Added 'updated' field to the images table, which is a timestamp

indicating when the image was last updated. This gets updated by
create_image .

The hope is that it will give us some idea of which revision of
our standard images custom images are based off of.

sql/database-create.sql

@@ -282,6 +282,7 @@ CREATE TABLE images (
   load_busy tinyint(4) NOT NULL default '0',
   ezid tinyint(4) NOT NULL default '0',
   shared tinyint(4) NOT NULL default '0',
+  updated datetime default NULL,
   PRIMARY KEY  (imagename,pid)
 ) TYPE=MyISAM;
 

utils/create_image.in

@@ -183,6 +183,13 @@ open(FILE, "> $filename") or
 close(FILE) or
     die("Could not truncate $filename: $!");
 
+#
+# Record when this image was updated, so that we can figure out which
+# revision of the testbed image it was based off.
+#
+DBQueryFatal("update images set updated=now() where ".
+		 "pid='$imagepid' and imagename='$imagename'");
+
 #
 # Okay, we want to build up a command line that will run the script on
 # on the client node. We use the imageid description to determine what