Emil
c7e86663d8
MVP checks / mvp (push) Waiting to run
Add shared Rust/WASM physics, worker meshing and diagnostics, 64-chunk full-height streaming, atlas texture support, and baseline world import. Document the current implementation and include the supplied in-game lobby screenshot.
71 lines
3.2 KiB
Python
71 lines
3.2 KiB
Python
#!/usr/bin/env python3
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"""Measure factual Java 26.2 movement through a pinned local official runtime.
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Requires the cache prepared by catalog_generate.py and an existing Java 25 JDK.
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Does not download assets or start a Minecraft server. See measurement_scope in
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the generated fixture for the precise boundary of the original-runtime probe.
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"""
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from pathlib import Path
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import argparse
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import hashlib
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import json
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import os
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import subprocess
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import zipfile
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ROOT = Path(__file__).resolve().parents[1]
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SOURCE_SHA1 = "823e2250d24b3ddac457a60c92a6a941943fcd6a"
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def digest(path, algorithm="sha256"):
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with path.open("rb") as source:
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return hashlib.file_digest(source, algorithm).hexdigest()
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def main():
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument("--java", type=Path, required=True)
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parser.add_argument("--cache", type=Path, default=ROOT / "artifacts/catalog-cache")
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parser.add_argument("--output", type=Path, default=ROOT / "artifacts/catalog-cache/physics-reference.json")
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args = parser.parse_args()
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cache = args.cache.resolve()
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source = cache / "server.jar"
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if digest(source, "sha1") != SOURCE_SHA1:
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raise SystemExit("The official source JAR does not match the pinned Java 26.2 hash")
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executable = cache / "versions/26.2/server-26.2.jar"
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with zipfile.ZipFile(source) as bundle:
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with bundle.open("META-INF/versions/26.2/server-26.2.jar") as embedded:
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expected = hashlib.file_digest(embedded, "sha256").hexdigest()
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if digest(executable) != expected:
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raise SystemExit("The cached executable differs from the verified official bundle")
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classpath = os.pathsep.join(map(str, [executable, *sorted((cache / "libraries").rglob("*.jar"))]))
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java = args.java.resolve()
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script = ROOT / "scripts/physics_reference.java"
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measured = cache / "physics-measurements.json"
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commands = [
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[str(java.with_name("javac")), "-cp", classpath, "-d", str(cache), str(script)],
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[str(java), "-Xmx1G", "-cp", str(cache) + os.pathsep + classpath, "physics_reference", str(measured)],
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]
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with (cache / "physics-measurements.log").open("w") as log:
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for command in commands:
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result = subprocess.run(command, cwd=cache, stdout=log, stderr=subprocess.STDOUT)
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if result.returncode:
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raise SystemExit(f"Reference probe failed. Read {cache / 'physics-measurements.log'}")
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fixture = json.loads(measured.read_text())
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fixture["provenance"] = {
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"source_url": f"https://piston-data.mojang.com/v1/objects/{SOURCE_SHA1}/server.jar",
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"source_sha1": SOURCE_SHA1,
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"source_sha256": digest(source),
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"executable_sha256": digest(executable),
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"probe_sha256": digest(script),
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"command": "python3 scripts/measure_physics.py --java /path/to/java25/bin/java --output crates/shacraft-physics/tests/fixtures/java26.2.json",
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"java": subprocess.run([str(java), "-version"], text=True, capture_output=True, check=True).stderr.strip(),
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}
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args.output.parent.mkdir(parents=True, exist_ok=True)
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args.output.write_text(json.dumps(fixture, indent=2) + "\n")
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print(f"Wrote {args.output}")
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if __name__ == "__main__":
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main()
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