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From: Junio C Hamano <gitster@pobox.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Patrick Steinhardt <ps@pks.im>, git@vger.kernel.org
Subject: Re: [PATCH 2/2] config: allow specifying config entries via envvar pairs
Date: Mon, 16 Nov 2020 11:39:35 -0800	[thread overview]
Message-ID: <xmqqy2j1851k.fsf@gitster.c.googlers.com> (raw)
In-Reply-To: <87mtzlflw7.fsf@evledraar.gmail.com> (=?utf-8?B?IsOGdmFyIEFy?= =?utf-8?B?bmZqw7Zyw7A=?= Bjarmason"'s message of "Fri, 13 Nov 2020 14:04:40 +0100")

Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:

> On Fri, Nov 13 2020, Patrick Steinhardt wrote:
>
>> While not document, it is currently possible to specify config entries
>
> "While not documented..."
>
>> +		strbuf_addf(&envvar, "GIT_CONFIG_KEY_%d", i);
>> +		if ((key = getenv(envvar.buf)) == NULL)
>> +			break;
>
> The convention in git.git is to avoid explicit NULL checks. So maybe
> something like this, which also avoids the assignment inside an "if"
>
>     key = getenv(envvar.buf);
>     if (!key)
>         break;

All good suggestions, but...

"While not documented" yes, for sure, but we do not document it for
a good reason---it is a pure implementation detail between Git
process that runs another one as its internal implementation detail.

I especially do not think we want to read from unbounded number of
GIT_CONFIG_KEY_<N> variables like this patch does.  How would a
script cleanse its environment to protect itself from stray such
environment variable pair?  Count up from 1 to forever?  Run "env"
and grep for "GIT_CONFIG_KEY_[0-9]*=" (the answer is No.  What if
some environment variables have newline in its values?)


  reply	other threads:[~2020-11-16 19:41 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-13 12:16 [PATCH 0/2] " Patrick Steinhardt
2020-11-13 12:16 ` [PATCH 1/2] config: extract function to parse config pairs Patrick Steinhardt
2020-11-13 12:16 ` [PATCH 2/2] config: allow specifying config entries via envvar pairs Patrick Steinhardt
2020-11-13 13:04   ` Ævar Arnfjörð Bjarmason
2020-11-16 19:39     ` Junio C Hamano [this message]
2020-11-17  2:34       ` Jeff King
2020-11-17  6:37         ` Patrick Steinhardt
2020-11-17  7:01           ` Jeff King
2020-11-17 14:22         ` Ævar Arnfjörð Bjarmason
2020-11-17 23:57           ` Jeff King
2020-11-18 13:44             ` Ævar Arnfjörð Bjarmason
2020-11-18  0:50         ` brian m. carlson
2020-11-18  1:59           ` Jeff King
2020-11-18  2:25             ` brian m. carlson
2020-11-18  7:04               ` Patrick Steinhardt
2020-11-19  2:11                 ` brian m. carlson
2020-11-19  6:37                   ` Patrick Steinhardt
2020-11-18  5:44           ` Junio C Hamano
2020-11-17  6:28       ` Patrick Steinhardt
2020-11-17  7:06         ` Junio C Hamano
2020-11-18 13:49           ` Ævar Arnfjörð Bjarmason
2020-11-18 13:56             ` Patrick Steinhardt
2020-11-18 16:01             ` Junio C Hamano
2020-11-17 14:03       ` Ævar Arnfjörð Bjarmason
2020-11-13 16:37   ` Philip Oakley
2020-11-17  6:40     ` Patrick Steinhardt
2020-11-13 13:11 ` [PATCH 0/2] " Ævar Arnfjörð Bjarmason

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