[PATCH v2 10/29] python/qemu: Add binutils::binary_get_qom_implementations()

[Philippe Mathieu-Daudé]

Since QEMU binaries can be built with various configurations,
the list of QOM objects linked can vary.
Add a helper to query the list of all QOM types implementing a
particular interface.

Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com>
---
 python/qemu/binutils.py          | 20 ++++++++++++++++++++
 tests/acceptance/core_scripts.py | 10 ++++++++++
 2 files changed, 30 insertions(+)

diff --git a/python/qemu/binutils.py b/python/qemu/binutils.py
index 7bb57c521b..76f256f5d2 100644
--- a/python/qemu/binutils.py
+++ b/python/qemu/binutils.py
@@ -66,3 +66,23 @@ def binary_get_machines(qemu_bin):
         LOG.info(res)
         vm.shutdown()
         return [m['name'] for m in res]
+
+def binary_get_qom_implementations(qemu_bin, type_name, 
include_abstract=False):
+    '''
+    Get list of QOM types implementing a particular interface
+
+    @param qemu_bin (str): path to the QEMU binary
+    @param type_name (str): QOM interface name
+    @param include_abstract (bool): if True, abstract interfaces are also
+                                    returned in the list
+    @return list of QOM types implementing the interface @type_name
+    '''
+    with QEMUMachine(qemu_bin) as vm:
+        vm.set_machine('none')
+        vm.launch()
+        res = vm.command('qom-list-types',
+                         implements=type_name,
+                         abstract=include_abstract)
+        LOG.info(res)
+        vm.shutdown()
+        return [m['name'] for m in res]
diff --git a/tests/acceptance/core_scripts.py b/tests/acceptance/core_scripts.py
index a5b112f928..c2fe4acf1d 100644
--- a/tests/acceptance/core_scripts.py
+++ b/tests/acceptance/core_scripts.py
@@ -18,6 +18,7 @@ sys.path.append(os.path.join(os.path.dirname(__file__), '..', 
'..', 'python'))
 from avocado_qemu import Test
 from qemu.binutils import binary_get_arch
 from qemu.binutils import binary_get_machines
+from qemu.binutils import binary_get_qom_implementations
 from qemu.binutils import binary_get_version
 
 
@@ -49,3 +50,12 @@ class PythonQemuCoreScripts(Test):
             logger.debug('machine: {}'.format(m))
         # The 'none' machine is always available
         self.assertIn('none', machines)
+
+    def test_get_qom_implementation(self):
+        logger = logging.getLogger('core')
+        type_name = "accel"
+        type_impl = binary_get_qom_implementations(self.qemu_bin,
+                                                   type_name, True)
+        for t in type_impl:
+            logger.debug('type: {}'.format(t))
+        self.assertIn(type_name, type_impl)
-- 
2.21.1