From: Denton Liu <liu.denton@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Git Mailing List" <git@vger.kernel.org>,
"Eric Sunshine" <sunshine@sunshineco.com>,
"Johannes Sixt" <j6t@kdbg.org>,
"SZEDER Gábor" <szeder.dev@gmail.com>
Subject: Re: [PATCH v4 01/14] t: teach test_cmp_rev to accept ! for not-equals
Date: Fri, 8 Nov 2019 00:23:10 -0800 [thread overview]
Message-ID: <20191108082310.GA2497@generichostname> (raw)
In-Reply-To: <xmqqpni3nj8j.fsf@gitster-ct.c.googlers.com>
On Fri, Nov 08, 2019 at 12:24:12PM +0900, Junio C Hamano wrote:
> Denton Liu <liu.denton@gmail.com> writes:
>
> > Currently, in the case where we are using test_cmp_rev() to report
> > not-equals, we write `! test_cmp_rev`. However, since test_cmp_rev()
> > contains
> >
> > r1=$(git rev-parse --verify "$1") &&
> > r2=$(git rev-parse --verify "$2") &&
> >
> > In the case where `git rev-parse` segfaults and dies unexpectedly, the
> > failure will be ignored.
I'll probably reword this to
In the case where we are using test_cmp_rev() to report
not-equals, we write `! test_cmp_rev`. However, since
test_cmp_rev() contains
r1=$(git rev-parse --verify "$1") &&
r2=$(git rev-parse --verify "$2") &&
`! test_cmp_rev` will succeed if any of the rev-parses fail.
This behavior is not desired. We want the rev-parses to _always_
be successful.
because of your puzzlement below.
>
> Good justification. The last two lines are continuation of the
> sentence that begins the proposed log message, so downcase "In" at
> the beginning of the line. Also, when we present the problem to be
> solved at the beginning, it is customary to describe the status quo,
> and "Currently, " is a noiseword that does not add much information,
> so drop it.
Thanks, I'll make a note to stop doing this in future patches as well.
[...]
>
> > test_cmp_rev () {
> > + local inverted_op
> > + inverted_op='!='
> > + if test $# -ge 1 && test "x$1" = 'x!'
> > + then
> > + inverted_op='='
> > + shift
> > + fi
>
> I'd rather avoid having to keep track of negation to reduce mental
> burden. How about using = by default and != when '!' was given
> (which would be more natural to readers) and call it $op, and say
> "if ! test $r1 $op $r2" where it is used?
Good idea, I felt a little uneasy doing the inverted thing but it never
occurred to me to just negate the return code of `test`.
>
>
> > if test $# != 2
> > then
> > error "bug in the test script: test_cmp_rev requires two revisions, but got $#"
> > else
> > local r1 r2
> > r1=$(git rev-parse --verify "$1") &&
> > r2=$(git rev-parse --verify "$2") &&
>
> If either of the calls fail, the assignment itself would fail, and
> the &&-cascade would stop without executing the if statment below.
>
> I see the "!" feature, but where is the promised "fix" for
> segfaulting rev-parse?
>
> Puzzled.
I suppose your puzzlement comes from my badly worded commit message
above. I meant to say that in the _hypothetical_ case that
`git rev-parse` segfaults, it wouldn't be caught because we're
blanket-ignoring failures if we do `! test_cmp_rev`.
But I suppose I focused too much on segfaults. I guess I didn't realise
that the problem is more general than that; any failure of
`git rev-parse` should be reported.
