SysAdmin
c12a468958
Switch from runCommand("transfer ...") to the @minecraft/server-admin
transferPlayer() function for reliable server-to-server transfers.
Enable Beta APIs experiment (gametest flag) in all 4 world level.dat files.
Add spawn protection to prevent transfer loops on arrival.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
109 lines
2.9 KiB
Python
109 lines
2.9 KiB
Python
#!/usr/bin/env python3
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"""
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Enable Beta APIs experiment in a Bedrock level.dat file.
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Bedrock level.dat format:
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- 4 bytes: version (little-endian int32)
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- 4 bytes: payload length (little-endian int32)
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- rest: uncompressed little-endian NBT payload
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This script patches the 'experiments' compound tag to add:
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- gametest = 1 (byte)
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- experiments_ever_used = 1 (byte)
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- saved_with_toggled_experiments = 1 (byte)
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Requires: amulet-nbt (pip install amulet-nbt)
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"""
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import struct
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import sys
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import shutil
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import amulet_nbt
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def patch_level_dat(path: str) -> None:
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# Read the file
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with open(path, "rb") as f:
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header = f.read(8)
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payload = f.read()
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version, length = struct.unpack("<II", header)
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print(f" Header: version={version}, payload_length={length}")
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print(f" Actual payload size: {len(payload)}")
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# Parse little-endian NBT (Bedrock format)
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nbt = amulet_nbt.load(payload, little_endian=True)
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root = nbt.compound
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# Find experiments compound
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if "experiments" not in root:
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print(" ERROR: 'experiments' compound tag not found!")
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sys.exit(1)
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experiments = root["experiments"]
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print(f" Current experiments: {dict((k, v) for k, v in experiments.items())}")
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changed = False
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# Set flags to 1
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for key in ("experiments_ever_used", "saved_with_toggled_experiments"):
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if key in experiments:
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if experiments[key].py_int == 0:
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experiments[key] = amulet_nbt.ByteTag(1)
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changed = True
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print(f" Set {key} = 1")
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else:
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experiments[key] = amulet_nbt.ByteTag(1)
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changed = True
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print(f" Added {key} = 1")
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# Add gametest experiment
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if "gametest" not in experiments:
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experiments["gametest"] = amulet_nbt.ByteTag(1)
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changed = True
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print(" Added gametest = 1")
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elif experiments["gametest"].py_int == 0:
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experiments["gametest"] = amulet_nbt.ByteTag(1)
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changed = True
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print(" Set gametest = 1")
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if not changed:
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print(" Already patched — no changes needed.")
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return
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# Serialize back (uncompressed, little-endian for Bedrock)
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new_payload = nbt.save_to(little_endian=True, compressed=False)
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# Build new header with updated length
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new_header = struct.pack("<II", version, len(new_payload))
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# Backup original
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backup_path = path + ".bak"
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shutil.copy2(path, backup_path)
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print(f" Backup saved to {backup_path}")
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# Write patched file
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with open(path, "wb") as f:
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f.write(new_header)
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f.write(new_payload)
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print(f" Patched! New payload size: {len(new_payload)}")
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def main():
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if len(sys.argv) < 2:
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print(f"Usage: {sys.argv[0]} <level.dat> [level.dat ...]")
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sys.exit(1)
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for path in sys.argv[1:]:
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print(f"\nPatching: {path}")
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patch_level_dat(path)
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print("\nDone!")
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if __name__ == "__main__":
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main()
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