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From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: Patrick Steinhardt <ps@pks.im>, git@vger.kernel.org
Subject: Re: [PATCH] config: Introduce GIT_CONFIG_NOGLOBAL
Date: Thu, 08 Apr 2021 16:43:08 -0700
Message-ID: <xmqq35w0qr5f.fsf@gitster.g> (raw)
In-Reply-To: <YG+PLROZbSo32F3k@coredump.intra.peff.net> (Jeff King's message of "Thu, 8 Apr 2021 19:18:05 -0400")

Jeff King <peff@peff.net> writes:

>>  (3) when set to any other string, it is taken as a filename that
>>      has the global configuration.  Unlike $HOME/.gitconfig or
>>      $XDG_HOME/git/config, it is an error if the named file does not
>>      exist (this is to catch misconfiguration).
>> 
>> And once this is accepted by users and established as a pattern, we
>> could migrate GIT_CONFIG_NOSYSTEM to GIT_CONFIG_SYSTEM=/dev/null
>
> That seems pretty reasonable. I'm on the fence on your (3). Conceivably
> somebody could want to override the baked-in defaults without being sure
> the file is present. But I'm not sure how useful that would be in
> practice.

I was also on the fence.  

If your plan is to create $HOME/.alternate-config and point at it by
setting GIT_CONFIG_GLOBAL=$HOME/.alternate-config, there are two
places you can make typo.  You may write a file with a wrong name.
You may export a variable with a wrong name.

> Some other things to consider:
>
>   - does setting GIT_CONFIG_GLOBAL override both the $HOME and
>     $XDG_CONFIG_HOME? If the plan is to override them, that makes sense.
>     But we do usually read from both of them, so conceivably you might
>     want to override just one? That's probably over-engineering, though.

I viewed this to be working at the more conceptual "here is the file
to read 'system' (or 'per-user') stuff from" level, and not at the
level of the individual file, as I consider that it is a mere
implementation detail that 'per-user' may read from multiple files.

>   - if we have config for "read from this file instead of the system
>     config" and "read from this instead of the user-level config", then
>     I wonder if people will want "read this instead of the repo config".
>     We have resisted having GIT_CONFIG mean that for many years, because
>     I think it gets awkward in some cases (e.g., we'd still want to read
>     it for core.repositoryformatversion, etc). I'm OK with drawing the
>     line there and saying it's not a support feature, but we should be
>     prepared to explain it to users (in the docs or at least in the
>     commit message adding the system/global override variables).

We may have to bite the bullet and make an official catalog of
really "structurely fundamental" configuration variables that must
appear in the per-repository file, and a mechanism to enforce that
by always reading these variables from "$GIT_DIR/config" and always
ignoring appearances of them in any other places.

That alone would probably be a good thing to do regardless of the
GIT_CONFIG_NOGLOBAL issue, as I suspect you may be able to wreak
havoc by adding random configuration like [extension] in
$HOME/.gitconfig ;-)

With that, it would make sense to allow overriding the per-repo
configuration in a similar way, only as a mechanism to override
configuration variables that are about "preferences" (as opposed to
the structurally fundamental ones).

  reply index

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 14:17 Patrick Steinhardt
2021-04-08 16:44 ` Eric Sunshine
2021-04-08 17:25 ` Junio C Hamano
2021-04-08 23:18   ` Jeff King
2021-04-08 23:43     ` Junio C Hamano [this message]
2021-04-09  0:25       ` Jeff King
2021-04-08 23:34   ` Ævar Arnfjörð Bjarmason
2021-04-08 23:39   ` Ævar Arnfjörð Bjarmason
2021-04-08 23:30 ` Ævar Arnfjörð Bjarmason
2021-04-08 23:56   ` Junio C Hamano
2021-04-09 13:43 ` [PATCH v2 0/3] config: allow overriding global/system config Patrick Steinhardt
2021-04-09 13:43   ` [PATCH v2 1/3] config: rename `git_etc_config()` Patrick Steinhardt
2021-04-09 15:13     ` Jeff King
2021-04-09 13:43   ` [PATCH v2 2/3] config: unify code paths to get global config paths Patrick Steinhardt
2021-04-09 15:21     ` Jeff King
2021-04-09 13:43   ` [PATCH v2 3/3] config: allow overriding of global and system configuration Patrick Steinhardt
2021-04-09 15:38     ` Jeff King
2021-04-12 14:04       ` Patrick Steinhardt
2021-04-09 22:18     ` Junio C Hamano
2021-04-09 15:41   ` [PATCH v2 0/3] config: allow overriding global/system config Jeff King
2021-04-12 14:46   ` [PATCH v3 " Patrick Steinhardt
2021-04-12 14:46     ` [PATCH v3 1/3] config: rename `git_etc_config()` Patrick Steinhardt
2021-04-12 14:46     ` [PATCH v3 2/3] config: unify code paths to get global config paths Patrick Steinhardt
2021-04-12 14:46     ` [PATCH v3 3/3] config: allow overriding of global and system configuration Patrick Steinhardt
2021-04-12 17:04       ` Junio C Hamano
2021-04-13  7:11     ` [PATCH v4 0/3] config: allow overriding global/system config Patrick Steinhardt
2021-04-13  7:11       ` [PATCH v4 1/3] config: rename `git_etc_config()` Patrick Steinhardt
2021-04-13  7:25         ` Jeff King
2021-04-16 21:14         ` SZEDER Gábor
2021-04-17  8:44           ` Jeff King
2021-04-17 21:37             ` Junio C Hamano
2021-04-18  5:39               ` Jeff King
2021-04-19 11:03                 ` Patrick Steinhardt
2021-04-23  9:27                   ` Jeff King
2021-04-13  7:11       ` [PATCH v4 2/3] config: unify code paths to get global config paths Patrick Steinhardt
2021-04-13  7:11       ` [PATCH v4 3/3] config: allow overriding of global and system configuration Patrick Steinhardt
2021-04-13  7:33         ` Jeff King
2021-04-13  7:54           ` Patrick Steinhardt
2021-04-13  7:33       ` [PATCH v4 0/3] config: allow overriding global/system config Jeff King
2021-04-13 17:49       ` Junio C Hamano
2021-04-14  5:37         ` Patrick Steinhardt
2021-04-19 12:31       ` [PATCH v5 " Patrick Steinhardt
2021-04-19 12:31         ` [PATCH v5 1/3] config: rename `git_etc_config()` Patrick Steinhardt
2021-04-19 12:31         ` [PATCH v5 2/3] config: unify code paths to get global config paths Patrick Steinhardt
2021-04-19 12:31         ` [PATCH v5 3/3] config: allow overriding of global and system configuration Patrick Steinhardt
2021-04-21 20:46           ` SZEDER Gábor
2021-04-21 21:06             ` SZEDER Gábor
2021-04-22  5:36               ` Patrick Steinhardt
2021-04-23  5:47             ` [PATCH] t1300: fix unset of GIT_CONFIG_NOSYSTEM leaking into subsequent tests Patrick Steinhardt
2021-04-19 21:55         ` [PATCH v5 0/3] config: allow overriding global/system config Junio C Hamano
2021-04-23  9:32         ` Jeff King
2021-04-12 14:46 ` [PATCH v3] config: allow overriding of global and system configuration Patrick Steinhardt

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