We upgraded from wheezy to jessie

We have an SVN-backed ikiwiki with CGI enabled

After upgrading, editing via the web interface/CGI failed with an obscure error about "no element found",
similar to https://ikiwiki.info/forum/using_svn+ssh_with_ikiwiki/

Editing and committing via SVN resulted in a silent failure of the post-commit hook.

Running ikiwiki-mass-rebuild revealed the problem: ikiwiki's own working copy of the wiki needed "svn upgrade"
running on it as SVN had updated versions. Once this was done, a mass-rebuild put us back in working order.

It would be nice if the upgrade process automatically ran svn update.