From: Patrick Steinhardt <ps@pks.im>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
Subject: Re: [PATCH 2/2] config: allow specifying config entries via envvar pairs
Date: Wed, 18 Nov 2020 14:56:50 +0100 [thread overview]
Message-ID: <X7UoIjflsJe7xOx8@ncase> (raw)
In-Reply-To: <87d00arczw.fsf@evledraar.gmail.com>
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On Wed, Nov 18, 2020 at 02:49:39PM +0100, Ævar Arnfjörð Bjarmason wrote:
>
> On Tue, Nov 17 2020, Junio C Hamano wrote:
>
> > Patrick Steinhardt <ps@pks.im> writes:
> >
> >>> 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?)
> >>
> >> You only have to unset `GIT_CONFIG_KEY_1` as the parser will stop
> >> iterating on the first missing key. More generally, if you set `n` keys,
> >> it's sufficient to unset key `n+1`.
> >
> > Yes, but those who want to set N keys would likely to be content
> > with setting 1..N and happily forget unsetting N+1, and that is
> > where "how would one cleanse the environment to give a clean slate?"
> > comes from.
>
> Not as an argument from whataboutism, but just to note a bug/existing
> prior art:
>
> Nobody in this thread has mentioned GIT_PUSH_OPTION_* which works pretty
> much like Patrick's suggestion, and it looks like --local-env-vars
> misses those:
>
> $ GIT_PUSH_OPTION_0=foo GIT_PUSH_OPTION_COUNT=20 git rev-parse --local-env-vars | grep GIT_PUSH
> $
>
> I haven't tested this, but I expect there's a bug where a push hook
> itself does a local push to another repo and that repo has a hook, that
> the push options are erroneously carried forward to the sub-process.
>
> That might also be a feature, depending on your point of view.
I didn't actually know about it, thanks for pointing it out!
If we're going to use the same `_COUNT` approach, then I think the
issues which were discussed would mostly go away. No gaps needed, no
requirement to unset `$n+1`. Any properly behaving user would know to
set it as otherwise the written code/script cannot work. Also,
git-rev-parse(1) wouldn't have to dynamically adjust based on whether a
previously existing gap was filled with new keys or not.
I'd be happy to pursue that road, but I'll wait for some feedback first.
Patrick
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next prev parent reply other threads:[~2020-11-18 13:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 12:16 [PATCH 0/2] config: allow specifying config entries via envvar pairs 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
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 [this message]
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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