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JPHutchinsJPHutchins
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nix: try a workflow
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‎.github/workflows/nix.yaml‎

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name: Build with Nix
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on:
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push:
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pull_request:
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workflow_dispatch:
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permissions:
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contents: read
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jobs:
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build:
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name: Build with Nix (Ubuntu)
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v4
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with:
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path: smp-server-fixtures
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persist-credentials: false
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# Install Nix with flakes enabled
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- name: Install Nix
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uses: DeterminateSystems/nix-installer-action@main
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with:
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extra-conf: |
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experimental-features = nix-command flakes
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# Cache the Nix store for fast dependency restoration
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- name: Cache Nix store
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uses: DeterminateSystems/magic-nix-cache-action@main
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# Install system GCC for portable native_sim builds
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- name: Install system GCC multilib
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run: |
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sudo apt-get update
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sudo apt-get install -y gcc gcc-multilib g++-multilib
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# Cache the Zephyr SDK
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- name: Cache Zephyr SDK
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uses: actions/cache@v4
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with:
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path: ~/zephyr-sdk-0.17.4
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key: zephyr-sdk-0.17.4-${{ runner.os }}
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# Cache the workspace (zephyr, modules, bootloader)
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# Exclude the current repo to avoid caching build artifacts
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- name: Cache Zephyr workspace
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uses: actions/cache@v4
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with:
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path: |
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zephyr
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modules
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bootloader
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.west
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key: zephyr-workspace-${{ runner.os }}-${{ hashFiles('smp-server-fixtures/west.yml') }}
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restore-keys: |
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zephyr-workspace-${{ runner.os }}-
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# Cache Python virtual environment
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# Invalidates when west.yml changes (affects Python dependencies via west packages)
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- name: Cache Python venv
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uses: actions/cache@v4
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with:
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path: .venv
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key: python-venv-${{ runner.os }}-${{ hashFiles('smp-server-fixtures/west.yml') }}
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restore-keys: |
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python-venv-${{ runner.os }}-
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# Cache ccache for faster C/C++ compilation
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- name: Cache ccache
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uses: actions/cache@v4
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with:
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path: .ccache
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key: ccache-${{ runner.os }}-${{ github.sha }}
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restore-keys: |
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ccache-${{ runner.os }}-
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# Initialize west workspace if not cached
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# Note: west update will be run later by nix develop shell hook
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# This step just sets up the workspace structure
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- name: Initialize west workspace
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working-directory: smp-server-fixtures
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run: |
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if [ ! -d "../.west" ]; then
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echo "Initializing west workspace..."
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pip3 install west
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cd ..
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west init -l smp-server-fixtures
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else
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echo "West workspace already initialized (from cache)"
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fi
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# Enter Nix development environment and build
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- name: Build with Nix environment
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working-directory: smp-server-fixtures
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run: |
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nix develop --command bash -c '
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set -e
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# Show environment info
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echo "=== Environment Info ==="
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echo "GCC: $(which gcc) - $(gcc --version | head -1)"
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echo "Python: $(which python) - $(python --version)"
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echo "West: $(which west) - $(west --version)"
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echo "Ccache: $(ccache -s || echo "empty")"
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echo ""
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# Build native_sim serial fixture
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echo "=== Building native_sim serial fixture ==="
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west build -b native_sim apps/smp-server -T smp_server.fixture.serial.native_sim
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# Run Twister integration tests
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echo "=== Running Twister Integration Tests ==="
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west twister -T apps -v --inline-logs --integration --short-build-path -O /tmp/twister-out
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# Show ccache stats
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echo ""
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echo "=== Ccache Statistics ==="
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ccache -s
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'
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# Upload native_sim serial fixture
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- name: Upload native_sim serial fixture
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uses: actions/upload-artifact@v4
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with:
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name: smp-server-fixture-serial-${{ github.sha }}-native_sim-nix
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path: smp-server-fixtures/build/smp-server/zephyr/zephyr.exe
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# Upload twister artifacts
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- name: Upload twister artifacts
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uses: actions/upload-artifact@v4
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with:
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name: smp-server-fixtures-nix-${{ github.sha }}-ubuntu
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path: |
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/tmp/twister-out/**/*.hex
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/tmp/twister-out/**/*.bin
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/tmp/twister-out/**/*.exe
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/tmp/twister-out/**/*.elf
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/tmp/twister-out/**/*.map
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/tmp/twister-out/**/*.stat
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/tmp/twister-out/**/zephyr.dts
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/tmp/twister-out/**/build.log
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/tmp/twister-out/twister.log

