We have an edge case when the caller calls copymode with symlinks=True on an OS that doesn't have lchmod (ie any other than FreeBSD).

Should it be a nop (as in copystat), use chmod or raise an Exception?

I Personally (and some people on #python-dev) believe it should raise an Exception as the caller made the effort to say that (s)he wants the link _not_ to be followed and it's just one operation (contrary to copystat that does several things).