Split migrate_item_to_target_suite into two

Signed-off-by: Niels Thykier <niels@thykier.net>

britney2/migration.py

@@ -331,43 +331,52 @@ class MigrationManager(object):
         # return the affected packages (direct and than all)
         return (affected_direct, affected_all)
 
-    def migrate_item_to_target_suite(self, actions, nuninst_now, stop_on_first_regression=True):
-        is_accepted = True
+    def _apply_multiple_items_to_target_suite(self, items):
         affected_architectures = set()
-        target_suite = self.suite_info.target_suite
-        packages_t = target_suite.binaries
-
-        nobreakall_arches = self.options.nobreakall_arches
-        new_arches = self.options.new_arches
-        break_arches = self.options.break_arches
-        arch = None
-
-        if len(actions) == 1:
-            item = actions[0]
+        is_source_migration = False
+        if len(items) == 1:
+            item = items[0]
             # apply the changes
             affected_direct, affected_all = self._apply_item_to_target_suite(item)
             if item.architecture == 'source':
                 affected_architectures = set(self.options.architectures)
+                is_source_migration = True
             else:
                 affected_architectures.add(item.architecture)
         else:
             removals = set()
             affected_direct = set()
             affected_all = set()
-            for item in actions:
+            for item in items:
                 _, rms, _ = self._compute_groups(item, allow_smooth_updates=False)
                 removals.update(rms)
                 affected_architectures.add(item.architecture)
 
             if 'source' in affected_architectures:
                 affected_architectures = set(self.options.architectures)
+                is_source_migration = True
 
-            for item in actions:
+            for item in items:
                 item_affected_direct, item_affected_all = self._apply_item_to_target_suite(item,
                                                                                            removals=removals)
                 affected_direct.update(item_affected_direct)
                 affected_all.update(item_affected_all)
 
+        return is_source_migration, affected_architectures, affected_direct, affected_all
+
+    def migrate_item_to_target_suite(self, items, nuninst_now, stop_on_first_regression=True):
+        is_accepted = True
+        target_suite = self.suite_info.target_suite
+        packages_t = target_suite.binaries
+
+        nobreakall_arches = self.options.nobreakall_arches
+        new_arches = self.options.new_arches
+        break_arches = self.options.break_arches
+        arch = None
+
+        is_source_migration, affected_architectures, affected_direct, affected_all = \
+            self._apply_multiple_items_to_target_suite(items)
+
         # Optimise the test if we may revert directly.
         # - The automatic-revert is needed since some callers (notably via hints) may
         #   accept the outcome of this migration and expect nuninst to be updated.
@@ -404,7 +413,7 @@ class MigrationManager(object):
                     if not regression.isdisjoint(must_be_installable):
                         worse = True
                 # ... except for a few special cases
-                if worse and ((item.architecture != 'source' and arch not in new_arches) or
+                if worse and ((not is_source_migration and arch not in new_arches) or
                               (arch not in break_arches)):
                     is_accepted = False
                     break