Container Support

Problem statement¶

1. There is no way to free some disc space because we do not allow repo versions removal from push repos. Deleting entire repo is not a viable option.
2. There is no way to delete certain repo versions if there is no longer need to keep them.

(Note: Orphan clean up is still expected to be run in order to remove artifacts from the fs.)

Solution¶

1. Enable DELETE on the push repo versions endpoint and allow removal of any versions except the latest one.
   • might bring complexity in the logic. Add validation on the distribution update call to disallow repo_version update
   • change in access policy
2. After each push operation remove all repo versions except the latest one. As a result each push operation will always result into one version.
   • this approach will close forever the door for us for adding 'rollback' capabilities for push repos
   • this behaviour might be considered as unwanted/confusing. Other operations like tag/untag/manifest removal will still produce a new version and will not clean up previous ones ( behaviour discrepancy)
3. Leave this to pulpcore which will introduce retain N repo-version option. For pulp container push repos by default there will retained only 1 version https://pulp.plan.io/issues/8368