flake.nix

{
  description = "The Sourcegraph developer environment Nix Flake";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-22.11";
  };

  outputs = { self, nixpkgs }:
    {
      devShells = nixpkgs.lib.genAttrs
        [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ]
        (system:
          let
            pkgs = import nixpkgs {
              inherit system;
              overlays = [ self.overlays.ctags ];
            };
          in
          {
            default = import ./shell.nix { inherit pkgs; };
          }
        );
      # Pin a specific version of universal-ctags to the same version as in cmd/symbols/ctags-install-alpine.sh.
      overlays.ctags = self: super: rec {
        universal-ctags = super.universal-ctags.overrideAttrs (old: {
          version = "5.9.20220403.0";
          src = super.fetchFromGitHub {
            owner = "universal-ctags";
            repo = "ctags";
            rev = "f95bb3497f53748c2b6afc7f298cff218103ab90";
            sha256 = "sha256-pd89KERQj6K11Nue3YFNO+NLOJGqcMnHkeqtWvMFk38=";
          };
          # disable checks, else we get `make[1]: *** No rule to make target 'optlib/cmake.c'.  Stop.`
          doCheck = false;
          checkFlags = [ ];
        });
      };

      # recursiveUpdate is just for recursively merging sets
      packages = nixpkgs.lib.recursiveUpdate
        {
          x86_64-linux.p4-fusion-portable = self.packages.x86_64-linux.p4-fusion.overrideAttrs (oldAttrs: {
            # patch the ELF interpreter for non-nix(os) distros.
            postFixup = ''
              patchelf \
                --set-interpreter /lib64/ld-linux-x86-64.so.2 \
                $out/bin/p4-fusion
            '';
          });
        }
        (
          nixpkgs.lib.genAttrs [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ] (system:
            let pkgs = import nixpkgs { inherit system; };
            in
            {
              p4-fusion = pkgs.callPackage ./dev/nix/p4-fusion.nix { };
            }
          )
        );
    };
}