Add preliminary support for private dependencies using builtins.fetchGit

[adisbladis]

Add preliminary support for private dependencies using builtins.fetchGit

Using this API looks like:

buildGoApplication {
  srcOverrides = self: super: {
    "github.com/BurntSushi/toml" = super."github.com/BurntSushi/toml".override { private = true; };
  };
}

Outstanding issues:

• Nix has issues dealing with short revs ( https://github.com/NixOS/nix/issues/4694 )
• Param passing heuristics to fetchGit needs to be nailed down.

[cstrahan]

Nice!

Think you might be able to incorporate some of https://github.com/tweag/gomod2nix/pull/11 to resolve the full git rev/SHA?

[adisbladis]

I have started looking at adding short rev support to Nix so we don't have to add any more metadata.

[jgresty]

Is this patch waiting for upstream changes? Is there any other work that needs doing to support private repos other than what is outlined in this PR?

[pho]

Hi, just bumping this up to see if there is any reply to the previous comment questions :)