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From: Junio C Hamano <gitster@pobox.com>
To: Patrick Steinhardt <ps@pks.im>
Cc: git@vger.kernel.org, "Jeff King" <peff@peff.net>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Eric Sunshine" <sunshine@sunshineco.com>
Subject: Re: [PATCH v2 3/3] config: allow overriding of global and system configuration
Date: Fri, 09 Apr 2021 15:18:48 -0700
Message-ID: <xmqqo8enm793.fsf@gitster.g> (raw)
In-Reply-To: <272a3b31aa73da8d65b04e647b1b9ca860f4e783.1617975637.git.ps@pks.im> (Patrick Steinhardt's message of "Fri, 9 Apr 2021 15:43:30 +0200")

Patrick Steinhardt <ps@pks.im> writes:

> diff --git a/config.c b/config.c
> index 6af0244085..9dfc4a79f7 100644
> --- a/config.c
> +++ b/config.c
> @@ -1847,8 +1847,22 @@ static int git_config_from_blob_ref(config_fn_t fn,
>  const char *git_system_config(void)
>  {
>  	static const char *system_wide;
> -	if (!system_wide)
> -		system_wide = system_path(ETC_GITCONFIG);
> +
> +	if (!system_wide) {
> +		system_wide = xstrdup_or_null(getenv("GIT_CONFIG_SYSTEM"));
> +		if (system_wide) {
> +			/*
> +			 * If GIT_CONFIG_SYSTEM is set, it overrides the
> +			 * /etc/gitconfig. Furthermore, the file must exist in
> +			 * order to prevent any typos by the user.
> +			 */
> +			if (access(system_wide, R_OK))
> +				die(_("cannot access '%s'"), system_wide);
> +		} else {
> +			system_wide = system_path(ETC_GITCONFIG);
> +		}
> +	}
> +
>  	return system_wide;
>  }

I wrote the design to truly special case "/dev/null" at the pathname
string level, and we do not even try to open/read from a file when
"/dev/null" is given, so that we can even allow "/dev/null" to be
missing in a funny embedded or containerized environment, but that
does not seem to be what is going on here.

I do not think "access()" here is a good idea; the result we get
here may not match what happens when we actually try to open the
path.  Just remembering if we got the system_wide value from the
GIT_CONFIG_SYSTEM, and change what happens when the open fails when
we try to use the system-wide configuration depending on that, would
be the right approach.

  parent reply index

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 14:17 [PATCH] config: Introduce GIT_CONFIG_NOGLOBAL 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
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 [this message]
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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