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 08:57:34 +0100 [thread overview]
Message-ID: <X74OblVAeE7PVJOP@tanuki> (raw)
In-Reply-To: <xmqqpn41g9xt.fsf@gitster.c.googlers.com>
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On Tue, Nov 24, 2020 at 11:41:34PM -0800, Junio C Hamano wrote:
> Patrick Steinhardt <ps@pks.im> writes:
> >> > + 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.
>
> Doesn't the code expect "key" will stay valid even after another
> call to getenv() grabs "value"?
Oh, right. No idea what I was thinking there.
> > It is required as this is what sets precedence of GIT_CONFIG_PARAMETERS
> > and thus `git -c` over GIT_CONFIG_COUNT.
>
> OK, that is what the "will be overridden by any explicit options"
> was about. Perhaps that deserves an in-code comment, something like
>
> /*
> * process GIT_CONFIG_KEY_N/GIT_CONFIG_VALUE_N pairs
> * first, to be overridden by GIT_CONFIG_PARAMETERS
> * inherited from parent Git processes' "git -c var=val"
> * later
> */
>
> before we check GIT_CONFIG_COUNT and loop over the new style
> environment variables.
>
> Thanks.
Will do, thanks!
Patrick
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next prev parent reply other threads:[~2020-11-25 7:57 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 10:50 [PATCH v2 0/2] config: allow specifying config entries via envvar pairs 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
2020-11-25 7:41 ` Junio C Hamano
2020-11-25 7:57 ` Patrick Steinhardt [this message]
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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