Initial commit

examples/fenix/flake.nix

@@ -0,0 +1,51 @@
+{
+  description = "An example of a shell environment with a Fenix toolchain";
+
+  inputs = {
+    rust.url = "git+https://forgejo.alt0r.com/braunse/rust-part";
+    nixpkgs.follows = "rust/nixpkgs";
+    parts.follows = "rust/parts";
+    rustManifest.follows = "rust/rustManifest";
+  };
+
+  outputs = inputs: inputs.parts.lib.mkFlake { inherit inputs; } {
+    imports = [ inputs.rust.flakeModules.fenix ];
+
+    systems = [ "x86_64-linux" ];
+
+    rust.fenix.manifestFile = inputs.rustManifest;
+    rust.fenix.components = [ "rustfmt" ];
+    rust.fenix.targetComponents.wasm32-unknown-unknown = [ "rust-std" ];
+
+    perSystem =
+      { pkgs, fenixToolchain, ... }: {
+        checks = {
+          haveRustChain = pkgs.stdenv.mkDerivation {
+            name = "check-rust-toolchain-is-present";
+            dontUnpack = true;
+            buildPhase = ''
+              set -euo pipefail
+
+              echo "Checking for cargo" >&2
+              ${fenixToolchain}/bin/cargo --version >/dev/null
+
+              echo "Checking for rustc" >&2
+              ${fenixToolchain}/bin/rustc --version >/dev/null
+
+              echo "Checking for rustfmt" >&2
+              ${fenixToolchain}/bin/rustfmt --version >/dev/null
+
+              echo "Checking compiler compiles natively" >&2
+              touch lib.rs
+              ${fenixToolchain}/bin/rustc --crate-type rlib --crate-name nativechecklib lib.rs
+
+              echo "Checking compiler compiles for wasm32-unknown-unknown" >&2
+              ${fenixToolchain}/bin/rustc --crate-type rlib --crate-name crosschecklib --target wasm32-unknown-unknown lib.rs
+
+              touch $out
+            '';
+          };
+        };
+      };
+  };
+}