Merge pull request #131 from urbit/eamsden/nix-ci

Use Nix shell in CI

.github/workflows/ares-shared.yml

@@ -3,6 +3,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  ACTIONS_ALLOW_UNSECURE_COMMANDS: "true"
 
 defaults:
   run:
@@ -14,29 +15,34 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      # Makes it easier to determine why CI might differ from local linter/build
-      #
-      - name: Version
-        run: rustc --version
+      # Install nix, required by nix-shell-action
+      - uses: cachix/install-nix-action@v23
+        name: Install Nix
+        with:
+          extra_nix_config: "extra-experimental-features = nix-command flakes"
 
+      # Check formatting
       - name: Format
-        run: cargo fmt --check
+        run: |
+          nix develop --command bash -c "cargo fmt --check"
 
       # See clippy linter docs: https://github.com/rust-lang/rust-clippy
       #
       # First linter is set to fail for all warnings, then ignored warnings are
       # explicitly listed
       #
+      # XX TODO make a script with all the flags for the linter
       - name: Lint
         run: |
-          cargo clippy \
-            --all-targets \
-            --no-deps \
-            -- -D warnings \
-            -A clippy::missing_safety_doc
+          nix develop --command bash -c "cargo clippy --all-targets --no-deps -- -D warnings -A clippy::missing_safety_doc"
 
+      # Build Ares
       - name: Build
-        run: cargo build --release --verbose --features check_all
+        run: |
+          nix develop --command bash -c "cargo build --release --verbose --features check_all"
+
+      # Run tests
+      - name: Test
+        run: |
+          nix develop --command bash -c "cargo test --verbose -- --test-threads=1"
 
-      - name: Run tests
-        run: cargo test --verbose -- --test-threads=1

rust/flake.nix

@@ -0,0 +1,33 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {self, fenix, flake-utils, nixpkgs}: 
+    let supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-darwin"];
+    in flake-utils.lib.eachSystem supportedSystems
+    (system:
+      let pkgs = import nixpkgs { inherit system; };
+      in { devShells.default = pkgs.mkShell {
+          buildInputs = [
+            (fenix.packages.${system}.complete.withComponents [
+              "cargo"
+              "clippy"
+              "rustc"
+              "rustfmt"
+              "rust-src"
+            ])
+            pkgs.cargo-watch
+            pkgs.gdb
+            pkgs.iconv
+          ];
+        };
+      }
+    );
+}
+