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debos - Debian OS images builder

Sypnosis

debos [options] <recipe file in YAML>
debos [--help]

Application Options:

      --artifactdir=
  -t, --template-var=   Template variables
      --debug-shell     Fall into interactive shell on error
  -s, --shell=          Redefine interactive shell binary (default: bash)
      --scratchsize=    Size of disk backed scratch space

Description

debos is a tool to make the creation of various Debian-based OS images simpler. While most other tools focus on specific use-cases, debos is more meant as a tool-chain to make common actions trivial while providing enough rope to do whatever tweaking that might be required behind the scene.

debos expects a YAML file as input and will run the actions listed in the file sequentially. These actions should be self-contained and independent of each other.

Some of the actions provided by debos to customize and produce images are:

  • apt: install packages and their dependencies with 'apt'
  • debootstrap: construct the target rootfs with debootstrap
  • download: download a single file from the internet
  • filesystem-deploy: deploy a root filesystem to an image previously created
  • image-partition: create an image file, make partitions and format them
  • ostree-commit: create an OSTree commit from rootfs
  • ostree-deploy: deploy an OSTree branch to the image
  • overlay: do a recursive copy of directories or files to the target filesystem
  • pack: create a tarball with the target filesystem
  • raw: directly write a file to the output image at a given offset
  • run: allows to run a command or script in the filesystem or in the host
  • unpack: unpack files from archive in the filesystem

A full syntax description of all the debos actions can be found at: https://godoc.org/github.com/go-debos/debos/actions

Simple example

The following example will create a arm64 image, install several packages in it, change the file /etc/hostname to "debian" and finally make a tarball.

{{- $image := or .image "debian.tgz" -}}

architecture: arm64

actions:
  - action: debootstrap
    suite: "buster"
    components:
      - main
      - non-free
    mirror: https://deb.debian.org/debian
    variant: minbase

  - action: apt
    packages: [ sudo, openssh-server, adduser, systemd-sysv, firmware-linux ]

  - action: run
    chroot: true
    command: echo debian > /etc/hostname

  - action: pack
    file: {{ $image }}
    compression: gz

To run it, create a file named example.yaml and run:

debos example.yaml

The final tarball will be named "debian.tgz" if you would like to modify this name, you can provided a different name for the variable image like this:

debos -t image:"debian-arm64.tgz" example.yaml

Other examples

This example builds a customized image for a Raspberry Pi 3. https://github.com/go-debos/debos-recipes

See also

fakemachine at https://github.com/go-debos/fakemachine