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This PR is part of the work required for fixing https://bugs.launchpad.net/juju/+bug/1812227. Juju needs to retrieve the VCS version (e.g git sha) for charm archives fetched from the charmstore.
In order to avoid changing the
Charm
interface that would inevitably break other dependencies, the PR exposes aVersion()
method on theCharmArchive
type. The actual juju code that fetches the archive (using the charmrepo pkg) already casts the result to acharm.CharmArchive
so this change allows us to fetch the version with minimal impact to other users of the package.