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Re: Extending SVN_ASP_DOT_NET_HACK

From: Branko ─îibej <brane_at_xbc.nu>
Date: 2006-03-11 08:08:57 CET

Doyle, Patrick wrote:
> I see that SVN_ASP_DOT_NET_HACK is only enabled for Windows platforms.
> (And, given the use case it is targetted at, that is understandable.) I
> also see that, as it is implemented now, it allows for only one of two
> possible administrative directory names, ".svn" and "_svn". There is a
> comment in the code that the name must point to a statically allocated
> string constant to avoid potential pool lifetime issues.
>
> I would like to extend this capability to allow for an arbitrary
> administrative directory name specified by an environment variable,
> certainly for my own purposes, but possibly others would find this useful as
> well.
>
> So, I have 2 questions:
> 1) Where can I find out more information about the thought process that went
> into SVN_ASP_DOT_NET_HACK? I've tried search the issues database, and
> googling it in general, but haven't been able to find anything of substance.
>
Try the mailing list archives at http://svn.haxx.se/; search for
ASP.NET. It's a long, twisted, tortuous tale.

> 2) What happens to the pool management if there is a pointer to a string
> stored in the process's environment space? I suppose, on some processors,
> with some OS's, this may not be distinguishable from malloc()'d memory. But
> I don't know that for certain.
>
Pools have a limited lifetime, usually not controlled by the Subversion
library code. When a pool is destroyed (outside the library), all memory
allocated from it is freed. If the environment variable table happens to
refer to that freed memory, you've a good chance of crashing the client.

-- Brane

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Received on Sat Mar 11 08:09:18 2006

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