feat: add --from-md5 lookup and pack builder

scripts/generate_pack.py

@@ -16,6 +16,7 @@ import argparse
 import hashlib
 import json
 import os
+import re
 import sys
 import tempfile
 import urllib.request
@@ -48,6 +49,96 @@ DEFAULT_OUTPUT_DIR = "dist"
 DEFAULT_BIOS_DIR = "bios"
 MAX_ENTRY_SIZE = 512 * 1024 * 1024  # 512MB
 
+_HEX_RE = re.compile(r"\b([0-9a-fA-F]{8,40})\b")
+
+
+def _detect_hash_type(h: str) -> str:
+    n = len(h)
+    if n == 40:
+        return "sha1"
+    if n == 32:
+        return "md5"
+    if n == 8:
+        return "crc32"
+    return "md5"
+
+
+def parse_hash_input(raw: str) -> list[tuple[str, str]]:
+    """Parse comma-separated hash string into (type, hash) tuples."""
+    results: list[tuple[str, str]] = []
+    for part in raw.split(","):
+        part = part.strip().lower()
+        if not part:
+            continue
+        m = _HEX_RE.search(part)
+        if m:
+            h = m.group(1)
+            results.append((_detect_hash_type(h), h))
+    return results
+
+
+def parse_hash_file(path: str) -> list[tuple[str, str]]:
+    """Parse hash file (one per line, comments with #, mixed formats)."""
+    results: list[tuple[str, str]] = []
+    with open(path) as f:
+        for line in f:
+            line = line.strip()
+            if not line or line.startswith("#"):
+                continue
+            m = _HEX_RE.search(line.lower())
+            if m:
+                h = m.group(1)
+                results.append((_detect_hash_type(h), h))
+    return results
+
+
+def lookup_hashes(
+    hashes: list[tuple[str, str]],
+    db: dict,
+    bios_dir: str,
+    emulators_dir: str,
+    platforms_dir: str,
+) -> None:
+    """Print diagnostic info for each hash."""
+    files_db = db.get("files", {})
+    by_md5 = db.get("indexes", {}).get("by_md5", {})
+    by_crc32 = db.get("indexes", {}).get("by_crc32", {})
+
+    for hash_type, hash_val in hashes:
+        sha1 = None
+        if hash_type == "sha1" and hash_val in files_db:
+            sha1 = hash_val
+        elif hash_type == "md5":
+            sha1 = by_md5.get(hash_val)
+        elif hash_type == "crc32":
+            sha1 = by_crc32.get(hash_val)
+
+        if not sha1 or sha1 not in files_db:
+            print(f"\n{hash_type.upper()}: {hash_val}")
+            print("  NOT FOUND in database")
+            continue
+
+        entry = files_db[sha1]
+        name = entry.get("name", "?")
+        md5 = entry.get("md5", "?")
+        paths = entry.get("paths", [])
+        aliases = entry.get("aliases", [])
+
+        print(f"\n{hash_type.upper()}: {hash_val}")
+        print(f"  SHA1: {sha1}")
+        print(f"  MD5:  {md5}")
+        print(f"  Name: {name}")
+        if paths:
+            print(f"  Path: {paths[0]}")
+        if aliases:
+            print(f"  Aliases: {aliases}")
+
+        primary = os.path.join(bios_dir, paths[0]) if paths else None
+        if primary and os.path.exists(primary):
+            print("  In repo: YES")
+        else:
+            print("  In repo: NO")
+
 
 def _find_candidate_satisfying_both(
     file_entry: dict,
@@ -966,6 +1057,128 @@ def generate_split_packs(
     return results
 
