/usr/lib/ruby/vendor_ruby/ohai/plugins/windows/hostname.rb is in ohai 6.14.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Author:: James Gartrell (<jgartrel@gmail.com>)
# Copyright:: Copyright (c) 2009 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 'ruby-wmi'
require 'socket'
host = WMI::Win32_ComputerSystem.find(:first)
hostname "#{host.Name}"
info = Socket.gethostbyname(Socket.gethostname)
if info.first =~ /.+?\.(.*)/
fqdn info.first
else
#host is not in dns. optionally use:
#C:\WINDOWS\system32\drivers\etc\hosts
fqdn Socket.gethostbyaddr(info.last).first
end
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