Re: [PATCH 1/2] am -3: allow nonstandard -p<num> option

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Jeff King <peff@xxxxxxxx> writes:

> On Tue, Feb 28, 2012 at 03:24:54PM -0800, Junio C Hamano wrote:
>
>> When falling back to 3-way merge, we run "git apply" to synthesize the
>> fake ancestor tree by parsing the incoming patch, and another "git apply"
>> to apply the patch to the fake ancestor tree.  Both invocation need to
>> be aware of the custom -p<num> setting to parse patches that were prepared
>> with non-standard src/dst prefix.
>
> Makes sense. One question:
> ...
> $git_apply_opt can have other stuff in it, too (from my cursory reading,
> it looks like --whitespace, --directory, --exclude, -C, --reject,
> --ignore-whitespace, and --ignore-space-change).  Those options are now
> passed, too.
>
> Naively, I don't think it should be a problem. Many of them will do
> nothing (because the patch _should_ apply cleanly to the blobs it
> mentions). Some seem like an obvious improvement (e.g., "--directory"
> should be just as necessary as "-p", I would think). For something like
> "--whitespace=error", I would think we would have errored out already
> when we first tried to apply the patch. Or maybe not. I didn't test.

An honest answer is that I didn't think deeply if they matter ;-).

Certainly we would want to honor the original settings for whitespace
errors by propagating the option, so that we would reject or adjust when
synthesizing the fake ancestor tree the same way as we deal with them when
apply the patch for real.
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