Install (via rbenv) rubies with patches (e.g. for memory profiling)

rbenv-install-with-patches.rb

#!/usr/bin/env ruby

require 'open-uri'
require 'pathname'

PATCH_REPO_BASE_URL = 'https://raw.githubusercontent.com/skaes/rvm-patchsets/master'
PATCH_SET = ARGV[0]
PATCH_RUBY_VERSION = ARGV[1]

raise 'Please specify a patchset (e.g. railsexpress). `ruby-install-with-patches railsexpress 2.2.3`' if PATCH_SET.nil?
raise 'Please specify a ruby version (e.g. 2.2.3). `ruby-install-with-patches railsexpress 2.2.3`' if PATCH_RUBY_VERSION.nil?

TEMP_PATCH_DIR = Pathname.new("/tmp/ruby-install-patches/#{PATCH_RUBY_VERSION}/#{PATCH_SET}")

puts "Downloading patch files to #{TEMP_PATCH_DIR}"
`mkdir -p #{TEMP_PATCH_DIR}`
patch_file_paths = open("#{PATCH_REPO_BASE_URL}/patchsets/ruby/#{PATCH_RUBY_VERSION}/#{PATCH_SET}").read.split("\n").map do |patch|
  patch_url = "#{PATCH_REPO_BASE_URL}/patches/ruby/#{PATCH_RUBY_VERSION}/#{patch}"
  patch_file_path = "#{TEMP_PATCH_DIR}/#{patch.gsub('/','-')}"
  puts "Downloading #{patch} to #{patch_file_path}"
  `curl -s #{patch_url} > #{patch_file_path}`
  patch_file_path
end

puts "Installing ruby with rbenv install (#{`rbenv-install --version`.chomp})"
`cat #{patch_file_paths.join(' ')} | rbenv install -v --patch #{PATCH_RUBY_VERSION}`