lib/Tools/version

--- a/lib/Tools/version	Thu Mar 15 22:17:56 2018 +0100
+++ b/lib/Tools/version	Thu Mar 15 22:28:20 2018 +0100
@@ -60,7 +60,7 @@
   if [ -n "$ISABELLE_ID" ]; then
     echo "$ISABELLE_ID"
   else
-    "${HG:-hg}" -R "$ISABELLE_HOME" id -i -r tip 2>/dev/null || echo undefined
+    "${HG:-hg}" -R "$ISABELLE_HOME" log -r "p1()" --template="{node|short}\n" 2>/dev/null || echo undefined
   fi
 else
   echo 'repository version'    # filled in automatically!