stm32: remove optional fetchcargo.nix

stm32/default.nix

@@ -8,31 +8,13 @@ let
   rustPlatform = pkgs.recurseIntoAttrs (pkgs.callPackage ./rustPlatform.nix {
     inherit rustManifest;
   });
-  fetchcargo = import ./fetchcargo.nix {
-    inherit (pkgs) stdenv cacert git cargo-vendor;
-    inherit (rustPlatform.rust) cargo;
-  };
   buildStm32Firmware = { name, src, cargoSha256 }:
-    let
-      firmwareDeps = fetchcargo { inherit name src; sha256 = cargoSha256; };
-    in
     rustPlatform.buildRustPackage rec {
       inherit name;
       version = "0.0.0";
 
       inherit src cargoSha256;
 
-        buildInputs = [ firmwareDeps ];
-        patchPhase = ''
-          cat >> .cargo/config <<EOF
-          [source.crates-io]
-          replace-with = "vendored-sources"
-
-          [source.vendored-sources]
-          directory = "${firmwareDeps}"
-          EOF
-        '';
-
       buildPhase = ''
         export CARGO_HOME=$(mktemp -d cargo-home.XXX)
         cargo build --release

stm32/fetchcargo.nix

@@ -1,49 +0,0 @@
-{ stdenv, cacert, git, cargo, cargo-vendor }:
-{ name, src, sha256 }:
-let
-  # `src` restricted to the two files that define dependencies
-  cargoOnlySrc = stdenv.mkDerivation {
-    name = "${name}-cargo";
-    inherit src;
-    phases = "installPhase";
-    installPhase = ''
-      mkdir $out
-      cp ${src}/Cargo.{toml,lock} $out/
-      mkdir $out/src
-      touch $out/src/main.rs
-    '';
-  };
-in
-stdenv.mkDerivation {
-  name = "${name}-vendor";
-  nativeBuildInputs = [ cacert git cargo cargo-vendor ];
-  src = cargoOnlySrc;
-
-  phases = "unpackPhase patchPhase installPhase";
-
-  installPhase = ''
-    if [[ ! -f Cargo.lock ]]; then
-        echo
-        echo "ERROR: The Cargo.lock file doesn't exist"
-        echo
-        echo "Cargo.lock is needed to make sure that cargoSha256 doesn't change"
-        echo "when the registry is updated."
-        echo
-
-        exit 1
-    fi
-
-    export CARGO_HOME=$(mktemp -d cargo-home.XXX)
-
-    cargo vendor
-
-    cp -ar vendor $out
-  '';
-
-  outputHashAlgo = "sha256";
-  outputHashMode = "recursive";
-  outputHash = sha256;
-
-  impureEnvVars = stdenv.lib.fetchers.proxyImpureEnvVars;
-  preferLocalBuild = true;
-}