Add empty rust env

.envrc

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+use flake
+

.hgignore

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+.direnv
+

flake.lock

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+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1641205782,
+        "narHash": "sha256-4jY7RCWUoZ9cKD8co0/4tFARpWB+57+r1bLLvXNJliY=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b7547d3eed6f32d06102ead8991ec52ab0a4f1a7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1639947939,
+        "narHash": "sha256-pGsM8haJadVP80GFq4xhnSpNitYNQpaXk4cnA796Cso=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "2fc8ce9d3c025d59fee349c1f80be9785049d653",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1646470760,
+        "narHash": "sha256-dQISyucVCCPaFioUhy5ZgfBz8rOMKGI8k13aPDFTqEs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1fc7212a2c3992eedc6eedf498955c321ad81cc2",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1646470760,
+        "narHash": "sha256-dQISyucVCCPaFioUhy5ZgfBz8rOMKGI8k13aPDFTqEs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1fc7212a2c3992eedc6eedf498955c321ad81cc2",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs_2",
+        "utils": "utils"
+      }
+    },
+    "utils": {
+      "locked": {
+        "lastModified": 1644229661,
+        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "legdur: verify integrity of large directories over time";
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+    naersk.url = "github:nix-community/naersk";
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+  };
+
+  outputs = { self, nixpkgs, utils, naersk, flake-compat }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages."${system}";
+        naersk-lib = naersk.lib."${system}";
+      in rec {
+        # `nix build`
+        packages.legdur = naersk-lib.buildPackage {
+          pname = "legdur";
+          root = ./.;
+        };
+        defaultPackage = packages.legdur;
+
+        # `nix run`
+        apps.legdur = utils.lib.mkApp { drv = packages.legdur; };
+        defaultApp = apps.legdur;
+
+        # `nix develop`
+        devShell = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            cacert
+            cargo
+            cargo-edit
+            cargo-outdated
+            cargo-release
+            cargo-tarpaulin
+            cargo-watch
+            clippy
+            git
+            llvmPackages_13.llvm
+            nixpkgs-fmt
+            openssh
+            openssl
+            pkg-config
+            rustc
+            rustfmt
+          ];
+          RUST_SRC_PATH =
+            "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+        };
+      });
+}

shell.nix

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+(import
+  (
+    let
+      lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    in
+    fetchTarball {
+      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  {
+    src = ./.;
+  }).shellNix
+