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From: Patrick Steinhardt <ps@pks.im>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org, "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Jeff King" <peff@peff.net>,
	"brian m. carlson" <sandals@crustytoothpaste.net>,
	"Philip Oakley" <philipoakley@iee.email>
Subject: Re: [PATCH v2 2/2] config: allow specifying config entries via envvar pairs
Date: Wed, 25 Nov 2020 08:06:50 +0100
Message-ID: <X74CigYS7AUtMo9Q@tanuki> (raw)
In-Reply-To: <xmqqtutef6kb.fsf@gitster.c.googlers.com>


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On Tue, Nov 24, 2020 at 07:39:48PM -0800, Junio C Hamano wrote:
> Patrick Steinhardt <ps@pks.im> writes:
> 
> > +GIT_CONFIG_COUNT,GIT_CONFIG_KEY_<n>,GIT_CONFIG_VALUE_<n>::
> 
> I think we write a header with multiple/related items like this
> instead:
> 
>     GIT_CONFIG_COUNT::
>     GIT_CONFIG_KEY_<n>::
>     GIT_CONFIG_VALUE_<n>::
> 
> See how -f/--file is marked up in an earlier part of the same file.

Ah, thanks. I wondered how to format these but didn't spot other
examples.

> > +	If GIT_CONFIG_COUNT is set to a positive number, all environment pairs
> > +	GIT_CONFIG_KEY_<n> and GIT_CONFIG_VALUE_<n> up to that number will be
> > +	added to the process's runtime configuration. The config pairs are
> > +	zero-indexed. Any missing key or value is treated as an error. An empty
> > +	GIT_CONFIG_COUNT is treated the same as GIT_CONFIG_COUNT=0, namely no
> > +	pairs are processed. Config entries set this way have command scope,
> > +	but will be overridden by any explicit options passed via `git -c`.
> > +
> >  See also <<FILES>>.
> 
> Doesn't this <<FILES>> refer to GIT_CONFIG and GIT_CONFIG_NOSYSTEM
> that are described earlier?  It certainly looks out of place to see
> it after the KEY/VALUE thing.

Right, my fault.

> > +		for (i = 0; i < count; i++) {
> > +			const char *key, *value;
> > +
> > +			strbuf_addf(&envvar, "GIT_CONFIG_KEY_%d", i);
> > +			key = getenv(envvar.buf);
> > +			if (!key) {
> > +				ret = error(_("missing config key %s"), envvar.buf);
> > +				goto out;
> > +			}
> > +			strbuf_reset(&envvar);
> > +
> > +			strbuf_addf(&envvar, "GIT_CONFIG_VALUE_%d", i);
> > +			value = getenv(envvar.buf);
> > +			if (!value) {
> > +				ret = error(_("missing config value %s"), envvar.buf);
> > +				goto out;
> > +			}
> > +			strbuf_reset(&envvar);
> 
> Didn't we got bitten by number of times that the string returned by
> getenv() are not necessarily nonvolatile depending on platforms?  I
> think the result of getenv() would need to be xstrdup'ed.
> 
> cf. 6776a84d (diff: ensure correct lifetime of external_diff_cmd,
> 2019-01-11)

We did, but do we have to in this case? There is no interleaving calls
to getenv(3P), so we don't depend on at least $n getenv(3P) calls
succeeding without clobbering old values. It's true that it could be
that any other caller in the callchain clobbers the value, but as far as
I can see none does.

Anyway, I'm not opposed to changing this if you think it to be
necessary.

