man-pages: provide simple install check

  stdenv,

  fetchurl,

  directoryListingUpdater,

  man,

}:

stdenv.mkDerivation (finalAttrs: {

    hash = "sha256-3aou2i6NKG++wiHRFfEtP/9dNsxQZs3+zI0koljVixk=";

  };

  nativeInstallCheckInputs = [ man ];

  dontBuild = true;

  enableParallelInstalling = true;

  doInstallCheck = true;

  makeFlags = [

    "-R"

    export DISTDATE="$(date --utc --date="@$SOURCE_DATE_EPOCH")"

  '';

  installCheckPhase = ''

    runHook preInstallCheck

    # Check for a few well‐known man pages

    for page in ldd write printf null hosts random ld.so; do

      man -M "$out/share/man" -P cat "$page" >/dev/null

    done

    runHook postInstallCheck

  '';

  passthru.updateScript = directoryListingUpdater {

    url = "https://www.kernel.org/pub/linux/docs/man-pages/";

  };