)."
    echo "Did the git clone end correctly?"
    exit 1
fi