From: Bobby Eshleman <[email protected]>
Save/restore pipefail to not mistakenly trip the if-condition
in wait_for_listener().
awk doesn't gracefully handle SIGPIPE with a non-zero exit code, so grep
exiting upon finding a match causes false-positives when the pipefail
option is used. This will enable pipefail usage, so that we can losing
failures when piping test output into log() functions.
Fixes: a4a65c6fe08b ("selftests/vsock: add initial vmtest.sh for vsock")
Signed-off-by: Bobby Eshleman <[email protected]>
---
tools/testing/selftests/vsock/vmtest.sh | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/tools/testing/selftests/vsock/vmtest.sh
b/tools/testing/selftests/vsock/vmtest.sh
index 561600814bef..ec3ff443f49a 100755
--- a/tools/testing/selftests/vsock/vmtest.sh
+++ b/tools/testing/selftests/vsock/vmtest.sh
@@ -243,6 +243,7 @@ wait_for_listener()
local port=$1
local interval=$2
local max_intervals=$3
+ local old_pipefail
local protocol=tcp
local pattern
local i
@@ -251,6 +252,13 @@ wait_for_listener()
# for tcp protocol additionally check the socket state
[ "${protocol}" = "tcp" ] && pattern="${pattern}0A"
+
+ # 'grep -q' exits on match, sending SIGPIPE to 'awk', which exits with
+ # an error, causing the if-condition to fail when pipefail is set.
+ # Instead, temporarily disable pipefail and restore it later.
+ old_pipefail=$(set -o | awk '/^pipefail[[:space:]]+(on|off)$/{print
$2}')
+ set +o pipefail
+
for i in $(seq "${max_intervals}"); do
if awk '{print $2" "$4}' /proc/net/"${protocol}"* | \
grep -q "${pattern}"; then
@@ -258,6 +266,10 @@ wait_for_listener()
fi
sleep "${interval}"
done
+
+ if [[ "${old_pipefail}" == on ]]; then
+ set -o pipefail
+ fi
}
vm_wait_for_listener() {
--
2.47.3
