I apologize if the question is too trivial, but what is a sensible way to update the NetBSD installation inside a pkg_comp chroot?1) don't. rebuild instead, and script the whole creation process. keep your binary packages outside anyway 2) see sysutils/etcmanage and read the scripts that come with it very carefully. INSTALL-NetBSD does an in-place update of a running system. I would choose 1 for pkg_comp chroots.
Indeed, 1 is the easiest way. In the end, you only need an up to date mk.conf and resolv.conf in your pkg_comp chroot to be good.
Nicolas