log test: skip a failing mkstemp() test under valgrind

Skip a test added in f1e3df31699 (t: increase test coverage of
signature verification output, 2020-03-04) when running under
valgrind. Due to valgrind's interception of mkstemp() this test will
fail with:

	+ pwd
	+ TMPDIR=[...]/t/trash directory.t4202-log/bogus git log --show-signature -n1 plain-fail
	==7696== VG_(mkstemp): failed to create temp file: [...]/t/trash directory.t4202-log/bogus/valgrind_proc_7696_cmdline_d545ddcf
	[... 10 more similar lines omitted ..]
	valgrind: Startup or configuration error:
	valgrind:    Can't create client cmdline file in [...]/t/trash directory.t4202-log/bogus/valgrind_proc_7696_cmdline_6e542d1d
	valgrind: Unable to start up properly.  Giving up.
	error: last command exited with $?=1

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index be07407f855597ca276deccfbc17c3b692aa0642..6e66352558212e9a40404ef892a0944ab3d09db3 100755 (executable)
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -1992,10 +1992,13 @@ test_expect_success GPG 'log --show-signature for merged tag with GPG failure' '
        git tag -s -m signed_tag_msg signed_tag_fail &&
        git checkout plain-fail &&
        git merge --no-ff -m msg signed_tag_fail &&
-       TMPDIR="$(pwd)/bogus" git log --show-signature -n1 plain-fail >actual &&
-       grep "^merged tag" actual &&
-       grep "^No signature" actual &&
-       ! grep "^gpg: Signature made" actual
+       if ! test_have_prereq VALGRIND
+       then
+               TMPDIR="$(pwd)/bogus" git log --show-signature -n1 plain-fail >actual &&
+               grep "^merged tag" actual &&
+               grep "^No signature" actual &&
+               ! grep "^gpg: Signature made" actual
+       fi
 '
 
 test_expect_success GPGSM 'log --graph --show-signature for merged tag x509' '