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https://issues.apache.org/jira/browse/SVN-4890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17508500#comment-17508500
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Daniel Shahaf commented on SVN-4890:
------------------------------------
Here's a test for this:
{code}
Index: subversion/tests/cmdline/upgrade_tests.py
===================================================================
--- subversion/tests/cmdline/upgrade_tests.py (revision 1899016)
+++ subversion/tests/cmdline/upgrade_tests.py (working copy)
@@ -339,6 +339,12 @@ def upgrade_with_externals(sbox):
expected_stderr = wc_is_too_old_regex
svntest.actions.run_and_verify_svn(None, expected_stderr,
'info', sbox.wc_dir)
+
+ # Verify that upgrading the external is rejected (issue #4890)
+ svntest.actions.run_and_verify_svn(None, svntest.verify.AnyOutput,
+ 'upgrade',
+ sbox.ospath('A/C/exdir_H'))
+
# Now upgrade the working copy
svntest.actions.run_and_verify_svn(None, [],
'upgrade', sbox.wc_dir)
{code}
> 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
> Priority: Major
> Labels: api
> Fix For: 1.15.0
>
>
> Daniel Shahaf wrote, in dev@ email "multi-wc-format: upgrading externals"
> (https://mail-archives.apache.org/mod_mbox/subversion-dev/202202.mbox/%3C20220219144836.GA2817%40tarpaulin.shahaf.local2%3E):
> 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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