[jira] [Created] (SVN-4890) multi-wc-format: should we forbid upgrading an external WC to mismatch its parent WC format?

["Julian Foad (Jira)" <ji...@apache.org>]

Julian Foad created SVN-4890:
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             Summary: multi-wc-format: should we forbid upgrading an external WC to mismatch its parent WC format?
                 Key: SVN-4890
                 URL: https://issues.apache.org/jira/browse/SVN-4890
             Project: Subversion
          Issue Type: Improvement
            Reporter: Julian Foad


Daniel Shahaf wrote, in dev@ email "multi-wc-format: upgrading externals":

multi-wc-format/BRANCH-README mentioned this:

> [*] New externals working copies must inherit the format from their
> parent working copy, because mixed-format working copies are a) a
> Bad Thing, and b) defeat the purpose of this feature, which is
> support for multiple versions of the client in the same working
> copy.

Upgrading a parent working copy upgrades external wc's too. However,
upgrading an external succeeds. Judging by the quoted remark, should
«svn upgrade --compatible-version=$N /path/to/external» error out unless
the external's parent working copy is already at version $V?



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