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Re: [PATCH v2] Simplify handling of setup_git_directory_gently() failure cases.




Jeff King <peff@xxxxxxxx> writes:

> On Tue, Dec 18, 2018 at 12:54:02PM -0800, Erin Dahlgren wrote:
> ...
>> GIT_DIR_HIT_MOUNT_POINT. I'm not sure how important of a guarantee it
>> is, but we should respect what's documented.
>
> Yeah, agreed.
>
> Another benefit of avoiding the early return is that we hit the cleanup
> code at the end of the function. That saves us having to release "dir"
> here. I assume we don't have to care about "gitdir" in these cases, but
> hitting the cleanup code means we don't even have to think about it.
>
> Over in:
>
>   https://public-inbox.org/git/20181219154853.GC14802@xxxxxxxxxxxxxxxxxxxxx/
>
> I suggested adding more cleanup to that block, too (though I _think_ in
> these cases it would also be a noop, it's again nice to not have to
> worry about it).
>
>> Side note: One of the secondary goals of my patch was to make it
>> really obvious that neither the GIT_DIR_HIT_CEILING nor the
>> GIT_DIR_HIT_MOUNT_POINT case can get us into the block protected by
>> (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT)). With
>> your suggestion (and it's a fair one) I don't think that's feasible
>> without more significant refactoring. Should I just settle with a
>> comment that explains this?
>
> Yeah, I think a comment would probably be sufficient. Though we could
> also perhaps make the two cases (i.e., we found a repo or not) more
> clear. Something like:
>
>   if (!*nongit_ok || !*nongit_ok) {

WTH is (A || A)?

> 	startup_info->have_repository = 1;
> 	startup_info->prefix = prefix;
> 	if (prefix) ...etc...
>   } else {
> 	start_info->have_repository = 0;
> 	startup_info->prefix = NULL;
> 	setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
>   }
>
> That may introduce some slight repetition, but I think it's probably
> clearer to deal with the cases separately (and it saves earlier code
> from make-work like setting prefix=NULL when there's no repo).

Sounds good.

Thanks both.