fix: pack no launcher file the emulator installs

The launcher layer packed a file under the launcher's name whatever the
platform installs: ROCKNIX's xemu config reads hdd/xbox_hdd.qcow2, and
the profile marks that image installed_on rocknix, yet the pack brought
one. A place whose entry the emulator installs on that platform is now
filled by the install, as validation.deliverable has it for the pack.

scripts/launchers.py

@@ -399,6 +399,11 @@ class LauncherLayer:
                 return True
             if not place.anchored:
                 continue
+            # The emulator as this platform installs it brings the file: the
+            # place is filled, nothing is packed (ROCKNIX's xemu hdd image).
+            if any(key in candidate.names and report.get("bundled")
+                   for candidate, report in matched):
+                return True
             source = self._content_for(place, name, key, matched, resolve_held)
             if source is None:
                 continue

tests/test_launcher_layer.py

@@ -186,6 +186,21 @@ class LauncherLayerTest(unittest.TestCase):
         self.assertIn("sub/fix.bin", added)
         self.assertEqual(added["sub/fix.bin"]["md5"], _md5(CONTENT["core.bin"]))
 
+    def test_a_file_the_emulator_installs_is_not_brought(self) -> None:
+        """ROCKNIX installs xemu's xbox_hdd.qcow2 (installed_on), and the
+        layer packed one under the launcher's hdd/ path all the same."""
+        profile = {
+            "emulator": "FixEmu", "type": "standalone", "systems": ["test-sys"],
+            "files": [{"name": "core.bin", "aliases": ["fix.bin"], "required": True,
+                       "installed_on": ["launchertest"]}],
+        }
+        with open(os.path.join(self.emulators_dir, "fixemu.yml"), "w") as fh:
+            yaml.dump(profile, fh)
+        _emulator_profiles_cache.clear()
+        self.profiles = load_emulator_profiles(self.emulators_dir)
+        added = [u["path"] for u in self._report() if u.get("launcher")]
+        self.assertNotIn("sub/fix.bin", added)
+
     def test_no_place_is_filled_twice(self) -> None:
         added = [u["path"] for u in self._report() if u.get("launcher")]
         self.assertEqual(sorted(added), ["e.bin", "sub/fix.bin"])