‎flake.lock‎

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‎flake.nix‎

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{
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description = "Zephyr RTOS development environment for smp-server-fixtures";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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flake-utils.url = "github:numtide/flake-utils";
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};
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outputs =
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{
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self,
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nixpkgs,
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flake-utils,
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}:
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flake-utils.lib.eachDefaultSystem (
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system:
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let
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pkgs = import nixpkgs {
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inherit system;
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};
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# These packages match the apt requirements:
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# git cmake ninja-build gperf ccache dfu-util device-tree-compiler wget
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# python3-dev python3-venv python3-tk xz-utils file make gcc gcc-multilib
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# g++-multilib libsdl2-dev libmagic1
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buildInputs =
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with pkgs;
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[
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git
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cmake
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ninja
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gperf
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ccache
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gnumake
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file
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wget
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xz
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dtc
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# NOTE: We intentionally do NOT include gcc/stdenv.cc from Nix
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# For native_sim builds, we need to use the system's GCC to produce
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# portable binaries that can run on standard Ubuntu systems
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uv
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pkg-config
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nixfmt-rfc-style
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]
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++ pkgs.lib.optionals pkgs.stdenv.isLinux [
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];
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# Shell hook that sets up the environment
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shellHook = ''
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set -e # Exit on any error
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echo "🚀 Entering Zephyr development environment"
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# Prepend system paths to ensure system GCC is found first
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# This is critical for portable native_sim builds
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export PATH="/usr/bin:/usr/local/bin:$PATH"
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# Check for system GCC (required for portable native_sim builds)
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if ! command -v gcc &> /dev/null; then
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echo "❌ Error: System GCC not found in PATH"
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echo " For portable native_sim builds, you need system GCC installed."
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echo " Install with: sudo apt install gcc gcc-multilib g++-multilib"
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exit 1
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fi
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SYSTEM_GCC=$(which gcc)
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if [[ "$SYSTEM_GCC" == *"/nix/store"* ]]; then
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echo "❌ Error: GCC is still pointing to Nix store: $SYSTEM_GCC"
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echo " System GCC should be in /usr/bin, not Nix store"
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exit 1
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fi
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echo "✓ Using system GCC: $SYSTEM_GCC ($(gcc --version | head -1))"
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# Ensure we're in a west workspace
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if [ ! -d "../.west" ]; then
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echo "❌ Error: Not in a west workspace root. Directory ../.west not found."
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echo " Please run 'west init' first or ensure you're in the correct directory."
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exit 1
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fi
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# Set up ccache
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export CCACHE_DIR="../.ccache"
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export CCACHE_MAXSIZE="2G"
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export USE_CCACHE=1
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mkdir -p "$CCACHE_DIR" || { echo "❌ Failed to create ccache directory"; exit 1; }
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# Set up Python virtual environment with uv
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if [ ! -d "../.venv" ]; then
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echo "📦 Creating Python 3.13 virtual environment with uv..."
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cd .. || exit 1
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uv venv --python 3.13 --seed || { echo "❌ Failed to create venv"; exit 1; }
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cd - > /dev/null || exit 1
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fi
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# Activate the virtual environment
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if [ -f "../.venv/bin/activate" ]; then
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source ../.venv/bin/activate || { echo "❌ Failed to activate venv"; exit 1; }
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else
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echo "❌ Error: Virtual environment not found at ../.venv"
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exit 1
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fi
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echo "📦 Installing west..."
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pip install west || { echo "❌ Failed to install west"; exit 1; }
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# Run west update to sync dependencies
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echo "🔄 Running west update..."
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west update || { echo "❌ west update failed"; exit 1; }
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echo "📦 Installing Python dependencies via west..."
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west zephyr-export || { echo "❌ west zephyr-export failed"; exit 1; }
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west packages pip --install || { echo "❌ west packages pip --install failed"; exit 1; }
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echo "🔧 Installing Zephyr SDK (arm-zephyr-eabi toolchain)..."
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west sdk install -t arm-zephyr-eabi || { echo "❌ Zephyr SDK installation failed"; exit 1; }
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# Set Zephyr environment variables with absolute paths
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export ZEPHYR_BASE="$(realpath ../zephyr)"
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echo "✓ ZEPHYR_BASE set to: $ZEPHYR_BASE"
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set +e # Restore normal error handling for interactive shell
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'';
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in
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{
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devShells.default = pkgs.mkShell {
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inherit buildInputs shellHook;
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# Environment variables are set in shellHook to use absolute paths
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};
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}
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);
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}

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