nix: remove mozillaOverlay, use stable rust

default.nix

@@ -1,53 +1,22 @@
-{ mozillaOverlay ? import <mozillaOverlay>,
-  rustManifest ? ./channel-rust-nightly.toml,
+{ pkgs ? import <nixpkgs> {},
 }:
 
 let
-  pkgs = import <nixpkgs> { overlays = [ mozillaOverlay ]; };
-in
+  cargoSha256 = "11hvxh8drqpimax7b5z5r8qiwzy00j5r0xdshml0wgzxnmrnxzqc";
 
-with pkgs;
-
-let
-  rustChannelOfTargets = _channel: _date:
-    (pkgs.lib.rustLib.fromManifestFile rustManifest {
-      inherit (pkgs) stdenv fetchurl patchelf;
-    }).rust;
-  rust =
-    rustChannelOfTargets "nightly" null;
-  rustPlatform = pkgs.recurseIntoAttrs (pkgs.makeRustPlatform {
-    rustc = rust;
-    cargo = rust;
-  });
-
-  cargoSha256 = "0jbpwr84ncfj5nigznr06fpwaj89n839534n81hqwacflh1z43ix";
-
-  ticker-update = rustPlatform.buildRustPackage {
-    name = "ticker-update";
-    src = ./.;
-    buildInputs = [
-      pkg-config openssl postgresql.lib
-      rust
-    ];
-    preBuild = "pushd ticker-update";
-    postBuild = "popd";
-    inherit cargoSha256;
-  };
-
-  ticker-serve = rustPlatform.buildRustPackage {
-    name = "ticker-serve";
+  build = pname: pkgs.rustPlatform.buildRustPackage {
+    inherit pname;
+    version = "0.1.0";
     src = ./.;
-    buildInputs = [
-      pkg-config openssl postgresql.lib
-      rust
+    buildInputs = with pkgs; [
+      pkg-config openssl
+      postgresql.lib
     ];
-    preBuild = "pushd ticker-serve";
+    preBuild = "pushd ${pname}";
     postBuild = "popd";
     inherit cargoSha256;
   };
 in {
-  inherit
-    rustPlatform
-    ticker-update
-    ticker-serve;
+  ticker-update = build "ticker-update";
+  ticker-serve = build "ticker-serve";
 }

shell.nix

@@ -1,15 +1,15 @@
 { pkgs ? import <nixpkgs> {} }:
 
-with pkgs;
-
 let
-  default = import ./default.nix {};
+  default = import ./default.nix { inherit pkgs; };
 in
 
-stdenv.mkDerivation {
+pkgs.stdenv.mkDerivation {
   name = "env";
   buildInputs =
-    default.ticker-update.buildInputs;
+    [ pkgs.rustPlatform.rust.cargo ] ++
+    default.ticker-update.buildInputs ++
+    default.ticker-serve.buildInputs;
 
   shellHook = ''
     echo "Run 'cargo build --release'"