git@vger.kernel.org list mirror (unofficial, one of many)
 help / color / mirror / Atom feed
From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Patrick Steinhardt <ps@pks.im>, git@vger.kernel.org
Subject: Re: [PATCH 2/2] config: allow specifying config entries via envvar pairs
Date: Tue, 17 Nov 2020 15:03:32 +0100
Message-ID: <875z64f5cb.fsf@evledraar.gmail.com> (raw)
In-Reply-To: <xmqqy2j1851k.fsf@gitster.c.googlers.com>


On Mon, Nov 16 2020, Junio C Hamano wrote:

> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
>
>> On Fri, Nov 13 2020, Patrick Steinhardt wrote:
>>
>>> While not document, it is currently possible to specify config entries
>>
>> "While not documented..."
>>
>>> +		strbuf_addf(&envvar, "GIT_CONFIG_KEY_%d", i);
>>> +		if ((key = getenv(envvar.buf)) == NULL)
>>> +			break;
>>
>> The convention in git.git is to avoid explicit NULL checks. So maybe
>> something like this, which also avoids the assignment inside an "if"
>>
>>     key = getenv(envvar.buf);
>>     if (!key)
>>         break;
>
> All good suggestions, but...
>
> "While not documented" yes, for sure, but we do not document it for
> a good reason---it is a pure implementation detail between Git
> process that runs another one as its internal implementation detail.

*nod* I didn't mean it should be treated as some API, just "it happens
 to work". I do agree with Jeff downthread that it would be nice to have
 it explicitly supported.

> I especially do not think we want to read from unbounded number of
> GIT_CONFIG_KEY_<N> variables like this patch does.  How would a
> script cleanse its environment to protect itself from stray such
> environment variable pair?  Count up from 1 to forever?  Run "env"
> and grep for "GIT_CONFIG_KEY_[0-9]*=" (the answer is No.  What if
> some environment variables have newline in its values?)

Purely on an implementation note, if we went that route we could provide
something based on compat/unsetenv.c (or environ iteration in general)
that would loop over the env, but I agree it would be better to make
GIT_CONFIG_PARAMETERS nice.

  parent reply	other threads:[~2020-11-17 14:06 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
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 [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://vger.kernel.org/majordomo-info.html

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=875z64f5cb.fsf@evledraar.gmail.com \
    --to=avarab@gmail.com \
    --cc=git@vger.kernel.org \
    --cc=gitster@pobox.com \
    --cc=ps@pks.im \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

git@vger.kernel.org list mirror (unofficial, one of many)

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://public-inbox.org/git
	git clone --mirror http://ou63pmih66umazou.onion/git
	git clone --mirror http://czquwvybam4bgbro.onion/git
	git clone --mirror http://hjrcffqmbrq6wope.onion/git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V1 git git/ https://public-inbox.org/git \
		git@vger.kernel.org
	public-inbox-index git

Example config snippet for mirrors.
Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.version-control.git
	nntp://ou63pmih66umazou.onion/inbox.comp.version-control.git
	nntp://czquwvybam4bgbro.onion/inbox.comp.version-control.git
	nntp://hjrcffqmbrq6wope.onion/inbox.comp.version-control.git
	nntp://news.gmane.io/gmane.comp.version-control.git
 note: .onion URLs require Tor: https://www.torproject.org/

code repositories for the project(s) associated with this inbox:

	https://80x24.org/mirrors/git.git

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git