uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/servers/dns/ncdns/default.nix

@@ -0,0 +1,112 @@
+{ lib
+, buildGoModule
+, fetchFromGitHub
+, nixosTests
+, libcap
+}:
+
+let
+
+  # ncdns source
+  ncdns = fetchFromGitHub {
+    owner = "namecoin";
+    repo = "ncdns";
+    rev = "2a486311b0fe1a921af34aa3b31e6e4e0569accc";
+    sha256 = "01arwlycp1iia4bd3dgyn8dam1av2a7d9hv7f085n14l2i2aza7v";
+  };
+
+  # script to patch the crypto/x509 package
+  x509 = fetchFromGitHub {
+    owner = "namecoin";
+    repo = "x509-compressed";
+    rev = "fb9f2b7bc9fcba954d70f63857cc0c3841b1cf47";
+    sha256 = "1arkbpbzvhcmz5fhjqg34x2jbjnwmlisapk22rjki17qpamh7zks";
+    # ncdns must be put in a subdirectory for this to work.
+    postFetch = ''
+      cp -r --no-preserve=mode "${ncdns}" "$out/ncdns"
+    '';
+  };
+
+in
+
+buildGoModule {
+  pname = "ncdns";
+  version = "unstable-2020-07-18";
+
+  src = x509;
+
+  vendorSha256 = "02bqf6vkj5msk35sr5sklnqqd16n7gns7knzqslw077xrxiz7bsg";
+
+  # Override the go-modules fetcher derivation to apply
+  # upstream's patch of the crypto/x509 library.
+  modBuildPhase = ''
+    go mod init github.com/namecoin/x509-compressed
+    go generate ./...
+    go mod tidy
+
+    cd ncdns
+    go mod init github.com/namecoin/ncdns
+    go mod edit \
+      -replace github.com/coreos/go-systemd=github.com/coreos/go-systemd/v22@latest \
+      -replace github.com/namecoin/x509-compressed=$NIX_BUILD_TOP/source
+    go mod tidy
+  '';
+
+  # Copy over the lockfiles as well, because the source
+  # doesn't contain it. The fixed-output derivation is
+  # probably not reproducible anyway.
+  modInstallPhase = ''
+    mv -t vendor go.mod go.sum
+    cp -r --reflink=auto vendor "$out"
+  '';
+
+  buildInputs = [ libcap ];
+
+  # The fetcher derivation must run with a different
+  # $sourceRoot, but buildGoModule doesn't allow that,
+  # so we use this ugly hack.
+  unpackPhase = ''
+    runHook preUnpack
+
+    unpackFile "$src"
+    sourceRoot=$PWD/source/ncdns
+    chmod -R u+w -- "$sourceRoot"
+    cd $sourceRoot
+
+    runHook postUpack
+  '';
+
+  # Same as above: can't use `patches` because that would
+  # be also applied to the fetcher derivation, thus failing.
+  patchPhase = ''
+    runHook prePatch
+    patch -p1 < ${./fix-tpl-path.patch}
+    runHook postPatch
+  '';
+
+  preBuild = ''
+    chmod -R u+w vendor
+    mv -t . vendor/go.{mod,sum}
+  '';
+
+  preCheck = ''
+    # needed to run the ncdns test suite
+    ln -s $PWD/vendor ../../go/src
+  '';
+
+  postInstall = ''
+    mkdir -p "$out/share"
+    cp -r _doc "$out/share/doc"
+    cp -r _tpl "$out/share/tpl"
+  '';
+
+  meta = with lib; {
+    description = "Namecoin to DNS bridge daemon";
+    homepage = "https://github.com/namecoin/ncdns";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ rnhmjoj ];
+  };
+
+  passthru.tests.ncdns = nixosTests.ncdns;
+
+}