[Nix-dev] Including binary-only derivation in nixops deploy.

[Kevin Cox]

Hello all. I have a possibly strange question but I was hoping that you
could help me out. I am currently using nixops to manage a couple of
servers and have a couple custom derivations for personal packages.
While managing the derivation in my nixops config isn't terrible I
wanted to manage the derivations in each project so that I can use nix
to build the project in CI and use nix-shell for development. Another
benefit of using a binary is that I know that dependencies won't
change, and that the package has been tested with the exact
dependencies it will be shipping to production.

So long story short I have uploaded the derivation to a binary cache
and I was hoping to use it in a nixops deploy. However I can't figure
out how to get it to work (if it is possible). `nix-store
-r /nix/store/01kymbkb0a1sc99y72wzn5b4gcjdlbnm-dontsayit-nginx` works
fine, the package and all of its dependencies are installed to the
local store. However I can't figure out how to use it in a nixops
config.

The naive approach of just including the path in a file (in my case an
nginx config) doesn't work as it isn't being scanned for that path and
the dependency doesn't get picked up. Interpolating it as a path also
doesn't work as the file gets copied from the store and put into the
store under a different hash, losing all dependency information.

I tried playing around with .drv descriptions but couldn't figure out
how to get it to work either.

I would appreciate any help or recommendations for alternative
solutions.
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