[PATCH v6 2/6] add "ok=sigpipe" to test_must_fail and use it to fix flaky tests

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From: Lars Schneider <larsxschneider@xxxxxxxxx>

t5516 "75 - deny fetch unreachable SHA1, allowtipsha1inwant=true" is
flaky in the following case:
1. remote upload-pack finds out "not our ref"
2. remote sends a response and closes the pipe
3. fetch-pack still tries to write commands to the remote upload-pack
4. write call in wrapper.c dies with SIGPIPE

t5504 "9 - push with transfer.fsckobjects" is flaky, too, and returns
SIGPIPE once in a while. I had to remove the final "To dst..." output
check because there is no output if the process dies with SIGPUPE.

Accept such a death-with-sigpipe also as OK when we are expecting a
failure.

Signed-off-by: Lars Schneider <larsxschneider@xxxxxxxxx>
---
 t/t5504-fetch-receive-strict.sh | 3 +--
 t/t5516-fetch-push.sh           | 6 +++---
 t/test-lib-functions.sh         | 4 ++++
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/t/t5504-fetch-receive-strict.sh b/t/t5504-fetch-receive-strict.sh
index 44f3d5f..a9e382c 100755
--- a/t/t5504-fetch-receive-strict.sh
+++ b/t/t5504-fetch-receive-strict.sh
@@ -111,8 +111,7 @@ test_expect_success 'push with transfer.fsckobjects' '
 		cd dst &&
 		git config transfer.fsckobjects true
 	) &&
-	test_must_fail git push --porcelain dst master:refs/heads/test >act &&
-	test_cmp exp act
+	test_must_fail ok=sigpipe git push --porcelain dst master:refs/heads/test >act
 '
 
 cat >bogus-commit <<\EOF
diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index ec22c98..0a87e19 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -1162,15 +1162,15 @@ do
 		mk_empty shallow &&
 		(
 			cd shallow &&
-			test_must_fail git fetch ../testrepo/.git $SHA1_3 &&
-			test_must_fail git fetch ../testrepo/.git $SHA1_1 &&
+			test_must_fail ok=sigpipe git fetch ../testrepo/.git $SHA1_3 &&
+			test_must_fail ok=sigpipe git fetch ../testrepo/.git $SHA1_1 &&
 			git --git-dir=../testrepo/.git config uploadpack.allowreachablesha1inwant true &&
 			git fetch ../testrepo/.git $SHA1_1 &&
 			git cat-file commit $SHA1_1 &&
 			test_must_fail git cat-file commit $SHA1_2 &&
 			git fetch ../testrepo/.git $SHA1_2 &&
 			git cat-file commit $SHA1_2 &&
-			test_must_fail git fetch ../testrepo/.git $SHA1_3
+			test_must_fail ok=sigpipe git fetch ../testrepo/.git $SHA1_3
 		)
 	'
 done
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 1e762da..1fdc58c 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -598,6 +598,10 @@ test_must_fail () {
 	then
 		echo >&2 "test_must_fail: command succeeded: $*"
 		return 0
+	elif ! case ",$_test_ok," in *,sigpipe,*) false;; esac &&
+		test $exit_code = 141
+	then
+		return 0
 	elif test $exit_code -gt 129 && test $exit_code -le 192
 	then
 		echo >&2 "test_must_fail: died by signal: $*"
-- 
2.5.1

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