problems with portupgrade under non-root user

I want to set up a FreeBSD system so that all portupgrades are done by a "portbld" user, which has restricted 'sudo' rights to execute only portupgrade-related commands. To that end, I did the following:

$ sudo chown -R portbld:portbld /usr/ports
$ sudo chown -R portbld:portbld /var/db/sup/ports-all
$ cd /usr/ports && sudo -u portbld make update
(cvsup runs)
(add 'portbld' to sudoers with NOPASSWD: ALL for now)
$ sudo -u portbld portupgrade -s dovecot

Unfortunately this last step doesn't work: ruby dumps core:

Making all in doc
cat dovecot-config.in|sed "s|moduledir=|moduledir=/usr/local/lib/dovecot|"
dovecot-config
** Listing the failed packages (*:skipped / !:failed)
! mail/dovecot (dovecot-1.0.r22) (Permission denied)
---> Packages processed: 0 done, 0 ignored, 0 skipped and 1 failed
/usr/local/sbin/portupgrade:2084: [BUG] Segmentation fault
ruby 1.8.5 (2006-12-25) [i386-freebsd6]

Abort trap: 6 (core dumped)


Any ideas here?

- Julian

[ Julian C. Dunn <jdunn@xxxxxxxxxxxx> * "You can throw confetti, ]
[ WWW: www.aquezada.com/staff/julian * but you're still going ]
[ PGP: 91B3 7A9D 683C 7C16 715F * through the motions, baby" ]
[ 442C 6065 D533 FDC2 05B9 * - Aimee Mann ]
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