From: Danh Doan <congdanhqx@gmail.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: git@vger.kernel.org
Subject: Re: [PATCH v2 7/8] t4124: fix test for non-compliant diff(1)
Date: Mon, 23 Mar 2020 22:04:49 +0700 [thread overview]
Message-ID: <20200323150449.GC11801@danh.dev> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.2003231456200.46@tvgsbejvaqbjf.bet>
On 2020-03-23 14:58:13+0100, Johannes Schindelin <Johannes.Schindelin@gmx.de> wrote:
> Hi,
>
> On Sun, 22 Mar 2020, Đoàn Trần Công Danh wrote:
>
> > POSIX's diff(1) requires output in normal diff format.
> > However, busybox's diff's output is written in unified format.
> >
> > POSIX requires no option for normal-diff format.
> >
> > A hint in test-lib-functions::test_cmp said `diff -u` isn't available
> > everywhere.
> >
> > Workaround this problem by assuming `diff(1)` output is unified
> > if we couldn't make anything from normal-diff format.
> >
> > Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
> > ---
> > t/t4124-apply-ws-rule.sh | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/t/t4124-apply-ws-rule.sh b/t/t4124-apply-ws-rule.sh
> > index 971a5a7512..075b1912be 100755
> > --- a/t/t4124-apply-ws-rule.sh
> > +++ b/t/t4124-apply-ws-rule.sh
> > @@ -52,6 +52,12 @@ test_fix () {
> >
> > # find touched lines
> > $DIFF file target | sed -n -e "s/^> //p" >fixed
> > + # busybox's diff(1) output unified format
> > + if ! test -s fixed; then
> > + $DIFF file target |
> > + grep -v '^+++ target' |
> > + sed -e "/^+/s/+//" >fixed
> > + fi
>
> In my patches (which are too unpolished to contribute, I have not found
> time to clean them up in several years), I do this differently:
>
> -- snip --
> commit cb2f3a28dbf40b92d3d9ca0f3177cd5afb7c4196
> Author: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> Date: Wed Jul 5 22:21:57 2017 +0200
>
> t4124: avoid using "normal" diff mode
>
> Everybody and their dogs, cats and other pets settled on using unified
> diffs. It is a really quaint holdover from a long-gone era that GNU diff
> outputs "normal" diff by default.
>
> Yet, t4124 relied on that mode.
>
> This mode is so out of fashion in the meantime, though, that e.g.
> BusyBox' diff decided not even to bother to support it. It only supports
> unified diffs.
>
> So let's just switch away from "normal" diffs and use unified diffs, as
> we really are only interested in the `+` lines.
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
>
> diff --git a/t/t4124-apply-ws-rule.sh b/t/t4124-apply-ws-rule.sh
> index 971a5a7512ac..133557b99333 100755
> --- a/t/t4124-apply-ws-rule.sh
> +++ b/t/t4124-apply-ws-rule.sh
> @@ -51,7 +51,7 @@ test_fix () {
> apply_patch --whitespace=fix || return 1
>
> # find touched lines
> - $DIFF file target | sed -n -e "s/^> //p" >fixed
> + $DIFF -u file target | sed -n -e "3,\$s/^+//p" >fixed
>
> # the changed lines are all expected to change
> fixed_cnt=$(wc -l <fixed)
> -- snap --
>
> Food for thought?
A comment in test-lib-functions::test_cmp mentions that
there _is_ a diff out there that doesn't understand "-u".
I don't know which one is it.
If we choose to use "diff -u" here, we've made a certain assumption,
should we flip the switch in test_cmp, too?
--
Danh
next prev parent reply other threads:[~2020-03-23 15:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-22 0:55 [PATCH v2 0/8] fix test failure with busybox Đoàn Trần Công Danh
2020-03-22 0:55 ` [PATCH v2 1/8] t4061: use POSIX compliant regex(7) Đoàn Trần Công Danh
2020-03-22 0:55 ` [PATCH v2 2/8] test-lib-functions: test_cmp: eval $GIT_TEST_CMP Đoàn Trần Công Danh
2020-03-22 0:55 ` [PATCH v2 3/8] t5003: drop the subshell in test_lazy_prereq Đoàn Trần Công Danh
2020-03-22 0:55 ` [PATCH v2 4/8] t5003: skip conversion test if unzip -a is unavailable Đoàn Trần Công Danh
2020-03-22 0:55 ` [PATCH v2 5/8] t5616: use rev-parse instead to get HEAD's object_id Đoàn Trần Công Danh
2020-03-22 0:55 ` [PATCH v2 6/8] t7063: drop non-POSIX argument "-ls" from find(1) Đoàn Trần Công Danh
2020-03-23 14:11 ` Johannes Schindelin
2020-03-23 14:37 ` Torsten Bögershausen
2020-03-23 15:11 ` Danh Doan
2020-03-23 20:30 ` Junio C Hamano
2020-03-23 15:55 ` Junio C Hamano
2020-03-24 22:31 ` Johannes Schindelin
2020-03-24 23:46 ` Junio C Hamano
2020-03-22 0:55 ` [PATCH v2 7/8] t4124: fix test for non-compliant diff(1) Đoàn Trần Công Danh
2020-03-23 13:58 ` Johannes Schindelin
2020-03-23 15:04 ` Danh Doan [this message]
2020-03-23 20:50 ` Junio C Hamano
2020-03-24 3:40 ` Danh Doan
2020-03-24 18:47 ` Junio C Hamano
2020-03-25 14:24 ` Danh Doan
2020-03-24 22:29 ` Johannes Schindelin
2020-03-24 23:37 ` Junio C Hamano
2020-03-25 18:23 ` Johannes Schindelin
2020-03-22 0:55 ` [PATCH v2 8/8] t5703: feed raw data into test-tool unpack-sideband Đoàn Trần Công Danh
2020-03-22 6:08 ` [PATCH v2 0/8] fix test failure with busybox Jeff King
2020-03-26 4:37 ` [PATCH v4 " Đoàn Trần Công Danh
2020-03-26 4:37 ` [PATCH v4 1/8] t4061: use POSIX compliant regex(7) Đoàn Trần Công Danh
2020-03-26 4:37 ` [PATCH v4 2/8] test-lib-functions: test_cmp: eval $GIT_TEST_CMP Đoàn Trần Công Danh
2020-03-26 4:37 ` [PATCH v4 3/8] t5003: drop the subshell in test_lazy_prereq Đoàn Trần Công Danh
2020-03-26 4:37 ` [PATCH v4 4/8] t5003: skip conversion test if unzip -a is unavailable Đoàn Trần Công Danh
2020-03-26 4:37 ` [PATCH v4 5/8] t5616: use rev-parse instead to get HEAD's object_id Đoàn Trần Công Danh
2020-03-26 4:37 ` [PATCH v4 6/8] t7063: drop non-POSIX argument "-ls" from find(1) Đoàn Trần Công Danh
2020-03-26 4:37 ` [PATCH v4 7/8] t4124: fix test for non-compliant diff(1) Đoàn Trần Công Danh
2020-03-27 1:18 ` Junio C Hamano
2020-03-26 4:37 ` [PATCH v4 8/8] t5703: feed raw data into test-tool unpack-sideband Đoàn Trần Công Danh
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