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From: Patrick Steinhardt <ps@pks.im>
To: "brian m. carlson" <sandals@crustytoothpaste.net>,
	"Jeff King" <peff@peff.net>, "Junio C Hamano" <gitster@pobox.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	git@vger.kernel.org
Subject: Re: [PATCH 2/2] config: allow specifying config entries via envvar pairs
Date: Wed, 18 Nov 2020 08:04:30 +0100
Message-ID: <X7THfjaP91+GV//V@ncase> (raw)
In-Reply-To: <20201118022532.GD389879@camp.crustytoothpaste.net>

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On Wed, Nov 18, 2020 at 02:25:32AM +0000, brian m. carlson wrote:
> On 2020-11-18 at 01:59:07, Jeff King wrote:
> > Yes, I think concatenating uri_encode(key) + "=" + uri_encode(value)
> > would be easier to reason about, and solves the ambiguity problem. If we
> > are willing to break from the existing format, it's probably a
> > reasonable direction.
> 
> We'll have to deal with embedded NULs, but other than that it seems
> robust and easy to reason about.  I like the proposal below better,
> though.

This would be easy enough to handle and fixes all the problems I
currently have.

> > I wondered at first how this is different from:
> > 
> >   git -c a.b.c=value foo
> > 
> > but I guess it is meant to do the same environment-lookup? We could
> > probably add:
> > 
> >   git --env-config a.b.c=ENV_VAR foo
> > 
> > to have Git internally stick $ENV_VAR into $GIT_CONFIG_PARAMETERS. That
> > avoids all of the rev-parse rigamarole, keeps the format of the
> > environment variable opaque, and solves Patrick's problem of putting the
> > value onto the command-line.
> 
> Sure, that could be an option.  It's the simplest, and we already know
> how to handle config this way.  People will be able to figure out how to
> use it pretty easily.

At first, this idea sounds quite interesting. But only until one
realizes that it's got the exact same problem which I'm trying to solve:
there's still a point in time where one can observe config values via
the command line, even though that moment now is a lot shorter compared
to running the "real" git command with those keys.

> > It doesn't solve the ambiguity with "=" in the subsection, but IMHO that
> > is not all that important a problem.
> 
> I'm fine with saying that we don't support environment variable names
> with equals signs and just going with that.  It solves the ambiguity
> problem and I'm not sure that they could usefully work on Unix anyway.
> 
> Moreover, people usually use the unrestricted data in the second chunk
> for URLs, which shouldn't have unquoted equals signs.  You could
> technically name other second fields that way, but why would you when
> you could just not?
> 
> So I'm not too worried about it either way.

There's not only URLs though, but also paths in 'includeIf.*.path'.
Sure, it's unlikely that paths have an equals sign embedded. But I think
we should try to not paint ourselves into a corner.

This problem also would be nicely solved by URI-encoding both key and
value and then passing it via GIT_CONFIG_PARAMETER.

Patrick

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  reply	other threads:[~2020-11-18  7:05 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
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 [this message]
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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