tests/functional: Fix the aarch64_tcg_plugins test

Unfortunately, this test had not been added to meson.build, so we did
not notice a regression: Looking for 'Kernel panic - not syncing: VFS:'
as the indication for the final boot state of the kernel was a bad
idea since 'Kernel panic - not syncing' is the default failure
message of the LinuxKernelTest class, and since we're now reading
the console input byte by byte instead of linewise (see commit
cdad03b74f75), the failure now triggers before we fully read the
success string. Let's fix this by simply looking for the previous
line in the console output instead.

Also, replace the call to cancel() - this was only available in the
Avocado framework. In the functional framework, we must use skipTest()
instead. While we're at it, also fix the TODO here by looking for the
exact error and only skip the test if the plugins are not available.

Fixes: 3abc545e66 ("tests/functional: Convert the tcg_plugins test")
Fixes: cdad03b74f ("tests/functional: rewrite console handling to be bytewise")
Message-ID: <20250123083625.1498495-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

2 files changed, 10 insertions, 6 deletions

diff --git a/tests/functional/meson.build b/tests/functional/meson.build
index 3e11b725cb..2b2d8953aa 100644
--- a/tests/functional/meson.build
+++ b/tests/functional/meson.build
@@ -72,6 +72,7 @@ tests_aarch64_system_thorough = [
   'aarch64_sbsaref',
   'aarch64_sbsaref_alpine',
   'aarch64_sbsaref_freebsd',
+  'aarch64_tcg_plugins',
   'aarch64_tuxrun',
   'aarch64_virt',
   'aarch64_xlnx_versal',
diff --git a/tests/functional/test_aarch64_tcg_plugins.py b/tests/functional/test_aarch64_tcg_plugins.py
index 01660eb090..7e8beacc83 100755
--- a/tests/functional/test_aarch64_tcg_plugins.py
+++ b/tests/functional/test_aarch64_tcg_plugins.py
@@ -15,6 +15,7 @@ import tempfile
 import mmap
 import re
 
+from qemu.machine.machine import VMLaunchFailure
 from qemu_test import LinuxKernelTest, Asset
 
 
@@ -43,10 +44,12 @@ class PluginKernelBase(LinuxKernelTest):
 
         try:
             vm.launch()
-        except:
-            # TODO: probably fails because plugins not enabled but we
-            # can't currently probe for the feature.
-            self.cancel("TCG Plugins not enabled?")
+        except VMLaunchFailure as excp:
+            if "plugin interface not enabled in this build" in excp.output:
+                self.skipTest("TCG plugins not enabled")
+            else:
+                self.log.info(f"unhandled launch failure: {excp.output}")
+                raise excp
 
         self.wait_for_console_pattern(console_pattern, vm)
         # ensure logs are flushed
@@ -65,7 +68,7 @@ class PluginKernelNormal(PluginKernelBase):
         kernel_path = self.ASSET_KERNEL.fetch()
         kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
                                'console=ttyAMA0')
-        console_pattern = 'Kernel panic - not syncing: VFS:'
+        console_pattern = 'Please append a correct "root=" boot option'
 
         plugin_log = tempfile.NamedTemporaryFile(mode="r+t", prefix="plugin",
                                                  suffix=".log")
@@ -91,7 +94,7 @@ class PluginKernelNormal(PluginKernelBase):
         kernel_path = self.ASSET_KERNEL.fetch()
         kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
                                'console=ttyAMA0')
-        console_pattern = 'Kernel panic - not syncing: VFS:'
+        console_pattern = 'Please append a correct "root=" boot option'
 
         plugin_log = tempfile.NamedTemporaryFile(mode="r+t", prefix="plugin",
                                                  suffix=".log")