From 818d297b17a55fc9c3b21784f45b23875501d654 Mon Sep 17 00:00:00 2001
From: Eric Garver <eric@garver.life>
Date: Mon, 17 Jun 2019 10:57:55 -0400
Subject: [PATCH 04/20] test: new macro PIPESTATUS0

It's essentially a portable version of bash's PIPESTATUS[0]. It passes
down the return code of the first command in the pipeline.

(cherry picked from commit 1c4bb9337f5d5c734a2a8bab10782423408d4026)
---
 src/tests/functions.at | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/tests/functions.at b/src/tests/functions.at
index 800dd92c7826..932e288f1597 100644
--- a/src/tests/functions.at
+++ b/src/tests/functions.at
@@ -242,6 +242,14 @@ m4_define([NS_CHECK], [
     AT_CHECK([NS_CMD([$1])], [$2], [$3], [$4], [$5], [$6])
 ])
 
+dnl implement PIPESTATUS[0] in a portable way
+dnl
+m4_define([PIPESTATUS0], [dnl
+    sh <<-"HERE"
+    { { { { $1; echo $? >&3; } | $2 >&4; } 3>&1; } | { read RC; exit $RC; } } 4>&1
+HERE
+])
+
 m4_define([EBTABLES_LIST_RULES], [
     dnl ebtables commit 5f508b76a0ce change list output for inversion.
     m4_define([EBTABLES_LIST_RULES_NORMALIZE], [[sed -e 's/\([-][-][-a-zA-Z0-9]\+\)[ ]\+[!]/! \1/g']])
-- 
2.20.1