Stunnel upgrade causes portupgrade to stall

I usually run 'portupgrade -arR' once a week and leave it to itself to get on with it. Unfortunately sometimes I come back and find only a couple of ports have been upgraded and portupgrade has stalled waiting for me to enter some input about something or other. The usual suspect is the upgrade of stunnel - stunnel asks you at the deinstallation stage whether it should remove the 'stunnel' user and group and the portupgrade won't proceed until you've answered yes or no.

This is all well and good if you're permanantly deleting the port, you don't really want unnecessary users and groups left on your system. However in the case of portupgrade, the user/group will be used again so asking if you want to remove the user/group doesn't really need an answer - just leave the user/group alone and get on with it already!

I had a quick google for 'stunnel portupgrade user groups' and found someone who'd had the same problem. The solution the guy mentioned is to set the option PACKAGE_BUILDING for the stunnel port in the portupgrade config file - /usr/local/etc/pkgtools.conf:



Unfortunately as yet this doesn't seem to work - neither does setting 'BATCH' which usually does the trick anyway (the guy complaining about hte issue noted that BATCH didn't work for him, whist PACKAGE_BUILDING did. Neither works for me :(). Anyway I'll probably spend a few minutes looking into it and see if I can sort it... in the mean time if anyone has any ideas let me know in the comments :)

UPDATE:
Mmm ok, had a quick look into the problem and it looks like portupgrade isn't taking any of the flags set in pkgtools.conf - at the start of the upgrade it says 'BATCH=1' is set, but when the deinstall script runs the value of BATCH is reset to empty for some reason.

UPDATE2: I think the problem is because whilst portupgrade honours the env variables set in pkgtools.conf, the pkg-deinstall script for stunnel doesn't inherit any env variables because it's invoked from pkg_delete. The only solution I can think of off top of head is to export the BATCH variable on the commandline along the lines of:

setenv BATCH 1

just before running portupgrade. PITA (works though, just tested it:).