Motivation for this change

Thanks for including vector in nixpkgs.

I've only just started using vector, but I'd argue that the version built on Hydra should contain features "sources", "sinks" and "transforms" in order for it to be attractive to substitute from cache.nixos.org.

At first, this change raised the closure-size from 60MB -> 1217MB ! Apparently due to maxmindb.so including references to rustc. Since I have no easy way of debugging this nor testing geoip-transform for that matter, I decided to just patch out the geoip-transform from Cargo.toml for now. Not the best solution, but maybe safer than a blind remove-references-to rustc without knowing the consequences.

Let me hear what you think. :)

cc @thoughtpolice

PS. without the geo-ip transform, the change in path size is:

# before
/nix/store/hr3lpixb226r1656dgavqilj2a4hh1m2-vector-0.10.0          62944896

# after
/nix/store/2fcf8pvm5nddvplk4i96njjlxswh252a-vector-0.10.0         109147488

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.