Comment 20 for bug 1964815

How charmstore is managed is not related to the issue. There's nothing to rollback that has anything related to the issue.

The issue here has been there from day one and is related to a change in the charm data model. Things worked before because centos charms had been published to the old store with channel set to "centos7" not "7". The import from the old store would have still used "centos7" but when the charm was repacked and published I think things got changed to "7". As per Joe's comment, things are now
 centos#7#all
 centos#7#amd64

Juju cannot resolve "7" to anything meaningful whereas it could with "centos7".

There are several pieces that need fixing. One was fixing the charm to remove series from metadata (better doc is needed here). Another is a juju fix to properly interpret the (osname,version) tuple from the charm data model.

The juju fix is being worked on.