diff mbox series

[v4,2/8,Newcomer] t7004: Do not lose exit status to pipe

Message ID 20240805235917.190699-3-abdobngad@gmail.com (mailing list archive)
State New, archived
Headers show
Series t7004: Modernize the style | expand

Commit Message

AbdAlRahman Gad Aug. 5, 2024, 11:59 p.m. UTC
Split "test-tool ... | sed" pipeline into two commands to avoid losing
exit status from test-tool.

Signed-off-by: AbdAlRahman Gad <abdobngad@gmail.com>
---
 t/t7004-tag.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Eric Sunshine Aug. 6, 2024, 3:13 a.m. UTC | #1
On Mon, Aug 5, 2024 at 8:00 PM AbdAlRahman Gad <abdobngad@gmail.com> wrote:
> Split "test-tool ... | sed" pipeline into two commands to avoid losing
> exit status from test-tool.
>
> Signed-off-by: AbdAlRahman Gad <abdobngad@gmail.com>
> ---
> diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
> @@ -97,7 +97,8 @@ test_expect_success 'creating a tag with --create-reflog should create reflog' '
> -       test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 | sed -e "s/^.* //" >actual &&
> +       test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 >actual.body &&
> +       sed -e "s/^.*   //" actual.body >actual &&

It's not just `test_tool` we care about; we also (importantly) don't
want to see `git` itself upstream of a pipe, and there are many such
instances remaining in this script. Here are some common examples:

    test $(git tag -l | wc -l) -eq 0 &&
    git cat-file tag "$1" | sed -e "/BEGIN PGP/q"
    git tag -l | grep "^tag-one-line" >actual &&
    forged=$(git cat-file tag ... | sed -e ... | git mktag) &&
    git tag -l --no-sort "foo*" | sort >actual &&

By the way, these days, rather than:

    test $(git tag -l | wc -l) -eq 0 &&

we would say:

    test_stdout_line_count = 0 git tag -l &&

which nicely avoids placing `git` upstream of a pipe.
AbdAlRahman Gad Aug. 6, 2024, 8:38 a.m. UTC | #2
On 8/6/24 06:13, Eric Sunshine wrote:
> On Mon, Aug 5, 2024 at 8:00 PM AbdAlRahman Gad <abdobngad@gmail.com> wrote:
>> Split "test-tool ... | sed" pipeline into two commands to avoid losing
>> exit status from test-tool.
>>
>> Signed-off-by: AbdAlRahman Gad <abdobngad@gmail.com>
>> ---
>> diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
>> @@ -97,7 +97,8 @@ test_expect_success 'creating a tag with --create-reflog should create reflog' '
>> -       test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 | sed -e "s/^.* //" >actual &&
>> +       test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 >actual.body &&
>> +       sed -e "s/^.*   //" actual.body >actual &&
> 
> It's not just `test_tool` we care about; we also (importantly) don't
> want to see `git` itself upstream of a pipe, and there are many such
> instances remaining in this script. Here are some common examples:
> 
>      test $(git tag -l | wc -l) -eq 0 &&
>      git cat-file tag "$1" | sed -e "/BEGIN PGP/q"
>      git tag -l | grep "^tag-one-line" >actual &&
>      forged=$(git cat-file tag ... | sed -e ... | git mktag) &&
>      git tag -l --no-sort "foo*" | sort >actual &&
> 
> By the way, these days, rather than:
> 
>      test $(git tag -l | wc -l) -eq 0 &&
> 
> we would say:
> 
>      test_stdout_line_count = 0 git tag -l &&
> 
> which nicely avoids placing `git` upstream of a pipe.

Thanks for the review. Could this be done in a separate patch series? As 
modifying a patch in the beginning of a patch series requires lots of 
time to adapt the rest of the series to the change.
Eric Sunshine Aug. 6, 2024, 6:05 p.m. UTC | #3
On Tue, Aug 6, 2024 at 4:38 AM AbdAlRahman Gad <abdobngad@gmail.com> wrote:
> On 8/6/24 06:13, Eric Sunshine wrote:
> > On Mon, Aug 5, 2024 at 8:00 PM AbdAlRahman Gad <abdobngad@gmail.com> wrote:
> >> -       test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 | sed -e "s/^.* //" >actual &&
> >> +       test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 >actual.body &&
> >> +       sed -e "s/^.*   //" actual.body >actual &&
> >
> > It's not just `test_tool` we care about; we also (importantly) don't
> > want to see `git` itself upstream of a pipe, and there are many such
> > instances remaining in this script. Here are some common examples:
> >
> >      test $(git tag -l | wc -l) -eq 0 &&
> >      git cat-file tag "$1" | sed -e "/BEGIN PGP/q"
> >      git tag -l | grep "^tag-one-line" >actual &&
> >      forged=$(git cat-file tag ... | sed -e ... | git mktag) &&
> >      git tag -l --no-sort "foo*" | sort >actual &&
>
> Thanks for the review. Could this be done in a separate patch series? As
> modifying a patch in the beginning of a patch series requires lots of
> time to adapt the rest of the series to the change.

As the person doing the work and submitting the patches, you choose
how much effort to put in. If you feel that fixing all the "`git`
upstream of a pipe" problems is better left for a future
"modernization" series, then that's almost certainly fine. Since
reviewers are trying to help you polish your patches, they usually
prefer to review shorter series than longer ones anyhow. If you decide
not to make these changes, though, be sure to explain your decision in
the cover letter so that reviewers understand why such a cleanup is
missing from the current series.

Having said that, if you're not going to fix all the "`git` upstream
of a pipe" cases, then you might consider dropping this patch from the
current series since it is merely touching the "tip of the iceberg" by
fixing only these two minor cases while leaving all the more
significant cases unfixed. But other reviewers may feel differently.

If you're worried about the ripple effect of making significant
changes to this patch which sits near the beginning of the series,
then one way to sidestep the issue is to relocate this patch to the
end of the series. This is possible because, unlike many other patch
series in which there is inherent order in the patches where each
change must follow the preceding change, that is not the case with
this patch series. The specific order of patches in this series is
pretty much immaterial. So, moving this patch to the end of the series
would cause only a tiny ripple since it touches only two small chunks
of code, and once the patch is last in the series, then it becomes
easy to apply all the other "`git` upstream of a pipe" fixes.

But it's up to you if you want to do that extra work. As noted above,
reviewers usually prefer a shorter simpler series over a longer more
complex one, so relegating such fixes to a followup series is almost
certainly acceptable. (But be sure to explain your decision in the
cover letter.)
diff mbox series

Patch

diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 3100a4c219..1e31f39646 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -97,7 +97,8 @@  test_expect_success 'creating a tag with --create-reflog should create reflog' '
 	test_when_finished "git tag -d tag_with_reflog1" &&
 	git tag --create-reflog tag_with_reflog1 &&
 	git reflog exists refs/tags/tag_with_reflog1 &&
-	test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 | sed -e "s/^.*	//" >actual &&
+	test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 >actual.body &&
+	sed -e "s/^.*	//" actual.body >actual &&
 	test_cmp expected actual
 '
 
@@ -108,7 +109,8 @@  test_expect_success 'annotated tag with --create-reflog has correct message' '
 	test_when_finished "git tag -d tag_with_reflog2" &&
 	git tag -m "annotated tag" --create-reflog tag_with_reflog2 &&
 	git reflog exists refs/tags/tag_with_reflog2 &&
-	test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog2 | sed -e "s/^.*	//" >actual &&
+	test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog2 >actual.body &&
+	sed -e "s/^.*	//" actual.body >actual &&
 	test_cmp expected actual
 '