csd Ok, I've reproduced this issue on HTTPS and it does appear to be the problem mentioned that the link you shared.
At this time we don't have a solution to make this work over HTTPS but I'll post an update here when we do.
If you need to use svn copy
securely then you'll need to do that via svn+ssh, eg:
svn copy svn+ssh://user@opalN.opalstack.com:/home/user/apps/svn/repo/trunk \
svn+ssh://user@opalN.opalstack.com:/home/user/apps/svn/repo/branches/newbranch \
-m "new branch"
You could also do this locally on the server as the SVN app's shell user using file:///
URLs:
svn copy file:///home/user/apps/svn/repo/trunk \
file:///home/user/apps/svn/repo/branches/newbranch \
-m "new branch"
Note that you can do this without affecting your working copy since you can run svn copy
outside of your wc. You'll still want to do svn up
within the wc to pick up the new branch.
Hope this helps!