[#4594] Revert "fixes #2573, #2085, #1291..."

This is a revert of ticket #2573, which introduces a reverse DNS lookup
to the resolution of fqdn. As per #3898, this does not corrently return
the fqdn on all systems.

This reverts commit dca615c98b864d75e2ac5899d98d04a2bd979eba.

3 files changed, 7 insertions, 12 deletions

diff --git a/lib/facter/domain.rb b/lib/facter/domain.rb
index 5dfead0..b1bba4d 100644
--- a/lib/facter/domain.rb
+++ b/lib/facter/domain.rb
@@ -4,14 +4,14 @@ Facter.add(:domain) do
         # steps is important
 
         Facter.value(:hostname)
-        # try to fetch the domain from hostname if long hostname is used.
-        if defined? $fqdn and $fqdn =~ /^([\w-]+)\.(.+)$/
-          next $2
-        end
+        next $domain if defined? $domain and ! $domain.nil?
 
         domain = Facter::Util::Resolution.exec('dnsdomainname')
         next domain if domain =~ /.+\..+/
 
+        domain = Facter::Util::Resolution.exec('domainname')
+        next domain if domain =~ /.+\..+/
+
         if FileTest.exists?("/etc/resolv.conf")
             domain = nil
             search = nil
diff --git a/lib/facter/fqdn.rb b/lib/facter/fqdn.rb
index 6271995..5ebc5f5 100644
--- a/lib/facter/fqdn.rb
+++ b/lib/facter/fqdn.rb
@@ -1,9 +1,5 @@
 Facter.add(:fqdn) do
     setcode do
-        # try to fetch the fqdn from hostname if long hostname is used.
-        Facter.value(:hostname)
-        next $fqdn if defined? $fqdn and ! $fqdn.nil?
-
         host = Facter.value(:hostname)
         domain = Facter.value(:domain)
         if host and domain
diff --git a/lib/facter/hostname.rb b/lib/facter/hostname.rb
index c3ca968..188efa4 100644
--- a/lib/facter/hostname.rb
+++ b/lib/facter/hostname.rb
@@ -1,13 +1,12 @@
 Facter.add(:hostname, :ldapname => "cn") do
     setcode do
-        require 'socket'
         hostname = nil
-        name = Socket.gethostbyname(Socket.gethostname).first
+        name = Facter::Util::Resolution.exec('hostname') or nil
         if name
             if name =~ /^([\w-]+)\.(.+)$/
                 hostname = $1
-                # the FQDN/Domain facts use this
-                $fqdn = name
+                # the Domain class uses this
+                $domain = $2
             else
                 hostname = name
             end