From 836e6d3e021b56c84de76ff32f751ca4ea994079 Mon Sep 17 00:00:00 2001
From: figsoda <figsoda@pm.me>
Date: Tue, 19 Oct 2021 19:59:28 -0400
Subject: [PATCH 1/2] buildRustPackage: remove unused arguments, minor styling
 changes

---
 pkgs/build-support/rust/default.nix | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/pkgs/build-support/rust/default.nix b/pkgs/build-support/rust/default.nix
index 2eb45bcafa13..840abb2d918a 100644
--- a/pkgs/build-support/rust/default.nix
+++ b/pkgs/build-support/rust/default.nix
@@ -1,17 +1,15 @@
-{ stdenv
-, lib
-, buildPackages
+{ lib
+, importCargoLock
+, fetchCargoTarball
+, rust
+, stdenv
+, callPackage
 , cacert
+, git
 , cargoBuildHook
 , cargoCheckHook
 , cargoInstallHook
 , cargoSetupHook
-, fetchCargoTarball
-, importCargoLock
-, rustPlatform
-, callPackage
-, git
-, rust
 , rustc
 , libiconv
 , windows
@@ -88,7 +86,7 @@ let
       (lib.removeSuffix ".json" (builtins.baseNameOf "${target}"))
     else target;
 
-  sysroot = (callPackage ./sysroot {}) {
+  sysroot = callPackage ./sysroot { } {
     inherit target shortTarget;
     RUSTFLAGS = args.RUSTFLAGS or "";
     originalCargoToml = src + /Cargo.toml; # profile info is later extracted

From f441e6b7f4574c85eb190b52390bbe61f355b514 Mon Sep 17 00:00:00 2001
From: figsoda <figsoda@pm.me>
Date: Mon, 18 Oct 2021 19:21:43 -0400
Subject: [PATCH 2/2] buildRustPackage,fetchCargoTarball: accept empty hashes

---
 pkgs/build-support/rust/default.nix           | 16 ++++++----------
 pkgs/build-support/rust/fetchCargoTarball.nix |  6 ++----
 2 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/pkgs/build-support/rust/default.nix b/pkgs/build-support/rust/default.nix
index 840abb2d918a..3d7057dd7d97 100644
--- a/pkgs/build-support/rust/default.nix
+++ b/pkgs/build-support/rust/default.nix
@@ -17,12 +17,6 @@
 
 { name ? "${args.pname}-${args.version}"
 
-  # SRI hash
-, cargoHash ? ""
-
-  # Legacy hash
-, cargoSha256 ? ""
-
   # Name for the vendored dependencies tarball
 , cargoDepsName ? name
 
@@ -54,7 +48,7 @@
 , buildAndTestSubdir ? null
 , ... } @ args:
 
-assert cargoVendorDir == null && cargoLock == null -> cargoSha256 == "" && cargoHash == ""
+assert cargoVendorDir == null && cargoLock == null -> !(args ? cargoSha256) && !(args ? cargoHash)
   -> throw "cargoSha256, cargoHash, cargoVendorDir, or cargoLock must be set";
 assert buildType == "release" || buildType == "debug";
 
@@ -66,15 +60,17 @@ let
     else fetchCargoTarball ({
       inherit src srcs sourceRoot unpackPhase cargoUpdateHook;
       name = cargoDepsName;
-      hash = cargoHash;
       patches = cargoPatches;
-      sha256 = cargoSha256;
+    } // lib.optionalAttrs (args ? cargoHash) {
+      hash = args.cargoHash;
+    } // lib.optionalAttrs (args ? cargoSha256) {
+      sha256 = args.cargoSha256;
     } // depsExtraArgs)
     else null;
 
   # If we have a cargoSha256 fixed-output derivation, validate it at build time
   # against the src fixed-output derivation to check consistency.
-  validateCargoDeps = !(cargoHash == "" && cargoSha256 == "");
+  validateCargoDeps = args ? cargoHash || args ? cargoSha256;
 
   target = rust.toRustTargetSpec stdenv.hostPlatform;
   targetIsJSON = lib.hasSuffix ".json" target;
diff --git a/pkgs/build-support/rust/fetchCargoTarball.nix b/pkgs/build-support/rust/fetchCargoTarball.nix
index 2e8830b47574..c2be9aac82df 100644
--- a/pkgs/build-support/rust/fetchCargoTarball.nix
+++ b/pkgs/build-support/rust/fetchCargoTarball.nix
@@ -22,15 +22,13 @@ in
 , srcs ? []
 , patches ? []
 , sourceRoot ? ""
-, hash ? ""
-, sha256 ? ""
 , cargoUpdateHook ? ""
 , ...
 } @ args:
 
 let hash_ =
-  if hash != "" then { outputHashAlgo = null; outputHash = hash; }
-  else if sha256 != "" then { outputHashAlgo = "sha256"; outputHash = sha256; }
+  if args ? hash then { outputHashAlgo = null; outputHash = args.hash; }
+  else if args ? sha256 then { outputHashAlgo = "sha256"; outputHash = args.sha256; }
   else throw "fetchCargoTarball requires a hash for ${name}";
 in stdenv.mkDerivation ({
   name = "${name}-vendor.tar.gz";