comps-wrapper: Return IDs instead of yum.comps.Group

We never need anything more than the ID, so passing around a big
complicated object is not necessary.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi/phases/gather/sources/source_comps.py

@@ -46,5 +46,5 @@ class GatherSourceComps(pungi.phases.gather.source.GatherSourceBase):
             comps.filter_groups(variant.groups)
 
         for i in comps.get_comps_groups():
-            groups.add(i.groupid)
+            groups.add(i)
         return set(), groups

pungi/wrappers/comps.py

@@ -45,7 +45,8 @@ class CompsWrapper(object):
         self.comps_file = comps_file
 
     def get_comps_groups(self):
-        return self.comps.get_groups()
+        """Return a list of group IDs."""
+        return [group.groupid for group in self.comps.get_groups()]
 
     def write_comps(self, comps_obj=None, target_file=None):
         if not comps_obj: