Re: How to get next commit that just after a specified commit

[Philip Oakley <philipoakley@iee.org>]

On 13/02/2019 21:12, Junio C Hamano wrote:
> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
>
>> (Replying to
>> https://public-inbox.org/git/383c14cc.9289.168e61d39e8.Coremail.wuzhouhui14@mails.ucas.ac.cn/
>> which curiously I can see there, but not in my inbox (or spam))
>>
>> Git's data format doesn't make it easy to find "C" given "B" in a commit
>> chain like A->B->C (also there could be any number of "C"
>> successors). We need to walk the graph. This shows how to do it:
>>
>> https://sqlite.org/whynotgit.html#git_makes_it_difficult_to_find_successors_descendents_of_a_check_in
> Of course, the history is not necessarily linear.  Even though you
> *MUST* know all your parents before having a commit (which means
> that when you ask "what came before this commit", there is a
> definitive answer that everybody in the world would agree on), you
> by definition cannot know all the commits that are children of a
> commit (simply because somebody else may be creating a new one), so
> the question "what's the next commit" does not make any sense from
> that point of view ;-)

It will also depend on which heads (branches) one wishes to trace back 
from, or even know about. I'd expect that the default would just be the 
current branch (head) which would definitely limit the potential commit 
list.

--

Philip