Initial Chef repository

cookbooks/homebrew/libraries/homebrew_mixin.rb

@@ -0,0 +1,66 @@
+#
+# Author:: Joshua Timberman (<jtimberman@opscode.com>)
+# Author:: Graeme Mathieson (<mathie@woss.name>)
+# Cookbook Name:: homebrew
+# Libraries:: homebrew_mixin
+#
+# Copyright 2011-2013, Opscode, Inc.
+#
+# 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.
+#
+# Include the mixin from Chef 12 if its defined, when we get to the
+# #homebrew_owner method below...
+class Chef12HomebrewUser
+  include Chef::Mixin::HomebrewUser if defined?(Chef::Mixin::HomebrewUser)
+end
+
+module Homebrew
+  # Homebrew
+  module Mixin
+    def homebrew_owner
+      if defined?(Chef::Mixin::HomebrewUser)
+        begin
+          @homebrew_owner ||= Chef12HomebrewUser.new.find_homebrew_uid
+        rescue Chef::Exceptions::CannotDetermineHomebrewOwner
+          @homebrew_owner ||= calculate_owner
+        end
+      else
+        @homebrew_owner ||= calculate_owner
+      end
+    end
+
+    private
+
+    def calculate_owner
+      owner = homebrew_owner_attr || sudo_user || current_user
+      if owner == 'root'
+        fail Chef::Exceptions::User,
+             "Homebrew owner is 'root' which is not supported. " +
+             "To set an explicit owner, please set node['homebrew']['owner']."
+      end
+      owner
+    end
+
+    def homebrew_owner_attr
+      node['homebrew']['owner']
+    end
+
+    def sudo_user
+      ENV['SUDO_USER']
+    end
+
+    def current_user
+      ENV['USER']
+    end
+  end
+end