Static hosting of substitutes

[Ian Eure]

Hi folks,

I’d like to provide substitutes for packages in my personal 
channel.  The ideal setup for this would be for a machine on my 
internal net to perform the builds, then upload the results to 
another system on the open internet.  That could be a machine 
running a web server pointed at a directory where the NARs get 
uploaded, or an S3-like object store, or something like that -- 
dirt simple, just shifting bytes off disk and out a socket.

It seems that nothing like this exists, all the public substitute 
servers appear to use `guix publish'.  That’s not an option for 
me, since it requires significantly more disk and compute than I 
have on any public-facing system, and I can’t justify the cost of 
bigger machines.

What would it take to make a system like this work?

Thanks,

 — Ian