Re: [PATCH v2] [GSOC] cherry-pick: fix bug when used with GIT_CHERRY_PICK_HELP

[Phillip Wood <phillip.wood123@gmail.com>]

Hi ZheNing

On 28/07/2021 08:39, ZheNing Hu wrote:
> Phillip Wood <phillip.wood123@gmail.com> 于2021年7月28日周三 上午3:43写道：
>>
>>> diff --git a/builtin/revert.c b/builtin/revert.c
>>> index 237f2f18d4c..ec0abe7db73 100644
>>> --- a/builtin/revert.c
>>> +++ b/builtin/revert.c
>>> @@ -245,6 +245,7 @@ int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
>>>
>>>        opts.action = REPLAY_PICK;
>>>        sequencer_init_config(&opts);
>>> +     unsetenv("GIT_CHERRY_PICK_HELP");
>>
>> This will break git-rebase--preserve-merges.sh which uses
>> GIT_CHERRY_PICK_HELP to set the help and ensure CHERRY_PICK_HEAD is
>> removed when picking commits. I'm a bit confused as to what the problem
> 
> Yeah, I thought it would call some rebase-related code before, I
> didn’t expect it to
> call cherry-pick. On the other hand, I passed all tests, so I ignore
> it, there should be
> a test for it.
> 
>> is - how is 'git cherry-pick' being run with GIT_CHERRY_PICK_HELP set in
>> the environment outside of a rebase (your explanation in [1] does not
>> mention how GIT_CHERRY_PICK_HELP is set)? As far as I can see 'git
>> rebase -i' does not set it so the only case I can think of is
>> cherry-picking from an exec command  while running 'git rebase -p'
>>
> 
> Ah, because I want to find a way to suppress its advice messages about
> "git commit",
> and I don’t think anyone else is using this "feature".

I'd welcome a patch to improve the advice. I suspect the current advice 
predates the introduction of the '--continue' flag for cherry-pick. I 
think that would be a better route forward as it would benefit all 
users. Setting GIT_CHERRY_PICK_HELP is undocumented and has always 
removed CHERRY_PICK_HEAD since CHERRY_PICK_HEAD was introduced in commit
7e5c0cbf (Introduce CHERRY_PICK_HEAD, 2011-02-19).

Best Wishes

Phillip


>> Best Wishes
>>
>> Phillip
>>
>> [1]
>> https://lore.kernel.org/git/CAOLTT8Ty47fyY7T3d68CYPKh9k+HAHsnCLJ=F0KaLm+0gp3+EQ@mail.gmail.com/
>>
> 
> Thanks.
> --
> ZheNing Hu
>