Fixing issue 644

Hi

I am looking at fixing issue 644
http://subversion.tigris.org/issues/show_bug.cgi?id=644
as it is one I trigger with my usage pattern. This is where a file
being added will overwrite an existing file over ra_dav since the
conflict is not detected.

There doesn't appear to be a way to detect the conflict on the server
since in dav_svn_open_stream() in mod_dav_svn/repos.c there doesn't
appear to be a way to distinguish updates from creates. Without
wishing to spend hours reading WebDAV specs, am I missing something?

Assuming it is hard for the server to do this, I was thinking of
getting the client to call svn_ra_dav__get_props_resource on the path
to be added, and detecting the conflict by the fact that the function
doesn't fail. Does this sound like the right solution?

-- 
Philip
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