[PATCH v2 16/18] tests/functional: remove time.sleep usage from tuxrun tests

["Daniel P. Berrangé" <berrange@redhat.com>]

The tuxrun tests send a series of strings to the guest to login
and then run commands. Since we have been unable to match on
console output that isn't followed by a newline, the test used
many time.sleep() statements to pretend to synchronize with
the guest.

This has proved to be unreliable for the aarch64be instance of
the tuxrun tests, with the test often hanging. The hang is a
very subtle timing problem, and it is suspected that some
(otherwise apparently harmless) I/O error messages could be
resulting in full FIFO buffers, stalling interaction with
the guest.

With the newly rewritten console interaction able to match
strings that don't have a following newline, the tux run
tests can now match directly on the login prompt, and/or
shell PS1 prompt.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2689
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/functional/qemu_test/tuxruntest.py | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/tests/functional/qemu_test/tuxruntest.py b/tests/functional/qemu_test/tuxruntest.py
index ed2b238c92..ab3b27da43 100644
--- a/tests/functional/qemu_test/tuxruntest.py
+++ b/tests/functional/qemu_test/tuxruntest.py
@@ -124,16 +124,12 @@ def run_tuxtest_tests(self, haltmsg):
         then do a few things on the console. Trigger a shutdown and
         wait to exit cleanly.
         """
-        self.wait_for_console_pattern("Welcome to TuxTest")
-        time.sleep(0.2)
-        exec_command(self, 'root')
-        time.sleep(0.2)
-        exec_command(self, 'cat /proc/interrupts')
-        time.sleep(0.1)
-        exec_command(self, 'cat /proc/self/maps')
-        time.sleep(0.1)
-        exec_command(self, 'uname -a')
-        time.sleep(0.1)
+        ps1='root@tuxtest:~#'
+        self.wait_for_console_pattern('tuxtest login:')
+        exec_command_and_wait_for_pattern(self, 'root', ps1)
+        exec_command_and_wait_for_pattern(self, 'cat /proc/interrupts', ps1)
+        exec_command_and_wait_for_pattern(self, 'cat /proc/self/maps', ps1)
+        exec_command_and_wait_for_pattern(self, 'uname -a', ps1)
         exec_command_and_wait_for_pattern(self, 'halt', haltmsg)
 
         # Wait for VM to shut down gracefully if it can
-- 
2.46.0