Unbundle covers: fetch psppt-covers.zip from repo on demand with user prompt

scripts/make-covers-bundle.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+"""Package the offline cover zips into a single distributable bundle.
+
+Outputs ``psppt-covers.zip`` containing ``libretro-covers.zip`` and
+``openvgdb-covers.zip``. Attach it to the Gitea ``covers`` release; the app
+downloads it on first run when the user opts in.
+
+Usage:  python3 scripts/make-covers-bundle.py [out-path]
+"""
+import sys
+import zipfile
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+COVERS = ROOT / "data" / "covers"
+INNER = ("libretro-covers.zip", "openvgdb-covers.zip")
+
+
+def main(argv):
+    out = Path(argv[1]) if len(argv) > 1 else ROOT / "psppt-covers.zip"
+    missing = [n for n in INNER if not (COVERS / n).exists()]
+    if missing:
+        print(f"missing: {', '.join(missing)} in {COVERS}", file=sys.stderr)
+        return 2
+    # Inner zips are already compressed; store them to avoid recompressing.
+    with zipfile.ZipFile(out, "w", zipfile.ZIP_STORED) as z:
+        for n in INNER:
+            print(f"adding {n} …")
+            z.write(COVERS / n, arcname=n)
+    size = out.stat().st_size / (1 << 20)
+    print(f"wrote {out} ({size:.0f} MB)")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main(sys.argv))