Request: make the user agent string a define

Hi,

A feature which is requested often on the TSVN mailing list is the
ability to check the client version in a pre-commit hook.
(the latest request was because they wanted to reject commits from TSVN
clients which don't have the bugtraq features implemented yet)

I've searched the mailing lists and found that this is already possible
if the repository is hosted on an Apache server.
(http://svn.haxx.se/dev/archive-2003-05/1680.shtml)

Then I looked at the source where that agent string is set/sent:
subversion/libsvn_ra_dav/session.c, line 659,660 (1.1.2 tag)
   ne_set_useragent(sess, "SVN/" SVN_VERSION);
   ne_set_useragent(sess2, "SVN/" SVN_VERSION);

As it is now, another client can't change that string to something else
(e.g. "TSVN/1.1.2"), so I'd like to request that this is changed into a
define (which of course defaults to "SVN/"SVN_VERSION) but can be
changed by a client when compiling/linking to the Subversion libs.

Better would be a new function to set that string (usefull for those
clients which use the precompiled language bindings).

Even better would be if Subversion would allow to set revprops with
every command that affects the repository. That way, a new revprop (e.g.
svn:user-agent) could be written every time. This would also have the
advantage that you could later check each revision and find out with
which client is was made. And of course it wouldn't be restricted to
Apache based repositories.

Stefan

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