[PATCH v4 1/4] add function test_must_fail_or_sigpipe and use it to fix flaky tests

[larsxschneider@gmail.com]

From: Lars Schneider <larsxschneider@gmail.com>

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 SIGPIPE.

This patch accepts the SIGPIPE exit as legitimate test exit.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
---
 t/t5504-fetch-receive-strict.sh |  3 +--
 t/t5516-fetch-push.sh           |  8 ++++----
 t/test-lib-functions.sh         | 23 +++++++++++++++++++++++
 3 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/t/t5504-fetch-receive-strict.sh b/t/t5504-fetch-receive-strict.sh
index 44f3d5f..129efa8 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_or_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..22a941b 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_or_sigpipe git fetch ../testrepo/.git $SHA1_3 &&
+			test_must_fail_or_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 &&
+			test_must_fail_or_sigpipe 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_or_sigpipe git fetch ../testrepo/.git $SHA1_3
 		)
 	'
 done
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 73e37a1..19a598e 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -600,6 +600,29 @@ test_must_fail () {
 	return 0
 }

+# Similar to test_must_fail, but tolerates sigpipe signal, too.
+
+test_must_fail_or_sigpipe () {
+	"$@"
+	exit_code=$?
+	if test $exit_code = 0; then
+		echo >&2 "test_must_fail: command succeeded: $*"
+		return 1
+	elif test $exit_code -ne 141 && \
+		 test $exit_code -gt 129 && \
+		 test $exit_code -le 192; then
+		echo >&2 "test_must_fail: died by signal: $*"
+		return 1
+	elif test $exit_code = 127; then
+		echo >&2 "test_must_fail: command not found: $*"
+		return 1
+	elif test $exit_code = 126; then
+		echo >&2 "test_must_fail: valgrind error: $*"
+		return 1
+	fi
+	return 0
+}
+
 # Similar to test_must_fail, but tolerates success, too.  This is
 # meant to be used in contexts like:
 #
--
2.5.1