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From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>,
	git@vger.kernel.org, "Denton Liu" <liu.denton@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [PATCH v2 8/8] tests: disallow the use of abbreviated options (by default)
Date: Mon, 15 Apr 2019 15:08:05 +0200 (CEST)
Message-ID: <nycvar.QRO.7.76.6.1904151503390.44@tvgsbejvaqbjf.bet> (raw)
In-Reply-To: <xmqqv9zhwbxt.fsf@gitster-ct.c.googlers.com>

[-- Attachment #1: Type: text/plain, Size: 3196 bytes --]

Hi Junio,

On Sun, 14 Apr 2019, Junio C Hamano wrote:

> "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
> writes:
>
> > diff --git a/t/test-lib.sh b/t/test-lib.sh
> > index 562c57e685..f1a0fea4e1 100644
> > --- a/t/test-lib.sh
> > +++ b/t/test-lib.sh
> > @@ -57,6 +57,13 @@ fi
> >  . "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
> >  export PERL_PATH SHELL_PATH
> >
> > +# Disallow the use of abbreviated options in the test suite by default
> > +if test -n "${GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS:+isset}"
> > +then
> > +	GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=true
> > +	export GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS
> > +fi
>
> If the original environment has it as flase, as it is set, the
> substitution will yield "isset" which is not an empty string, so we
> assign true.
>
> If the original environment is not set, or set to an empty, however,
> the substitution will yield an empty string, so we won't touch the
> variable.
>
> I am not sure in what situation the above behaviour becomes useful.
>
> Do you mean more like
>
> 	if test -z "$GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS"
> 	then
> 		... assignment ...
> 	fi

Ævar rightfully pointed out that I introduced a new paradigm, so I
switched to imitating the exact way `test-lib.sh` handles similar cases.
Which is the `isset` method.

Sure, I could do something differently, like `test -z`. But why? I think
it is better to stay consistent with the existing checks.

> IOW, we'll take an explicit GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=false
> as a sign that the developer for whatever readon wants the disambiguation
> code in parse-options to kick in for all uses and allow a shortened option
> names?

Yes.

Let's assume that there is a developer, or even a team (think e.g. VFS for
Git), working on some long-running features that should be eventually
contributed to Git, but that are still in flux, and through a merge with
the current Git version, they get this change, and it breaks 50 of their
test scripts.

This is the scenario I wanted to help, however unlikely that is ;-)

Of course, eventually they'd want to fix their test scripts. But maybe
right now is not such a great time, so let's let them override the
new behavior.

> If on the other hand you are protecting our tests against those
> who casually have the environment set to false, because they know
> some of the scripts they use are sloppy *and* for whatever reason
> they anticipate that someday we will start to disallow abbrevated
> options by default?  If so, an unconditional assignment of true
> would be more appropriate.
>
> I think I can agree with either of the two positions (i.e. we let
> those who explicitly want to decline do so, or we unconditionally
> make sure we catch issues in our tests), and I do not think of a
> third position that are different from these two and that would make
> sense.  Between the two, I'd probably vote for the latter if I was
> pressed, but even then that is not a very strong preference.
>
> Thanks.  I very much like the premise of this series, and the above
> hunk stood out in the range-diff in 0/8.

