Allow ruby_build to install new upgrades automatically

Addresses #138

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Allow ruby-build to recognize when it needs to be upgraded.
+- Allow ruby-build to reinstall Ruby if the version changes.
+
 ## 2.3.15 - *2023-05-15*
 
 ## 2.3.14 - *2023-04-17*

resources/definition.rb

@@ -87,7 +87,10 @@
     environment env
     user new_resource.user
     group new_resource.group
-    not_if { ::File.exist?("#{installation_path}/bin") }
+    not_if do
+      ::Dir.exist?("#{installation_path}/bin") &&
+        new_resource.definition == `#{installation_path}/bin/ruby -e 'print RUBY_VERSION'`
+    end
     live_stream true
     action :run
   end

resources/install.rb

@@ -33,6 +33,9 @@
   execute 'Install ruby-build' do
     cwd src_path
     command %(sh ./install.sh)
-    not_if { ::File.exist?('/usr/local/bin/ruby-build') }
+    not_if do
+      ::File.exist?('/usr/local/bin/ruby-build') &&
+        `#{src_path}/bin/ruby-build --version` == `/usr/local/bin/ruby-build --version`
+    end
   end
 end