 
+def generate_md5_pack(
+    hashes: list[tuple[str, str]],
+    db: dict,
+    bios_dir: str,
+    output_dir: str,
+    zip_contents: dict | None = None,
+    platform_name: str | None = None,
+    platforms_dir: str | None = None,
+    emulator_name: str | None = None,
+    emulators_dir: str | None = None,
+    standalone: bool = False,
+) -> str | None:
+    """Build a pack from an explicit list of hashes with layout context."""
+    files_db = db.get("files", {})
+    by_md5 = db.get("indexes", {}).get("by_md5", {})
+    by_crc32 = db.get("indexes", {}).get("by_crc32", {})
+    if zip_contents is None:
+        zip_contents = {}
+
+    plat_file_index: dict[str, dict] = {}
+    base_dest = ""
+    plat_display = "Custom"
+    if platform_name and platforms_dir:
+        config = load_platform_config(platform_name, platforms_dir)
+        base_dest = config.get("base_destination", "")
+        plat_display = config.get("platform", platform_name)
+        for _sys_id, system in config.get("systems", {}).items():
+            for fe in system.get("files", []):
+                plat_file_index[fe.get("name", "").lower()] = fe
+
+    emu_pack_structure = None
+    emu_display = ""
+    if emulator_name and emulators_dir:
+        profiles = load_emulator_profiles(emulators_dir, skip_aliases=False)
+        if emulator_name in profiles:
+            profile = profiles[emulator_name]
+            emu_display = profile.get("emulator", emulator_name)
+            emu_pack_structure = profile.get("pack_structure")
+            for fe in profile.get("files", []):
+                plat_file_index[fe.get("name", "").lower()] = fe
+                for alias in fe.get("aliases", []):
+                    plat_file_index[alias.lower()] = fe
+
+    context_name = plat_display if platform_name else (emu_display or "Custom")
+    zip_name = f"{context_name.replace(' ', '_')}_Custom_BIOS_Pack.zip"
+    zip_path = os.path.join(output_dir, zip_name)
+    os.makedirs(output_dir, exist_ok=True)
+
+    packed: list[tuple[str, str]] = []
+    not_in_repo: list[tuple[str, str]] = []
+    not_in_db: list[str] = []
+    seen: set[str] = set()
+
+    with zipfile.ZipFile(zip_path, "w", zipfile.ZIP_DEFLATED) as zf:
+        for hash_type, hash_val in hashes:
+            sha1 = None
+            if hash_type == "sha1" and hash_val in files_db:
+                sha1 = hash_val
+            elif hash_type == "md5":
+                sha1 = by_md5.get(hash_val)
+            elif hash_type == "crc32":
+                sha1 = by_crc32.get(hash_val)
+
+            if not sha1 or sha1 not in files_db:
+                not_in_db.append(hash_val)
+                continue
+
+            entry = files_db[sha1]
+            name = entry.get("name", "")
+            aliases = entry.get("aliases", [])
+            paths = entry.get("paths", [])
+
+            dest = name
+            matched_fe = None
+            for lookup_name in [name] + aliases:
+                if lookup_name.lower() in plat_file_index:
+                    matched_fe = plat_file_index[lookup_name.lower()]
+                    break
+
+            if matched_fe:
+                if emulator_name and emu_pack_structure is not None:
+                    dest = _resolve_destination(matched_fe, emu_pack_structure, standalone)
+                else:
+                    dest = matched_fe.get("destination", matched_fe.get("name", name))
+            elif paths:
+                dest = paths[0]
+
+            if base_dest and not dest.startswith(base_dest):
+                full_dest = f"{base_dest}/{dest}"
+            else:
+                full_dest = dest
+
+            if full_dest in seen:
+                continue
+            seen.add(full_dest)
+
+            fe_for_resolve = {"name": name, "sha1": sha1, "md5": entry.get("md5", "")}
+            local_path, status = resolve_file(fe_for_resolve, db, bios_dir, zip_contents)
+
+            if status == "not_found" or not local_path:
+                not_in_repo.append((name, hash_val))
+                continue
+
+            zf.write(local_path, full_dest)
+            packed.append((name, hash_val))
+
+    total = len(hashes)
+    print(f"\nPacked {len(packed)}/{total} requested files")
+    for name, h in packed:
+        print(f"  PACKED: {name} ({h[:16]}...)")
+    for name, h in not_in_repo:
+        print(f"  NOT IN REPO: {name} ({h[:16]}...)")
+    for h in not_in_db:
+        print(f"  NOT IN DB: {h}")
+
+    if not packed:
+        if os.path.exists(zip_path):
+            os.unlink(zip_path)
+        return None
+    return zip_path
+
+
 def main():
     parser = argparse.ArgumentParser(description="Generate platform BIOS ZIP packs")
     parser.add_argument("--platform", "-p", help="Platform name (e.g., retroarch)")
@@ -997,6 +1210,10 @@ def main():
                         help="Grouping for --split (default: system)")
     parser.add_argument("--target", "-t", help="Hardware target (e.g., switch, rpi4)")
     parser.add_argument("--list-targets", action="store_true", help="List available targets for the platform")
+    parser.add_argument("--from-md5",
+                        help="Hash(es) to look up or pack (comma-separated)")
+    parser.add_argument("--from-md5-file",
+                        help="File with hashes (one per line)")
     args = parser.parse_args()
 
