add a flake template for rust binaries

flake.nix

@@ -290,6 +290,12 @@
           path = ./templates/python-data;
           description = "python environment for data processing";
         };
+        rust = {
+          # initialize with:
+          # - `nix flake init -t '/home/colin/dev/nixos/#rust'`
+          path = ./templates/rust;
+          description = "rust package and development environment";
+        };
       };
     };
 }

templates/rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "example-rust-pkg"
+version = "0.1.0"

templates/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "example-rust-pkg"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

templates/rust/flake.lock

@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1681202837,
+        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1682173319,
+        "narHash": "sha256-tPhOpJJ+wrWIusvGgIB2+x6ILfDkEgQMX0BTtM5vd/4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ee7ec1c71adc47d2e3c2d5eb0d6b8fbbd42a8d1c",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-22.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

templates/rust/flake.nix

@@ -0,0 +1,45 @@
+{
+  description = "TODO: FILLME: description";
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-22.11";
+    flake-utils.url = github:numtide/flake-utils;
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    with flake-utils.lib; eachSystem allSystems (system:
+    let
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+      nativeBuildInputs = with pkgs; [
+        pkg-config
+      ];
+      buildInputs = with pkgs; [
+        openssl
+      ];
+    in rec {
+      packages = {
+        # docs: <nixpkgs>/doc/languages-frameworks/rust.section.md
+        example-rust-pkg = pkgs.rustPlatform.buildRustPackage {
+          name = "example-rust-pkg";
+          src = ./.;
+          cargoLock.lockFile = ./Cargo.lock;
+          # enables debug builds, if we want: https://github.com/NixOS/nixpkgs/issues/60919.
+          hardeningDisable = [ "fortify" ];
+          inherit buildInputs nativeBuildInputs;
+        };
+      };
+      defaultPackage = packages.example-rust-pkg;
+
+      devShells.default = with pkgs; mkShell {
+        # enables debug builds, if we want: https://github.com/NixOS/nixpkgs/issues/60919.
+        hardeningDisable = [ "fortify" ];
+
+        # Allow cargo to download crates.
+        SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+
+        inherit buildInputs;
+        nativeBuildInputs = [ cargo ] ++ nativeBuildInputs;
+      };
+    });
+}

templates/rust/src/main.rs

@@ -0,0 +1,5 @@
+//! hello world
+
+pub fn main() {
+    println!("hello, world!");
+}