Inserting max_sliver_lifetime sitevar if max_ticket_lifetime do not exist,...

Inserting max_sliver_lifetime sitevar if max_ticket_lifetime do not exist, Otherwise just updating the existing record.

sql/updates/4/206

@@ -9,11 +9,21 @@ sub DoUpdate($$$)
     my ($dbhandle, $dbname, $version) = @_;
 
     # updating the sitevar name and description to make it
-    # more meaningful.
-    DBQueryFatal("update sitevariables set name = " .
-      "'protogeni/max_sliver_lifetime', description = " .
-      "'The maximum sliver lifetime. When set limits the lifetime of a " .
-      "sliver.' where name = 'protogeni/max_ticket_lifetime'");
+    # more meaningful if it exists.
+    # otherwise insert updated record.
+    if (TBSiteVarExists("protogeni/max_ticket_lifetime")) {
+        DBQueryFatal("update sitevariables set name = " .
+          "'protogeni/max_sliver_lifetime', description = " .
+          "'The maximum sliver lifetime. When set limits the lifetime " .
+          "of a sliver.' where name = 'protogeni/max_ticket_lifetime'");
+    }
+    else {
+        DBQueryFatal("INSERT INTO `sitevariables` VALUES " . 
+          "('protogeni/max_sliver_lifetime', '90', '90', " . 
+          "'The maximum sliver lifetime. When set limits the lifetime " . 
+          "of a sliver.',0)");
+
+    }
     return 0;
 }
 1;