Add zephyr host tools

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.nix]
+indent_style = space
+indent_size = 2

.gitignore

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+result
+result-*

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1699343069,
+        "narHash": "sha256-s7BBhyLA6MI6FuJgs4F/SgpntHBzz40/qV0xLPW6A1Q=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "ec750fd01963ab6b20ee1f0cb488754e8036d89d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "artemist's NixOS packages and shells for development";
+  
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils }: utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      packages = {
+        zephyr = pkgs.callPackage ./packages/zephyr { };
+      };
+
+      formatter = pkgs.nixfmt;
+    });
+  }
+

packages/zephyr/default.nix

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+{ callPackage, stdenv, lib }:
+let assets = lib.importJSON ./assets.json;
+in {
+  host-tools = callPackage ./host-tools.nix {
+    inherit (assets) version hosts;
+    sources = assets.host_tools;
+  };
+}

packages/zephyr/host-tools.nix

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+{ stdenv, fetchurl, hosts, lib, python3, sources, version, which }:
+stdenv.mkDerivation rec {
+  pname = "zephyr-host-tools";
+  inherit version;
+
+  nativeBuildInputs = [ python3 which ];
+  src = fetchurl (sources."${stdenv.hostPlatform.system}");
+
+  dontUnpack = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    # Extract outer archive (no directories so nixpkgs can't unpack)
+    tar xvf ${src}
+    cp *.sh $TEMP/installer.sh
+    chmod +x $TEMP/installer.sh
+    $TEMP/installer.sh -D -n -y -d "$out"
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    homepage = "https://www.zephyrproject.org/";
+    description = "Host tools for building the Zephyr RTOS";
+    license = licenses.asl20;
+    platforms = hosts;
+    maintainers = with maintainers; [ artemist ];
+  };
+}

packages/zephyr/update.py

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+#!/usr/bin/env nix-shell
+#! nix-shell -i python3 -p python3 python3Packages.requests
+import requests
+import json
+import subprocess
+import os
+import re
+
+
+def prefetch_file(url: str) -> str:
+    out = subprocess.run(
+        ["nix", "store", "prefetch-file", "--json", url],
+        stdout=subprocess.PIPE,
+        check=True,
+    )
+    return json.loads(out.stdout.decode("utf-8"))["hash"]
+
+
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+HOSTS = ["aarch64", "x86_64"]
+
+release = requests.get(
+    "https://api.github.com/repos/zephyrproject-rtos/sdk-ng/releases/latest"
+).json()
+tag = release["tag_name"]
+targets = []
+for asset in release["assets"]:
+    if (
+        match := re.fullmatch(
+            r"toolchain_linux-aarch64_([a-zA-Z0-9_-]+)\.tar\.xz", asset["name"]
+        )
+    ) is not None:
+        targets.append(match.group(1))
+
+host_tools = {}
+for host in HOSTS:
+    url = f"https://github.com/zephyrproject-rtos/sdk-ng/releases/download/{tag}/hosttools_linux-{host}.tar.xz"
+    host_tools[host + "-linux"] = {"url": url, "hash": prefetch_file(url)}
+
+toolchains = {}
+for target in targets:
+    toolchains[target] = {}
+    for host in HOSTS:
+        url = f"https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.3/toolchain_linux-{host}_{target}.tar.xz"
+        toolchains[target][host + "-linux"] = {"url": url, "hash": prefetch_file(url)}
+
+out_obj = {
+    "version": tag[1:],
+    "hosts": list(map(lambda arch: arch + "-linux", HOSTS)),
+    "host_tools": host_tools,
+    "toolchains": toolchains,
+}
+
+with open(os.path.join(BASE_DIR, "assets.json"), "w") as out_file:
+    json.dump(out_obj, out_file)