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From: Junio C Hamano <gitster@pobox.com>
To: git@vger.kernel.org
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [PATCH v2 4/4] object-file: fix a unpack_loose_header() regression in 3b6a8db3b03
Date: Thu, 12 May 2022 16:39:12 -0700	[thread overview]
Message-ID: <xmqqo802codb.fsf@gitster.g> (raw)
In-Reply-To: <20220512223218.237544-5-gitster@pobox.com> (Junio C. Hamano's message of "Thu, 12 May 2022 15:32:18 -0700")

Junio C Hamano <gitster@pobox.com> writes:

> diff --git a/object-file.c b/object-file.c
> index 5ffbf3d4fd..b5d1d12b68 100644
> --- a/object-file.c
> +++ b/object-file.c
> @@ -2623,8 +2623,12 @@ int read_loose_object(const char *path,
>  		goto out;
>  	}
>  
> -	if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr),
> -				NULL) < 0) {
> +	switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr),
> +				    NULL)) {
> +	case ULHR_OK:
> +		break;
> +	case ULHR_BAD:
> +	case ULHR_TOO_LONG:
>  		error(_("unable to unpack header of %s"), path);
>  		goto out;
>  	}

Regarding this hunk, since we only care about a single "did we get
any error, or did we unpack OK" bit, I think this should be more
like

	if (unpack_loose_header(...) != ULHR_OK) {
		error(_("unable to..."), path);
		goto out;
	}

It is true, as Ævar mentioned, that there is another place in the
same file that uses switch() in loose_object_info(), and it should
remain to be switch() on the returned enum because it wants to
behave differnetly depending on the kind of error it gets.  But that
is not a reason to make this part that only cares about a single
"did it fail?" into a switch and force future developers to add a
useless case arm.

I left it there as posted in the previous round because I was too
lazy ;-) and also it is something we can clean up with a follow up
patch outside the series.  As my today's focus has been to reduce
the number of topics waiting for a reroll, I'd rather leave things
that are not outright broken but needs clean up as they are for the
sake of expediency.

Thanks.

  reply	other threads:[~2022-05-12 23:39 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-21 20:14 [PATCH 0/4] Fix issues and a regression noted by valgrind Ævar Arnfjörð Bjarmason
2022-04-21 20:14 ` [PATCH 1/4] tests: make RUNTIME_PREFIX compatible with --valgrind Ævar Arnfjörð Bjarmason
2022-04-21 22:22   ` Junio C Hamano
2022-04-21 20:14 ` [PATCH 2/4] log test: skip a failing mkstemp() test under valgrind Ævar Arnfjörð Bjarmason
2022-04-21 20:14 ` [PATCH 3/4] commit-graph.c: don't assume that stat() succeeds Ævar Arnfjörð Bjarmason
2022-04-21 22:29   ` Junio C Hamano
2022-04-21 20:14 ` [PATCH 4/4] object-file: fix a unpack_loose_header() regression in 3b6a8db3b03 Ævar Arnfjörð Bjarmason
2022-04-21 22:39   ` Junio C Hamano
2022-04-22  8:21     ` Ævar Arnfjörð Bjarmason
2022-05-12 22:32 ` [PATCH v2 0/4] test fixes around valgrind Junio C Hamano
2022-05-12 22:32   ` [PATCH v2 1/4] tests: using custom GIT_EXEC_PATH breaks --valgrind tests Junio C Hamano
2022-05-12 22:32   ` [PATCH v2 2/4] log test: skip a failing mkstemp() test under valgrind Junio C Hamano
2022-05-12 22:32   ` [PATCH v2 3/4] commit-graph.c: don't assume that stat() succeeds Junio C Hamano
2022-05-12 22:32   ` [PATCH v2 4/4] object-file: fix a unpack_loose_header() regression in 3b6a8db3b03 Junio C Hamano
2022-05-12 23:39     ` Junio C Hamano [this message]
2022-05-16 14:59       ` Derrick Stolee
2022-05-19 20:09         ` [RFC PATCH 0/2] Alternate ab/valgrind-fixes fix-up Ævar Arnfjörð Bjarmason
2022-05-19 20:09           ` [RFC PATCH 1/2] object-file API: fix obscure unpack_loose_header() return Ævar Arnfjörð Bjarmason
2022-05-19 20:09           ` [RFC PATCH 2/2] object-file API: have unpack_loose_header() return "int" again Ævar Arnfjörð Bjarmason
2022-05-20  4:27             ` Junio C Hamano

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