POC of check custom modifications

This commit introduces an actor that processes the
CustomModification messages and produces report entries.
Some basic unit tests added as well.

RHEL-1774

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

@@ -0,0 +1,19 @@
+from leapp.actors import Actor
+from leapp.libraries.actor import checkcustommodifications
+from leapp.models import CustomModifications, Report
+from leapp.tags import ChecksPhaseTag, IPUWorkflowTag
+
+
+class CheckCustomModificationsActor(Actor):
+    """
+    Checks CustomModifications messages and produces a report about files in leapp directories that have been
+    modified or newly added.
+    """
+
+    name = 'check_custom_modifications_actor'
+    consumes = (CustomModifications,)
+    produces = (Report,)
+    tags = (IPUWorkflowTag, ChecksPhaseTag)
+
+    def process(self):
+        checkcustommodifications.report_any_modifications()

repos/system_upgrade/common/actors/checkcustommodifications/libraries/checkcustommodifications.py

@@ -0,0 +1,31 @@
+from leapp import reporting
+from leapp.libraries.stdlib import api
+from leapp.models import CustomModifications
+
+
+def _create_report(msgs):
+    if not msgs:
+        # Nothing to report
+        return
+    report_type = msgs[0].type
+    discovered_files = '\n'.join(
+            ['- {filename}{actor}'.format(filename=m.filename,
+                                          actor=' ({} Actor)'.format(m.actor_name) if m.actor_name else '')
+             for m in msgs])
+    title = '{report_type} files were discovered on your system in leapp directories'
+    summary = ('Apparently some {report_type} files have been found in leapp installation directories.\n'
+               'Please consult the list of discovered files for more information:\n'
+               '{discovered_files}')
+    report_parts = [
+        reporting.Title(title.format(report_type=report_type.capitalize())),
+        reporting.Summary(summary.format(report_type=report_type, discovered_files=discovered_files)),
+        reporting.Severity(reporting.Severity.HIGH),
+        reporting.Groups([reporting.Groups.REPOSITORY]),
+    ]
+    reporting.create_report(report_parts)
+
+
+def report_any_modifications():
+    modifications = list(api.consume(CustomModifications))
+    _create_report([m for m in modifications if m.type == 'custom'])
+    _create_report([m for m in modifications if m.type == 'modified'])

repos/system_upgrade/common/actors/checkcustommodifications/tests/test_checkcustommodifications.py

@@ -0,0 +1,26 @@
+from leapp.libraries.actor import checkcustommodifications
+from leapp.models import CustomModifications, Report
+
+
+def test_report_any_modifications(current_actor_context):
+    discovered_msgs = [CustomModifications(filename='some/changed/leapp/actor/file',
+                                           type='modified',
+                                           actor_name='an_actor'),
+                       CustomModifications(filename='some/new/actor/in/leapp/dir',
+                                           type='custom',
+                                           actor_name='a_new_actor'),
+                       CustomModifications(filename='some/new/file/unrelated/to/any/actor', type='custom',
+                                           actor_name='')]
+    for msg in discovered_msgs:
+        current_actor_context.feed(msg)
+    current_actor_context.run()
+    reports = current_actor_context.consume(Report)
+    custom_files_report = next((r.report for r in reports if 'Custom' in r.report['title']), None)
+    modified_files_report = next((r.report for r in reports if 'Modified' in r.report['title']), None)
+    assert (custom_files_report['title'] ==
+            'Custom files were discovered on your system in leapp directories')
+    assert 'some/new/actor/in/leapp/dir (a_new_actor Actor)' in custom_files_report['summary']
+    assert 'some/new/file/unrelated/to/any/actor' in custom_files_report['summary']
+    assert (modified_files_report['title'] ==
+            'Modified files were discovered on your system in leapp directories')
+    assert 'some/changed/leapp/actor/file (an_actor Actor)' in modified_files_report['summary']