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From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: Duy Nguyen <pclouds@gmail.com>
Cc: "Jeff King" <peff@peff.net>, "Stefan Beller" <sbeller@google.com>,
	git <git@vger.kernel.org>, "Junio C Hamano" <gitster@pobox.com>,
	"Thomas Rast" <tr@thomasrast.ch>,
	"Phil Haack" <haacked@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Jason Frey" <jfrey@redhat.com>,
	"Philip Oakley" <philipoakley@iee.org>
Subject: Re: [PATCH 1/9] git_config_set: fix off-by-two
Date: Fri, 30 Mar 2018 20:53:41 +0200 (DST)	[thread overview]
Message-ID: <nycvar.QRO.7.76.6.1803302046550.5026@qfpub.tvgsbejvaqbjf.bet> (raw)
In-Reply-To: <CACsJy8DPof1jFe_cOS5+5dRHehU+_Y9y86P+5f3s_C0u85BXBw@mail.gmail.com>

Hi Duy,

On Fri, 30 Mar 2018, Duy Nguyen wrote:

> On Fri, Mar 30, 2018 at 2:32 PM, Johannes Schindelin
> <Johannes.Schindelin@gmx.de> wrote:
> >
> > On Thu, 29 Mar 2018, Jeff King wrote:
> >
> >> On Thu, Mar 29, 2018 at 11:15:33AM -0700, Stefan Beller wrote:
> >>
> >> > > When calling `git config --unset abc.a` on this file, it leaves this
> >> > > (invalid) config behind:
> >> > >
> >> > >         [
> >> > >         [xyz]
> >> > >                 key = value
> >> > >
> >> > > The reason is that we try to search for the beginning of the line (or
> >> > > for the end of the preceding section header on the same line) that
> >> > > defines abc.a, but as an optimization, we subtract 2 from the offset
> >> > > pointing just after the definition before we call
> >> > > find_beginning_of_line(). That function, however, *also* performs that
> >> > > optimization and promptly fails to find the section header correctly.
> >> >
> >> > This commit message would be more convincing if we had it in test form.
> >>
> >> I agree a test might be nice. But I don't find the commit message
> >> unconvincing at all. It explains pretty clearly why the bug occurs, and
> >> you can verify it by looking at find_beginning_of_line.
> >>
> >> >     [abc]a
> >> >
> >> > is not written by Git, but would be written from an outside tool or person
> >> > and we barely cope with it?
> >>
> >> Yes, I don't think git would ever write onto the same line. But clearly
> >> we should handle anything that's syntactically valid.
> >
> > I was tempted to add the test case, because it is easy to test it.
> >
> > But I then decided *not* to add it. Why? Testing is a balance between "can
> > do" and "need to do".
> >
> > Can you imagine that I did *not* run the entire test suite before
> > submitting this patch series, because it takes an incredible *90 minutes*
> > to run *on a fast Windows machine*?
> 
> What's wrong with firing up a new worktree, run the test suite there
> and go back to do something else so you won't waste time just waiting
> for test results and submit? Sure there is a mental overhead for
> switching tasks, but at 90 minutes, I think it's worth doing.

Of course it is worth doing. That's why I often test the end result on
Windows (waiting those 90 minutes, but I do not fire up a new worktree, I
use my cloud privilege and let Azure/Visual Studio Team Services do the
work for me, without slowing down my laptop).

What I would love to do, however, would be to test all intermediate
patches, too, as that often shows a problem with my frequent reorderings
via interactive rebases. And 90 minutes times 9 is... 13 hours and 30
minutes. That's a really long time.

I think the best course of action would be to incrementally do away with
the shell scripted test framework, in the way you outlined earlier this
year. This would *also* buy us a wealth of other benefits, such as better
control over the parallelization, resource usage, etc.

It would also finally make it easier to introduce something like "smart
testing" where code coverage could be computed (this works only for C
code, of course, not for the many scripted parts of core Git), and a diff
could be inspected to discover which tests *really* need to be run,
skipping the tests that would only touch unchanged code.

