env_process: Destroy unrequested VMs via a Setuper

Refactor the piece of code that destroyed the unrequested VMs (if asked
so) into a setuper. Import that class into env_process and register it
into the setup_manager.

Signed-off-by: Beñat Gartzia Arruabarrena <[email protected]>

virttest/env_process.py

@@ -60,6 +60,7 @@
     CheckRunningAsRoot,
 )
 from virttest.test_setup.storage import StorageConfig
+from virttest.test_setup.vms import DestroyUnrequestedVMs
 from virttest.utils_version import VersionInterval
 
 utils_libvirtd = lazy_import("virttest.utils_libvirtd")
@@ -1046,34 +1047,13 @@ def preprocess(test, params, env):
     _setup_manager.register(FirewalldService)
     _setup_manager.register(IPSniffer)
     _setup_manager.register(MigrationEnvSetup)
+    _setup_manager.register(DestroyUnrequestedVMs)
     _setup_manager.do_setup()
 
     vm_type = params.get("vm_type")
 
     base_dir = data_dir.get_data_dir()
 
-    # Destroy and remove VMs that are no longer needed in the environment or
-    # leave them untouched if they have to be disregarded only for this test
-    requested_vms = params.objects("vms")
-    keep_unrequested_vms = params.get_boolean("keep_unrequested_vms", False)
-    kill_unrequested_vms_gracefully = params.get_boolean(
-        "kill_unrequested_vms_gracefully", True
-    )
-    for key in list(env.keys()):
-        vm = env[key]
-        if not isinstance(vm, virt_vm.BaseVM):
-            continue
-        if vm.name not in requested_vms:
-            if keep_unrequested_vms:
-                LOG.debug(
-                    "The vm %s is registered in the env and disregarded "
-                    "in the current test",
-                    vm.name,
-                )
-            else:
-                vm.destroy(gracefully=kill_unrequested_vms_gracefully)
-                del env[key]
-
     global KVM_MODULE_HANDLERS
     kvm_modules = arch.get_kvm_module_list()
     for module in reversed(kvm_modules):

virttest/test_setup/vms.py

@@ -0,0 +1,34 @@
+import logging
+
+from virttest import virt_vm
+from virttest.test_setup.core import Setuper
+
+LOG = logging.getLogger(__name__)
+
+
+class DestroyUnrequestedVMs(Setuper):
+    def setup(self):
+        # Destroy and remove VMs that are no longer needed in the environment or
+        # leave them untouched if they have to be disregarded only for this test
+        requested_vms = self.params.objects("vms")
+        keep_unrequested_vms = self.params.get_boolean("keep_unrequested_vms", False)
+        kill_unrequested_vms_gracefully = self.params.get_boolean(
+            "kill_unrequested_vms_gracefully", True
+        )
+        for key in list(self.env.keys()):
+            vm = self.env[key]
+            if not isinstance(vm, virt_vm.BaseVM):
+                continue
+            if vm.name not in requested_vms:
+                if keep_unrequested_vms:
+                    LOG.debug(
+                        "The vm %s is registered in the env and disregarded "
+                        "in the current test",
+                        vm.name,
+                    )
+                else:
+                    vm.destroy(gracefully=kill_unrequested_vms_gracefully)
+                    del self.env[key]
+
+    def cleanup(self):
+        pass