guests/ubuntu: Change host name in one command

This also removes the dependency on the debian hostname setting.

plugins/guests/ubuntu/cap/change_host_name.rb

@@ -1,50 +1,51 @@
 module VagrantPlugins
   module GuestUbuntu
     module Cap
-      class ChangeHostName < VagrantPlugins::GuestDebian::Cap::ChangeHostName
+      class ChangeHostName
         def self.change_host_name(machine, name)
-          super
-        end
+          comm = machine.communicate
 
-        def update_etc_hostname
-          return super unless systemd?
-          sudo("hostnamectl set-hostname '#{short_hostname}'")
-        end
+          if !comm.test("hostname -f | grep -w '#{name}'")
+            basename = name.split(".", 2)[0]
+            comm.sudo <<-EOH.gsub(/^ {14}/, '')
+              # Set the hostname
+              echo '#{name}' > /etc/hostname
+              hostname -F /etc/hostname
 
-        def refresh_hostname_service
-          if hardy?
-            # hostname.sh returns 1, so use `true` to get a 0 exitcode
-            sudo("/etc/init.d/hostname.sh start; true")
-          elsif systemd?
-            # Service runs via hostnamectl
-          else
-            sudo("service hostname start")
+              if command -v hostnamectl; then
+                hostnamectl set-hostname '#{name}'
+              fi
+
+              # Remove comments and blank lines from /etc/hosts
+              sed -i'' -e 's/#.*$//' -e '/^$/d' /etc/hosts
+
+              # Prepend ourselves to /etc/hosts
+              grep -w '#{name}' /etc/hosts || {
+                sed -i'' '1i 127.0.0.1\\t#{name}\\t#{basename}' /etc/hosts
+              }
+
+              # Update mailname
+              echo '#{name}' > /etc/mailname
+
+              # Restart networking and force new DHCP
+              if [ test -f /etc/init.d/hostname ]; then
+                /etc/init.d/hostname start || true
+              fi
+
+              if [ test -f /etc/init.d/hostname.sh ]; then
+                /etc/init.d/hostname.sh start || true
+              fi
+
+              if [ test -f /etc/init.d/networking ]; then
+                /etc/init.d/networking force-reload
+              fi
+
+              if [ test -f /etc/init.d/network-manager ]; then
+                /etc/init.d/network-manager force-reload
+              fi
+            EOH
           end
         end
-
-        def hardy?
-          os_version("hardy")
-        end
-
-        def renew_dhcp
-          sudo("ifdown -a; ifup -a; ifup -a --allow=hotplug")
-        end
-
-      private
-
-        def init_package
-          machine.communicate.execute('cat /proc/1/comm') do |type, data|
-            return data.chomp if type == :stdout
-          end
-        end
-
-        def os_version(name)
-          machine.communicate.test("[ `lsb_release -c -s` = #{name} ]")
-        end
-
-        def systemd?
-          init_package == 'systemd'
-        end
       end
     end
   end