Build private packages in pbulk with dependencies from public repo?

["J. Lewis Muir" <jlmuir%imca-cat.org@localhost>]

Hello!

I'd like to use pbulk to build my private packages, but I'd love it if
pbulk didn't need to build all the dependent packages that already exist
in a public binary repository.  Is there a way to make pbulk download
and use binary packages from a public repository if they exist rather
than build them itself?

For example, say I'm running macOS Sierra, and I'm using Joyent's
pkgbuild ([1]) which uses pbulk, and I have a set of private packages
that I want pbulk to build.  I know that Joyent maintains a binary
package repository at [2], and I'd like pbulk to use it to obtain any
dependent packages of the private packages it's building.  So, if I have
a private package that depends on lang/ruby23-base, I'd like pbulk to
just fetch the latest ruby23-base package from the Joyent repository and
install it in the chroot, and then proceed with building the private
package.

If it can't do this, then perhaps I could do some kind of hack where
I make pkgsrc print a recursive list of dependencies for my private
packages and then fetch the packages from the binary package repository
into my local pbulk package repository.  But I'm hoping there's a better
way.

Thanks!

Lewis

[1] https://github.com/joyent/pkgbuild
[2] https://pkgsrc.joyent.com/packages/Darwin/trunk/x86_64/