Add global attribute on rvm_gem which installs gem in global gemsets.

attributes/default.rb

@@ -29,12 +29,10 @@
 # list of rubies that will be installed
 default[:rvm][:rubies] = [ select_ruby(rvm[:default_ruby]) ]
 
-# hash of gemsets and their list of gems to be installed. If default_ruby
-# contains a gemset like ree-1.8.7@awesome then strip the gemset to get at the
-# global gemset for that ruby.
-default[:rvm][:gems] = {
-  "#{select_ruby(rvm[:default_ruby])}@global" => [
-    { :name => "bundler" }
-  ]
-}
+# list of gems to be installed in global gemset of all rubies
+default[:rvm][:global_gems] = [
+  { :name => "bundler" }
+]
 
+# hash of gemsets and their list of gems to be installed.
+default[:rvm][:gems] = Hash.new

libraries/helpers.rb

@@ -35,6 +35,14 @@ def ruby_string_sane?(rubie)
   return true if rubie =~ /^[^-]+-[^-]+/  # must be xxx-vvv at least
 end
 
+##
+# Returns a list of installed rvm rubies on the system
+#
+# @return [Array] the list of currently installed rvm rubies
+def installed_rubies
+  RVM.list_strings
+end
+
 ##
 # Determines whether or not the given ruby is already installed
 #
@@ -43,8 +51,7 @@ def ruby_string_sane?(rubie)
 def ruby_installed?(rubie)
   return false unless ruby_string_sane?(rubie)
 
-  installed = RVM.list_strings
-  ! installed.select { |r| r.start_with?(rubie) }.empty?
+  ! installed_rubies.select { |r| r.start_with?(rubie) }.empty?
 end
 
 ##

providers/gem.rb

@@ -27,18 +27,57 @@
     ruby_string.sub!(/default/, current_ruby_default)
   end
 
-  # ensure ruby is installed and gemset exists
-  e = rvm_environment ruby_string do
-    action :nothing
+  if new_resource.global
+    # add gem entry into global.gems
+    update_global_gems_file :create
+
+    # install gem in all rubies in global gemset
+    installed_rubies.each do |rubie|
+      gem_package_wrapper :install, "#{rubie}@global"
+    end
+  else
+    # ensure ruby is installed and gemset exists
+    e = rvm_environment ruby_string do
+      action :nothing
+    end
+    e.run_action(:create)
+
+    gem_package_wrapper :install
   end
-  e.run_action(:create)
+end
 
+##
+# Wraps the gem_package provider for rubygems
+#
+# @param [Symbol] action to be performed with gem_package provider
+# @param [optional, String, #to_s] the fully qualifed rvm string
+def gem_package_wrapper(exec_action, ruby_string=new_resource.ruby_string)
   g = gem_package new_resource.gem do
     gem_binary  "rvm #{ruby_string} gem"
     source      new_resource.source if new_resource.source
     options     new_resource.options if new_resource.options
     version     new_resource.version if new_resource.version
     action      :nothing
   end
-  g.run_action(:install)
+  g.run_action(exec_action)
+end
+
+##
+# Updates global.gems file to create or remove a gem entry
+#
+# @oaram [Symbol] action to :create or :remove the gem from the file
+def update_global_gems_file(exec_action)
+  global_gems_file = "#{node[:rvm][:root_path]}/gemsets/global.gems"
+  gem = new_resource.gem
+
+  if exec_action == :create
+    e = execute "Add #{gem} to #{global_gems_file}" do
+      user      "root"
+      group     "rvm"
+      command   %{echo "#{gem}" >> "#{global_gems_file}"}
+      not_if    %{grep -q "^#{gem}" "#{global_gems_file}"}
+      action    :nothing
+    end
+    e.run_action(:run)
+  end
 end

recipes/default.rb

@@ -46,6 +46,17 @@
   rvm_default_ruby node[:rvm][:default_ruby]
 end
 
+# installs global gems
+node[:rvm][:global_gems].each do |gem|
+  rvm_gem gem[:name] do
+    global    true
+    version   gem[:version] if gem[:version]
+    action    gem[:action]  if gem[:action]
+    options   gem[:options] if gem[:options]
+    source    gem[:source]  if gem[:source]
+  end
+end
+
 # installs gems
 node[:rvm][:gems].each_pair do |rstring, gems|
   rvm_environment rstring
@@ -54,9 +65,9 @@
     rvm_gem gem[:name] do
       ruby_string   rstring
       version       gem[:version] if gem[:version]
-      action        gem[:action] if gem[:action]
+      action        gem[:action]  if gem[:action]
       options       gem[:options] if gem[:options]
-      source        gem[:source] if gem[:source]
+      source        gem[:source]  if gem[:source]
     end
   end
 end

resources/gem.rb

@@ -23,6 +23,7 @@
 
 attribute :gem, :kind_of => String, :name_attribute => true
 attribute :ruby_string, :kind_of => String, :default => "default"
+attribute :global, :default => false
 attribute :source, :kind_of => String
 attribute :options, :kind_of => Hash
 attribute :version, :kind_of => String