> > +			if (config_parse_pair(key, value, fn, data) < 0) {
> > +				ret = -1;
> > +				goto out;
> > +			}
> > +		}
> >  	}
> >  
> > -	for (i = 0; i < nr; i++) {
> > -		if (git_config_parse_parameter(argv[i], fn, data) < 0) {
> > -			ret = -1;
> > +	env = getenv(CONFIG_DATA_ENVIRONMENT);
> 
> > +	if (env) {
> > +		int nr = 0, alloc = 0;
> > +
> > +		/* sq_dequote will write over it */
> > +		envw = xstrdup(env);
> > +
> > +		if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
> > +			ret = error(_("bogus format in %s"), CONFIG_DATA_ENVIRONMENT);
> >  			goto out;
> >  		}
> > +
> > +		for (i = 0; i < nr; i++) {
> > +			if (git_config_parse_parameter(argv[i], fn, data) < 0) {
> > +				ret = -1;
> > +				goto out;
> > +			}
> > +		}
> >  	}
> >  
> >  out:
> > +	strbuf_release(&envvar);
> >  	free(argv);
> >  	free(envw);
> >  	cf = source.prev;
> 
> With re-indentation this patch does, it is a bit hard to see the
> correspondence between common lines in preimage and postimage, but I
> think the patch adds the support of the new style environments
> before the existing support of the GIT_CONFIG_DATA, but when there
> is no compelling reason not to, new code should be added near the
> bottom, not before the existing code, in the function.
> 
> Otherwise, this part of the patch looks OK to me.
> 
> Thanks.

It is required as this is what sets precedence of GIT_CONFIG_PARAMETERS
and thus `git -c` over GIT_CONFIG_COUNT. It's easy enough to split this
into two patches though, with a first refactoring which does the
indentation and a second one which adds the new code.

