parameterize the rustManifest file

default.nix

@@ -1,18 +1,13 @@
 { # Use master branch of the overlay by default
   mozillaOverlay ? import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz),
-  # This is needed when nix-build is run with option
-  # `restrict-eval`. Setting this flag to `true` causes the
-  # rustPlatform to be generated from the bundled
-  # `channel-rust-nightly.toml`. By default (`false`) the
-  # mozillaOverlay fetches the latest manifest.
-  rustRestrictedManifest ? false,
   pkgs ? import <nixpkgs> { overlays = [ mozillaOverlay ]; },
+  rustManifest ? builtins.fetchurl "https://static.rust-lang.org/dist/channel-rust-nightly.toml"
 }:
 
 with pkgs;
 let
   rustPlatform = recurseIntoAttrs (callPackage (import ./nix/rustPlatform.nix) {
-    restrictedManifest = rustRestrictedManifest;
+    inherit rustManifest;
   });
   adc2tcp = callPackage (import ./nix/adc2tcp.nix) { inherit rustPlatform; };
   openocd = callPackage (import ./nix/openocd.nix) {};

nix/rustPlatform.nix

@@ -1,7 +1,7 @@
 { recurseIntoAttrs, stdenv, lib,
   makeRustPlatform, rustChannelOfTargets,
   fetchurl, patchelf,
-  restrictedManifest ? false
+  rustManifest ? ./channel-rust-nightly.toml
 }:
 
 let
@@ -13,7 +13,7 @@ let
     "thumbv7em-none-eabihf"
   ];
   rustChannel =
-    lib.rustLib.fromManifestFile ./channel-rust-nightly.toml {
+    lib.rustLib.fromManifestFile rustManifest {
       inherit stdenv fetchurl patchelf;
     };
   rust =

release.nix

@@ -1,8 +1,13 @@
 # For running on Hydra
-{ pkgs ? import <nixpkgs> {}}:
+{ pkgs ? import <nixpkgs> {},
+  rustManifest ? ./nix/channel-rust-nightly.toml
+}:
 
 {
+channel = pkgs.releaseTools.channel {
+  name = "adc2tcp";
   adc2tcp = pkgs.lib.hydraJob (import ./default.nix {
+    inherit rustManifest;
     mozillaOverlay = import <mozillaOverlay>;
     rustRestrictedManifest = true;
   });