Method: Chef::Resource.use

Defined in:
lib/chef/resource.rb

.use(partial) ⇒ Object

Use a partial code fragment. This can be used for code sharing between multiple resources.

Do not wrap the code fragment in a class or module. It also does not support the use of super to subclass any methods defined in the fragment, the methods will just be overwritten.

Parameters:

  • partial (String) —

    the code fragment to eval against the class



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# File 'lib/chef/resource.rb', line 1509

def self.use(partial)
  if partial =~ /^core::(.*)/
    partial = $1
    dirname = ::File.dirname(partial)
    basename = ::File.basename(partial, ".rb")
    basename = basename[1..] if basename.start_with?("_")
    class_eval IO.read(::File.expand_path("resource/#{dirname}/_#{basename}.rb", __dir__))
  else
    dirname = ::File.dirname(partial)
    basename = ::File.basename(partial, ".rb")
    basename = basename[1..] if basename.start_with?("_")

    # Support recursive `use`
    callers = caller_locations
    used_from = if callers.first.label == "use"
                  callers.detect { |caller| caller.label == "class_from_file" }.path
                else
                  callers.first.path
                end

    fullpath = ::File.expand_path("#{dirname}/_#{basename}.rb", ::File.dirname(used_from))
    class_eval IO.read(fullpath)
  end
end