DragonFlyBSD

In at least one sense, you have such.

Not sure if you can do this by escaping to the CLI and skipping the
steps below, but will try it later today.

Meanwhile, even if so, it might be easier to:

- Simply ignore or reserve adequate space on partitions, slices,
separate devices, or any combination thereof.

- Do a minimal/full/intermediate install to UFS - not using the space
set aside.

- After you have the full system with all its tools up and running, use
the hammer utils to create and mount hammer partitions in the
space/devices you reserved, and in the manner you prefer.

Thereafter, moving the system itself into hammer may or may not be on
your radar.

CAVEAT: pfs and nullfs seem to very much have their uses. Omitting them
is not necessarily the best thing. OTOH, it is at least as easy to add
them as to remove them. Especially if already populated..

;-)

Personally, I expect to reserve hammer mounts for client apps, R&D,
backing store etc. on large media, and keep the 'system' on UFS in space
too small for effective hammer use anyway.

My system areas - the '/' binaries, '/usr', '/var', have never needed
much in the way of snapshots and the like.

YMMV,

Bill