Thanks for the review,
Denton
next prev parent reply other threads:[~2019-11-08 8:23 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-17 23:16 [PATCH 00/12] t5520: various test cleanup Denton Liu
2019-10-17 23:16 ` [PATCH 01/12] t5520: improve test style Denton Liu
2019-10-17 23:16 ` [PATCH 02/12] t5520: use sq for test case names Denton Liu
2019-10-17 23:17 ` [PATCH 03/12] t5520: let sed open its own input Denton Liu
2019-10-17 23:17 ` [PATCH 04/12] t5520: replace test -f with test_path_is_file Denton Liu
2019-10-17 23:26 ` Eric Sunshine
2019-10-17 23:35 ` [PATCH 4.5/12] t5520: replace test -f with test-lib functions Denton Liu
2019-10-18 0:11 ` Eric Sunshine
2019-10-17 23:17 ` [PATCH 05/12] t5520: remove spaces after redirect operator Denton Liu
2019-10-17 23:17 ` [PATCH 06/12] t5520: use test_line_count where possible Denton Liu
2019-10-17 23:17 ` [PATCH 07/12] t5520: replace test -{n,z} with test-lib functions Denton Liu
2019-10-17 23:31 ` Eric Sunshine
2019-10-17 23:17 ` [PATCH 08/12] t5520: use test_cmp_rev where possible Denton Liu
2019-10-17 23:41 ` Eric Sunshine
2019-10-18 18:52 ` Denton Liu
2019-10-23 13:53 ` Eric Sunshine
2019-10-17 23:17 ` [PATCH 09/12] t5520: test single-line files by git with test_cmp Denton Liu
2019-10-17 23:49 ` Eric Sunshine
2019-10-17 23:17 ` [PATCH 10/12] t5520: don't put git in upstream of pipe Denton Liu
2019-10-17 23:17 ` [PATCH 11/12] t5520: replace subshell cat comparison with test_cmp Denton Liu
2019-10-17 23:17 ` [PATCH 12/12] t5520: replace `! git` with `test_must_fail git` Denton Liu
2019-10-18 22:10 ` [PATCH v2 00/15] t5520: various test cleanup Denton Liu
2019-10-18 22:04 ` [PATCH v2 01/15] t7408: replace `test_must_fail test_path_is_file` Denton Liu
2019-10-19 11:58 ` Johannes Sixt
2019-10-18 22:04 ` [PATCH v2 09/15] t5520: replace test -{n,z} with test-lib functions Denton Liu
2019-10-18 22:04 ` [PATCH v2 11/15] t5520: test single-line files by git with test_cmp Denton Liu
2019-10-18 22:10 ` [PATCH v2 02/15] t: teach test_cmp_rev to accept ! for not-equals Denton Liu
2019-10-18 22:45 ` SZEDER Gábor
2019-10-18 22:10 ` [PATCH v2 03/15] t5520: improve test style Denton Liu
2019-10-18 22:10 ` [PATCH v2 04/15] t5520: use sq for test case names Denton Liu
2019-10-18 22:10 ` [PATCH v2 05/15] t5520: let sed open its own input Denton Liu
2019-10-18 22:10 ` [PATCH v2 06/15] t5520: replace test -f with test-lib functions Denton Liu
2019-10-18 22:10 ` [PATCH v2 07/15] t5520: remove spaces after redirect operator Denton Liu
2019-10-18 22:10 ` [PATCH v2 08/15] t5520: use test_line_count where possible Denton Liu
2019-10-18 22:10 ` [PATCH v2 10/15] t5520: use test_cmp_rev " Denton Liu
2019-10-18 22:10 ` [PATCH v2 12/15] t5520: don't put git in upstream of pipe Denton Liu
2019-10-18 22:10 ` [PATCH v2 13/15] t5520: replace subshell cat comparison with test_cmp Denton Liu
2019-10-18 22:10 ` [PATCH v2 14/15] t5520: remove redundant lines in test cases Denton Liu
2019-10-18 22:10 ` [PATCH v2 15/15] t5520: replace `! git` with `test_must_fail git` Denton Liu
