To create large sets of binary packages, pkgsrc uses the pbulk tool.

pbulk is designed to build packages in bulk in a chroot sandbox (which may be based on an older NetBSD release, a 32-bit release on a 64-bit machine, or similar).

However, managing multiple pbulk installations on a single machine can quickly become unwieldy.

It would be nice to have a web frontend for managing pbulk, restarting builds, creating new build sandboxes based on different NetBSD versions and package sets, etc.

For an example of a typical high-performance pbulk setup used on "large" hardware, see Nia's pbulk scripts. Notably, these include chroot management and can be used to build packages for multiple NetBSD (and pkgsrc) versions simultaneously by using different "base directories".