Re: [PATCH 2/3] t4216: fix broken '&&'-chain

From: Taylor Blau <me@ttaylorr.com>
To: Eric Sunshine <sunshine@sunshineco.com>
Cc: Taylor Blau <me@ttaylorr.com>, Git List <git@vger.kernel.org>,
	Jeff King <peff@peff.net>, Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH 2/3] t4216: fix broken '&&'-chain
Date: Tue, 30 Jun 2020 14:39:28 -0400	[thread overview]
Message-ID: <20200630183928.GB26550@syl.lan> (raw)
In-Reply-To: <CAPig+cQv3cHe5ci3mDvNKYXbVQt6Rp5icG-woaDCqfAtzZ6SZw@mail.gmail.com>

On Tue, Jun 30, 2020 at 01:50:22PM -0400, Eric Sunshine wrote:
> On Tue, Jun 30, 2020 at 1:17 PM Taylor Blau <me@ttaylorr.com> wrote:
> > In a759bfa9ee (t4216: add end to end tests for git log with Bloom
> > filters, 2020-04-06), a 'rm' invocation was added without a
> > corresponding '&&' chain.
> >
> > This ends up working fine when the file already exists, in which case
> > 'rm' exits cleanly and the rest of the function executes normally. When
> > the file does _not_ exist, however, 'rm' returns an unclean exit code,
> > causing the function to terminate.
>
> This explanation makes no sense. Since this command was not part of
> the &&-chain, its failure would not cause the function to terminate
> prematurely nor would it affect the return value of the function. This
> explanation would make sense, however, if you're talking about the
> behavior _after_ fixing the broken &&-chain.

Fair enough. For what it's worth, this explanation *does* make sense if
you 'set -e' beforehand, which I am accustomed to (and had incorrectly
assumed that tests in 't' also have 'set -e', when they do not).

I've corrected the patch and shortened it to account for your
suggestions. Mind taking a look at the updated version and telling me
what you think?

--- >8 ---

Subject: [PATCH] t4216: fix broken '&&'-chain

The 'rm' added in a759bfa9ee (t4216: add end to end tests for git log
with Bloom filters, 2020-04-06) should be placed within the function's
'&&'-chain.

The file being removed may not exist (for eg., in the case of '--run',
in which case it may not be generated beforehand by a skipped test), and
so add '-f' to account for the file's optional existence.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 t/t4216-log-bloom.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t4216-log-bloom.sh b/t/t4216-log-bloom.sh
index c855bcd3e7..0b4cc4f8d1 100755
--- a/t/t4216-log-bloom.sh
+++ b/t/t4216-log-bloom.sh
@@ -53,7 +53,7 @@ sane_unset GIT_TRACE2_PERF_BRIEF
 sane_unset GIT_TRACE2_CONFIG_PARAMS

 setup () {
-	rm "$TRASH_DIRECTORY/trace.perf"
+	rm -f "$TRASH_DIRECTORY/trace.perf" &&
 	git -c core.commitGraph=false log --pretty="format:%s" $1 >log_wo_bloom &&
 	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.perf" git -c core.commitGraph=true log --pretty="format:%s" $1 >log_w_bloom
 }
--
2.27.0.224.g4cfa086e50

