chef

https://github.com/opscode/chef

Ruby

A systems integration framework, built to bring the benefits of configuration management to your entire infrastructure.

Chef::DSL::RegistryHelper#registry_key_exists?

the registry instance is cheap to build and throwing it away ensures we
don't carry any state (e.g. magic 32-bit/64-bit settings) between calls

Source | Google | Stack overflow

Edit

git clone [email protected]:opscode/chef.git
cd chef
open lib/chef/dsl/registry_helper.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-Chef--DSL--RegistryHelper-registry_key_exists--for-pr

# Commit to git
git add lib/chef/dsl/registry_helper.rbgit commit -m "better docs for Chef::DSL::RegistryHelper#registry_key_exists?"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-Chef--DSL--RegistryHelper-registry_key_exists--for-pr
hub pull-request

# Celebrate!