[PATCH v3 1/2] test-lib.sh: add limited processes to test-lib

From: Han Xin <hanxin.hx@bytedance.com>
Date: Jun 28, 2022, 02:02 UTC
Message-ID: <ad0a539759ab79adb7a5b4c87f1a1548012ffbbe.1656381667.git.hanxin.hx@bytedance.com>
In-Reply-To: <cover.1656381667.git.hanxin.hx@bytedance.com>

We will use the lazy prerequisite ULIMIT_PROCESSES in a follow-up commit.

With run_with_limited_processses() we can limit forking subprocesses and fail reliably in some test cases.

Signed-off-by: Han Xin <hanxin.hx@bytedance.com>
---
 t/test-lib.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/t/test-lib.sh b/t/test-lib.sh
index 8ba5ca1534..655d6d543f 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1816,6 +1816,22 @@ test_lazy_prereq ULIMIT_FILE_DESCRIPTORS '
 	run_with_limited_open_files true
 '
 
+run_with_limited_processses () {
+	# bash and ksh use "ulimit -u", dash uses "ulimit -p"
+	if test -n "$BASH_VERSION"
+	then
+		ulimit_max_process="-u"
+	elif test -n "$KSH_VERSION"
+	then
+		ulimit_max_process="-u"
+	fi
+	(ulimit ${ulimit_max_process-"-p"} 512 && "$@")
+}
+
+test_lazy_prereq ULIMIT_PROCESSES '
+	run_with_limited_processses true
+'
+
 build_option () {
 	git version --build-options |
 	sed -ne "s/^$1: //p"

-- 
2.36.1