Docker image with environment suitable for building balena OS

README.md

Building with yocto inside of a docker container

• Build the image described in Dockerfile here:

docker build -t build-yocto .

• Create a volume that will store build data.

docker create volume yoctovolume

• Make enter-yocto available in you PATH, and run

enter-yocto

• Now you inside of docker container, current directory is /balena-yocto-build. Clone your repo and start building, and /balena-yocto-build content will be stored acrosss multiple container runs.

Please note that if you change image and volume names, you have to modify enter-yocto script too.

On MacOS, you may need to adjust Docker settings to give it access to more CPU, memory, and disk.

Dockerfile

FROM gmacario/build-yocto

# Install extra tools for balena build.
RUN sudo apt-get update && sudo apt-get -y install \
    nodejs \
    npm \
    jq \
    iptables

# Install docker.
RUN sudo apt-get -y install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common
RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
RUN sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
RUN sudo apt-get update && sudo apt-get -y install docker-ce-cli

RUN sudo groupadd docker && sudo usermod -a -G docker build

COPY entry.sh /entry.sh
ENTRYPOINT [ "/bin/bash", "/entry.sh" ]

enter-yocto

#!/usr/bin/env bash

VOLUME_NAME=yoctovolume
if ! [[ -z $1 ]]; then
  VOLUME_NAME=$1
fi
docker inspect $VOLUME_NAME > /dev/null 2>/dev/null || (echo "Volume $VOLUME_NAME is not found!" && exit 1)
echo "Using $VOLUME_NAME volume..."

DOCKER_SOCKET_PATH=/var/run/docker.sock

WORKDIR_SLUG="balena-yocto-build"

CONTAINER_WORKDIR=/${WORKDIR_SLUG}

docker run -it --rm \
	-v ${VOLUME_NAME}:${CONTAINER_WORKDIR} \
	-w=${CONTAINER_WORKDIR} \
	-v ${DOCKER_SOCKET_PATH}:${DOCKER_SOCKET_PATH} \
	-e "BUILD_DOCKER_SHARED_VOLUME=${VOLUME_NAME}" \
	-e "BUILD_DOCKER_SHARED_VOLUME_MOUNT_PATH=${CONTAINER_WORKDIR}" \
	-e "BB_ENV_EXTRAWHITE=BUILD_DOCKER_SHARED_VOLUME BUILD_DOCKER_SHARED_VOLUME_MOUNT_PATH" \
	build-yocto

entry.sh

sudo chown root:docker /var/run/docker.sock

/bin/bash