chore: drop the shared groups no platform reads

Six of the eight shared groups injected nothing: three were
included by no platform, three repeated System.dat entry for entry,
so a correction made in them reached no pack. They are removed with
their scraper wiring, and a test requires every remaining group to
contribute an entry somewhere.

platforms/_shared.yml

@@ -3,39 +3,6 @@
 # Referenced via `includes: [group_name]` in platform configs.
 
 shared_groups:
-  mt32:
-    - name: MT32_CONTROL.ROM
-      sha1: "b083518fffb7f66b03c23b7eb4f868e62dc5a987"
-      md5: "5626206284b22c2734f3e9efefcd2675"
-      destination: "scummvm/extra/MT32_CONTROL.ROM"
-      required: false
-    - name: MT32_PCM.ROM
-      sha1: "f6b1eebc4b2d200ec6d3d21d51325d5b48c60252"
-      md5: "89e42e386e82e0cacb4a2704a03706ca"
-      destination: "scummvm/extra/MT32_PCM.ROM"
-      required: false
-
-  jiffydos:
-    - name: JiffyDOS_C128.bin
-      sha1: "7d1898f32beae4b2ae610d469ce578a588efaa7c"
-      destination: "vice/JiffyDOS_C128.bin"
-      required: false
-    - name: JiffyDOS_C64.bin
-      sha1: "31e73e66eccb28732daea8ec3ad1addd9b39a017"
-      destination: "vice/JiffyDOS_C64.bin"
-      required: false
-    - name: JiffyDOS_1541-II.bin
-      sha1: "b1a5b826304d3df2a27d7163c6a81a532e040d32"
-      destination: "vice/JiffyDOS_1541-II.bin"
-      required: false
-    - name: JiffyDOS_1571_repl310654.bin
-      sha1: "d4b79b60cf1eaa399d0932200eb7811e00455249"
-      destination: "vice/JiffyDOS_1571_repl310654.bin"
-      required: false
-    - name: JiffyDOS_1581.bin
-      sha1: "65bbf2be7bcd5bdcbff609d6c66471ffb9d04bfe"
-      destination: "vice/JiffyDOS_1581.bin"
-      required: false
 
   # NEC PC-9801/9821 — NP2kai core
   # np2kai hardcodes "np2kai/" subfolder for firmware lookups
@@ -114,46 +81,6 @@ shared_groups:
       crc32: "638864c1"
       size: 5288
 
