fix: export only what the platform declares

scripts/scraper/base_scraper.py

@@ -35,6 +35,9 @@ class BiosRequirement:
     # is not always derivable from ours: libretro writes iplromco.dat bare
     # but ep128emu/roms/cpc464.rom with its directory.
     native_path: str | None = None
+    # The native system whose entry this one repeats under another system.
+    # The platform's own file does not carry the copy: an export skips it.
+    mirror_of: str | None = None
     # Fields the platform declares that have no equivalent in our model.
     # Kept verbatim so the native file can be written back unchanged.
     native: dict[str, object] = field(default_factory=dict)
@@ -95,6 +98,8 @@ def requirement_entry(req: BiosRequirement) -> dict:
         entry["native_system"] = req.native_id
     if req.native_path and req.native_path != req.name:
         entry["native_path"] = req.native_path
+    if req.mirror_of:
+        entry["mirror_of"] = req.mirror_of
     for key in sorted(req.native):
         value = req.native[key]
         if value not in (None, "", [], {}):

scripts/scraper/libretro_scraper.py

@@ -279,9 +279,14 @@ class Scraper(BaseScraper):
                 "docs": "https://docs.libretro.com/library/xrick/",
             },
         }
+        # Every entry below is ours, not System.dat's: marked curated so an
+        # export of System.dat does not take it for libretro's.
         for sys_id, sys_data in EXTRA_SYSTEMS.items():
             if sys_id not in systems:
-                systems[sys_id] = sys_data
+                systems[sys_id] = {
+                    **sys_data,
+                    "files": [{**f, "curated": True} for f in sys_data["files"]],
+                }
 
         # Arcade BIOS present in the repo but absent from System.dat.
         # FBNeo expects them in system/ or system/fbneo/.
@@ -310,7 +315,7 @@ class Scraper(BaseScraper):
             existing = {f["name"] for f in systems["arcade"].get("files", [])}
             for ef in EXTRA_ARCADE_FILES:
                 if ef["name"] not in existing:
-                    systems["arcade"]["files"].append(ef)
+                    systems["arcade"]["files"].append({**ef, "curated": True})
 
         # segasp.zip for Sega System SP (Flycast)
         if "sega-dreamcast-arcade" in systems:
@@ -323,6 +328,7 @@ class Scraper(BaseScraper):
                         "name": "segasp.zip",
                         "destination": "dc/segasp.zip",
                         "required": True,
+                        "curated": True,
                     }
                 )
 
@@ -442,7 +448,7 @@ class Scraper(BaseScraper):
                 for ef in extra_files:
                     key = (ef["name"], ef.get("destination", ef["name"]))
                     if key not in existing:
-                        systems[sys_id]["files"].append(ef)
+                        systems[sys_id]["files"].append({**ef, "curated": True})
                         existing.add(key)
 
         # ep128emu shared group for Enterprise

scripts/scraper/romm_scraper.py

@@ -175,6 +175,7 @@ class Scraper(BaseScraper):
                         destination=f"{slug}/{filename}",
                         required=True,
                         native_id=slug,
+                        mirror_of=None if slug == igdb_slug else igdb_slug,
                     )
                 )