Using Apache handlers with Subversion

[Robert Leftwich <ro...@leftwich.info>]

I'm doing some playing around with Subversion running with Apache and I'd 
like to be able to use a handler (written in mod_python) for formatting 
certain files in the Subversion repository. A stripped down version of the 
config I am using successfully with a standard file system DAV is as follows:

<Location /fs-dav>
   AddHandler python-program cpp
   PythonHandler cpp-formatter
   Options +MultiViews
   MultiviewsMatch Handlers
   Dav On
</Location>

If I try the same thing in my svn location the handler never gets called 
(but the svn location is working correctly in all other respects).

<Location /svn-dav>
   AddHandler python-program cpp
   PythonHandler cpp-formatter
   Options +MultiViews
   MultiviewsMatch Handlers
   DAV svn
   SVNPath "/svn"
   SVNAutoversioning on
</Location>

Is there an explanation and/or work-around for this?

Robert



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Re: Using Apache handlers with Subversion

[Barry Pederson <bp...@barryp.org>]

Ben Collins-Sussman wrote:

> Robert Leftwich <ro...@leftwich.info> writes:
> 
> 
>>If I try the same thing in my svn location the handler never gets
>>called (but the svn location is working correctly in all other
>>respects).
> 
> I think the handlers only work on "real" files, not imaginary files.
> mod_dav_svn is serving up data from BDB in such a way as to circumvent
> the handlers.  Someone who knows more about apache can explain.

Would an output-handler work with Subversion?  mod_python can support 
those, but you'd have to alter your Python cpp-formatter a bit. (Is 
"cpp-formatter" really the name of your Python handler? I didn't think 
Python module names could have '-' in them.)

	Barry


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Re: Using Apache handlers with Subversion

[Justin Erenkrantz <ju...@erenkrantz.com>]

--On Friday, July 18, 2003 9:33 PM -0500 Ben Collins-Sussman 
<su...@collab.net> wrote:

> I think the handlers only work on "real" files, not imaginary files.
> mod_dav_svn is serving up data from BDB in such a way as to circumvent
> the handlers.  Someone who knows more about apache can explain.

Almost, but not quite.  =)

The default handler in httpd will deliver a file down the pipe.  However, 
handlers can not be chained together - only one can be used per request. 
mod_dav's handlers (which invoke mod_dav_svn's DAV hooks) service all of the 
operations on the repository - for a GET request, the mod_dav handlers push 
down the file data from the repository.  (Note that the lack of chaining 
handlers is why PHP and Subversion can't work together on the same location.)

However, output filters are what you'd want if you want to manipulate the data 
in an abstract way.  They can be chained on a request and are independent of 
its data source.  Take a look at mod_deflate or mod_include for examples of 
filters.  mod_python should support registration of filters, but I'm not aware 
of those semantics off the top of my head.  You'd have to be introduced to the 
wonderful world of buckets and brigades...  -- justin

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Re: Using Apache handlers with Subversion

[Ben Collins-Sussman <su...@collab.net>]

Robert Leftwich <ro...@leftwich.info> writes:

> If I try the same thing in my svn location the handler never gets
> called (but the svn location is working correctly in all other
> respects).
> 
> <Location /svn-dav>
>    AddHandler python-program cpp
>    PythonHandler cpp-formatter
>    Options +MultiViews
>    MultiviewsMatch Handlers
>    DAV svn
>    SVNPath "/svn"
>    SVNAutoversioning on
> </Location>
> 
> Is there an explanation and/or work-around for this?

I think the handlers only work on "real" files, not imaginary files.
mod_dav_svn is serving up data from BDB in such a way as to circumvent
the handlers.  Someone who knows more about apache can explain.

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