Merging with ancestor and DAG well-formedness

Mads Kiilerich mads at
Thu Dec 30 11:04:45 CST 2010

On 12/30/2010 05:25 PM, Wagner Bruna wrote:
> On 12/25/2010 10:26 PM, Mads Kiilerich wrote:
>> Please share your opinion here or comment on
>> .
>> Is it an implicit invariant in the Mercurial repository data model that
>> a merge always merges changesets that not are each others
>> ancestor/descendant? Or is it only something that mostly is enforced at
>> the command line API?
>> Is it a bug if we somehow ends up with a merge changeset where the
>> parents are linearly related?
> Since merges between ancestors can happen rather easily in workflows
> using named branches (see eg. crew 15b8a652b558 or 3cb0559e44d0), IMHO
> the code needs to deal properly with those.


After 9e7e24052745 "properly" is defined as a fast forward merge, giving 
a changeset with one parent which is on another branch.


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