Use a nix flake with oxalica/rust-overlay instead of a shell.nix

.envrc

@@ -1 +1 @@
-use nix
+use flake

flake.lock

@@ -0,0 +1,67 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1614513358,
+        "narHash": "sha256-LakhOx3S1dRjnh0b5Dg3mbZyH0ToC9I8Y2wKSkBaTzU=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5466c5bbece17adaab2d82fae80b46e807611bf3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1617042094,
+        "narHash": "sha256-c8w5/Dz+r8gHIGZs1BHJPSzpP3Sga/BYebRkqBoDANY=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "310885ec804f9fa0db5c705c7f5d35d415f50564",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-20.09",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1617071065,
+        "narHash": "sha256-9JXhxwlc/ZJaO4aZ3cUwQwlK7ZRamjV+BvOTvdXrggs=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "38766381042021f547a168ebb3f10305dc6fde08",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,37 @@
+{
+  description = "tlater.net web server";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-20.09";
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        flake-utils.follows = "flake-utils";
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+  };
+
+  outputs = { self, nixpkgs, flake-utils, rust-overlay }@inputs:
+    flake-utils.lib.simpleFlake {
+      inherit self nixpkgs;
+      name = "tlaternet";
+      preOverlays = [ rust-overlay.overlay ];
+
+      shell = { pkgs }:
+        let
+          rust_channel =
+            pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        in pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            (rust_channel.override {
+              extensions =
+                [ "rust-src" "rust-analysis" "rust-analyzer-preview" ];
+            })
+            pkgconfig
+          ];
+          buildInputs = with pkgs; [ openssl ];
+        };
+    };
+}

rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"

shell.nix

@@ -1,8 +0,0 @@
-with import <nixpkgs> {};
-
-runCommand "www" {
-  buildInputs = [
-    openssl
-    pkg-config
-  ];
-} ""