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/monitoring/loki/default.nix

@@ -0,0 +1,60 @@
+{ stdenv
+, lib
+, buildGoModule
+, fetchFromGitHub
+, makeWrapper
+, nixosTests
+, systemd
+}:
+
+buildGoModule rec {
+  version = "2.5.0";
+  pname = "grafana-loki";
+
+  src = fetchFromGitHub {
+    rev = "v${version}";
+    owner = "grafana";
+    repo = "loki";
+    sha256 = "sha256-3GeWrkTL3HJQsVBafjSQXHsf1nbVzSVSDZWcJlD22Nw=";
+  };
+
+  vendorSha256 = null;
+
+  subPackages = [
+    # TODO split every executable into its own package
+    "cmd/loki"
+    "cmd/loki-canary"
+    "clients/cmd/promtail"
+    "cmd/logcli"
+  ];
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = lib.optionals stdenv.isLinux [ systemd.dev ];
+
+  preFixup = lib.optionalString stdenv.isLinux ''
+    wrapProgram $out/bin/promtail \
+      --prefix LD_LIBRARY_PATH : "${lib.getLib systemd}/lib"
+  '';
+
+  passthru.tests = { inherit (nixosTests) loki; };
+
+  ldflags = let t = "github.com/grafana/loki/pkg/util/build"; in [
+    "-s"
+    "-w"
+    "-X ${t}.Version=${version}"
+    "-X ${t}.BuildUser=nix@nixpkgs"
+    "-X ${t}.BuildDate=unknown"
+    "-X ${t}.Branch=unknown"
+    "-X ${t}.Revision=unknown"
+  ];
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Like Prometheus, but for logs";
+    license = with licenses; [ agpl3Only asl20 ];
+    homepage = "https://grafana.com/oss/loki/";
+    maintainers = with maintainers; [ willibutz globin mmahut ];
+    platforms = platforms.unix;
+  };
+}