core/pkgs/by-name/ma/man-db/default.nix

{
  buildPackages,
  db,
  fetchurl,
  groff,
  gzip,
  lib,
  libiconv,
  libpipeline,
  makeWrapper,
  pkg-config,
  stdenv,
  zstd,
  autoreconfHook,
# for passthru.tests
# , nixosTests
}:

stdenv.mkDerivation rec {
  pname = "man-db";
  version = "2.12.1";

  src = fetchurl {
    url = "mirror://savannah/man-db/man-db-${version}.tar.xz";
    hash = "sha256-3e4kna63jPkrq3lMzQacyLV1mSJl6iDiOeiHFW6IAmU=";
  };

  outputs = [
    "out"
    "doc"
  ];
  outputMan = "out"; # users will want `man man` to work

  strictDeps = true;
  nativeBuildInputs = [
    autoreconfHook
    groff
    makeWrapper
    pkg-config
    zstd
  ];
  buildInputs = [
    libpipeline
    db
    groff
  ]; # (Yes, 'groff' is both native and build input)
  nativeCheckInputs = [
    libiconv # for 'iconv' binary
  ];

  patches = [ ./systemwide-man-db-conf.patch ];

  postPatch = ''
    # Remove all mandatory manpaths. Nixpkgs makes no requirements on
    # these directories existing.
    sed -i 's/^MANDATORY_MANPATH/# &/' src/man_db.conf.in

    # Add Nix-related manpaths
    echo "MANPATH_MAP	/nix/var/nix/profiles/default/bin	/nix/var/nix/profiles/default/share/man" >> src/man_db.conf.in

    # Add mandb locations for the above
    echo "MANDB_MAP	/nix/var/nix/profiles/default/share/man	/var/cache/man/nixpkgs" >> src/man_db.conf.in
  '';

  configureFlags =
    [
      "--disable-setuid"
      "--disable-cache-owner"
      "--localstatedir=/var"
      "--with-config-file=${placeholder "out"}/etc/man_db.conf"
      "--with-systemdtmpfilesdir=${placeholder "out"}/lib/tmpfiles.d"
      "--with-systemdsystemunitdir=${placeholder "out"}/lib/systemd/system"
      "--with-pager=less"
    ]
    ++ lib.optionals stdenv.hostPlatform.isDarwin [
      "ac_cv_func__set_invalid_parameter_handler=no"
      "ac_cv_func_posix_fadvise=no"
      "ac_cv_func_mempcpy=no"
    ];

  preConfigure = ''
    configureFlagsArray+=("--with-sections=1 n l 8 3 0 2 5 4 9 6 7")
  '';

  postInstall = ''
    # apropos/whatis uses program name to decide whether to act like apropos or whatis
    # (multi-call binary). `apropos` is actually just a symlink to whatis. So we need to
    # make sure that we don't wrap symlinks (since that changes argv[0] to the -wrapped name)
    find "$out/bin" -type f | while read file; do
      wrapProgram "$file" \
        --prefix PATH : "${
          lib.makeBinPath [
            groff
            gzip
            zstd
          ]
        }"
    done
  '';

  disallowedReferences = lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
    buildPackages.groff
  ];

  enableParallelBuilding = true;

  doCheck =
    !stdenv.hostPlatform.isMusl # iconv binary
  ;

  # passthru.tests = {
  #   nixos = nixosTests.man;
  # };

  meta = with lib; {
    homepage = "http://man-db.nongnu.org";
    description = "An implementation of the standard Unix documentation system accessed using the man command";
    license = licenses.gpl2;
    platforms = lib.platforms.unix;
    mainProgram = "man";
  };
}