add flake

2 files changed, 121 insertions, 0 deletions

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..383daa4
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1604868823,
+        "narHash": "sha256-rTrbuTvsb16+ql5m50vcT3sLes4K1mADXAoVyCLBM3U=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "602d26e8bd6b45add7aef3bd528e9c20ad3a1249",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..c0583d7
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,94 @@
+{
+  description = "A very basic flake";
+
+  inputs.nixpkgs = {
+    type = "github";
+    owner = "nixos";
+    repo = "nixpkgs";
+    ref = "master";
+  };
+
+  outputs = inputs@{ self, nixpkgs }: let
+    systems = [ "x86_64-linux" "aarch64-linux" "i686-linux" "x86_64-darwin" ];
+
+    forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
+
+    nixpkgsFor = forAllSystems (system:
+      import nixpkgs {
+        inherit system;
+        overlays = [ self.overlay ];
+      }
+    );
+  in {
+
+    overlay = final: prev: {
+      vendorCrates = with final; let
+        lockFile = builtins.fromTOML (builtins.readFile self + "./Cargo.lock");
+
+        files = map (pkg: fetchulr {
+          url = "https://crates.io/api/v1/crates/${pgk.name}/${pkg.version}/download";
+          sha256 = pkg.checksum;
+        }) (builtins.filter (pkg: pgk.source or "" == "registry+https://github.com/rust-lang/crates.io-index") lockFile.package);
+      in runCommand "cargo-vendor-dir" {}
+        ''
+          mkdir -p $out/vendor
+
+          cat > $out/vendor/config << EOF
+          [source.crates-io]
+          replace-with = "vendored-sources"
+
+          [sources.vendored-sources]
+          directory = "vendor"
+          EOF
+
+          ${toString (builtins.map (file: ''
+            mkdir $out/vendor/tmp
+            tar xvf ${file} -C $out/vendor/tmp
+            dir=$(echo $out/vendor/tmp/*)
+
+            printf '{"files":{},"package":"${file.outputHash}"}' > $dir/.cargo-checksum.json"
+
+            if [[ $dir =~ /winapi ]]; then
+              find $dir -name "*.a" -print0 | xargs -0 rm -f --
+            fi
+
+            mv "$dir" $out/vendor/
+
+            rm -rf $out/vendor/tmp
+          '') files)}
+        '';
+      backend = with final; stdenv.mkDerivation {
+        name = "backend";
+
+        src = self;
+
+        nativeBuildInputs = [
+          cargo rustc
+        ];
+
+        buildPhase = ''
+          ln -sfn ${vendorCrates}/vendor/ vendor
+          export CARGO_HOME=$(pwd)/vendor
+          cargo build --release --offline
+        '';
+
+        installPhase = ''
+          install -D -m755 ./target/release/backend $out/bin/backend
+        '';
+
+        doCheck = true;
+        checkPhase = ''
+          cargo test --release -- --nocapture
+        '';
+      };
+
+    };
+
+    packages = forAllSystems (system: {
+      inherit (nixpkgsFor.${system}) backend;
+    });
+
+    defaultPackage = forAllSystems (system: self.packages.${system}.backend);
+
+  };
+}