Re: [PATCH] no mergeinfo on 'mergeinfo NON-affecting' wc-to-wc copy

Hi,

2008/9/10 Danil Shopyrin <danil_at_visualsvn.com>:
> Hi!
>
> Here is the patch that is trying to fix on of the problem discussed at
> http://svn.haxx.se/dev/archive-2008-08/0793.shtml
> [[
> 2) Mergeinfo produced during WC-to-WC copy differs from equivalent
> REPO-to-REPO copy. If you copy file in working copy and there is no
> mergeinfo in the working copy then the new file will get an empty
> mergeinfo record. Similar REPO-to-REPO copy operation doesn't produce
> empty mergeinfo record.
> ]]
>
> The general idea of the patch is as follows: we don't produce any
> mergeinfo record if we [definitely] know that it's unnecessary. The
> patch should ease the pain in the most cases. For example, it's not
> needed to worry about mergeinfo in the cases when:
> a. copy is performed within a working copy (it's just a 'local file
> rename because of refactoring')
> b. there is no merges except ones on the trunk/branches level (or
> there is no merges at all)
>

The patch looks correct, but I think it's more complicated than it
needs to be. I'd rather not put the extra checks in a different
function, and I don't think you need to extend
svn_client__get_wc_mergeinfo().

In propagate_mergeinfo_within_wc(), we need to do the following:

1. Get the mergeinfo for the source. If it's explicit, not inherited,
we're done, there's nothing to propagate, because the destination
already has the same explicit mergeinfo as the source, as a result of
the copy. Currently, propagate_mergeinfo_within_wc() calls
calculate_target_mergeinfo(), we can replace this with a call to
svn_client__get_wc_mergeinfo().
2. Figure out which path the destination inherits mergeinfo from, if any.
3. If the source and destination inherit from the same parent path (or
no path at all), we're done.
4. Add the mergeinfo to the destination.

If we want to be really smart, we can add a check between steps 1 and
2 to see if the source and destination are in the same directory, and
bail out if they are.

-- 
Vlad
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