-  # Sharp X68000 — PX68k core
-  # PX68k hardcodes "keropi/" subfolder for ROM lookups
-  # ref: px68k-libretro/libretro.c:1834 — sprintf(retro_system_conf, "%s%ckeropi", ...)
-  keropi:
-    - name: cgrom.dat
-      destination: keropi/cgrom.dat
-      required: true
-      sha1: "8d72c5b4d63bb14c5dbdac495244d659aa1498b6"
-      md5: "cb0a5cfcf7247a7eab74bb2716260269"
-      crc32: "9f3195f1"
-      size: 786432
-    - name: iplrom.dat
-      destination: keropi/iplrom.dat
-      required: true
-      sha1: "0ed038ed2133b9f78c6e37256807424e0d927560"
-      md5: "7fd4caabac1d9169e289f0f7bbf71d8e"
-      crc32: "72bdf532"
-      size: 131072
-    - name: iplrom30.dat
-      destination: keropi/iplrom30.dat
-      required: true
-      sha1: "239e9124568c862c31d9ec0605e32373ea74b86a"
-      md5: "f373003710ab4322642f527f567e020a"
-      crc32: "e8f8fdad"
-      size: 131072
-    - name: iplromco.dat
-      destination: keropi/iplromco.dat
-      required: true
-      sha1: "77511fc58798404701f66b6bbc9cbde06596eba7"
-      md5: "cc78d4f4900f622bd6de1aed7f52592f"
-      crc32: "6c7ef608"
-      size: 131072
-    - name: iplromxv.dat
-      destination: keropi/iplromxv.dat
-      required: true
-      sha1: "e33cdcdb69cd257b0b211ef46e7a8b144637db57"
-      md5: "0617321daa182c3f3d6f41fd02fb3275"
-      crc32: "00eeb408"
-      size: 131072
-
   # NEC PC-8801 — QUASI88 core
   # QUASI88 searches "quasi88/" subfolder first
   # ref: quasi88-libretro/src/LIBRETRO/libretro.c:463 — snprintf(..., "%s%cquasi88%c%s", ...)
@@ -183,102 +110,3 @@ shared_groups:
       destination: quasi88/N88EXT3.ROM
       required: true
       md5: "fc4b76a402ba501e6ba6de4b3e8b4273"
-
-  # Sinclair ZX Spectrum — Fuse core (Pentagon/Scorpion ROMs)
-  # VERIFIED: fuse-libretro/src/compat/paths.c compat_get_next_path()
-  # returns empty path — core searches system/ FLAT, not fuse/ subfolder.
-  # The libretro docs incorrectly show "fuse/" prefix. Tested against
-  # fuse/settings.c:221-229 which defines names without prefix.
-  # Shared group kept for platforms that DO use the fuse/ prefix (Recalbox).
-  fuse:
-    - name: 128p-0.rom
-      destination: fuse/128p-0.rom
-      required: true
-      sha1: "d07fcdeca892ee80494d286ea9ea5bf3928a1aca"
-      md5: "a249565f03b98d004ee7f019570069cd"
-      size: 16384
-    - name: 128p-1.rom
-      destination: fuse/128p-1.rom
-      required: true
-    - name: trdos.rom
-      destination: fuse/trdos.rom
-      required: true
-      sha1: "21695e3f2a8f796386ce66eea8a246b0ac44810c"
-      md5: "0da70a5d2a0e733398e005b96b7e4ba6"
-      size: 16384
-    - name: gluck.rom
-      destination: fuse/gluck.rom
-      required: true
-      sha1: "015eb96dafb273d4f4512c467e9b43c305fd1bc4"
-      md5: "d5869034604dbfd2c1d54170e874fd0a"
-      size: 16384
-    - name: 256s-0.rom
-      destination: fuse/256s-0.rom
-      required: true
-      sha1: "477114ff0fe1388e0979df1423602b21248164e5"
-      md5: "b9fda5b6a747ff037365b0e2d8c4379a"
-      size: 16384
-    - name: 256s-1.rom
-      destination: fuse/256s-1.rom
-      required: true
-      sha1: "367b5a102fb663beee8e7930b8c4acc219c1f7b3"
-      md5: "643861ad34831b255bf2eb64e8b6ecb8"
-      size: 16384
-    - name: 256s-2.rom
-      destination: fuse/256s-2.rom
-      required: true
-      sha1: "07783ee295274d8ff15d935bfd787c8ac1d54900"
-      md5: "d8ad507b1c915a9acfe0d73957082926"
-      size: 16384
-    - name: 256s-3.rom
-      destination: fuse/256s-3.rom
-      required: true
-      sha1: "33703e97cc93b7edfcc0334b64233cf81b7930db"
-      md5: "ce0723f9bc02f4948c15d3b3230ae831"
-      size: 16384
-
-  # Enterprise 128 / Videoton TVC — ep128emu core
-  # ep128emu loads ROMs from "ep128emu/roms/" subfolder
-  # ref: ep128emu-core/core/core.cpp:56,59 — romBasePath.append("/ep128emu/roms/")
-  # since v1.1.0 external BIOS is optional (built-in fallback)
-  ep128emu:
-    - name: hun.rom
-      destination: ep128emu/roms/hun.rom
-      required: false
-      md5: "22167938f142c222f40992839aa21a06"
-    - name: exos21.rom
-      destination: ep128emu/roms/exos21.rom
-      required: false
-      md5: "f36f24cbb87745fbd2714e4df881db09"
-    - name: basic21.rom
-      destination: ep128emu/roms/basic21.rom
-      required: false
-      md5: "e972fe42b398c9ff1d93ff014786aec6"
-    - name: exdos13.rom
-      destination: ep128emu/roms/exdos13.rom
-      required: false
-      md5: "ddff70c014d1958dc75378b6c9aab6f8"
-    - name: basic20.rom
-      destination: ep128emu/roms/basic20.rom
-      required: false
-      md5: "8e18edce4a7acb2c33cc0ab18f988482"
-    - name: exos20.rom
-      destination: ep128emu/roms/exos20.rom
-      required: false
-      md5: "5ad3baaad3b5156d6b60b34229a676fb"
-    - name: brd.rom
-      destination: ep128emu/roms/brd.rom
-      required: false
-      md5: "6af0402906944fd134004b85097c8524"
-
-  # Sega Saturn — Kronos core
-  # Kronos searches "kronos/" subfolder first, falls back to root
-  # ref: libretro-kronos/libretro/libretro.c, docs.libretro.com/library/kronos
-  kronos:
-    - name: saturn_bios.bin
-      destination: kronos/saturn_bios.bin
-      required: true
-      sha1: "2b8cb4f87580683eb4d760e4ed210813d667f0a2"
-      md5: "af5828fdff51384f99b3c4926be27762"
-      crc32: "2aba43c2"
-      size: 524288

