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From: Shourya Shukla <shouryashukla.oo@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: kaartic.sivaraam@gmail.com, christian.couder@gmail.com,
	git@vger.kernel.org, Johannes.Schindelin@gmx.de,
	liu.denton@gmail.com, me@ttaylorr.com
Subject: Re: [PATCH v2 1/4] t7401: modernize style
Date: Fri, 14 Aug 2020 20:11:26 +0530	[thread overview]
Message-ID: <20200814144126.GA137865@konoha> (raw)
In-Reply-To: <xmqqd03u4hpl.fsf@gitster.c.googlers.com>

On 13/08 09:46, Junio C Hamano wrote:
> Kaartic Sivaraam <kaartic.sivaraam@gmail.com> writes:
> 
> >> @@ -16,12 +16,13 @@ add_file () {
> >>  	owd=$(pwd)
> >>  	cd "$sm"
> >>  	for name; do
> >> -		echo "$name" > "$name" &&
> >> +		echo "$name" >"$name" &&
> >>  		git add "$name" &&
> >>  		test_tick &&
> >>  		git commit -m "Add $name"
> >>  	done >/dev/null
> >> -	git rev-parse --verify HEAD | cut -c1-7
> >> +	git rev-parse --verify HEAD >out &&
> >> +	cut -c1-7 out
> >
> > In any case, I believe we can avoid the 'cut' altogether in both places
> > by doing something like this instead:
> >
> >    git rev-parse --short=7 HEAD
> 
> Ah, I missed the fact that this was a helper function and most of
> the error status is discarded anyway.  For example, we still run the
> rev-parse even after the for loop fails.
> 
> If the focus of this test script were to ensure that rev-parse works
> correctly, being careful to catch its exit status might have had a
> good value, but for that, all the other operations that happen in
> this helper function (including the "what happens when the loop body
> fails for $name that is not at the end of the argument list?") must
> also be checked for their exit status in the first place.
> 
> Since that is not done, and since testing rev-parse should not have
> to be part of the job for submodule test, the net effect of the
> above change has quite dubious value---it clobbered a file 'out'
> that may be used by the caller.
> 
> Doing "cd" without introducing a subshell is a bit harder to fix, as
> test_tick relies on the global counter in the topmost process.  It
> can be done, but I do not think it is worth doing here.  Most of the
> users of this helper function call it in var=$(add_file ...)
> subshell anyway (so test_tick is incrementing the timestamp
> independently for each caller and discarding the resulting
> timestamp).  As a NEEDSWORK comment added in the series says, this
> script may need a bit more work.
> 
> I agree with you that the split of "rev-parse | cut -c1-7" into two
> statements and clobbering 'out' is a bad change---that part should
> be reverted.  The style change on 'echo "$name" >"$name"' line is
> OK, though.
> 
> Thanks.

Understood. I will revert the change. Though, what Kaartic suggested, to
do a '--short=7', that will be okay to keep right? Something like:

    git rev-parse --short=7 HEAD

This way we will not need a 'cut'. This change goes as a separate commit
obviously.


  reply	other threads:[~2020-08-14 14:41 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-05 17:49 [GSoC][RESEND][PATCH 0/4] t7401: modernize, cleanup and warn Shourya Shukla
2020-08-05 17:49 ` [PATCH 1/4] t7401: modernize style Shourya Shukla
2020-08-05 19:37   ` Denton Liu
2020-08-05 20:49     ` Taylor Blau
2020-08-06  8:45       ` Shourya Shukla
2020-08-05 17:49 ` [PATCH 2/4] t7401: change test_i18ncmp syntax for clarity Shourya Shukla
2020-08-05 20:58   ` Taylor Blau
2020-08-05 21:23   ` Junio C Hamano
2020-08-05 17:49 ` [PATCH 3/4] t7401: ensure uniformity in the '--for-status' test Shourya Shukla
2020-08-05 21:01   ` Taylor Blau
2020-08-05 22:25     ` Junio C Hamano
2020-08-05 22:26       ` Taylor Blau
2020-08-05 21:30   ` Junio C Hamano
2020-08-06  8:50     ` Shourya Shukla
2020-08-06 17:18       ` Junio C Hamano
2020-08-05 17:49 ` [PATCH 4/4] t7401: add a WARNING and a NEEDSWORK Shourya Shukla
2020-08-05 21:04   ` Taylor Blau
2020-08-05 21:36   ` Junio C Hamano
2020-08-06 11:27     ` Shourya Shukla
2020-08-06 21:11       ` Junio C Hamano
2020-08-07 14:55         ` Christian Couder
2020-08-12 19:27 ` [GSoC][PATCH v2 0/4] t7401: modernize, cleanup and more Shourya Shukla
2020-08-12 19:27   ` [PATCH v2 1/4] t7401: modernize style Shourya Shukla
2020-08-13  8:06     ` Kaartic Sivaraam
2020-08-13 16:46       ` Junio C Hamano
2020-08-14 14:41         ` Shourya Shukla [this message]
2020-08-14 17:06           ` Junio C Hamano
2020-08-12 19:27   ` [PATCH v2 2/4] t7401: change test_i18ncmp syntax for clarity Shourya Shukla
2020-08-12 20:57     ` Junio C Hamano
2020-08-12 21:02       ` Junio C Hamano
2020-08-14 14:57         ` Shourya Shukla
2020-08-12 19:27   ` [PATCH v2 3/4] t7401: change indentation for enhanced readability Shourya Shukla
2020-08-12 19:27   ` [PATCH v2 4/4] t7401: add a NEEDSWORK Shourya Shukla

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