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Re: svn_fs_commit_txn and svn_repos_fs_commit_txn inconsistency

From: C. Michael Pilato <cmpilato_at_collab.net>
Date: Tue, 21 Dec 2010 14:40:01 -0500

On 12/21/2010 02:08 PM, Daniel Shahaf wrote:
> Blair Zajac wrote on Tue, Dec 21, 2010 at 10:55:37 -0800:
>> On 12/21/10 10:40 AM, Daniel Shahaf wrote:
>>> Blair Zajac wrote on Tue, Dec 21, 2010 at 10:16:56 -0800:
>>>> 4) In svn_repos_fs_commit_txn(), which order should errors be composed?
>>>> svn_fs_commit_txn()'s error as the parent followed by the
>>>> SVN_ERR_REPOS_POST_COMMIT_HOOK_FAILED error as a child? This seems to be
>>>> the standard ordering of chained errors. On the other hand, it makes it
>>>> harder to find a post-commit script error.
>>> Actually, it will make it impossible to detect post-commit errors over
>>> ra_dav, since that RA layer marshals only the outermost error code in an
>>> error chain.
>> ra_dav already checks for SVN_ERR_REPOS_POST_COMMIT_HOOK_FAILED, it could
>> use svn_error_has_cause() to find it.
> How can it do that if only the topmost error code is marshalled?
> I first discovered that ra_dav only marshals the outermost error code
> (and its error message, but nothing else of the chain) when I worked on
> the atomic-revprops branch. In dev@ archives there should be some
> discussions of how error chain marshalling might be implemented, but
> eventually I solved the problem differently for that branch (by using
> another error-signalling mechanism).
> ra_svn marshals full error chains.

Can we fix this? Can we introduce a new error code
SVN_ERR_RA_DAV_ERROR_CHAIN which means, "the descriptive message of this
error contains a skel which, when parsed, carries a whole chain of real
errors? Then we have the client indicate at capabilities-exchange time that
it can handle that kind of return.

C. Michael Pilato <cmpilato_at_collab.net>
CollabNet   <>   www.collab.net   <>   Distributed Development On Demand

Received on 2010-12-21 20:40:40 CET

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