Tree conflict merry-go-round on update/switch

Hi tree conflict fans,

I had another look at Mark Phippard's experiment with creating
a tree conflict during update (local edit, incoming delete,
aka use case 2). That's a tricky one to recover from.

Mark's original mail is here:

<http://svn.haxx.se/dev/archive-2008-10/1090.shtml>

If we skip the update of the victim, to be consistent with
other tree conflicts, then the user has to resolve the conflict
and update again before (optionally) re-adding the victim and
committing the local changes.

I fixed some of the problems that Mark noticed, but not all.
There is a blocker in that the "update again" step creates a
fresh tree conflict. Doh!

An obvious solution is to record the tree conflict as resolved
with regard to the incoming version. At a minimum, we need to
record the incoming svn_wc_conflict_version_t; if an update or
switch to the same URL_at_REV occurs, it will remove the resolved-
version data and not create a tree conflict. An update/switch
to a different URL_at_REV would create a new tree conflict.

An alternative design is to add a boolean "resolved" field to
the existing svn_wc_conflict_description_t. The resolve[d]
commands would leave the tree conflict data in place, to be
removed by update/switch to the same URL_at_REV. An update/switch
to a different URL_at_REV would create a new tree conflict with
resolved=FALSE.

A third alternative is simply to not include update/switch tree
conflicts in 1.6.

Comments, anyone?

Steve

-- 
Stephen Butler | Software Developer
elego Software Solutions GmbH
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