- Emerge Cookbook, making unmasking packages easier.

    - See README for specifics.

Signed-off-by: Scott M. Likens <slikens@engineyard.com>

cookbooks/emerge/README.rdoc

@@ -0,0 +1,22 @@
+= DESCRIPTION:
+
+Emerge Cookbook.  
+
+This cookbook holds 2 definitions, one called enable_package and one called update_file.  Between these two definitions it enables you to 'unmask' a package in Chef and then install an 'masked' version of said package.
+
+= USAGE:
+
+For example if you want to install Libxml 2.7.6 on the AppCloud you would use the following as a recipe.
+
+enable_package "dev-libs/libxml2" do
+  version "2.7.6"
+end
+
+package "dev-libs/libxml2" do
+  version "2.7.6"
+  action :install
+end
+
+= LEGEND:
+
+Gentoo uses the names 'mask' and 'unmask' terminology between stable and unstable.  Typically this is done in /etc/make.conf with ACCEPT_KEYWORDS declaration for '~amd64 and ~x86".  However it can also be added to /etc/portage/package.keywords/local to 'unmask' packages individually.

cookbooks/emerge/definitions/enable_package.rb

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+define :enable_package, :version => nil do
+  name = params[:name]
+  version = params[:version]
+  full_name = name << ("-#{version}" if version)
+
+  update_file "local portage package.keywords" do
+    path "/etc/portage/package.keywords/local"
+    body "=#{full_name}"
+    not_if "grep '=#{full_name}' /etc/portage/package.keywords/local"
+  end
+end

cookbooks/emerge/definitions/update_file.rb

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+define :update_file, :action => :append do
+  require 'tempfile'
+
+  filepath = params[:path] || params[:name]
+
+  file params[:name] do
+    backup params[:backup] if params[:backup]
+    group params[:group] if params[:group]
+    mode params[:mode] if params[:mode]
+    owner params[:owner] if params[:owner]
+    path filepath
+  end
+
+  case params[:action].to_sym
+  when :append, :rewrite
+
+    mode = params[:action].to_sym == :append ? 'a' : 'w'
+
+    ruby_block "#{params[:action]}-to-#{filepath}" do
+      block do
+        File.open(filepath, mode) do |f|
+          f.puts params[:body]
+        end
+      end
+    end
+
+  when :truncate
+
+    execute "truncate-#{filepath}" do
+      command "> #{filepath}"
+    end
+
+  end
+end