From 06322ffb233dc608cc14b8b50e45a13cbddee17b Mon Sep 17 00:00:00 2001
From: danielsdeleo <dan@opscode.com>
Date: Sun, 24 Feb 2013 12:16:55 -0800
Subject: [CHEF-3933] use rubygems 2.0 files/classes/methods

* rubygems/format file removed
* Gem::Package replaces functionality in Gem::Format
* Gem.sources returns a SourceList which must be coerced to array
---
 lib/chef/provider/package/rubygems.rb | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/lib/chef/provider/package/rubygems.rb b/lib/chef/provider/package/rubygems.rb
index e60d73ab62..2a778fdb14 100644
--- a/lib/chef/provider/package/rubygems.rb
+++ b/lib/chef/provider/package/rubygems.rb
@@ -31,7 +31,14 @@ require 'rubygems/version'
 require 'rubygems/dependency'
 require 'rubygems/spec_fetcher'
 require 'rubygems/platform'
-require 'rubygems/format'
+
+# Compatibility note: Rubygems 2.0 removes rubygems/format in favor of
+# rubygems/package.
+begin
+  require 'rubygems/format'
+rescue LoadError
+  require 'rubygems/package'
+end
 require 'rubygems/dependency_installer'
 require 'rubygems/uninstaller'
 require 'rubygems/specification'
@@ -105,6 +112,22 @@ class Chef
             Gem.sources = original_sources
           end
 
+          ##
+          # Extracts the gemspec from a (on-disk) gem package.
+          # === Returns
+          # Gem::Specification
+          #
+          #--
+          # Compatibility note: Rubygems 1.x uses Gem::Format, 2.0 moved this
+          # code into Gem::Package.
+          def spec_from_file(file)
+            if defined?(Gem::Format)
+              Gem::Format.from_file_by_path(source).spec
+            else
+              Gem::Package.new(file).spec
+            end
+          end
+
           ##
           # Determines the candidate version for a gem from a .gem file on disk
           # and checks if it matches the version contraints in +gem_dependency+
@@ -114,7 +137,7 @@ class Chef
           # nil           returns nil if the gem on disk doesn't match the
           #               version constraints for +gem_dependency+
           def candidate_version_from_file(gem_dependency, source)
-            spec = Gem::Format.from_file_by_path(source).spec
+            spec = spec_from_file(source)
             if spec.satisfies_requirement?(gem_dependency)
               logger.debug {"#{@new_resource} found candidate gem version #{spec.version} from local gem package #{source}"}
               spec.version
@@ -152,7 +175,7 @@ class Chef
               logger.debug { "#{@new_resource} found gem #{spec.name} version #{version} for platform #{spec.platform} from #{spec_with_source[1]}" }
               version
             else
-              source_list = sources.compact.empty? ? "[#{Gem.sources.join(', ')}]" : "[#{sources.join(', ')}]"
+              source_list = sources.compact.empty? ? "[#{Gem.sources.to_a.join(', ')}]" : "[#{sources.join(', ')}]"
               logger.warn { "#{@new_resource} failed to find gem #{gem_dependency} from #{source_list}" }
               nil
             end
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