Ciao,
Dscho

  reply	other threads:[~2018-03-30 18:54 UTC|newest]

Thread overview: 103+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-29 15:18 [PATCH 0/9] Assorted fixes for `git config` (including the "empty sections" bug) Johannes Schindelin
2018-03-29 15:18 ` [PATCH 1/9] git_config_set: fix off-by-two Johannes Schindelin
2018-03-29 18:15   ` Stefan Beller
2018-03-29 19:41     ` Jeff King
2018-03-30 12:32       ` Johannes Schindelin
2018-03-30 14:15         ` Ævar Arnfjörð Bjarmason
2018-03-30 16:24           ` Junio C Hamano
2018-03-30 18:44             ` Johannes Schindelin
2018-03-30 19:00               ` Junio C Hamano
2018-04-03  9:31                 ` Johannes Schindelin
2018-04-03 15:29                   ` Duy Nguyen
2018-04-03 15:47                     ` Johannes Schindelin
2018-04-08 23:12                   ` Junio C Hamano
2018-03-30 16:36         ` Duy Nguyen
2018-03-30 18:53           ` Johannes Schindelin [this message]
2018-03-30 19:16             ` Duy Nguyen
2018-03-30 18:45         ` A potential approach to making tests faster on Windows Ævar Arnfjörð Bjarmason
2018-03-30 18:58           ` Junio C Hamano
2018-03-30 19:16           ` Jeff King
2018-04-03  9:49             ` Johannes Schindelin
2018-04-03 11:28               ` Ævar Arnfjörð Bjarmason
2018-04-03 15:55                 ` Johannes Schindelin
2018-04-03 21:36               ` Eric Sunshine
2018-04-03 11:43           ` Johannes Schindelin
2018-04-03 13:27             ` Jeff King
2018-04-03 16:00               ` Johannes Schindelin
2018-04-06 21:40                 ` Jeff King
2018-04-06 21:57                   ` Stefan Beller
2018-03-29 15:18 ` [PATCH 2/9] t1300: rename it to reflect that `repo-config` was deprecated Johannes Schindelin
2018-03-29 19:42   ` Jeff King
2018-03-30 12:37     ` Johannes Schindelin
2018-03-29 15:18 ` [PATCH 3/9] t1300: avoid relying on a bug Johannes Schindelin
2018-03-29 19:43   ` Jeff King
2018-03-30 12:38     ` Johannes Schindelin
2018-03-29 15:18 ` [PATCH 4/9] t1300: remove unreasonable expectation from TODO Johannes Schindelin
2018-03-29 19:52   ` Jeff King
2018-03-29 20:45     ` Junio C Hamano
2018-03-30 12:42     ` Johannes Schindelin
2018-03-29 15:18 ` [PATCH 5/9] t1300: `--unset-all` can leave an empty section behind (bug) Johannes Schindelin
2018-03-29 19:54   ` Jeff King
2018-03-29 15:18 ` [PATCH 6/9] git_config_set: simplify the way the section name is remembered Johannes Schindelin
2018-03-29 15:19 ` [PATCH 7/9] git config --unset: remove empty sections (in normal situations) Johannes Schindelin
2018-03-29 21:32   ` Jeff King
2018-03-30 13:00     ` Johannes Schindelin
2018-03-30 13:09       ` Jeff King
2018-03-29 15:19 ` [PATCH 8/9] git_config_set: use do_config_from_file() directly Johannes Schindelin
2018-03-29 21:38   ` Jeff King
2018-03-30 13:02     ` Johannes Schindelin
2018-03-30 13:14       ` Jeff King
2018-03-30 14:01         ` Johannes Schindelin
2018-03-30 14:08           ` Jeff King
2018-03-30 19:04             ` Johannes Schindelin
2018-03-29 15:19 ` [PATCH 9/9] git_config_set: reuse empty sections Johannes Schindelin
2018-03-29 21:50   ` Jeff King
2018-03-30 13:15     ` Johannes Schindelin
2018-03-29 17:58 ` [PATCH 0/9] Assorted fixes for `git config` (including the "empty sections" bug) Stefan Beller
2018-03-30 12:14   ` Johannes Schindelin
2018-03-29 19:39 ` Jeff King
2018-03-30 12:35   ` Johannes Schindelin
2018-03-30 14:17 ` Ævar Arnfjörð Bjarmason
2018-03-30 18:46   ` Johannes Schindelin
