add ci configuration

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: "Test"
+on:
+  pull_request:
+  push:
+  schedule:
+    - cron:  '51 2 * * *'
+jobs:
+  tests:
+    strategy:
+      matrix:
+        nixPath:
+          - nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-20.09.tar.gz
+          - nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz
+        os: [ ubuntu-latest, macos-latest ]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: cachix/install-nix-action@v12
+    - name: build
+      run: NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz nix-build

default.nix

@@ -1,31 +1,2 @@
-{ stdenv
-, nixFlakes
-, meson
-, cmake
-, ninja
-, pkg-config
-, boost
-, nlohmann_json
-, srcDir ? ./.
-}:
-
-stdenv.mkDerivation rec {
-  pname = "hydra-eval-jobs";
-  version = "0.0.1";
-  src = srcDir;
-  buildInputs = [
-    nlohmann_json nixFlakes boost
-  ];
-  nativeBuildInputs = [
-    meson pkg-config ninja
-    # nlohmann_json can be only discovered via cmake files
-    cmake
-  ];
-  meta = with stdenv.lib; {
-    description = "Hydra's builtin hydra-eval-jobs as a standalone";
-    homepage = "https://github.com/Mic92/hydra-eval-jobs";
-    license = licenses.mit;
-    maintainers = with maintainers; [ mic92 ];
-    platforms = platforms.unix;
-  };
-}
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.callPackage ./hydra.nix {}

hydra.nix

@@ -0,0 +1,35 @@
+{ stdenv
+, nixFlakes
+, meson
+, cmake
+, ninja
+, pkg-config
+, boost
+, nlohmann_json
+, srcDir ? ./.
+}:
+
+let
+  filterMesonBuild = dir: builtins.filterSource
+    (path: type: type != "directory" || baseNameOf path != "build") dir;
+in
+stdenv.mkDerivation rec {
+  pname = "hydra-eval-jobs";
+  version = "0.0.1";
+  src = filterMesonBuild srcDir;
+  buildInputs = [
+    nlohmann_json nixFlakes boost
+  ];
+  nativeBuildInputs = [
+    meson pkg-config ninja
+    # nlohmann_json can be only discovered via cmake files
+    cmake
+  ];
+  meta = with stdenv.lib; {
+    description = "Hydra's builtin hydra-eval-jobs as a standalone";
+    homepage = "https://github.com/Mic92/hydra-eval-jobs";
+    license = licenses.mit;
+    maintainers = with maintainers; [ mic92 ];
+    platforms = platforms.unix;
+  };
+}