[WIP] [DEBUG] POC of custom modifications tracking

Please do NOT review until marked as ready.
All custom modifications ideas will be put there.

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

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+from leapp.actors import Actor
+from leapp.libraries.actor.trackcustommodifications import check_for_modifications
+from leapp.models import CustomModifications
+from leapp.tags import FactsPhaseTag, IPUWorkflowTag
+
+
+class TrackCustomModificationsActor(Actor):
+    """
+    Collects information about files in leapp directories that have been modified or newly added.
+    """
+
+    name = 'track_custom_modifications_actor'
+    produces = (CustomModifications,)
+    tags = (IPUWorkflowTag, FactsPhaseTag)
+
+    def process(self):
+        changed, custom = check_for_modifications()
+        for msg in changed + custom:
+            self.produce(msg)

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

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+import os
+
+from leapp.exceptions import StopActorExecution
+from leapp.libraries.common.config.version import get_source_major_version, get_target_major_version
+from leapp.libraries.stdlib import api, CalledProcessError, run
+from leapp.models import CustomModifications
+
+
+RPMS_TO_CHECK = ['leapp-upgrade-el{source}toel{target}']
+DIRS_TO_SCAN = ['/usr/share/leapp-repository']
+
+
+def _get_rpms_to_check():
+    return [rpm.format(source=get_source_major_version(), target=get_target_major_version()) for rpm in RPMS_TO_CHECK]
+
+
+def check_for_modifications(dirs=DIRS_TO_SCAN):
+    """
+    This will return a tuple (changes, custom) is case any untypical files or changes to shipped leapp files are
+    discovered.
+    (None, None) means that no modifications have been found.
+    """
+    rpms = _get_rpms_to_check()
+    source_of_truth = []
+    for rpm in rpms:
+        get_rpm_files_command = ['rpm', '-ql', rpm]
+        try:
+            rpm_files = run(get_rpm_files_command)
+            source_of_truth.extend(rpm_files['stdout'].strip().split())
+        except CalledProcessError:
+            api.current_logger().warning(
+                'Could not get list of installed files from rpm %s'.format(rpm)
+            )
+            raise StopActorExecution()
+    leapp_files = []
+    for directory in dirs:
+        get_files_command = ['find', directory, '-type', 'f']
+        try:
+            files = run(get_files_command)
+            leapp_files.extend(files['stdout'].strip().split())
+        except CalledProcessError:
+            api.current_logger().warning(
+            'Could not get list of leapp files in %s'.format(directory)
+            )
+            raise StopActorExecution()
+    custom_files = set(leapp_files) - set(source_of_truth)
+    # Now let's check for modifications
+    modified_files = []
+    for rpm in rpms:
+        try:
+            modified = run(['rpm', '-V', rpm])
+            modified_files.extend(modified['stdout'].strip().split())
+        except CalledProcessError:
+            api.current_logger().warning(
+            'Could not check authenticity of the files from %s'.format(rpm)
+            )
+            raise StopActorExecution()
+    # NOTE(ivasilev) Now the fun part TBD - the mapping between actor file / library and actor's
+    # name
+    # XXX Leaving blank atm as it's tbd
+    return ([CustomModifications(actor_name='', filename=f, type='modified') for f in modified_files],
+            [CustomModifications(actor_name='', filename=f, type='custom') for f in custom_files])

repos/system_upgrade/common/models/custommodifications.py

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+from leapp.models import fields, Model
+from leapp.topics import SystemFactsTopic
+
+
+class CustomModifications(Model):
+    """Model to store any custom or modified files that are discovered in leapp directories"""
+    topic = SystemFactsTopic
+
+    filename = fields.String()
+    actor_name = fields.String()
+    type = fields.StringEnum(choices=['custom', 'modified'])