"repotool tags" and "repotool branches" fail with E155007 on svn repository

(Discovered while trying to get "make allcompare" work. I run svn 1.9.3 on Ubuntu and already tracked down the problem...)

When calling "repotool tags" or "repotool branches" inside of a svn repository directory, I get no tags/branches but just an error from SVN, complaining roughly (sorry, my message is in German and so of no real help here most probably) about error E155007: It has problems resolving "^/", which repotool uses to address the repository root directory (?). That's my guess at least; but as repotool is expected to be run in the root directory, too, this might be simply equivalent with the current directory.

So: Things start working when I patch

svn ls "^/

to

svn ls "file://`pwd`/

in all two occurences.