Use Rust binaries from Nix instead of rustup

default.nix

@@ -11,26 +11,17 @@ with import ./nix/common.nix;
 let
   crossSystem = { config = target; };
 in let
-
   pkgs = import pkgsSrc {
     inherit system crossSystem;
-    overlays = [ cargo2nixOverlay rustOverlay ];
+    overlays = [ cargo2nixOverlay ];
   };
-  rustDist = pkgs.buildPackages.rust-bin.stable.latest.default;
 
   /*
    The following complexity should be abstracted by makePackageSet' (note the final quote).
    However its code uses deprecated features of rust-overlay that can lead to bug.
    Instead, we build our own rustChannel object with the recommended API of rust-overlay.
    */
-  rustChannel = rustDist // {
+  rustChannel = pkgs.rustPlatform.rust;
-    cargo = rustDist;
-    rustc = rustDist.override {
-      targets = [
-        (pkgs.rustBuilder.rustLib.realHostTriple pkgs.stdenv.targetPlatform)
-      ];
-    };
-  };
 
   overrides = pkgs.buildPackages.rustBuilder.overrides.all ++ [
     (pkgs.rustBuilder.rustLib.makeOverride {

nix/common.nix

@@ -12,16 +12,10 @@ rec {
     url = "https://github.com/superboum/cargo2nix";
     rev = "1364752cd784764db2ef5b1e1248727cebfae2ce";
   };
-  rustOverlaySrc = fetchGit {
-    # As of 2021-10-05
-    url = "https://github.com/oxalica/rust-overlay";
-    rev = "9c2fc6a62ccbc6f420d71ecac6bf0b84dbbee64f";
-  };
 
   /*
    * Shared objects
    */
-  rustOverlay = import rustOverlaySrc;
   cargo2nix = import cargo2nixSrc;
   cargo2nixOverlay = import "${cargo2nixSrc}/overlay";
 }

shell.nix

@@ -1,6 +1,5 @@
 {
   system ? builtins.currentSystem,
-  crossSystem ? null,
   rust ? true,
   integration ? true,
   release ? true,
@@ -10,10 +9,9 @@ with import ./nix/common.nix;
 
 let
   pkgs = import pkgsSrc {
-    inherit system crossSystem;
+    inherit system;
-    overlays = [ cargo2nixOverlay rustOverlay ];
+    overlays = [ cargo2nixOverlay ];
   };
-  rustDist = pkgs.buildPackages.rust-bin.stable.latest.default;
   kaniko = (import ./nix/kaniko.nix) pkgs;
 
 in
@@ -60,7 +58,13 @@ function refresh_index {
   '';
 
   nativeBuildInputs = 
-   (if rust then [ rustDist (pkgs.callPackage cargo2nix {}).package ] else [])
+   (if rust then [
+     pkgs.rustPlatform.rust.rustc
+     pkgs.rustPlatform.rust.cargo
+     pkgs.clippy
+     pkgs.rustfmt
+     /*(pkgs.callPackage cargo2nix {}).package*/
+    ] else [])
    ++
    (if integration then [ pkgs.s3cmd pkgs.awscli2 pkgs.minio-client pkgs.rclone pkgs.socat pkgs.psmisc pkgs.which ] else [])
    ++