conda.nix

{ lib
, stdenv
, fetchurl
, runCommand
, makeWrapper
, buildFHSUserEnv
, libselinux
, libarchive
, libGL
, xorg
, zlib
# Conda installs its packages and environments under this directory
, installationPath ? "~/.conda"
# Conda manages most pkgs itself, but expects a few to be on the system.
, condaDeps ? [ stdenv.cc xorg.libSM xorg.libICE xorg.libX11 xorg.libXau xorg.libXi xorg.libXrender libselinux libGL zlib]
# Any extra nixpkgs you'd like available in the FHS env for Conda to use
, extraPkgs ? [ ]
}:

let
  version = "4.11.0";
  src = fetchurl {
      url = "https://repo.continuum.io/miniconda/Miniconda3-py39_${version}-Linux-x86_64.sh";
      sha256 = "sha256-TunDqlMynNemO0mHfAurtJsZt+WvKYB7eTp2vbHTYrQ=";
  };
in
  (let
      libPath = lib.makeLibraryPath [
        zlib # libz.so.1
      ];
    in
      runCommand "conda-install" { buildInputs = [ makeWrapper zlib]; }
        # on line 10, we have 'unset LD_LIBRARY_PATH'
        # we have to comment it out however in a way that the number of bytes in the
        # file does not change. So we replace the 'u' in the line with a '#'
        # The reason is that the binary payload is encoded as number
        # of bytes from the top of the installer script
        # and unsetting the library path prevents the zlib library from being discovered
        ''
          mkdir -p $out/bin
          sed 's/unset LD_LIBRARY_PATH/#nset LD_LIBRARY_PATH/' ${src} > $out/bin/miniconda-installer.sh
          chmod +x $out/bin/miniconda-installer.sh
          makeWrapper                            \
            $out/bin/miniconda-installer.sh      \
            $out/bin/conda-install               \
            --add-flags "-p ${installationPath}" \
            --add-flags "-b"                     \
            --prefix "LD_LIBRARY_PATH" : "${libPath}"
        '')