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Story #3209

Updated by dkliban@redhat.com almost 3 years ago

h2. Motivation

The ContentUnits added to a repository change over time, but Pulp only stores the current state. This prevents a lot of great things like rolling back to a particluar snapshot, or understanding exactly what content is in place at any given time.

h2. Solution

Introducing the Repository Version, which represents the ContentUnits in a repository after any given operation. For example, each of the following operations will produce a repository version.

* Sync from an importer
* Add a set of units to a repository
* Remove a set of units from a repository

Any repository version can be deleted. Publications are changed to publish a specific RepositoryVersion, not just the latest content in a given repo.

h2. API examples

<pre>
POST /api/v3/repositories/{repo_id}/versions/ # create the new RepositoryVersion. specify the importer here, and/or units to add, and/or units to remove
GET /api/v3/repository/{repo_id}/versions/{number} # The resource for a single repo version
GET /api/v3/repositories/{repo_id}/versions/<id>/content/ # paginated list of all content in particular version
GET /api/v3/repositories/{repo_id}/versions/<id>/added_content/ # paginated list of content added when a particular version was created
GET /api/v3/repositories/{repo_id}/versions/<id>/removed_content/ # paginated list of content removed when a particular version was created
</pre>

h2. Technical details

The _RepositoryVersion_ table stores all repository versions for all repositories. A repository version is a set of content.

*RepositoryVersion*
* [pk] *id* - The primary key.
* [fk] *content* - The associated repository.
* *created* - When the repository version was created.
* *number* - A positive integer that uniquely identifies a version of a specific repository. Each new version for a repository should have this field set to 1 + the most recent version.

The _RepositoryContent_ table stores association between a repository version and its contained content.

content

*RepositoryContent*
* [pk] *id* - The primary key.
* [fk] *content* - The associated content.
* [fk] *repository* - The associated repository.
* [fk] *version_added* - The RepositoryVersion which added the referenced Content.
* [fk] *version_removed* - The RepositoryVersion which removed the referenced Content.

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