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docker_images

README.md

Docker image creation and usage

The Docker images which can be created using the content provided are used to build third-party libraries and create framework releases across architectures for Linux. The images rely on QEMU for emulation and as a result receive a considerable performance overhead. For third-party libraries this is arguably outweighed by the convenience provided.

Document conventions

Commands starting with a # should be run as superuser / root

Prerequisites

These processes were developed on a Debian-based Linux distro and were executed as a regular user. In theory the processes described within could be run on other OSes and distros, but the instructions below focus on Linux.

Install

First you need Docker and QEMU

$ apt install docker.io qemu-user-static

Configure User Mode

Add yourself to the Docker group, this ensures that when the docker daemon starts it creates a socket accessible by all members in the docker group, instead of only root.

$ sudo groupadd docker
$ sudo usermod -aG docker $USER       
$ newgrp docker

Verify that you can run docker commands without sudo:

$ docker run hello-world

Build X

Follow the instructions on the Docker Buildx page to get Buildx installed, running eg. $ docker buildx version to verify its installation.

At time of writing, installing buildx (0.8.2) requires the following steps:

$ wget https://github.com/docker/buildx/releases/download/v0.8.2/buildx-v0.8.2.linux-amd64
$ mkdir -p ~/.docker/cli-plugins
$ mv buildx-v0.8.2.linux-amd64 ~/.docker/cli-plugins/docker-buildx
$ chmod +x ~/.docker/cli-plugins/docker-buildx
$ docker buildx install
$ docker buildx version

The final line of the output should show the installed Docker Buildx version, eg:

github.com/docker/buildx v0.8.2 266c0eac611d64fcc0c72d80206aa364e826758d

Creating an image

Before using a Docker-driven process an image needs to be created for the target architecture you're compiling for. This is the case even if you're using a Docker Buildx process targeting your native architecture.

The wrapper script create_image.py exists to guide the image creation process, including bringing in CMake from thirdparty. Provide the architecture identifier to that script to build an image.

eg. for ARMhf

$ ./create_image.py armhf

Check the Docker image list to verify it's been created

$ docker images ls

Compiling a third-party library

At this point you're ready to use the created image to build a library from thirdparty.

eg. to build Assimp for ARMhf change into that directory then run the following

$ rm -rf linux/armhf
$ docker buildx bake armhf

The build output will (for ARMhf) be deployed into linux/armhf. You may want to then change ownership to the normal user.

Useful options when running Buildx's bake include:

  • Invalidate the cache: --no-cache
  • Get plain log output: --progress plain

Packaging the framework

Follow the instructions within build_tools/cross_arch_linux_packaging for a work-in-progress process to build for another Linux architecture using emulation.

Modifying the Dockerfile

Edit the DockerFile in the root of the third-party library to make changes to the instructions executed for the build. In most cases where there are no NAP-specific (downstream) changes to the library a new version of the library can be deployed by bumping the version in the Dockerfile and running the Buildx bake command (above).

Cleaning up

The following can be run to recover disk space

$ docker system prune -f

More aggressively, to remove all images, containers, layers, etc:

$ docker system prune -fa

To delete a single image

$ docker image rm <image_name>

eg.

$ docker image rm nap-armhf-raspbian_buster