initial stab at it

Rakefile

@@ -0,0 +1,33 @@
+task :submodule do
+  git "submodule update --init"
+end
+
+require 'rake/clean'
+CLEAN.include('tmp/*')
+
+def git(command)
+  system %{git #{command}}
+end
+
+cookbook_list = FileList['cookbooks/*'].map do |cookbook_path|
+
+  if File.directory?(cookbook_path)
+    cookbook = cookbook_path.split("/").last
+    desc "cook #{cookbook}"
+    file "tmp/#{cookbook}" do
+      git "clone --no-hardlinks cookbooks tmp/#{cookbook}"
+      Dir.chdir("#{Rake.original_dir}/tmp/#{cookbook}")
+      git "filter-branch --subdirectory-filter #{cookbook} HEAD"
+      git "reset --hard"
+      git "gc --aggressive"
+      git "prune"
+      Dir.chdir(Rake.original_dir)
+    end
+
+    cookbook
+  end
+end.reject { |c| c.nil? }
+
+task :default do
+  cookbook_list.each { |cookbook| Rake::Task["tmp/#{cookbook}"].invoke }
+end

tmp/.gitignore

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+*
+!.gitignore