2018-04-03 16:27 ` [PATCH v2 00/15] " Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 01/15] git_config_set: fix off-by-two Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 02/15] t1300: rename it to reflect that `repo-config` was deprecated Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 03/15] t1300: demonstrate that --replace-all can "invent" newlines Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 04/15] config --replace-all: avoid extra line breaks Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 05/15] t1300: avoid relying on a bug Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 06/15] t1300: remove unreasonable expectation from TODO Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 07/15] t1300: `--unset-all` can leave an empty section behind (bug) Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 08/15] config: introduce an optional event stream while parsing Johannes Schindelin
2018-04-06 21:22     ` Jeff King
2018-04-09  7:35       ` Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 09/15] config: avoid using the global variable `store` Johannes Schindelin
2018-04-06 21:23     ` Jeff King
2018-04-09  7:36       ` Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 10/15] config_set_store: rename some fields for consistency Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 11/15] git_config_set: do not use a state machine Johannes Schindelin
2018-04-06 21:28     ` Jeff King
2018-04-09  7:50       ` Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 12/15] git_config_set: make use of the config parser's event stream Johannes Schindelin
2018-04-03 16:28   ` [PATCH v2 13/15] git config --unset: remove empty sections (in the common case) Johannes Schindelin
2018-04-03 16:29   ` [PATCH v2 14/15] git_config_set: reuse empty sections Johannes Schindelin
2018-04-03 16:30   ` [PATCH v2 00/15] Assorted fixes for `git config` (including the "empty sections" bug) Johannes Schindelin
2018-04-06 21:33   ` Jeff King
2018-04-09  8:19     ` Johannes Schindelin
2018-04-09  8:31   ` [PATCH v3 " Johannes Schindelin
2018-04-09  8:31     ` [PATCH v3 01/15] git_config_set: fix off-by-two Johannes Schindelin
2018-04-09  8:31     ` [PATCH v3 02/15] t1300: rename it to reflect that `repo-config` was deprecated Johannes Schindelin
2018-04-09  8:31     ` [PATCH v3 03/15] t1300: demonstrate that --replace-all can "invent" newlines Johannes Schindelin
2018-04-09  8:31     ` [PATCH v3 04/15] config --replace-all: avoid extra line breaks Johannes Schindelin
2018-04-09  8:31     ` [PATCH v3 05/15] t1300: avoid relying on a bug Johannes Schindelin
2018-04-09  8:31     ` [PATCH v3 06/15] t1300: remove unreasonable expectation from TODO Johannes Schindelin
2018-04-09  8:31     ` [PATCH v3 07/15] t1300: add a few more hairy examples of sections becoming empty Johannes Schindelin
2018-04-09  8:32     ` [PATCH v3 08/15] t1300: `--unset-all` can leave an empty section behind (bug) Johannes Schindelin
2018-04-09  8:32     ` [PATCH v3 09/15] config: introduce an optional event stream while parsing Johannes Schindelin
2018-04-09  8:32     ` [PATCH v3 10/15] config: avoid using the global variable `store` Johannes Schindelin
2018-04-09  8:32     ` [PATCH v3 11/15] config_set_store: rename some fields for consistency Johannes Schindelin
2018-04-09  8:32     ` [PATCH v3 12/15] git_config_set: do not use a state machine Johannes Schindelin
2018-04-09  8:32     ` [PATCH v3 13/15] git_config_set: make use of the config parser's event stream Johannes Schindelin
2018-05-08 13:42       ` Jeff King
2018-05-08 14:00         ` Jeff King
2018-04-09  8:32     ` [PATCH v3 14/15] git config --unset: remove empty sections (in the common case) Johannes Schindelin
2018-04-09  8:32     ` [PATCH v3 15/15] git_config_set: reuse empty sections Johannes Schindelin

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