Added a .travis.yml config and travis specific ci script.

Don't install ruby-debug if running the test suite on Travis,
linecache19 is the main offender, very very slow.

And do not install pg if Travis is bundling the gems, pg will be setup
on Travis soon.

.travis.yml

@@ -0,0 +1,12 @@
+script: 'ci/travis.rb'
+notifications:
+  disabled: true
+rvm:
+  - 1.8.7
+  - 1.9.2
+env:
+  - "GEM=railties"
+  - "GEM=ap,am,amo,ares,as"
+  - "GEM=ar:mysql"
+  - "GEM=ar:mysql2"
+  - "GEM=ar:sqlite3"

Gemfile

@@ -31,13 +31,13 @@ gem "memcache-client", ">= 1.8.5"
 
 platforms :mri_18 do
   gem "system_timer"
-  gem "ruby-debug", ">= 0.10.3"
+  gem "ruby-debug", ">= 0.10.3" unless ENV['TRAVIS']
   gem "json"
 end
 
 platforms :mri_19 do
   # TODO: Remove the conditional when ruby-debug19 supports Ruby >= 1.9.3
-  gem "ruby-debug19", :require => "ruby-debug" if RUBY_VERSION < "1.9.3"
+  gem "ruby-debug19", :require => "ruby-debug" unless RUBY_VERSION > "1.9.2" || ENV['TRAVIS']
 end
 
 platforms :ruby do
@@ -56,7 +56,7 @@ platforms :ruby do
   gem "sqlite3", "~> 1.3.3"
 
   group :db do
-    gem "pg", ">= 0.11.0"
+    gem "pg", ">= 0.11.0" unless ENV['TRAVIS'] # once pg is on travis this can be removed
     gem "mysql", ">= 2.8.1"
     gem "mysql2", ">= 0.3.6"
   end

ci/travis.rb

@@ -0,0 +1,142 @@
+#!/usr/bin/env ruby
+require 'fileutils'
+include FileUtils
+
+commands = [
+  'mysql -e "create database activerecord_unittest;"',
+  'mysql -e "create database activerecord_unittest2;"',
+  'psql  -c "create database activerecord_unittest;" -U postgres',
+  'psql  -c "create database activerecord_unittest2;" -U postgres'
+]
+
+commands.each do |command|
+  system("#{command} > /dev/null 2>&1")
+end
+
+class Build
+  MAP = {
+    'railties' => 'railties',
+    'ap'   => 'actionpack',
+    'am'   => 'actionmailer',
+    'amo'  => 'activemodel',
+    'ares' => 'activeresource',
+    'as'   => 'activesupport',
+    'ar'   => 'activerecord'
+  }
+
+  attr_reader :component, :options
+
+  def initialize(component, options = {})
+    @component = component
+    @options = options
+  end
+
+  def run!(options = {})
+    self.options.update(options)
+    Dir.chdir(dir) do
+      announce(heading)
+      ENV['IM'] = identity_map?.inspect
+      rake(*tasks)
+    end
+  end
+
+  def announce(heading)
+    puts "\n\e[1;33m[Travis CI] #{heading}\e[m\n"
+  end
+
+  def heading
+    heading = [gem]
+    heading << "with #{adapter} IM #{identity_map? ? 'enabled' : 'disabled'}" if activerecord?
+    heading << "in isolation" if isolated?
+    heading.join(' ')
+  end
+
+  def tasks
+    if activerecord?
+      ['mysql:rebuild_databases', "#{adapter}:#{'isolated_' if isolated?}test"]
+    else
+      ["test#{':isolated' if isolated?}"]
+    end
+  end
+
+  def key
+    key = [gem]
+    key << adapter if activerecord?
+    key << 'IM' if identity_map?
+    key << 'isolated' if isolated?
+    key.join(':')
+  end
+
+  def activerecord?
+    gem == 'activerecord'
+  end
+
+  def identity_map?
+    options[:identity_map]
+  end
+
+  def isolated?
+    options[:isolated]
+  end
+
+  def gem
+    MAP[component.split(':').first]
+  end
+  alias :dir :gem
+
+  def adapter
+    component.split(':').last
+  end
+
+  def rake(*tasks)
+    tasks.each do |task|
+      cmd = "bundle exec rake #{task}"
+      puts "Running command: #{cmd}"
+      return false unless system(cmd)
+    end
+    true
+  end
+end
+
+results = {}
+
+ENV['GEM'].split(',').each do |gem|
+  [false, true].each do |isolated|
+    next if gem == 'railties' && isolated
+
+    build = Build.new(gem, :isolated => isolated)
+    results[build.key] = build.run!
+
+    if build.activerecord?
+      build.options[:identity_map] = true
+      results[build.key] = build.run!
+    end
+  end
+end
+
+# puts
+# puts "Build environment:"
+# puts "  #{`cat /etc/issue`}"
+# puts "  #{`uname -a`}"
+# puts "  #{`ruby -v`}"
+# puts "  #{`mysql --version`}"
+# # puts "  #{`pg_config --version`}"
+# puts "  SQLite3: #{`sqlite3 -version`}"
+# `gem env`.each_line {|line| print "   #{line}"}
+# puts "   Bundled gems:"
+# `bundle show`.each_line {|line| print "     #{line}"}
+# puts "   Local gems:"
+# `gem list`.each_line {|line| print "     #{line}"}
+
+failures = results.select { |key, value| value == false }
+
+if failures.empty?
+  puts
+  puts "Rails build finished sucessfully"
+  exit(true)
+else
+  puts
+  puts "Rails build FAILED"
+  puts "Failed components: #{failures.map { |component| component.first }.join(', ')}"
+  exit(false)
+end