083 has (at least) two issues: 1. By launching the nbd-fault-injector in background, it may not be scheduled until the first grep on its output file is executed. However, until then, that file may not have been created yet -- so it either does not exist yet (thus making the grep emit an error), or it does exist but contains stale data (thus making the rest of the test case work connect to a wrong address). Fix this by explicitly overwriting the output file before executing nbd-fault-injector.
2. The nbd-fault-injector prints things other than "Listening on...". It also prints a "Closing connection" message from time to time. We currently invoke sed on the whole file in the hope of it only containing the "Listening on..." line yet. That hope is sometimes shattered by the brutal reality of race conditions, so invoke grep before sed. Signed-off-by: Max Reitz <mre...@redhat.com> --- tests/qemu-iotests/083 | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tests/qemu-iotests/083 b/tests/qemu-iotests/083 index 0306f112da..2f6444eeb9 100755 --- a/tests/qemu-iotests/083 +++ b/tests/qemu-iotests/083 @@ -86,6 +86,7 @@ EOF rm -f "$TEST_DIR/nbd.sock" + echo > "$TEST_DIR/nbd-fault-injector.out" $PYTHON nbd-fault-injector.py $extra_args "$nbd_addr" "$TEST_DIR/nbd-fault-injector.conf" >"$TEST_DIR/nbd-fault-injector.out" 2>&1 & # Wait for server to be ready @@ -94,7 +95,7 @@ EOF done # Extract the final address (port number has now been assigned in tcp case) - nbd_addr=$(sed 's/Listening on \(.*\)$/\1/' "$TEST_DIR/nbd-fault-injector.out") + nbd_addr=$(grep 'Listening on ' "$TEST_DIR/nbd-fault-injector.out" | sed 's/Listening on \(.*\)$/\1/') if [ "$proto" = "tcp" ]; then nbd_url="nbd+tcp://$nbd_addr/$export_name" -- 2.13.6