we need to delete the target symlink first before we can create it

This solved the issue with symlinks to directories. The semantic
of `ln -fs' is special if you run it for directories twice, e.g.

mkdir from
ln -sf from to
find . -name from -or -name to
./to
./from

now run it again
ln -sf from to

find . -name from -or -name to
./to
./from
./from/from

ls -l from
total 1
lrwxrwxr-x 1 wosch devel 4 Oct 6 13:54 from -> from

PR: 222737