From: Alejandro Colomar <alx@kernel.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: Phillip Wood <phillip.wood123@gmail.com>, git@vger.kernel.org
Subject: Re: git-cherry-pick(1) -- path
Date: Sat, 11 May 2024 13:46:57 +0200 [thread overview]
Message-ID: <bpjfsabhstkbuvo6ksj3owoxvutgquripmqmqi63ykaquhky2u@r7mfrwucgnye> (raw)
In-Reply-To: <xmqqcypt61lo.fsf@gitster.g>
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Hi Phillip, Junio,
On Fri, May 10, 2024 at 10:03:31AM GMT, Junio C Hamano wrote:
> Phillip Wood <phillip.wood123@gmail.com> writes:
>
> >>> $ git format-patch --stdout -1 $ThatCommit -- $ThisPath |
> >>> git am -3
> >> Hmmm, I hadn't thought of that; very interesting!
> >> Although I have some concerns with git-am(1); basically that it's
> >> almost
> >> clueless when there's a conflict.
> >
> > "git am -3" should be fine here as you're guaranteed to have the
> > necessary blobs available to create conflicts - this is what "git
> > rebase --apply" does.
>
> Good thing to point out. "am -3" is just as good for this purpose
> and "almost clueless" is a derogatory comment that requires an
> apology ;-)
Huh, I am quite surprised by `git am -3`. I've tried it just now, and
it's amazing. I certainly must apologize. :-)
I tried it yesterday, but the patches were from a different repo, and
not available locally, so it really didn't do anything. But now I tried
it within the same repo, and it's really nice!
> > As far as the implementation goes I haven't thought too deeply but I
> > suspect we'd want to create a couple of trees based on the commit we
> > want to cherry-pick and its parent filtered by the pathspec and use
> > those in the tree-way merge with HEAD.
>
> If we were to use the ort machinery, it may not be too bad to use
> the pathspec only at the final writeout phase. That is, perform a
> full cherry-pick in the in-core index, reset all the entries in the
> in-core index back to HEAD that are outside the given pathspec, and
> then write out the result to the working tree. That way, an old
> change that was made to paths at the original location can be cherry
> picked to a much newer tree after these paths have been moved to a
> different location. Doing the same with the recursive machinery
> would be missier but perhaps the more recent merge-tree that uses
> the ort machinery to work purely in-core might be a good way to go.
I didn't understand the last part well, but I guess I may do when I
start researching into it. :)
Apart from <builtin/revert.c>, do you recommend I look into any
particular files?
Thanks!
And have a lovely weekend!
Alex
--
<https://www.alejandro-colomar.es/>
A client is hiring kernel driver, mm, and/or crypto developers;
contact me if interested.
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next prev parent reply other threads:[~2024-05-11 11:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-09 22:32 git-cherry-pick(1) -- path Alejandro Colomar
2024-05-10 1:15 ` Junio C Hamano
2024-05-10 9:05 ` Alejandro Colomar
2024-05-10 10:00 ` Phillip Wood
2024-05-10 17:03 ` Junio C Hamano
2024-05-11 11:46 ` Alejandro Colomar [this message]
2024-05-11 15:01 ` Phillip Wood
2024-05-11 20:08 ` Alejandro Colomar
2024-05-12 15:35 ` Alejandro Colomar
2024-05-13 15:16 ` Phillip Wood
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