[Bug 1926732] Re: Add ubuntu-oci project for building OCI-ready tarballs with livecd-rootfs

[Thomas Bechtold]

groovy verification successful.

I changed the testing plan given that using the package from proposed
with ubuntu-old-fashioned is not that easy.

I did now use launchpad itself to build (see
https://code.launchpad.net/~toabctl/+livefs/ubuntu/groovy/proposed):

- hirsute ubuntu-oci build: https://launchpadlibrarian.net/538319776/buildlog_ubuntu_groovy_amd64_amd64-minimized-all_proposed_BUILDING.txt.gz
- hirsute ubuntu-base build: https://launchpadlibrarian.net/538330773/buildlog_ubuntu_groovy_amd64_amd64-minimized-all_proposed_BUILDING.txt.gz

Testing the docker container tarball:

$ cat << EOF > Dockerfile
FROM scratch
ADD groovy-minimal-cloudimg-amd64-root.tar.gz /
CMD ["/bin/bash"]
EOF
$ docker build .
Sending build context to Docker daemon  87.33MB
Step 1/3 : FROM scratch
 ---> 
Step 2/3 : ADD groovy-minimal-cloudimg-amd64-root.tar.gz /
 ---> e188f5d7b5cf
Step 3/3 : CMD ["/bin/bash"]
 ---> Running in 739610b46528
Removing intermediate container 739610b46528
 ---> 564bda04f793
Successfully built 564bda04f793
$ docker run -it 564bda04f793 uname -a
Linux a7ca765289f1 5.11.0-16-generic #17-Ubuntu SMP Wed Apr 14 20:12:43 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux


Size of groovy-minimal-cloudimg-amd64-root.tar.gz is 30441216 which is good.

** Tags removed: verification-needed-groovy
** Tags added: verification-done-groovy

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https://bugs.launchpad.net/bugs/1926732

Title:
  Add ubuntu-oci project for building OCI-ready tarballs with livecd-
  rootfs

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Fix Committed
Status in livecd-rootfs source package in Focal:
  Fix Committed
Status in livecd-rootfs source package in Groovy:
  Fix Committed
Status in livecd-rootfs source package in Hirsute:
  Fix Committed

Bug description:
  [Impact]

  Currently the ubuntu-base livecd-rootfs project is used to build tarballs that are the base for building docker/OCI images.
  The tarballs produced with the ubuntu-base project are modified externally (see https://github.com/tianon/docker-brew-ubuntu-core/blob/master/update.sh ) to create the "official" ubuntu images on dockerhub.

  When including the ubuntu-oci project into livecd-rootfs, we can build
  tarballs that already contain the changes that are currently done
  externally. This has multiple advantages:

  1) a Dockerfile using that tarball would no longer have to modify anything (means less layers)
  2) publishing new OCI images no longer depends on the external dockerhub image creation. Currently eg. the AWS ECR ubuntu containers depend on the containers from dockerhub. That would be no longer the case with this change
  3) Possible faster reaction on CVEs. no longer depending on external processes.

  [Test Plan]

  1) build ubuntu-oci project
  a) Build a test ubuntu-oci tarball with ubuntu-old-fashioned:

  ./scripts/ubuntu-bartender/ubuntu-bartender --no-cleanup --  --series
  impish --image-format plain --project ubuntu-oci --subproject
  minimized

  b) create a Dockerfile using the tarball created in step 1):

  cat << EOF > Dockerfile
  FROM scratch
  ADD ubuntu-impish-oci-cloudimg-amd64-root.tar.gz /
  CMD ["/bin/bash"]
  EOF

  c) build the container

  docker build .

  d) run something in the container:

  docker run -it $container-id uname -a

  e) check the size of the docker image and compare with the image for
  the same series available on dockerhub

  2) build another project (ubuntu-base minimized)
  a) Build a test ubuntu-base minimized project with ubuntu-old-fashioned to make sure the build does not break

  
  [Where problems could occur]

  This change could break other livecd-rootfs projects which might lead
  to failed builds. But beside that, there is nothing I can think of
  that would be affected by this change.

  [Other Info]

  When this is accepted, there will be livefs builds available at
  https://launchpad.net/~cloud-images-release-
  managers/+livefs/ubuntu/$SERIES/ubuntu-oci

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