Allow no default RVM ruby (i.e. use system ruby). Closes #14

README.md

@@ -26,7 +26,7 @@ built as a pre-requisite. The value can also contain a gemset in the form of
 found when running `rvm list known`.
 
 The default is `ruby-1.9.2-p180`. To disable a default ruby from being
-installed, see the `install_rubies` attribute.
+set, use an empty string (`""`) or a value of `"system"`.
 
 ## `rubies`
 

libraries/helpers.rb

@@ -138,19 +138,41 @@ def current_ruby_default
 # @param [String, #to_s] the fully qualified RVM ruby string
 # @return [Boolean] is this ruby the default one?
 def ruby_default?(rubie)
-  return false unless ruby_string_sane?(rubie)
-
   current_default = current_ruby_default
-  return false if current_default.nil?
+
+  if current_default.nil?
+    if rubie == "system"
+      return true
+    else
+      return false
+    end
+  end
+
+  return false unless ruby_string_sane?(rubie)
   current_default.start_with?(rubie)
 end
 
+##
+# Determines whether or not the given ruby could be considered the system
+# ruby.
+#
+# @param [String, #to_s] an RVM ruby string
+# @return [Boolean] is this ruby string the a system ruby?
+def system_ruby?(rubie)
+  return true if rubie.nil?         # nil should be system
+  return true if rubie.empty?       # an empty string should be system
+  return true if rubie == "system"  # keyword system should be system
+  return false                      # anything else does not represent system
+end
+
 ##
 # Determines whether or not and ruby/gemset environment exists
 #
 # @param [String, #to_s] the fully qualified RVM ruby string
 # @return [Boolean] does this environment exist?
 def env_exists?(ruby_string)
+  return true if system_ruby?(ruby_string)
+
   rubie   = select_ruby(ruby_string)
   gemset  = select_gemset(ruby_string)
 

providers/default_ruby.rb

@@ -21,10 +21,11 @@
 
 action :create do
   ruby_string = new_resource.ruby_string
+  ruby_string = "system" if system_ruby?(ruby_string)
   rubie   = select_ruby(ruby_string)
   gemset  = select_gemset(ruby_string)
 
-  if ruby_unknown?(rubie)
+  if rubie != "system" && ruby_unknown?(rubie)
     Chef::Log.warn("rvm_default_ruby[#{rubie}] is either not fully " +
       "qualified or not known . Use `rvm list known` to get a full list.")
   elsif ruby_default?(ruby_string)

recipes/default.rb

@@ -36,38 +36,38 @@
 
 include_recipe "rvm::system"
 
-if node[:rvm][:install_rubies] == "enable"
+unless node[:rvm][:install_rubies] == "disable"
   # set a default ruby
   rvm_default_ruby node[:rvm][:default_ruby]
 
   # install additional rubies
   node[:rvm][:rubies].each do |rubie|
     rvm_ruby rubie
   end
-end
 
-# install 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]
+  # install 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
-end
 
-# install additional gems
-node[:rvm][:gems].each_pair do |rstring, gems|
-  rvm_environment rstring
+  # install additional gems
+  node[:rvm][:gems].each_pair do |rstring, gems|
+    rvm_environment rstring
 
-  gems.each do |gem|
-    rvm_gem gem[:name] do
-      ruby_string   rstring
-      version       gem[:version] if gem[:version]
-      action        gem[:action]  if gem[:action]
-      options       gem[:options] if gem[:options]
-      source        gem[:source]  if gem[:source]
+    gems.each do |gem|
+      rvm_gem gem[:name] do
+        ruby_string   rstring
+        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
   end
 end