qemudriver: Handle Virtio GL change in 6.1.0

Starting with version 6.1.0, the QEMU command line argument to enable
virtio with VirGL support was changed from "-vga virtio" to "-device
virtio-vgal-gl". To correctly handle this, scrape the QEMU version
number from the command output and use it to pass the correct arguments.

Signed-off-by: Joshua Watt <Joshua.Watt@garmin.com>
[bst: cherry-picked from commit df4f6a9]
Signed-off-by: Bastian Krause <bst@pengutronix.de>

Author: JoshuaWatt

labgrid/driver/qemudriver.py

@@ -6,6 +6,7 @@
 import shutil
 import socket
 import subprocess
+import re
 import tempfile
 import time
 
@@ -108,6 +109,17 @@ def _atexit(self):
             self._child.kill()
             self._child.communicate(timeout=1)
 
+    def get_qemu_version(self, qemu_bin):
+        p = subprocess.run([qemu_bin, "-version"], stdout=subprocess.PIPE, encoding="utf-8")
+        if p.returncode != 0:
+            raise ExecutionError(f"Unable to get QEMU version. QEMU exited with: {p.returncode}")
+
+        m = re.search(r'(?P<major>\d+)\.(?P<minor>\d+)\.(?P<micro>\d+)', p.stdout.splitlines()[0])
+        if m is None:
+            raise ExecutionError(f"Unable to find QEMU version in: {p.stdout.splitlines()[0]}")
+
+        return (int(m.group('major')), int(m.group('minor')), int(m.group('micro')))
+
     def on_activate(self):
         self._tempdir = tempfile.mkdtemp(prefix="labgrid-qemu-tmp-")
         sockpath = f"{self._tempdir}/serialrw"
@@ -121,6 +133,8 @@ def on_activate(self):
                 "QEMU Binary Path not configured in tools configuration key")
         self._cmd = [qemu_bin]
 
+        self._qemu_version = self.get_qemu_version(qemu_bin)
+
         boot_args = []
 
         if self.kernel is not None:
@@ -190,8 +204,12 @@ def on_activate(self):
             self._cmd.append("-display")
             self._cmd.append("none")
         elif self.display == "egl-headless":
-            self._cmd.append("-vga")
-            self._cmd.append("virtio")
+            if self._qemu_version >= (6, 1, 0):
+                self._cmd.append("-device")
+                self._cmd.append("virtio-vga-gl")
+            else:
+                self._cmd.append("-vga")
+                self._cmd.append("virtio")
             self._cmd.append("-display")
             self._cmd.append("egl-headless")
         else:

tests/test_qemudriver.py

@@ -60,22 +60,28 @@ def qemu_mock(mocker):
     socket_mock = mocker.patch('socket.socket')
     socket_mock.return_value.accept.return_value = mocker.MagicMock(), ''
 
+@pytest.fixture
+def qemu_version_mock(mocker):
+    run_mock = mocker.patch('subprocess.run')
+    run_mock.return_value.returncode = 0
+    run_mock.return_value.stdout = "QEMU emulator version 4.2.1"
+
 def test_qemu_instance(qemu_target, qemu_driver):
     assert (isinstance(qemu_driver, QEMUDriver))
 
-def test_qemu_activate_deactivate(qemu_target, qemu_driver):
+def test_qemu_activate_deactivate(qemu_target, qemu_driver, qemu_version_mock):
     qemu_target.activate(qemu_driver)
     qemu_target.deactivate(qemu_driver)
 
-def test_qemu_on_off(qemu_target, qemu_driver, qemu_mock):
+def test_qemu_on_off(qemu_target, qemu_driver, qemu_mock, qemu_version_mock):
     qemu_target.activate(qemu_driver)
 
     qemu_driver.on()
     qemu_driver.off()
 
     qemu_target.deactivate(qemu_driver)
 
-def test_qemu_read_write(qemu_target, qemu_driver, qemu_mock):
+def test_qemu_read_write(qemu_target, qemu_driver, qemu_mock, qemu_version_mock):
     qemu_target.activate(qemu_driver)
 
     qemu_driver.on()