From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Johannes Sixt <j6t@kdbg.org>
Cc: "Philippe Blain" <levraiphilippeblain@gmail.com>,
"René Scharfe" <l.s.r@web.de>,
"Git Mailing List" <git@vger.kernel.org>
Subject: Re: [PATCH] t3920: don't ignore errors of more than one command with `|| true`
Date: Tue, 22 Nov 2022 23:57:20 +0100 [thread overview]
Message-ID: <221123.86ilj6a8ux.gmgdl@evledraar.gmail.com> (raw)
In-Reply-To: <271dd9e6-3575-a46f-4c92-fa202aaf95d7@kdbg.org>
On Tue, Nov 22 2022, Johannes Sixt wrote:
> Am 22.11.22 um 23:24 schrieb Ævar Arnfjörð Bjarmason:
>> On Mon, Nov 21 2022, Johannes Sixt wrote:
>>> - grep 'Body' .crlf-message-$branch.txt >.crlf-body-$branch.txt || true &&
>>> + { grep 'Body' .crlf-message-$branch.txt >.crlf-body-$branch.txt || true; } &&
>>
>> Any reason not to make this:
>>
>> - grep 'Body' .crlf-message-$branch.txt >.crlf-body-$branch.txt || true &&
>> + sed -ne '/Body/p' <.crlf-message-$branch.txt >.crlf-body-$branch.txt &&
>>
>> ?
>
> Yes: I have tested my version, but not this one.
I don't find that too surprising, as unless there's a discussion of "I
tried xyz, but it didn't work, so..." a submitted patch is unlikely to
have tried various alternatives for such a trivial fix, but just gone
with whatever the author tried first.
But in case it wasn't clear, the implied suggestion is that unless there
is a good reason to introduce a pattern of:
{ <cmd> in >out || true; } &&
That we should use another suitable command with the simpler use of:
<cmd2> <in >out &&
If the result is equivalent, as subsequent maintainers won't need to
puzzle over the seemingly odd pattern.
We have that "sed -n -e" in somewhat wide use:
$ git grep 'sed (-n -e|-ne).*/p.*&&' | wc -l
54
The only existing occurance of this "grep but ignore the exit code" I
could find was:
t/t9001-send-email.sh: { grep '^X-Mailer:' out || :; } >mailer &&
For which we can also:
- { grep '^X-Mailer:' out || :; } >mailer &&
+ sed -ne '/^X-Mailer:/p' <out >mailer &&
And which I'd think would be great to have in a re-roll, i.e. "here's
these two cases where a grep-but-dont-care-about-the-exit-code could be
replaced by sed -ne".
But if re-testing this is tedious etc. I don't mind if it goes in as-is,
but then I'd think we could safely emulate the t9001-send-email.sh
pattern of using ":" instead of "true"; we don't need to invoke another
process just to ignore the exit code.
next prev parent reply other threads:[~2022-11-22 23:05 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-21 17:58 [PATCH] t3920: don't ignore errors of more than one command with `|| true` Johannes Sixt
2022-11-21 22:56 ` René Scharfe
2022-11-22 0:53 ` Junio C Hamano
2022-11-22 18:28 ` Philippe Blain
2022-11-22 22:24 ` Ævar Arnfjörð Bjarmason
2022-11-22 22:37 ` Johannes Sixt
2022-11-22 22:57 ` Ævar Arnfjörð Bjarmason [this message]
2022-11-23 0:55 ` Junio C Hamano
2022-12-02 16:51 ` [PATCH 2/1] t3920: support CR-eating grep René Scharfe
2022-12-02 23:14 ` Philippe Blain
2022-12-03 7:09 ` René Scharfe
2022-12-02 23:32 ` Eric Sunshine
2022-12-03 7:12 ` René Scharfe
2022-12-05 1:08 ` Junio C Hamano
2022-12-05 8:28 ` René Scharfe
2022-12-05 9:32 ` Junio C Hamano
2022-12-05 10:43 ` René Scharfe
2022-12-02 16:51 ` [PATCH 3/1] t3920: simplify redirection of loop output René Scharfe
2022-12-02 16:51 ` [PATCH 4/1] t3920: replace two cats with a tee René Scharfe
2022-12-03 5:09 ` Eric Sunshine
2022-12-03 8:43 ` René Scharfe
2022-12-03 12:53 ` Ævar Arnfjörð Bjarmason
2022-12-03 17:22 ` René Scharfe
2022-12-04 9:34 ` Ævar Arnfjörð Bjarmason
2022-12-04 16:39 ` Eric Sunshine
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