2019-10-18 22:14 ` [PATCH v2 00/15] t5520: various test cleanup Denton Liu
2019-10-22 10:19 ` [PATCH v3 00/14] " Denton Liu
2019-10-22 10:19 ` [PATCH v3 01/14] t: teach test_cmp_rev to accept ! for not-equals Denton Liu
2019-10-22 10:19 ` [PATCH v3 02/14] t5520: improve test style Denton Liu
2019-10-22 10:19 ` [PATCH v3 03/14] t5520: use sq for test case names Denton Liu
2019-10-22 10:20 ` [PATCH v3 04/14] t5520: let sed open its own input Denton Liu
2019-10-22 10:20 ` [PATCH v3 05/14] t5520: replace test -f with test-lib functions Denton Liu
2019-10-22 10:20 ` [PATCH v3 06/14] t5520: remove spaces after redirect operator Denton Liu
2019-10-22 10:20 ` [PATCH v3 07/14] t5520: use test_line_count where possible Denton Liu
2019-10-22 10:20 ` [PATCH v3 08/14] t5520: replace test -{n,z} with test-lib functions Denton Liu
2019-10-22 10:20 ` [PATCH v3 09/14] t5520: use test_cmp_rev where possible Denton Liu
2019-10-22 10:20 ` [PATCH v3 10/14] t5520: test single-line files by git with test_cmp Denton Liu
2019-10-22 10:20 ` [PATCH v3 11/14] t5520: don't put git in upstream of pipe Denton Liu
2019-10-22 10:20 ` [PATCH v3 12/14] t5520: replace subshell cat comparison with test_cmp Denton Liu
2019-10-22 10:20 ` [PATCH v3 13/14] t5520: remove redundant lines in test cases Denton Liu
2019-10-22 10:20 ` [PATCH v3 14/14] t5520: replace `! git` with `test_must_fail git` Denton Liu
2019-10-24 23:21 ` [PATCH v3 00/14] t5520: various test cleanup Denton Liu
2019-10-25 3:44 ` Junio C Hamano
2019-11-04 19:17 ` Denton Liu
2019-11-06 2:37 ` Junio C Hamano
2019-11-07 18:51 ` [PATCH v4 " Denton Liu
2019-11-07 18:51 ` [PATCH v4 01/14] t: teach test_cmp_rev to accept ! for not-equals Denton Liu
2019-11-08 3:24 ` Junio C Hamano
2019-11-08 8:23 ` Denton Liu [this message]
2019-11-08 12:49 ` Junio C Hamano
2019-11-08 21:19 ` Denton Liu
2019-11-10 6:58 ` Junio C Hamano
2019-11-07 18:51 ` [PATCH v4 02/14] t5520: improve test style Denton Liu
2019-11-07 18:51 ` [PATCH v4 03/14] t5520: use sq for test case names Denton Liu
2019-11-07 18:51 ` [PATCH v4 04/14] t5520: let sed open its own input Denton Liu
2019-11-07 18:51 ` [PATCH v4 05/14] t5520: replace test -f with test-lib functions Denton Liu
2019-11-07 18:51 ` [PATCH v4 06/14] t5520: remove spaces after redirect operator Denton Liu
2019-11-07 18:51 ` [PATCH v4 07/14] t5520: use test_line_count where possible Denton Liu
2019-11-07 18:51 ` [PATCH v4 08/14] t5520: replace test -{n,z} with test-lib functions Denton Liu
2019-11-07 18:51 ` [PATCH v4 09/14] t5520: use test_cmp_rev where possible Denton Liu
2019-11-07 18:51 ` [PATCH v4 10/14] t5520: test single-line files by git with test_cmp Denton Liu
2019-11-07 18:51 ` [PATCH v4 11/14] t5520: don't put git in upstream of pipe Denton Liu
2019-11-07 18:51 ` [PATCH v4 12/14] t5520: replace subshell cat comparison with test_cmp Denton Liu
2019-11-07 18:51 ` [PATCH v4 13/14] t5520: remove redundant lines in test cases Denton Liu
2019-11-07 18:51 ` [PATCH v4 14/14] t5520: replace `! git` with `test_must_fail git` Denton Liu
