From 44ff04f6ce608282484fa9894d7fc91e8722015d Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Fri, 22 Mar 2019 03:22:33 +0100
Subject: [PATCH 066/163] tests: check if qemu-nbd is still alive before
 waiting
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RH-Author: John Snow <jsnow@redhat.com>
Message-id: <20190322032241.8111-21-jsnow@redhat.com>
Patchwork-id: 85102
O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 20/28] tests: check if qemu-nbd is still alive before waiting
Bugzilla: 1691563
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

From: Daniel P. Berrangé <berrange@redhat.com>

If the qemu-nbd UNIX socket has not shown up, the tests will sleep a bit
and then check again repeatedly for up to 30 seconds. This is pointless
if the qemu-nbd process has quit due to an error, so check whether the
pid is still alive before waiting and retrying.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20181116155325.22428-5-berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit b39b58d5d0da3e7057d7d636641018b0fc25139b)
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 tests/qemu-iotests/common.nbd | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/common.nbd b/tests/qemu-iotests/common.nbd
index 27357f3..9f841ab 100644
--- a/tests/qemu-iotests/common.nbd
+++ b/tests/qemu-iotests/common.nbd
@@ -37,11 +37,19 @@ function nbd_server_stop()
 
 function nbd_server_wait_for_unix_socket()
 {
+    pid=$1
+
     for ((i = 0; i < 300; i++))
     do
         if [ -r "$nbd_unix_socket" ]; then
             return
         fi
+        kill -s 0 $pid 2>/dev/null
+        if test $? != 0
+        then
+            echo "qemu-nbd unexpectedly quit"
+            exit 1
+        fi
         sleep 0.1
     done
     echo "Failed in check of unix socket created by qemu-nbd"
@@ -52,5 +60,5 @@ function nbd_server_start_unix_socket()
 {
     nbd_server_stop
     $QEMU_NBD -v -t -k "$nbd_unix_socket" "$@" &
-    nbd_server_wait_for_unix_socket
+    nbd_server_wait_for_unix_socket $!
 }
-- 
1.8.3.1