[llvm-dev] Pushing a patch for someone else

[Krzysztof Parzyszek via llvm-dev]

> You want to add two lines to it:
>
> Patch by <name of author>

You can just set the original author in the commit.  Git distinguishes between the author and the committer.


--
Krzysztof Parzyszek  kparzysz at quicinc.com   AI tools development

-----Original Message-----
From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of via llvm-dev
Sent: Thursday, January 28, 2021 10:01 AM
To: paul at windfall.com; llvm-dev at lists.llvm.org
Subject: [EXT] Re: [llvm-dev] Pushing a patch for someone else



> -----Original Message-----
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Paul C.
> Anagnostopoulos via llvm-dev
> Sent: Thursday, January 28, 2021 10:45 AM
> To: llvm-dev at lists.llvm.org
> Subject: [llvm-dev] Pushing a patch for someone else
>
> Could someone explain the best way to push a patch for someone else? I
> don't use Arcanist, but add the Differential Revision line by hand.
> Please include the method of downloading the person's patch to my machine.

It's a bit of a manual process given that we don't use branches and a pull-request model as GitHub favors, but it's not hard.
I don't think I've done this myself since the move to github so I might be missing a step, hopefully others will chime in to fix my mistakes.

Assuming the patch is in a Phabricator review, there should be a "Download Raw Diff" link on the right-hand side at the top.  This, oddly enough, should download a diff file, which you can then apply to your working tree with "patch" or similar utility.

What I do then is copy the summary into a text file, making sure the formatting looks reasonable.  You want to add two lines to it:

Patch by <name of author>

Differential Revision: https://reviews.llvm.org/Dxxxxx

filling in the author and actual review number.  Make sure there's a blank line before the Differential Revision line.

Then you commit this as usual, but add the --author option to provide (I think) the email address of the author.  (This might be redundant with the "Patch by" information, so the current practice might be to leave out "Patch by", not sure.)  And of course -F to specify the file where you put the commit message.

Once it's committed, do the usual build/test/push.

HTH,
--paulr

>
> Needless to say, I've never done this before.
>
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