platforms/retroarch.yml

@@ -990,8 +990,6 @@ systems:
       native_system: Enterprise - 64/128
       native_path: ep128emu/roms/zt19hfnt.rom
     native_id: Enterprise - 64/128
-    includes:
-    - ep128emu
   epoch-scv:
     files:
     - name: upd7801g.s01
@@ -2807,8 +2805,6 @@ systems:
     core: kronos
     manufacturer: Sega
     docs: "https://docs.libretro.com/library/kronos/"
-    includes:
-    - kronos
   sharp-x1:
     files:
     - name: IPLROM.X1
@@ -2882,8 +2878,6 @@ systems:
     core: px68k
     manufacturer: Sharp
     docs: "https://docs.libretro.com/library/px68k/"
-    includes:
-    - keropi
   sinclair-zx-spectrum:
     files:
     - name: 128-0.rom

scripts/scraper/libretro_scraper.py

@@ -451,22 +451,18 @@ class Scraper(BaseScraper):
                         systems[sys_id]["files"].append({**ef, "curated": True})
                         existing.add(key)
 
-        # ep128emu shared group for Enterprise
-        if "enterprise-64-128" in systems:
-            systems["enterprise-64-128"].setdefault("includes", [])
-            if "ep128emu" not in systems["enterprise-64-128"]["includes"]:
-                systems["enterprise-64-128"]["includes"].append("ep128emu")
-
         # Inject shared group references for systems that have core-specific
         # subdirectory requirements already defined in _shared.yml.
         # Note: fuse/ prefix NOT injected for sinclair-zx-spectrum.
         # Verified in fuse-libretro/src/compat/paths.c -core searches
         # system/ flat, not fuse/ subfolder. Docs are wrong on this.
+        # A group System.dat already covers entry for entry injects nothing
+        # (ep128emu, keropi and kronos were), and a correction made there
+        # would never reach a pack: load_platform_config keeps the
+        # platform's own entry.
         SYSTEM_SHARED_GROUPS = {
             "nec-pc-88": ["quasi88"],
             "nec-pc-98": ["np2kai"],
-            "sharp-x68000": ["keropi"],
-            "sega-saturn": ["kronos"],
         }
         for sys_id, groups in SYSTEM_SHARED_GROUPS.items():
             if sys_id in systems:

tests/test_audit_regressions.py

@@ -457,6 +457,28 @@ class APackIsSwappedInWhole(unittest.TestCase):
         self.assertNotIn('ZipFile(zip_path, "w"', source)
 
 
+class EverySharedGroupServesAPlatform(unittest.TestCase):
+    """Six of the eight shared groups injected nothing: fuse, mt32 and
+    jiffydos were included by no platform, and kronos, keropi and ep128emu
+    repeated System.dat entry for entry. load_platform_config keeps the
+    platform's own entry, so a hash corrected there changed no pack, no
+    verify and no manifest, and nothing said so."""
+
+    def test_each_group_contributes_an_entry_somewhere(self):
+        from common import list_registered_platforms, load_platform_config
+
+        platforms_dir = str(ROOT / "platforms")
+        with (ROOT / "platforms" / "_shared.yml").open(encoding="utf-8") as handle:
+            groups = set((yaml.safe_load(handle) or {}).get("shared_groups") or {})
+        served = {
+            entry.get("shared_group")
+            for name in list_registered_platforms(platforms_dir, include_archived=True)
+            for system in load_platform_config(name, platforms_dir).get("systems", {}).values()
+            for entry in system.get("files", [])
+        }
+        self.assertEqual(sorted(groups - served), [])
+
+
 class FaqRegressions(unittest.TestCase):
     """The FAQ states facts the code owns; these tie it back to the source.