Originally Posted by sulu

Basically yes, although my version is even simpler (and therefore probably less elegant):

Code:

pp900-a:/sbin# diff closechroot closechroot.old
--- closechroot
+++ closechroot.old
@@ -29,7 +29,7 @@
 fi
 
 #Abort if chroot not mounted.
-if [ "$IMGFILE" != "none" ] && [ ! -f "$CHROOT/var/lock/qmount-complete" ] ; then
+if [ ! -f "$CHROOT/var/lock/qmount-complete" ] ; then
   echo "Nothing to do; chroot not mounted!"
-   exit 1
+   #exit 1
 fi

I don't remember the details but when I had some problems with lingering mounts I decided to use steamroller tactics.
All you have to do is make sure everything that was mounted gets unmounted afterwards.