distro/pkg/nix: add

- Support is in apkg master now.
- The generated default.nix is exactly as in the distro:
  https://github.com/NixOS/nixpkgs/blob/master/pkgs/servers/dns/knot-resolver/default.nix
  (except for new version+hash, and one test needed a tweak since 5.3.2)

diff --git a/distro/pkg/nix/default.nix b/distro/pkg/nix/default.nix
new file mode 100644 (file)
index 0000000..af42fa8
--- /dev/null
+++ b/distro/pkg/nix/default.nix
@@ -0,0 +1,125 @@
+{ lib, stdenv, fetchurl
+# native deps.
+, runCommand, pkg-config, meson, ninja, makeWrapper
+# build+runtime deps.
+, knot-dns, luajitPackages, libuv, gnutls, lmdb
+, systemd, libcap_ng, dns-root-data, nghttp2 # optionals, in principle
+# test-only deps.
+, cmocka, which, cacert
+, extraFeatures ? false /* catch-all if defaults aren't enough */
+}:
+let # un-indented, over the whole file
+
+result = if extraFeatures then wrapped-full else unwrapped;
+
+inherit (lib) optional optionals optionalString;
+lua = luajitPackages;
+
+unwrapped = stdenv.mkDerivation rec {
+  pname = "knot-resolver";
+  version = "{{ version }}";
+
+  src = fetchurl {
+    url = "https://secure.nic.cz/files/knot-resolver/${pname}-${version}.tar.xz";
+    sha256 = "{{ src_hash }}";
+  };
+
+  outputs = [ "out" "dev" ];
+
+  # Path fixups for the NixOS service.
+  postPatch = ''
+    patch meson.build <<EOF
+    @@ -50,2 +50,2 @@
+    -systemd_work_dir = prefix / get_option('localstatedir') / 'lib' / 'knot-resolver'
+    -systemd_cache_dir = prefix / get_option('localstatedir') / 'cache' / 'knot-resolver'
+    +systemd_work_dir  = '/var/lib/knot-resolver'
+    +systemd_cache_dir = '/var/cache/knot-resolver'
+    EOF
+
+    # ExecStart can't be overwritten in overrides.
+    # We need that to use wrapped executable and correct config file.
+    sed '/^ExecStart=/d' -i systemd/kresd@.service.in
+  ''
+    # some tests have issues with network sandboxing, apparently
+  + optionalString doInstallCheck ''
+    echo 'os.exit(77)' > daemon/lua/trust_anchors.test/bootstrap.test.lua
+    sed -E '/^[[:blank:]]*test_(dstaddr|headers),?$/d' -i \
+      tests/config/doh2.test.lua modules/http/http_doh.test.lua
+  '';
+
+  preConfigure = ''
+    patchShebangs scripts/
+  '';
+
+  nativeBuildInputs = [ pkg-config meson ninja ];
+
+  # http://knot-resolver.readthedocs.io/en/latest/build.html#requirements
+  buildInputs = [ knot-dns lua.lua libuv gnutls lmdb ]
+    ++ optionals stdenv.isLinux [ systemd libcap_ng ]
+    ++ [ nghttp2 ]
+    ## optional dependencies; TODO: dnstap
+    ;
+
+  mesonFlags = [
+    "-Dkeyfile_default=${dns-root-data}/root.ds"
+    "-Droot_hints=${dns-root-data}/root.hints"
+    "-Dinstall_kresd_conf=disabled" # not really useful; examples are inside share/doc/
+    "--default-library=static" # not used by anyone
+  ]
+  ++ optional doInstallCheck "-Dunit_tests=enabled"
+  ++ optional (doInstallCheck && !stdenv.isDarwin) "-Dconfig_tests=enabled"
+  ++ optional stdenv.isLinux "-Dsystemd_files=enabled" # used by NixOS service
+    #"-Dextra_tests=enabled" # not suitable as in-distro tests; many deps, too.
+  ;
+
+  postInstall = ''
+    rm "$out"/lib/libkres.a
+    rm "$out"/lib/knot-resolver/upgrade-4-to-5.lua # not meaningful on NixOS
+  '' + optionalString stdenv.targetPlatform.isLinux ''
+    rm -r "$out"/lib/sysusers.d/ # ATM more likely to harm than help
+  '';
+
+  doInstallCheck = with stdenv; hostPlatform == buildPlatform
+    && !(isDarwin && isAarch64); # avoid luarocks, as it's broken ATM on the platform
+  installCheckInputs = [ cmocka which cacert lua.cqueues lua.basexx lua.http ];
+  installCheckPhase = ''
+    meson test --print-errorlogs
+  '';
+
+  meta = with lib; {
+    description = "Caching validating DNS resolver, from .cz domain registry";
+    homepage = "https://knot-resolver.cz";
+    license = licenses.gpl3Plus;
+    platforms = platforms.unix;
+    maintainers = [ maintainers.vcunat /* upstream developer */ ];
+  };
+};
+
+wrapped-full = runCommand unwrapped.name
+  {
+    nativeBuildInputs = [ makeWrapper ];
+    buildInputs = with luajitPackages; [
+      # For http module, prefill module, trust anchor bootstrap.
+      # It brings lots of deps; some are useful elsewhere (e.g. cqueues).
+      http
+      # psl isn't in nixpkgs yet, but policy.slice_randomize_psl() seems not important.
+    ];
+    preferLocalBuild = true;
+    allowSubstitutes = false;
+  }
+  ''
+    mkdir -p "$out"/bin
+    makeWrapper '${unwrapped}/bin/kresd' "$out"/bin/kresd \
+      --set LUA_PATH  "$LUA_PATH" \
+      --set LUA_CPATH "$LUA_CPATH"
+
+    ln -sr '${unwrapped}/share' "$out"/
+    ln -sr '${unwrapped}/lib'   "$out"/ # useful in NixOS service
+    ln -sr "$out"/{bin,sbin}
+
+    echo "Checking that 'http' module loads, i.e. lua search paths work:"
+    echo "modules.load('http')" > test-http.lua
+    echo -e 'quit()' | env -i "$out"/bin/kresd -a 127.0.0.1#53535 -c test-http.lua
+  '';
+
+in result

diff --git a/distro/pkg/nix/top-level.nix b/distro/pkg/nix/top-level.nix
new file mode 100644 (file)
index 0000000..911e5f0
--- /dev/null
+++ b/distro/pkg/nix/top-level.nix
@@ -0,0 +1,7 @@
+with import <nixpkgs> {};
+
+(callPackage ./. {
+}).overrideAttrs (attrs: {
+  src = ./knot-resolver-{{ version }}.tar.xz;
+})
+