custom.nix

   1 { pkgs ? import <nixpkgs> {} }: with pkgs;
   2
   3 let
   4   mkDhallVersion =
   5     version: sha256:
   6       stdenv.mkDerivation {
   7         name = "dhall-${version}";
   8         inherit version;
   9         src = fetchurl {
  10           url = "https://github.com/dhall-lang/dhall-haskell/releases/download/${version}/dhall-${version}-x86_64-linux.tar.bz2";
  11           inherit sha256;
  12         };
  13         unpackPhase = ''
  14           tar -xjf $src
  15         '';
  16         installPhase = ''
  17           mkdir -p $out/bin
  18           mv bin/dhall $out/bin/
  19         '';
  20       };
  21 in
  22 {
  23   dhall = mkDhallVersion "1.34.0" "0n64jkgbv7a3cmlv3gxpgc11p9b5w0k9nc0zm9am2pzmp6vm6b4n";
  24 }