Add zephyr dev shell

flake.nix

@@ -8,10 +8,16 @@
 
   outputs = { self, nixpkgs, utils }:
     utils.lib.eachDefaultSystem (system:
-      let pkgs = import nixpkgs { inherit system; };
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ (final: prev: self.packages."${system}") ];
+        };
       in {
         packages = { zephyr = pkgs.callPackage ./packages/zephyr { }; };
 
+        devShells = { zephyr = pkgs.callPackage ./shells/zephyr { }; };
+
         formatter = pkgs.nixfmt;
       });
 }

packages/zephyr/default.nix

@@ -1,6 +1,6 @@
 { callPackage, stdenv, lib }:
 let assets = lib.importJSON ./assets.json;
-in rec {
+in {
   host-tools = callPackage ./host-tools.nix {
     inherit (assets) version hosts;
     sources = assets.host_tools;
@@ -13,7 +13,6 @@ in rec {
     }) assets.toolchains;
 
   sdk = callPackage ./sdk.nix {
-    inherit host-tools;
     inherit (assets) version hosts;
     source = assets.sdk;
   };

packages/zephyr/sdk.nix

@@ -1,12 +1,12 @@
-{ lib, symlinkJoin, fetchurl, host-tools, source, version, hosts
+{ lib, symlinkJoin, fetchurl, zephyr, source, version, hosts, toolchains ? [ ]
-, toolchains ? [ ] }:
+}:
 let src = fetchurl source;
 in symlinkJoin rec {
   pname = "zephyr-sdk";
   inherit version;
   name = "${pname}-${version}";
 
-  paths = [ host-tools ] ++ toolchains;
+  paths = [ zephyr.host-tools ] ++ toolchains;
   postBuild = ''
     tar -C "$out" -xf "${src}" --exclude setup.sh --exclude sdk_toolchains --strip-components=1
   '';

shells/zephyr/default.nix

@@ -0,0 +1,24 @@
+{ mkShell, zephyr, cmake, ninja, gnumake, python3
+, toolchains ? with zephyr.toolchains; [ arm-zephyr-eabi ] }:
+let zephyr-sdk = zephyr.sdk.override { inherit toolchains; };
+in mkShell {
+  packages = [ cmake ninja gnumake python3 ] ++ (with python3.pkgs; [
+    # requirements-base.txt
+    pyelftools
+    pyyaml
+    pykwalify
+    canopen
+    packaging
+    progress
+    psutil
+    pylink-square
+    pyserial
+    requests
+    anytree
+    intelhex
+    west
+  ]);
+
+  ZEPHYR_TOOLCHAIN_VARIANT = "zephyr";
+  ZEPHYR_SDK_INSTALL_DIR = "${zephyr-sdk}";
+}