Zephyr CircleCI Example (out of tree application)

config.yml

version: 2.0
jobs:
  build:
    docker:
      - image: teslabs/CUSTOM_IMAGE_NAME:latest
    steps:
      - checkout

      - restore_cache:
          key: west-{{ checksum "west.yml" }}

      - run:
          name: initialize
          command: |
            west init -l .
            cd ..
            west update

      - save_cache:
          key: west-{{ checksum "west.yml" }}
          paths:
            - "~/zephyr"
            - "~/modules"

      - restore_cache:
          key: pip-{{ checksum "../zephyr/scripts/requirements.txt" }}

      - run:
          name: install Zephyr dependencies
          command: pip3 install -r ../zephyr/scripts/requirements.txt

      - save_cache:
          key: pip-{{ checksum "../zephyr/scripts/requirements.txt" }}
          paths:
            - "~/.cache/pip"

      - run:
          name: build
          command: |
            source env.sh
            west build

      - store_artifacts:
          path: build/zephyr/zephyr.elf

Dockerfile

FROM ubuntu:20.04

ARG DEBIAN_FRONTEND=noninteractive

# install dependencies
RUN apt-get update && apt-get install -y \
    # CircleCI
    software-properties-common \
    wget \
    git \
    openssh-client \
    ca-certificates \
    sudo \
    # Zephyr
    cmake \
    ninja-build \
    python3 \
    python3-pip \
    device-tree-compiler \
    gperf \
 && rm -rf /var/lib/apt/lists/*

# install ARM Embedded GCC Toolchain
RUN wget -q https://developer.arm.com/-/media/Files/downloads/gnu-rm/9-2019q4/RC2.1/gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2 && \
    mkdir /tools && \
    tar -jxf gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2 -C /tools && \
    rm gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2

ENV PATH "/tools/gcc-arm-none-eabi-9-2019-q4-major/bin:$PATH"

# install West
RUN pip3 install west

env.sh

#!/bin/sh

export ZEPHYR_TOOLCHAIN_VARIANT="gnuarmemb"
export GNUARMEMB_TOOLCHAIN_PATH="$(dirname "$(which arm-none-eabi-gcc)")/.."

source ../zephyr/zephyr-env.sh