Patrick

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  reply index

Thread overview: 116+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-24 10:50 [PATCH v2 0/2] " Patrick Steinhardt
2020-11-24 10:50 ` [PATCH v2 1/2] config: extract function to parse config pairs Patrick Steinhardt
2020-11-24 10:50 ` [PATCH v2 2/2] config: allow specifying config entries via envvar pairs Patrick Steinhardt
2020-11-25  3:39   ` Junio C Hamano
2020-11-25  7:06     ` Patrick Steinhardt [this message]
2020-11-25  7:41       ` Junio C Hamano
2020-11-25  7:57         ` Patrick Steinhardt
2020-11-25  8:47   ` Ævar Arnfjörð Bjarmason
2020-11-25  9:00   ` Ævar Arnfjörð Bjarmason
2020-11-25 19:50     ` Junio C Hamano
2020-11-25 10:41 ` [PATCH v2 0/2] " Jeff King
2020-11-25 13:16   ` Patrick Steinhardt
2020-11-26  0:36     ` Jeff King
2020-11-25 20:28   ` Junio C Hamano
2020-11-25 22:47   ` brian m. carlson
2020-11-26  6:31     ` Patrick Steinhardt
2020-12-01  9:47   ` Patrick Steinhardt
2020-12-01 11:30     ` Jeff King
2020-12-01  9:55 ` [PATCH v3 0/4] " Patrick Steinhardt
2020-12-01  9:55   ` [PATCH v3 1/4] environment: make `getenv_safe()` non-static Patrick Steinhardt
2020-12-01  9:56   ` [PATCH v3 2/4] config: extract function to parse config pairs Patrick Steinhardt
2020-12-01  9:56   ` [PATCH v3 3/4] config: refactor parsing of GIT_CONFIG_PARAMETERS Patrick Steinhardt
2020-12-01  9:56   ` [PATCH v3 4/4] config: allow specifying config entries via envvar pairs Patrick Steinhardt
2020-12-09 11:52 ` [PATCH v4 0/6] config: allow specifying config entries via env Patrick Steinhardt
2020-12-09 11:52   ` [PATCH v4 1/6] git: add `--super-prefix` to usage string Patrick Steinhardt
2020-12-09 11:52   ` [PATCH v4 2/6] config: add new way to pass config via `--config-env` Patrick Steinhardt
2020-12-09 14:40     ` Ævar Arnfjörð Bjarmason
2020-12-09 16:24       ` Jeff King
2020-12-11 13:24         ` Patrick Steinhardt
2020-12-11 14:21           ` Jeff King
2020-12-11 14:54             ` Patrick Steinhardt
2020-12-11 16:10               ` Jeff King
2020-12-09 16:10     ` Jeff King
2020-12-09 16:12       ` [PATCH 1/3] quote: make sq_dequote_step() a public function Jeff King
2020-12-09 16:17       ` [PATCH 2/3] config: parse more robust format in GIT_CONFIG_PARAMETERS Jeff King
2020-12-09 16:20       ` [PATCH 3/3] config: store "git -c" variables using more robust format Jeff King
2020-12-09 16:34         ` Jeff King
2020-12-10 20:55         ` Ævar Arnfjörð Bjarmason
2020-12-10 21:49           ` Junio C Hamano
2020-12-11 13:21           ` Jeff King
2020-12-10  0:00       ` [PATCH v4 2/6] config: add new way to pass config via `--config-env` Junio C Hamano
2020-12-10  0:09         ` Jeff King
2020-12-10  0:57           ` Junio C Hamano
2020-12-11 13:24       ` Patrick Steinhardt
2020-12-11 14:20         ` Jeff King
2020-12-09 11:52   ` [PATCH v4 3/6] environment: make `getenv_safe()` non-static Patrick Steinhardt
2020-12-09 11:52   ` [PATCH v4 4/6] config: extract function to parse config pairs Patrick Steinhardt
2020-12-09 13:12     ` Ævar Arnfjörð Bjarmason
2020-12-09 11:52   ` [PATCH v4 5/6] config: refactor parsing of GIT_CONFIG_PARAMETERS Patrick Steinhardt
2020-12-09 11:52   ` [PATCH v4 6/6] config: allow specifying config entries via envvar pairs Patrick Steinhardt
2020-12-09 15:29   ` [PATCH v4 0/6] config: allow specifying config entries via env Ævar Arnfjörð Bjarmason
2020-12-11 13:35     ` Patrick Steinhardt
2020-12-11 14:27       ` Jeff King
2020-12-11 14:42         ` Jeff King
2020-12-11 14:58           ` Patrick Steinhardt
2020-12-11 14:47         ` Patrick Steinhardt
2020-12-11 15:21           ` Ævar Arnfjörð Bjarmason
2020-12-11 16:02           ` Jeff King
2020-12-16  7:52 ` [PATCH v5 0/8] " Patrick Steinhardt
2020-12-16  7:52   ` [PATCH v5 1/8] git: add `--super-prefix` to usage string Patrick Steinhardt
2020-12-16  7:52   ` [PATCH v5 2/8] config: add new way to pass config via `--config-env` Patrick Steinhardt
2020-12-23 21:35     ` Junio C Hamano
2020-12-16  7:54   ` [PATCH v5 4/8] config: extract function to parse config pairs Patrick Steinhardt
2020-12-16  7:54   ` [PATCH v5 7/8] environment: make `getenv_safe()` a public function Patrick Steinhardt
