RFC: svn for make fetch

[b. f.]

>> I was hoping to get a bit more of a response to a recent posting of
>> mine with regard to using svn to fetch files for ports
>> My proposal: http://www.mail-archive.com/freebsd-ports@freebsd.org/msg23776.html
>> A summary of what has been going on:
>> http://wiki.freebsd.org/EitanAdler/ports-svn
>
>This was discussed many times before, and this is a bad idea.
>- No checksums -> security issue
>- No distfile caching/mirroring -> excess traffic consumption and
>  horrible availability
>and I hope you're not even thinking of fetching from VCS without
>specifying exact revision.
>
>Some standard way of generating distfiles from VCS may be nice though,
>if it goes into separate mk-file and supports all major VCS.

I also think this is a bad idea, even as a separate mk-file, for many
of the same reasons.  But it could be useful as a script in
ports/Tools.