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Re: revprop changes and hooks

From: Daniel Shahaf <d.s_at_daniel.shahaf.name>
Date: Wed, 16 Jun 2010 09:11:23 +0300 (Jerusalem Daylight Time)

Daniel Shahaf wrote on Wed, 16 Jun 2010 at 01:19 -0000:
> Philip Martin wrote on Tue, 15 Jun 2010 at 11:16 -0000:
> > Philip Martin <philip.martin_at_wandisco.com> writes:
> > > Putting the get, pre hook and set into a transaction would allow the
> > > action in the hook to accurately reflect the change made (or not made
> > > if the transaction fails).
> >
> > We don't need a new transaction to fix this, we can rev the
> > svn_fs_change_rev_prop interface instead:
> >
> > svn_error_t *
> > svn_fs_change_rev_prop(svn_fs_t *fs,
> > svn_revnum_t rev,
> > const char *name,
> > const svn_string_t *value,
> > apr_pool_t *pool);
> >
> > to include the current value of the revprop, and then reject the
> > change if the current value does not match. That should be simple
> > because the FSFS implementation already takes a write lock and the BDB
> > implementation already uses a transaction.
> >
>
> Testing a patch for this ^.
>

r955136. Comments welcome :-)

> Daniel
>
> > Then the repos layer can loop (in practice only if the
> > use_pre_revprop_change_hook flag is set):
> >
> > do
> > svn_fs_revision_prop(&current_value)
> > action = ...
> > svn_repos__hooks_pre_revprop_change(action)
> > error = svn_fs_change_rev_prop2(current_value, new_value)
> > while error is current value doesn't match
> >
> > This doesn't alter the fact that the revprop can change at any time
> > during the loop but that doesn't matter. The revprop is unversioned
> > so only the current state matters and the above will guarantee that
> > the current state when the change is made is equal to the state
> > validated by the pre-revprop-change hook.
> >
> >
>
Received on 2010-06-16 08:11:09 CEST

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