brickstrap
Brickstrap is a tool for turning Docker images into bootable image files for embedded systems.
About
The name "brickstrap" comes from the fact that it was developed to bootstrap the LEGO MINDSTORMS EV3 Intelligent Brick as part of the ev3dev project. Nevertheless, it works well for other embedded systems too. We have Raspberry Pi and BeagleBone configurations as well.
Installation
Since brickstrap is essentially just a bash script, you can run directly from
the source code.
git clone git://github.com/ev3dev/brickstrap
brickstrap/src/brickstrap.sh create-tar my-docker-image my.tar
There is also a Debian package available for Ubuntu trusty in the ev3dev package repository.
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 2B210565
sudo apt-add-repository "deb http://archive.ev3dev.org/ubuntu trusty main"
sudo apt-get update
sudo apt-get install brickstrap
If you just want to run from git, make sure you have these packages installed.
They will be installed automatically if you use the brickstrap package, so you
can skip this if that is the case. You only need qemu-user-static if the
Docker image is for a foreign architecture.
sudo apt-get install docker-engine libguestfs-tools qemu-user-static
If you have never used libguestfs before, you need to set it up. Note:
update-guestfs-appliance may not exist in newer versions of guestfs. If get
an error for that command, ignore it and move on.
# create a supermin appliance
sudo update-guestfs-appliance
# add yourself to the kvm group
sudo usermod -a -G kvm $USER
newgrp kvm # or log out and log back in
# fix permissions on /boot/vmlinuz*
sudo chmod +r /boot/vmlinuz*
Usage
See the man page or if you installed the Debian package, run man brickstrap.