     if args.list:
@@ -1031,6 +1248,16 @@ def main():
     has_all = args.all
     has_emulator = bool(args.emulator)
     has_system = bool(args.system)
+    has_from_md5 = bool(args.from_md5 or getattr(args, 'from_md5_file', None))
+
+    if args.from_md5 and getattr(args, 'from_md5_file', None):
+        parser.error("--from-md5 and --from-md5-file are mutually exclusive")
+    if has_from_md5 and has_all:
+        parser.error("--from-md5 requires --platform or --emulator, not --all")
+    if has_from_md5 and has_system:
+        parser.error("--from-md5 and --system are mutually exclusive")
+    if has_from_md5 and args.split:
+        parser.error("--split and --from-md5 are mutually exclusive")
 
     # --platform/--all and --system can combine (system filters within platform)
     # --emulator is exclusive with everything else
@@ -1038,8 +1265,8 @@ def main():
         parser.error("--emulator is mutually exclusive with --platform, --all, and --system")
     if has_platform and has_all:
         parser.error("--platform and --all are mutually exclusive")
-    if not (has_platform or has_all or has_emulator or has_system):
-        parser.error("Specify --platform, --all, --emulator, or --system")
+    if not (has_platform or has_all or has_emulator or has_system or has_from_md5):
+        parser.error("Specify --platform, --all, --emulator, --system, or --from-md5")
     if args.standalone and not (has_emulator or (has_system and not has_platform and not has_all)):
         parser.error("--standalone requires --emulator or --system (without --platform)")
     if args.split and not (has_platform or has_all):
@@ -1053,6 +1280,32 @@ def main():
     if args.target and has_emulator:
         parser.error("--target is incompatible with --emulator")
 
+    # Hash lookup / pack mode
+    if has_from_md5:
+        if args.from_md5:
+            hashes = parse_hash_input(args.from_md5)
+        else:
+            hashes = parse_hash_file(args.from_md5_file)
+        if not hashes:
+            print("No valid hashes found in input", file=sys.stderr)
+            sys.exit(1)
+        db = load_database(args.db)
+        if not has_platform and not has_emulator:
+            lookup_hashes(hashes, db, args.bios_dir, args.emulators_dir,
+                         args.platforms_dir)
+            return
+        zip_contents = build_zip_contents_index(db)
+        result = generate_md5_pack(
+            hashes=hashes, db=db, bios_dir=args.bios_dir,
+            output_dir=args.output_dir, zip_contents=zip_contents,
+            platform_name=args.platform, platforms_dir=args.platforms_dir,
+            emulator_name=args.emulator, emulators_dir=args.emulators_dir,
+            standalone=getattr(args, "standalone", False),
+        )
+        if not result:
+            sys.exit(1)
+        return
+
     db = load_database(args.db)
     zip_contents = build_zip_contents_index(db)