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Re: [MirageOS-devel] Irmin merge question

As far as I can tell from the code, cases when lca=t1 or lca=t2 are handled by 
the âdefault' method so the custom defined merge is not called.
But this was not always the case - in some revisions of ir_merge.ml the 
âdefaultâ ( in method bijectâ ) was not called first :
Commits on Mar 4,Feb 6, Feb 2 2015 - call âdefaultâ first
Commits on Jan 27, Jan 26, Jan 12 2015 - donât call âdefaultâ first
Commits on Jan 11 2015, and older - call âdefaultâ first

So it changed back and forth. I am not sure what the intention was but I think 
having the ability to custom-handle all cases is preferred?


> On Aug 5, 2015, at 11:45 PM, Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx> wrote:
>> I have a question about Irmin merge call back for user-defined contents. It 
>> appears that merge is only called for the content that was changed but not 
>> added or deleted. Is it possible to have it called for all actions?
> It's supposed to be called even when one of the version is added or deleted. 
> In that case one of the values will be a None. That's why the merge callback 
> [1] takes an option type. Notice that you should not normally have None for 
> all the 3 elements of the 3-way merge.
> Best,
> Thomas
> [1] http://mirage.github.io/irmin/Irmin.Contents.S.html#VALmerge

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