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From: Junio C Hamano <gitster@pobox.com>
To: Todd Zullinger <tmz@pobox.com>
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"SZEDER Gábor" <szeder.dev@gmail.com>,
	git@vger.kernel.org, "Sebastian Staudt" <koraktor@gmail.com>,
	"Josh Steadmon" <steadmon@google.com>,
	"Johannes Schindelin" <Johannes.Schindelin@gmx.de>
Subject: [PATCH v3] commit-graph tests: fix unportable "dd" invocation
Date: Fri, 22 Feb 2019 11:23:34 -0800
Message-ID: <xmqq36ofr5jd.fsf_-_@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <20190222183553.GA16125@zaya.teonanacatl.net> (Todd Zullinger's message of "Fri, 22 Feb 2019 13:35:53 -0500")

Todd Zullinger <tmz@pobox.com> writes:

> s/ as/ has/ ?

Oops and thanks.  Here is my second attempt (which makes it v3).

-- >8 --
From: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Date: Thu, 21 Feb 2019 20:28:49 +0100

Change an unportable invocation of "dd" with count=0, that wanted to
truncate the commit-graph file.  In POSIX it is unspecified what
happens when count=0 is provided[1]. The NetBSD "dd" behavior
differs from GNU (and seemingly other BSDs), which has left this test
broken since d2b86fbaa1 ("commit-graph: fix buffer read-overflow",
2019-01-15).

Copying from /dev/null would seek/truncate to seek=$zero_pos and
stop immediately after that (without being able to copy anything),
which is the right way to truncate the file.

1. http://pubs.opengroup.org/onlinepubs/9699919799/utilities/dd.html

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Helped-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/t5318-commit-graph.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index d4bd1522fe..561796f280 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -382,7 +382,7 @@ corrupt_graph_and_verify() {
 	test_when_finished mv commit-graph-backup $objdir/info/commit-graph &&
 	cp $objdir/info/commit-graph commit-graph-backup &&
 	printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc &&
-	dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=0 &&
+	dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" if=/dev/null &&
 	generate_zero_bytes $(($orig_size - $zero_pos)) >>"$objdir/info/commit-graph" &&
 	test_must_fail git commit-graph verify 2>test_err &&
 	grep -v "^+" test_err >err &&
-- 
2.21.0-rc2


      reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-19 23:29 [ANNOUNCE] Git v2.21.0-rc2 Junio C Hamano
2019-02-20  0:43 ` Randall S. Becker
2019-02-20 19:41   ` Junio C Hamano
2019-02-20 20:46     ` Johannes Schindelin
2019-02-21 13:10     ` Duy Nguyen
2019-02-21 23:55       ` brian m. carlson
2019-02-22  9:13         ` Duy Nguyen
2019-02-21 15:54     ` Randall S. Becker
2019-02-21 20:04       ` Junio C Hamano
2019-02-21 21:06       ` SZEDER Gábor
2019-02-21 21:30         ` Randall S. Becker
2019-02-21 19:59     ` Randall S. Becker
2019-02-21 10:46 ` Git for Windows v2.21.0-rc2, was " Johannes Schindelin
2019-02-21 19:28 ` [PATCH 0/2] BSD portability fixes for 2.21.0-rc2 Ævar Arnfjörð Bjarmason
2019-02-22  0:37   ` Josh Steadmon
2019-02-21 19:28 ` [PATCH 1/2] tests: fix unportable "\?" and "\+" regex syntax Ævar Arnfjörð Bjarmason
2019-02-22  5:00   ` Junio C Hamano
2019-02-21 19:28 ` [PATCH 2/2] commit-graph tests: fix cryptic unportable "dd" invocation Ævar Arnfjörð Bjarmason
2019-02-21 20:43   ` SZEDER Gábor
2019-02-21 22:26     ` Ævar Arnfjörð Bjarmason
2019-02-22 10:50       ` SZEDER Gábor
2019-02-22 14:34         ` Ævar Arnfjörð Bjarmason
2019-02-22 18:30           ` Junio C Hamano
2019-02-22 18:35             ` Todd Zullinger
2019-02-22 19:23               ` Junio C Hamano [this message]

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