2019-11-12 0:13 ` [PATCH v5 00/14] t5520: various test cleanup Denton Liu
2019-11-12 0:13 ` [PATCH v5 01/14] t: teach test_cmp_rev to accept ! for not-equals Denton Liu
2019-11-12 6:52 ` Junio C Hamano
2019-11-12 19:38 ` [PATCH] fixup! " Denton Liu
2019-11-12 0:13 ` [PATCH v5 02/14] t5520: improve test style Denton Liu
2019-11-12 0:13 ` [PATCH v5 03/14] t5520: use sq for test case names Denton Liu
2019-11-12 0:13 ` [PATCH v5 04/14] t5520: let sed open its own input Denton Liu
2019-11-12 0:13 ` [PATCH v5 05/14] t5520: replace test -f with test-lib functions Denton Liu
2019-11-12 0:13 ` [PATCH v5 06/14] t5520: remove spaces after redirect operator Denton Liu
2019-11-12 0:13 ` [PATCH v5 07/14] t5520: use test_line_count where possible Denton Liu
2019-11-12 0:13 ` [PATCH v5 08/14] t5520: replace test -{n,z} with test-lib functions Denton Liu
2019-11-12 0:14 ` [PATCH v5 09/14] t5520: use test_cmp_rev where possible Denton Liu
2019-11-12 0:14 ` [PATCH v5 10/14] t5520: test single-line files by git with test_cmp Denton Liu
2019-11-12 5:17 ` Junio C Hamano
2019-11-12 23:06 ` Denton Liu
2019-11-12 0:14 ` [PATCH v5 11/14] t5520: don't put git in upstream of pipe Denton Liu
2019-11-12 0:14 ` [PATCH v5 12/14] t5520: replace subshell cat comparison with test_cmp Denton Liu
2019-11-12 0:14 ` [PATCH v5 13/14] t5520: remove redundant lines in test cases Denton Liu
2019-11-12 0:14 ` [PATCH v5 14/14] t5520: replace `! git` with `test_must_fail git` Denton Liu
2019-11-12 23:07 ` [PATCH v6 00/14] t5520: various test cleanup Denton Liu
2019-11-12 23:07 ` [PATCH v6 01/14] t: teach test_cmp_rev to accept ! for not-equals Denton Liu
2019-11-13 1:57 ` Junio C Hamano
2019-11-14 0:52 ` Denton Liu
2019-11-12 23:07 ` [PATCH v6 02/14] t5520: improve test style Denton Liu
2019-11-12 23:07 ` [PATCH v6 03/14] t5520: use sq for test case names Denton Liu
2019-11-12 23:07 ` [PATCH v6 04/14] t5520: let sed open its own input Denton Liu
2019-11-12 23:07 ` [PATCH v6 05/14] t5520: replace test -f with test-lib functions Denton Liu
2019-11-12 23:07 ` [PATCH v6 06/14] t5520: remove spaces after redirect operator Denton Liu
2019-11-12 23:08 ` [PATCH v6 07/14] t5520: use test_line_count where possible Denton Liu
2019-11-12 23:08 ` [PATCH v6 08/14] t5520: replace test -{n,z} with test-lib functions Denton Liu
2019-11-12 23:08 ` [PATCH v6 09/14] t5520: use test_cmp_rev where possible Denton Liu
2019-11-12 23:08 ` [PATCH v6 10/14] t5520: test single-line files by git with test_cmp Denton Liu
2019-11-12 23:08 ` [PATCH v6 11/14] t5520: don't put git in upstream of pipe Denton Liu
2019-11-12 23:08 ` [PATCH v6 12/14] t5520: replace $(cat ...) comparison with test_cmp Denton Liu
2019-11-12 23:08 ` [PATCH v6 13/14] t5520: remove redundant lines in test cases Denton Liu
2019-11-12 23:08 ` [PATCH v6 14/14] t5520: replace `! git` with `test_must_fail git` Denton Liu
2019-11-13 1:59 ` [PATCH v6 00/14] t5520: various test cleanup Junio C Hamano
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