oeqa/runtime/ping: Improve failure message to include more detail

When the ping test fails due to a timeout we only get limited debug
information. Tweak the code to improve that in case it sheds any light
on intermittent failures.

(From OE-Core rev: d81704057950e1970ef7f673fa771834fd2b3f1e)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/cases/ping.py

@@ -6,6 +6,7 @@ from subprocess import Popen, PIPE
 
 from oeqa.runtime.case import OERuntimeTestCase
 from oeqa.core.decorator.oetimeout import OETimeout
+from oeqa.core.exception import OEQATimeoutError
 
 class PingTest(OERuntimeTestCase):
 
@@ -13,14 +14,17 @@ class PingTest(OERuntimeTestCase):
     def test_ping(self):
         output = ''
         count = 0
-        while count < 5:
-            cmd = 'ping -c 1 %s' % self.target.ip
-            proc = Popen(cmd, shell=True, stdout=PIPE)
-            output += proc.communicate()[0].decode('utf-8')
-            if proc.poll() == 0:
-                count += 1
-            else:
-                count = 0
+        try:
+            while count < 5:
+                cmd = 'ping -c 1 %s' % self.target.ip
+                proc = Popen(cmd, shell=True, stdout=PIPE)
+                output += proc.communicate()[0].decode('utf-8')
+                if proc.poll() == 0:
+                    count += 1
+                else:
+                    count = 0
+        except OEQATimeoutError:
+            self.fail("Ping timeout error for address %s, count %s, output: %s" % (self.target.ip, count, output))
         msg = ('Expected 5 consecutive, got %d.\n'
                'ping output is:\n%s' % (count,output))
         self.assertEqual(count, 5, msg = msg)