RFC-060 gem metadata MVP

3 files changed, 84 insertions, 1 deletions

diff --git a/lib/chef/cookbook/cookbook_collection.rb b/lib/chef/cookbook/cookbook_collection.rb
index 81e7bb92b4..7e633da03d 100644
--- a/lib/chef/cookbook/cookbook_collection.rb
+++ b/lib/chef/cookbook/cookbook_collection.rb
@@ -18,6 +18,7 @@
 #
 
 require "chef/mash"
+require "chef/cookbook/gem_installer"
 
 class Chef
   # == Chef::CookbookCollection
@@ -54,5 +55,9 @@ class Chef
         cookbook_version.metadata.validate_ohai_version!
       end
     end
+
+    def install_gems
+      Cookbook::GemInstaller.new(self).install
+    end
   end
 end
diff --git a/lib/chef/cookbook/gem_installer.rb b/lib/chef/cookbook/gem_installer.rb
new file mode 100644
index 0000000000..b6f1859725
--- /dev/null
+++ b/lib/chef/cookbook/gem_installer.rb
@@ -0,0 +1,60 @@
+#--
+# Author:: Christopher Walters (<cw@opscode.com>)
+# Author:: Tim Hinderliter (<tim@opscode.com>)
+# Copyright:: Copyright (c) 2010-2015 Chef Software, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'tmpdir'
+require 'bundler/inline'
+
+class Chef
+  class Cookbook
+    class GemInstaller
+      attr_accessor :cookbook_collection
+
+      def initialize(cookbook_collection)
+        @cookbook_collection = cookbook_collection
+      end
+
+      def install
+        cookbook_gems = []
+
+        cookbook_collection.each do |cookbook_name, cookbook_version|
+          cookbook_gems += cookbook_version.metadata.gems
+        end
+
+        return if cookbook_gems.empty?
+
+        gemfile(true) do
+          source 'https://rubygems.org'
+          cookbook_gems.each do |args|
+            gem *args
+          end
+        end
+      end
+
+      class ChefBundlerUI < Bundler::UI::Silent
+        def confirm(msg, newline = nil)
+          Chef::Log.warn("CONFIRM: #{msg}")
+        end
+
+        def error(msg, newline = nil)
+          Chef::Log.warn("ERROR: #{msg}")
+        end
+      end
+    end
+  end
+end
diff --git a/lib/chef/cookbook/metadata.rb b/lib/chef/cookbook/metadata.rb
index 7cc4be9f89..1771a92f9e 100644
--- a/lib/chef/cookbook/metadata.rb
+++ b/lib/chef/cookbook/metadata.rb
@@ -58,12 +58,14 @@ class Chef
       PRIVACY                = "privacy".freeze
       CHEF_VERSIONS          = "chef_versions".freeze
       OHAI_VERSIONS          = "ohai_versions".freeze
+      GEMS                   = "gems".freeze
 
       COMPARISON_FIELDS = [ :name, :description, :long_description, :maintainer,
                             :maintainer_email, :license, :platforms, :dependencies,
                             :recommendations, :suggestions, :conflicting, :providing,
                             :replacing, :attributes, :groupings, :recipes, :version,
-                            :source_url, :issues_url, :privacy, :chef_versions, :ohai_versions ]
+                            :source_url, :issues_url, :privacy, :chef_versions, :ohai_versions,
+                            :gems ]
 
       VERSION_CONSTRAINTS = { :depends      => DEPENDENCIES,
                               :recommends   => RECOMMENDATIONS,
@@ -93,6 +95,8 @@ class Chef
       attr_reader :chef_versions
       # @return [Array<Gem::Dependency>] Array of supported Ohai versions
       attr_reader :ohai_versions
+      # @return [Array<Array>] Array of gems to install with *args as an Array
+      attr_reader :gems
 
       # Builds a new Chef::Cookbook::Metadata object.
       #
@@ -130,6 +134,7 @@ class Chef
         @privacy = false
         @chef_versions = []
         @ohai_versions = []
+        @gems = []
 
         @errors = []
       end
@@ -420,6 +425,17 @@ class Chef
         @ohai_versions
       end
 
+      # Metadata DSL to set a gem to install from the cookbook metadata.  May be declared
+      # multiple times.  All the gems from all the cookbooks are combined into one Gemfile
+      # and depsolved together.  Uses Bundler's DSL for its implementation.
+      #
+      # @param args [Array<String>] Gem name and options to pass to Bundler's DSL
+      # @return [Array<Array>] Array of gem statements as args
+      def gem(*args)
+        @gems << args unless args.empty?
+        @gems
+      end
+
       # Adds a description for a recipe.
       #
       # === Parameters
@@ -573,6 +589,7 @@ class Chef
           PRIVACY                => self.privacy,
           CHEF_VERSIONS          => gem_requirements_to_array(*self.chef_versions),
           OHAI_VERSIONS          => gem_requirements_to_array(*self.ohai_versions),
+          GEMS                   => self.gems,
         }
       end
 
@@ -609,6 +626,7 @@ class Chef
         @privacy                      = o[PRIVACY] if o.has_key?(PRIVACY)
         @chef_versions                = gem_requirements_from_array("chef", o[CHEF_VERSIONS]) if o.has_key?(CHEF_VERSIONS)
         @ohai_versions                = gem_requirements_from_array("ohai", o[OHAI_VERSIONS]) if o.has_key?(OHAI_VERSIONS)
+        @gems                         = o[GEMS] if o.has_key?(GEMS)
         self
       end