2020-12-16  7:54   ` [PATCH v5 8/8] config: allow specifying config entries via envvar pairs Patrick Steinhardt
2020-12-23 21:14     ` Junio C Hamano
2020-12-23 21:55       ` Junio C Hamano
2021-01-06 10:28         ` Patrick Steinhardt
2021-01-06 21:07           ` Junio C Hamano
2020-12-16  7:56   ` [PATCH v5 3/8] quote: make sq_dequote_step() a public function Patrick Steinhardt
2020-12-16  7:56   ` [PATCH v5 5/8] config: store "git -c" variables using more robust format Patrick Steinhardt
2020-12-16  7:57   ` [PATCH v5 6/8] config: parse more robust format in GIT_CONFIG_PARAMETERS Patrick Steinhardt
2020-12-16 20:01     ` Phillip Wood
2021-01-07  6:36 ` [PATCH v6 0/8] config: allow specifying config entries via env Patrick Steinhardt
2021-01-07  6:36   ` [PATCH v6 1/8] git: add `--super-prefix` to usage string Patrick Steinhardt
2021-01-07  6:36   ` [PATCH v6 2/8] config: add new way to pass config via `--config-env` Patrick Steinhardt
2021-01-10 20:29     ` Simon Ruderich
2021-01-11  0:29       ` Junio C Hamano
2021-01-11  8:24         ` Patrick Steinhardt
2021-01-07  6:36   ` [PATCH v6 3/8] quote: make sq_dequote_step() a public function Patrick Steinhardt
2021-01-07  6:37   ` [PATCH v6 4/8] config: extract function to parse config pairs Patrick Steinhardt
2021-01-07  6:37   ` [PATCH v6 5/8] config: store "git -c" variables using more robust format Patrick Steinhardt
2021-01-07  6:37   ` [PATCH v6 6/8] config: parse more robust format in GIT_CONFIG_PARAMETERS Patrick Steinhardt
2021-01-07  6:37   ` [PATCH v6 7/8] environment: make `getenv_safe()` a public function Patrick Steinhardt
2021-01-07  6:37   ` [PATCH v6 8/8] config: allow specifying config entries via envvar pairs Patrick Steinhardt
2021-01-11  8:36 ` [PATCH v7 0/8] " Patrick Steinhardt
2021-01-11  8:36   ` [PATCH v7 1/8] git: add `--super-prefix` to usage string Patrick Steinhardt
2021-01-11  8:36   ` [PATCH v7 2/8] config: add new way to pass config via `--config-env` Patrick Steinhardt
2021-01-11 22:34     ` Junio C Hamano
2021-01-11  8:36   ` [PATCH v7 3/8] quote: make sq_dequote_step() a public function Patrick Steinhardt
2021-01-11  8:36   ` [PATCH v7 4/8] config: extract function to parse config pairs Patrick Steinhardt
2021-01-11  8:37   ` [PATCH v7 5/8] config: store "git -c" variables using more robust format Patrick Steinhardt
2021-01-11  8:37   ` [PATCH v7 6/8] config: parse more robust format in GIT_CONFIG_PARAMETERS Patrick Steinhardt
2021-01-11  8:37   ` [PATCH v7 7/8] environment: make `getenv_safe()` a public function Patrick Steinhardt
2021-01-11  8:37   ` [PATCH v7 8/8] config: allow specifying config entries via envvar pairs Patrick Steinhardt
2021-01-12 12:26 ` [PATCH v8 0/8] " Patrick Steinhardt
2021-01-12 12:26   ` [PATCH v8 1/8] git: add `--super-prefix` to usage string Patrick Steinhardt
2021-01-12 12:26   ` [PATCH v8 2/8] config: add new way to pass config via `--config-env` Patrick Steinhardt
2021-04-16 15:40     ` Ævar Arnfjörð Bjarmason
2021-04-17  8:38       ` Jeff King
2021-04-19 15:28         ` Patrick Steinhardt
2021-04-20 11:01           ` Ævar Arnfjörð Bjarmason
2021-04-20 10:59         ` Ævar Arnfjörð Bjarmason
2021-04-23 10:05           ` Jeff King
2021-05-19 11:36             ` Ævar Arnfjörð Bjarmason
2021-01-12 12:26   ` [PATCH v8 3/8] quote: make sq_dequote_step() a public function Patrick Steinhardt
2021-01-12 12:26   ` [PATCH v8 4/8] config: extract function to parse config pairs Patrick Steinhardt
2021-01-12 12:27   ` [PATCH v8 5/8] config: store "git -c" variables using more robust format Patrick Steinhardt
2021-01-15 19:16     ` Jeff King
2021-01-20  6:29       ` Patrick Steinhardt
2021-01-20  6:55         ` Junio C Hamano
2021-01-20  7:42           ` Patrick Steinhardt
2021-01-20 22:28             ` Junio C Hamano
2021-01-12 12:27   ` [PATCH v8 6/8] config: parse more robust format in GIT_CONFIG_PARAMETERS Patrick Steinhardt
2021-01-12 12:27   ` [PATCH v8 7/8] environment: make `getenv_safe()` a public function Patrick Steinhardt
2021-01-12 12:27   ` [PATCH v8 8/8] config: allow specifying config entries via envvar pairs Patrick Steinhardt

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