[PATCH] tests/acceptance: Fix race conditions in s390x tests & skip fedora on gitlab-CI

[Thomas Huth <thuth@redhat.com>]

There was a race condition in the first test where there was already the
"crw" output in the dmesg, but the "0.0.4711" entry has not been created
in the /sys fs yet. Fix it by waiting until it is there.

The second test has even more problems on gitlab-CI. Even after adding some
more synchronization points (that wait for some messages in the "dmesg"
output to make sure that the modules got loaded correctly), there are still
occasionally some hangs in this test when it is running in the gitlab-CI.
So far I was unable to reproduce these hangs locally on my computer, so
this issue might take a while to debug. Thus disable the 2nd test in the
gitlab-CI until the problems are better understood and fixed.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 tests/acceptance/machine_s390_ccw_virtio.py | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/tests/acceptance/machine_s390_ccw_virtio.py b/tests/acceptance/machine_s390_ccw_virtio.py
index eccf26b262..4028c99afc 100644
--- a/tests/acceptance/machine_s390_ccw_virtio.py
+++ b/tests/acceptance/machine_s390_ccw_virtio.py
@@ -12,6 +12,7 @@
 import os
 import tempfile
 
+from avocado import skipIf
 from avocado_qemu import Test
 from avocado_qemu import exec_command_and_wait_for_pattern
 from avocado_qemu import wait_for_console_pattern
@@ -133,8 +134,10 @@ class S390CCWVirtioMachine(Test):
         self.vm.command('device_add', driver='virtio-net-ccw',
                         devno='fe.0.4711', id='net_4711')
         self.wait_for_crw_reports()
-        exec_command_and_wait_for_pattern(self, 'ls /sys/bus/ccw/devices/',
-                                          '0.0.4711')
+        exec_command_and_wait_for_pattern(self, 'for i in 1 2 3 4 5 6 7 ; do '
+                    'if [ -e /sys/bus/ccw/devices/*4711 ]; then break; fi ;'
+                    'sleep 1 ; done ; ls /sys/bus/ccw/devices/',
+                    '0.0.4711')
         # and detach it again
         self.clear_guest_dmesg()
         self.vm.command('device_del', id='net_4711')
@@ -155,6 +158,7 @@ class S390CCWVirtioMachine(Test):
                                           'MemTotal:         115640 kB')
 
 
+    @skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
     def test_s390x_fedora(self):
 
         """
@@ -199,6 +203,9 @@ class S390CCWVirtioMachine(Test):
 
         # Some tests to see whether the CLI options have been considered:
         self.log.info("Test whether QEMU CLI options have been considered")
+        exec_command_and_wait_for_pattern(self,
+                        'while ! (dmesg | grep enP7p0s0) ; do sleep 1 ; done',
+                        'virtio_net virtio0 enP7p0s0: renamed')
         exec_command_and_wait_for_pattern(self, 'lspci',
                              '0007:00:00.0 Class 0200: Device 1af4:1000')
         exec_command_and_wait_for_pattern(self,
@@ -222,6 +229,9 @@ class S390CCWVirtioMachine(Test):
         # can simply read the written "magic bytes" back from the PPM file to
         # check whether the framebuffer is working as expected.
         self.log.info("Test screendump of virtio-gpu device")
+        exec_command_and_wait_for_pattern(self,
+                        'while ! (dmesg | grep gpudrmfb) ; do sleep 1 ; done',
+                        'virtio_gpudrmfb frame buffer device')
         exec_command_and_wait_for_pattern(self,
             'echo -e "\e[?25l" > /dev/tty0', ':/#')
         exec_command_and_wait_for_pattern(self, 'for ((i=0;i<250;i++)); do '
-- 
2.27.0