feature #2468: add rsync option to onehost sync

src/cli/one_helper/onehost_helper.rb

@@ -253,7 +253,14 @@ class OneHostHelper < OpenNebulaHelper::OneHelper
 
                     print_update_info(total-size, total, host['NAME'])
 
-                    sync_cmd = "scp -rp #{REMOTES_LOCATION}/. #{host['NAME']}:#{remote_dir} 2> /dev/null"
+                    if options[:rsync]
+                        sync_cmd = "rsync -Laz --delete #{REMOTES_LOCATION}" <<
+                            " #{host['NAME']}:#{remote_dir}"
+                    else
+                        sync_cmd = "scp -rp #{REMOTES_LOCATION}/. " <<
+                            "#{host['NAME']}:#{remote_dir} 2> /dev/null"
+                    end
+
                     `#{sync_cmd} 2>/dev/null`
 
                     if !$?.success?

src/cli/onehost

@@ -79,8 +79,16 @@ cmd=CommandParser::CmdParser.new(ARGV) do
         :description => "Force probe upgrade in onehost sync"
     }
 
+    RSYNC = {
+        :name   => "rsync",
+        :large  => "--rsync" ,
+        :description => "Use rsync to synchronize remotes. In case some " <<
+            "probes are no longer in the fronted are deleted in the hosts." <<
+            " rsync command must be installed in the frontend and nodes."
+    }
+
     CREAT_OPTIONS = [ IM, VMM, VNET, OneClusterHelper::CLUSTER ]
-    SYNC_OPTIONS  = [ OneClusterHelper::CLUSTER, FORCE ]
+    SYNC_OPTIONS  = [ OneClusterHelper::CLUSTER, FORCE, RSYNC ]
 
     ########################################################################
     # Formatters for arguments