evolve: commit the transaction if conflicts occur while merging content-div
Yes, let's commit the transaction in case conflicts occur. Yes, this is what
unshelve does and this is one of the reasons we don't like unshelve.
Previous patches added support for resolving content-divergence when they are on
different parents with parent of one being the gca. In such cases, we relocate
one of the divergent commit to the parent of another one.
All the relocation stuff and merging divergent changeset stuff happens in a
single transaction, so if there are conflicts while merging, we abort and the
transaction rollsback and our relocated commit is not applied after abort.
We don't want to process the relocation because that can lead to conflicts and
we will have dirty wdir because of resolving conflicts.
So, we commit the transaction when merging results in conflicts to make sure if
relocation happened, we commit that.
This fixes the absence of relocation commit found in previous patch and uncover
a new bug about handling of relocated commit. Upcoming patch will fix it.
.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
.. Logilab SA <contact@logilab.fr>
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Good practice for (early) users of evolve
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Avoid unstability
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The less unstability you have the less you need to resolve.
Evolve is not yet able to detect and solve every situation. And your mind is
not ready neither.
Branch as much as possible
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This is not MQ; you are not constrained to linear history.
Making a branch per independent branch will help you avoid unstability
and conflict.
Rewrite your changes only
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There is no descent conflict detection and handling right now.
Rewriting other people's changesets guarantees that you will get
conflicts. Communicate with your fellow developers before trying to
touch other people's work (which is a good practice in any case).
Using multiple branches will help you to achieve this goal.
Prefer pushing unstability to touching other people changesets
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If you have children changesets from other people that you don't really care
about, prefer not altering them to risking a conflict by stabilizing them.
Do not get too confident
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This is an experimental extension and a complex concept. This is beautiful,
powerful and robust on paper, but the tool and your mind may not be prepared for
all situations yet.