This allows us to use rules_docker from NixOS. However, the built
binaries are broken because of the Docker base image not being NixOS
based.
Change-Id: I29b93f1bae1575b04f97265c67497081d11a1910
This introduces Nix, the package manager, and nixpkgs, the package
collection, into hscloud's bazel build machinery.
There are two reasons behind this:
- on NixOS, it's painful or at least very difficult to run hscloud out
of the box. Especially with rules_go, that download a blob from the
Internet to get a Go toolchain, it just fails outright. This solves
this and allows hscloud to be used on NixOS.
- on non-NixOS platforms that still might have access to Nix this
allows to somewhat hermeticize the build. Notably, Python now comes
from nixpkgs, and is fabricobbled in a way that makes pip3_import
use Nix system dependencies for ncurses and libpq.
This has been tested to run ci_presubmit on NixOS 20.09pre and Gentoo
~amd64.
Change-Id: Ic16e4827cb52a05aea0df0eed84d80c5e9ae0e07
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