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otto

OCI images to ostree commits

About

This is a small proof of concept that demonstrates updating of OSTree repository via a commit that is transported via an OCI Image Archive.

The OSTree commit for a specific repository and branch is transported via a OSTree repository that is inside an OCI Image Archive. This project, otto, provides a web server that serves an OSTree repository via HTTP at /ostree/repo but also implements a minimal container registry that can be used to push container images to via the docker registry API v2. When the image manifest is being pushed, in the last step of uploading a new OCI Image Archive, the annotations are checked and they must contain the following key and value pairs:

  • org.osbuild.ostree.repo: location of the OSTree repo inside the image archive.
  • org.osbuild.ostree.ref: OSTree reference of the commit that should be imported and branch it should be imported to
  • org.osbuild.ostree.layer: identifer (index or digest) of the layer that contains the OSTree repo If those are not provided, the image push will not be accepted.

On a successful push of a new OSTree Image Archive with a contained commit, the layer is then unpacked, and pulled into the OSTree repo. Additionally the OSTree summary is updated.

Getting started

A Dockerfile and a simple Makefile to generate the image, start and stop the container is included:

make build  # build otto, also generates TLS certificates
make start  # start the container, mounts $pwd at /source
make stop   # stop the container

The skopeo binary is installed in the container so that it is easy to test pushing an existing container:

docker exec -it otto /bin/bash
cd /source
skopeo copy oci-archive:container.tar docker://localhost:3000/test