fix: drop defaults the build has no package for

KNULLI's configgen-defaults.yml picks suyu for the Switch, which its
es_systems.yml does not offer and no package of its tree, its batocera
submodule or its buildroot builds: KNULLI does not ship suyu. A default
es_systems.yml does not offer now counts only when a package of the
build's trees has that name, or when its launcher runs a program from
the BIOS folder (Batocera's lexaloffle). Batocera's lists are unchanged
by the rule. suyu leaves KNULLI's cores, and the XDG_DATA_HOME record
that served it goes.

scripts/scraper/knulli_scraper.py

@@ -41,8 +41,12 @@ from .batocera_scraper import (
     es_systems_by_system,
     es_systems_libretro_systems,
     extract_systems_dict,
+    package_names,
+    packages_and_programs,
     platform_systems,
+    repo_tree,
     requirements_from_systems,
+    submodule_revision,
 )
 from .es_emulators import attach_system_cores
 from .knulli_launchers import BATOCERA_SUBMODULE, extract_launchers
@@ -123,11 +127,27 @@ class Scraper(BaseScraper):
         defaults = self._fetch_text(CONFIGGEN_DEFAULTS_TEMPLATE.format(ref=self.tag))
         es_systems = self._fetch_text(ES_SYSTEMS_TEMPLATE.format(ref=self.tag))
         dropped = _not_cores("batocera") | _not_cores(PLATFORM_NAME)
-        cores, standalone, dual = configgen_cores(defaults, es_systems, dropped)
+        revision = self.submodule_revision()
+        launchers = extract_launchers(
+            lambda path: self._fetch_text(_RAW.format(ref=self.tag) + path),
+            lambda path: self._fetch_text(_BATOCERA_RAW.format(ref=revision) + path),
+        )
+        # The packages KNULLI builds come from its own tree, its batocera
+        # submodule and its buildroot submodule: a default no package of
+        # them builds (suyu) is not run.
+        paths = repo_tree(REPO, self.tag)
+        paths += repo_tree("batocera-linux/batocera.linux", revision)
+        paths += repo_tree(
+            "knulli-cfw/buildroot", submodule_revision(REPO, "buildroot", self.tag)
+        )
+        built = packages_and_programs(package_names(paths), launchers)
+        cores, standalone, dual = configgen_cores(defaults, es_systems, dropped, built)
         # Each system's own list (psx, es_systems.yml:640-653: libretro
         # pcsx_rearmed, swanstation, mednafen_psx, then duckstation and
         # duckstation-legacy).
-        attach_system_cores(systems, es_systems_by_system(es_systems, defaults, dropped))
+        attach_system_cores(
+            systems, es_systems_by_system(es_systems, defaults, dropped, built)
+        )
         result = {
             "platform": "KNULLI",
             "version": self.tag,
@@ -146,11 +166,7 @@ class Scraper(BaseScraper):
         # configgen hands a libretro core /userdata/saves/<system>, as
         # Batocera's does: the systems each core runs for are its save folders.
         result["libretro_systems"] = es_systems_libretro_systems(es_systems, dropped)
-        revision = self.submodule_revision()
-        result["launchers"] = extract_launchers(
-            lambda path: self._fetch_text(_RAW.format(ref=self.tag) + path),
-            lambda path: self._fetch_text(_BATOCERA_RAW.format(ref=revision) + path),
-        )
+        result["launchers"] = launchers
         return result