rails-outdated.rb

#!/usr/bin/env ruby

def latest_maint_releases(vers)
  vers.inject([]) do |a, version|
    unless a.any? {|v| v[/\d+\.\d+/] == version[/\d+\.\d+/] && v > version  }
      a << version
    end
    a
  end
end

def point_rel(ver)
  ver[/\d+\.\d+/]
end

installed_releases = begin
  rails_info = `gem list rails`.grep(/^rails\s/)[0]
  rails_versions = rails_info.scan(/\d+\.\d+\.\d+/)
  latest_maint_releases(rails_versions)
end
installed_point_releases = installed_releases.collect {|v| point_rel(v) }.uniq

newest_maint_releases = begin
  rails_info = `gem list -ra rails`.grep(/^rails\s/)[0]
  rails_versions = rails_info.scan(/\d+\.\d+\.\d+/)
  latest_maint_releases(rails_versions)
end

needed_versions = newest_maint_releases - installed_releases
needed_versions.reject! {|v| !installed_point_releases.include?(point_rel(v)) }
if !needed_versions.empty?
  puts "There are newer maintenance releases for the rails versions installed: #{needed_versions.join(", ")}"
end

apps = `grep "RAILS_GEM_VERSION" */current/config/environment.rb`
outdated_apps = apps.reject {|a| newest_maint_releases.any? {|v| a.include?(v) } }
for app in outdated_apps
  app_dir = app[/^(.+?)\/current\/config\/environment\.rb/, 1]
  if app =~ /['"]([~><=]*)(\d+(\.\d+){1,})['"]/
    unless $1.include?(">") # app is automatically using newer installed versions
      app_version = $2
      new_version = newest_maint_releases.detect {|nmr| point_rel(app_version) == point_rel(nmr) }
      puts "#{app_dir} (#{app_version} < #{new_version})"
    end
  else
    puts "Could not parse RAILS_GEM_VERSION for #{app_dir}"
  end
end