```ruby
#
# Author:: Daniel DeLeo (<dan@opscode.com>)
# Author:: Seth Falcon (<seth@opscode.com>)
# Author:: Chris Walters (<cw@opscode.com>)
# Copyright:: Copyright (c) 2010-2011 Opscode, 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 'open3'

module Chef
  module Expander

    VERSION = "0.10.5"

    def self.version
      @rev ||= begin
        rev = Open3.popen3("git rev-parse HEAD") {|stdin, stdout, stderr| stdout.read }.strip
        rev.empty? ? nil : " (#{rev})"
      end
      "#{VERSION}#@rev"
    end

  end
end
```

Allow for git to be uninstalled.
user
```ruby
#
# Author:: Daniel DeLeo (<dan@opscode.com>)
# Author:: Seth Falcon (<seth@opscode.com>)
# Author:: Chris Walters (<cw@opscode.com>)
# Copyright:: Copyright (c) 2010-2011 Opscode, 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 'open3'

module Chef
  module Expander

    VERSION = "0.10.5"

    def self.version
      @rev ||= begin
        begin
          rev = Open3.popen3("git rev-parse HEAD") {|stdin, stdout, stderr| stdout.read }.strip
        rescue Errno::ENOENT
          rev = ""
        end
        rev.empty? ? nil : " (#{rev})"
      end
      "#{VERSION}#@rev"
    end

  end
end
```
assistant