Remove comps groups from purely modular variants

The comps source should not return all groups when there are only
modules defined. This fixes part of the problem: non-modular packages
will not go in by default.

The second part is the comps file in the created repository. It will be
filtered to not contain any groups (because packages from there will not
be in the repo).

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

pungi/phases/gather/sources/source_comps.py

@@ -39,7 +39,8 @@ class GatherSourceComps(pungi.phases.gather.source.GatherSourceBase):
 
         comps = CompsWrapper(self.compose.paths.work.comps(arch=arch))
 
-        if variant is not None and (variant.groups or variant.type != 'variant'):
+        is_modular = variant and not variant.groups and variant.modules
+        if variant is not None and (variant.groups or variant.type != 'variant' or is_modular):
             # Get packages for a particular variant. We want to skip the
             # filtering if the variant is top-level and has no groups (to use
             # all of them).

pungi/phases/init.py

@@ -45,12 +45,16 @@ class InitPhase(PhaseBase):
 
             # write variant comps
             for variant in self.compose.get_variants():
+                is_modular = not variant.groups and variant.modules
                 for arch in variant.arches:
-                    if variant.groups or variant.type == 'optional':
+                    if variant.groups or variant.type == 'optional' or is_modular:
                         # The variant lists only some groups, run filter. Other
                         # option is that it's optional variant, in which case
                         # we want to filter everything (unless there was
                         # explicit list in which case it will be used).
+                        # For fully modular variant (one without groups but
+                        # with modules) we also want to filter (effectively
+                        # producing empty comps).
                         write_variant_comps(self.compose, arch, variant)
                     else:
                         # The variant does not mention any groups, copy

tests/test_initphase.py

@@ -53,6 +53,7 @@ class TestInitPhase(PungiTestCase):
         compose = DummyCompose(self.topdir, {})
         compose.has_comps = True
         compose.variants['Everything'].groups = []
+        compose.variants['Everything'].modules = []
         phase = init.InitPhase(compose)
         phase.run()