Docker Builder: Buildroot, Linux kernel, cross-compile

Docker image for (cross-)compiling stuff. Mainly used for Linux kernel and Buildroot images.

High-level workflow

Clone the repository:

git clone https://github.com/0xor0ne/docker-x-builder
cd docker-x-builder

Build the docker image with:

./scripts/docker_build.sh

The script also creates a new persistent volume called dxb-vol-<build_id>, where build_id is a random 8 characters values generated the first time docker_build.sh is called. The idea is that you can clone this repository multiple times and each build will be associated with a different persistent volume. However, as shown later it is possible to start the container with any custum created volume or without any volume at all.

For running the container interactively execute:

./scripts/docker_run_inter.sh

inside the container you can do all your "cross compilation work" (see the examples).

The first time the container is executed, the entrypoint script will copy the Buidroot repository in ${HOME}/workspace/buildroot. Note also that ${HOME}/workspace is the directory where the persistent volume is mounted. Moreover, ${HOME}/shared is a directory shared with the host. By default the root directory of docker-x-builder from the host is shared with the contaier.

It is possible to set a custom persistent volume or a custom shared directory (or both) by using the options --volume and --shared with the script ./scripts/docker_run_inter.sh.

For example, create a new volume with:

docker volume create --name myvolume

and then run:

./scripts/docker_run_inter.sh --volume myvolume --shared /tmp

With the previous command, the container will use the newly create volume myvolume and the host will share the directory /tmp

For deleting the image, the volume and the container, run:

./scripts/docker_remove_all.sh

NOTE: This does not remove the content of workspace directory:

Also, it is possible to only remove the volume (dxb-vol-<build_id>) with:

./scripts/docker_remove_volume.sh

The volume can be recreated with:

./scripts/docker_create_volume.sh

Examples

• Simple ARM (32 bits) Buildroot image

References

• BuildRoot manual