Inhibit the upgrade when the file /etc/noleapp is present on the system

Created to assist in testing the Leapp failure scenarios in automated environments

repos/system_upgrade/common/actors/dummyinhibitor/actor.py

@@ -0,0 +1,29 @@
+from leapp.actors import Actor
+from leapp import reporting
+from leapp.reporting import Report
+from leapp.tags import ChecksPhaseTag, IPUWorkflowTag
+
+import os
+
+
+class DummyInhibitor(Actor):
+    """
+    Raise an inhibitor report to halt the upgrade process when the test marker is present.
+    """
+
+    name = 'dummy_inhibitor'
+    consumes = ()
+    produces = (Report,)
+    tags = (IPUWorkflowTag, ChecksPhaseTag)
+
+    def process(self):
+        if os.path.exists("/etc/noleapp"):
+            reporting.create_report([
+                reporting.Title('Upgrade blocked by /etc/noleapp'),
+                reporting.Summary(
+                    '/etc/noleapp file is present, upgrade blocked by dummy_inhibitor actor.'
+                ),
+                reporting.Severity(reporting.Severity.HIGH),
+                reporting.Tags([reporting.Tags.SANITY]),
+                reporting.Flags([reporting.Flags.INHIBITOR]),
+            ])