Rome RSC 2012-03: Develop application and dependent gems, tricking bundler

resync-gems.rb

#!/usr/bin/env ruby

if ARGV[0] == ARGV[1] && $0 =~ /git.*hook/ # Not switching branches
  exit 0
end

require 'rubygems'
require 'bundler'
require 'pathname'

root = Pathname(Dir.getwd)
lock = root.join('Gemfile.lock').read

Bundler::LockfileParser.new(lock).sources.each do |source|
  next unless source.respond_to? :uri
  # If you want to filter on something
  #next unless source.uri =~ /vjt\//

  $stdout.print "[#{source.uri}] "
  $stdout.flush

  rev = source.send(:revision)
  dir = source.uri.scan(/\/([\w_-]+)\.git$/).first.first
  dir = root.join('..', dir)

  Dir.chdir dir

  symbolic_ref = %x{ git describe --all #{rev} }
  symbolic_ref.sub! /^heads\//, ''

  %x{ git checkout #{symbolic_ref} }
  %x{ symlink-gem #{dir} }
end

symlink-gem.sh

#!/bin/bash

geminstall=`gem environment gemdir`
if [ -z "$geminstall" ]; then
  echo 'Cannot find gem installation directory'
  exit -1
fi

gem=$1
if [ -z "$gem" ]; then
  echo "Usage: $0 <gemdir>"
  exit 1
fi

if [ ! -d "$gem" ]; then
  echo "Gem $gem not exist"
  exit 2
fi

cd $gem
dir=`pwd`
name=`basename $dir`

if [ ! -d "$dir/.git" ]; then
  echo "$dir is not a Git repository checkout"
  exit 3
fi

ref=`git describe 2>/dev/null`
ref=`git rev-parse --short=12 ${ref:=HEAD}`

cd $geminstall/bundler/gems
rm -rf $name-*
ln -s $dir $name-$ref