Re: [PATCH] sequencer: fix gpg option passed to octopus merge

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

Thanks for the patch Samuel

On 12/10/2020 11:34, Johannes Schindelin wrote:
> Hi,
> 
> On Sun, 11 Oct 2020, brian m. carlson wrote:
> 
>> On 2020-10-11 at 22:48:04, Samuel Čavoj wrote:
>>> When performing octopus merges with interactive rebase with gpgsign
>>> enabled (either using rebase -S or config commit.gpgsign), the operation
>>> would fail on the merge. Instead of "-S%s" with the key id substituted,
>>> only the bare key id would get passed to the underlying merge command,
>>> which tried to interpret it as a ref.
>>>
>>> Signed-off-by: Samuel Čavoj <samuel@cavoj.net>
>>> ---
>>> It is unclear to me whether I should have based this off of maint or
>>> master, master made more sense to me. I apologize if maint was the
>>> correct one, please tell and I will resubmit.
>>> ---
>>>   sequencer.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/sequencer.c b/sequencer.c
>>> index 00acb12496..88ccff4838 100644
>>> --- a/sequencer.c
>>> +++ b/sequencer.c
>>> @@ -3677,7 +3677,7 @@ static int do_merge(struct repository *r,
>>>   		strvec_push(&cmd.args, "-F");
>>>   		strvec_push(&cmd.args, git_path_merge_msg(r));
>>>   		if (opts->gpg_sign)
>>> -			strvec_push(&cmd.args, opts->gpg_sign);
>>> +			strvec_pushf(&cmd.args, "-S%s", opts->gpg_sign);
>>
>> Yeah, this seems obviously correct, and it's very similar to what we do
>> elsewhere in the file.
In run_git_commit() we do

	if (opts->gpg_sign)
		strvec_pushf(&cmd.args, "-S%s", opts->gpg_sign);
	else
		strvec_push(&cmd.args, "--no-gpg-sign");

I'm not immediately clear why we pass --no-gpg-sign when opts->gpg_sign 
isn't set but it makes me wonder if we should be doing that here as well

>  This will also handle the case where the option
>> is empty (because we want to do autodetection of the key to sign)
>> correctly as well.
> 
> ACK
> 
> It is unclear to me whether we want to bother introducing a test case for
> this; Octopus merges are somewhat rare...

This code path is used whenever the user specifies a merge strategy 
other than "recursive" or they pass merge strategy options to any merge 
strategy including "recursive" so while octopus merges may be rare the 
union of everything other than a plain recursive merge may not be.

Best Wishes

Phillip

> 
> Ciao,
> Dscho
>