depot/third_party/nixpkgs/pkgs/development/compilers/go/binary.nix

{ lib, stdenv, fetchurl, version, hashes }:
let
  toGoKernel = platform:
    if platform.isDarwin then "darwin"
    else platform.parsed.kernel.name;

  toGoCPU = platform: {
    "i686" = "386";
    "x86_64" = "amd64";
    "aarch64" = "arm64";
    "armv6l" = "armv6l";
    "armv7l" = "armv6l";
    "powerpc64le" = "ppc64le";
  }.${platform.parsed.cpu.name} or (throw "Unsupported CPU ${platform.parsed.cpu.name}");

  toGoPlatform = platform: "${toGoKernel platform}-${toGoCPU platform}";

  platform = toGoPlatform stdenv.hostPlatform;
in
stdenv.mkDerivation rec {
  name = "go-${version}-${platform}-bootstrap";

  src = fetchurl {
    url = "https://golang.org/dl/go${version}.${platform}.tar.gz";
    sha256 = hashes.${platform} or (throw "Missing Go bootstrap hash for platform ${platform}");
  };

  # We must preserve the signature on Darwin
  dontStrip = stdenv.hostPlatform.isDarwin;

  installPhase = ''
    runHook preInstall
    mkdir -p $out/share/go $out/bin
    mv bin/* $out/bin
    cp -r . $out/share/go
    ${lib.optionalString stdenv.isLinux (''
    patchelf \
      --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
      $out/bin/go
    '')}
    runHook postInstall
  '';
}