Thank you!
Dscho

      parent reply	other threads:[~2019-04-15 13:08 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-25 18:14 [PATCH 0/8] Do not use abbreviated options in tests Johannes Schindelin via GitGitGadget
2019-03-25 18:14 ` [PATCH 1/8] tests (rebase): spell out the `--keep-empty` option Johannes Schindelin via GitGitGadget
2019-03-25 18:14 ` [PATCH 2/8] tests (rebase): spell out the `--force-rebase` option Johannes Schindelin via GitGitGadget
2019-03-25 18:14 ` [PATCH 3/8] t7810: do not abbreviate `--no-exclude-standard` nor `--invert-match` Johannes Schindelin via GitGitGadget
2019-03-25 18:14 ` [PATCH 4/8] t5531: avoid using an abbreviated option Johannes Schindelin via GitGitGadget
2019-03-25 18:14 ` [PATCH 5/8] tests (push): do not abbreviate the `--follow-tags` option Johannes Schindelin via GitGitGadget
2019-03-25 18:14 ` [PATCH 6/8] tests (status): spell out the `--find-renames` option in full Johannes Schindelin via GitGitGadget
2019-03-25 18:14 ` [PATCH 8/8] tests: disallow the use of abbreviated options (by default) Johannes Schindelin via GitGitGadget
2019-03-25 18:35   ` Denton Liu
2019-03-25 20:26     ` Ævar Arnfjörð Bjarmason
2019-04-12  8:48       ` Johannes Schindelin
2019-04-12  8:50     ` Johannes Schindelin
2019-03-25 19:47   ` Ævar Arnfjörð Bjarmason
2019-04-12  8:59     ` Johannes Schindelin
2019-03-25 18:14 ` [PATCH 7/8] tests (pack-objects): use the full, unabbreviated `--revs` option Johannes Schindelin via GitGitGadget
2019-03-25 20:23 ` [PATCH 0/2] allow for configuring option abbreviation + fix Ævar Arnfjörð Bjarmason
2019-03-25 20:23 ` [PATCH 1/2] parse-options: allow for configuring option abbreviation Ævar Arnfjörð Bjarmason
2019-03-25 21:23   ` Eric Sunshine
2019-03-25 22:47     ` Ævar Arnfjörð Bjarmason
2019-03-26  4:14       ` Duy Nguyen
2019-03-26  6:28         ` Ævar Arnfjörð Bjarmason
2019-03-26  7:13           ` Duy Nguyen
2019-03-26 11:00             ` Ævar Arnfjörð Bjarmason
2019-04-01 10:47     ` Junio C Hamano
2019-04-12  9:06       ` Johannes Schindelin
2019-03-25 20:23 ` [PATCH 2/2] parse-options: don't emit "ambiguous option" for aliases Ævar Arnfjörð Bjarmason
2019-04-17 12:44   ` [PATCH v2] " Ævar Arnfjörð Bjarmason
2019-04-17 16:04     ` Duy Nguyen
2019-04-18  0:48       ` Junio C Hamano
2019-04-18  9:29         ` Duy Nguyen
2019-04-19  4:39           ` Junio C Hamano
2019-04-22 12:22             ` [PATCH] " Nguyễn Thái Ngọc Duy
2019-04-22 12:34               ` Duy Nguyen
2019-04-29 10:05               ` [PATCH v2] " Nguyễn Thái Ngọc Duy
2019-05-07  3:43                 ` Junio C Hamano
2019-05-07 11:58                   ` Duy Nguyen
2019-04-02  0:58 ` [PATCH 0/8] Do not use abbreviated options in tests Junio C Hamano
2019-04-12  9:37 ` [PATCH v2 " Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 1/8] tests (rebase): spell out the `--keep-empty` option Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 2/8] tests (rebase): spell out the `--force-rebase` option Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 3/8] t7810: do not abbreviate `--no-exclude-standard` nor `--invert-match` Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 4/8] t5531: avoid using an abbreviated option Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 5/8] tests (push): do not abbreviate the `--follow-tags` option Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 7/8] tests (pack-objects): use the full, unabbreviated `--revs` option Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 6/8] tests (status): spell out the `--find-renames` option in full Johannes Schindelin via GitGitGadget
2019-04-12  9:37   ` [PATCH v2 8/8] tests: disallow the use of abbreviated options (by default) Johannes Schindelin via GitGitGadget
2019-04-14  2:35     ` Junio C Hamano
2019-04-15  2:55       ` Junio C Hamano
2019-04-15 13:09         ` Johannes Schindelin
2019-04-15 13:45           ` Junio C Hamano
2019-04-17 12:07             ` Johannes Schindelin
2019-04-15 13:08       ` Johannes Schindelin [this message]

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