Rebuild local Blender WASM environment and recovery evidence

tools/web/check-wbv2-p0-003-desktop.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+import hashlib
+import json
+import os
+import pathlib
+import sys
+import tempfile
+
+import bpy
+
+
+CONTRACT_TEXT_NAME = "WBV2-P0-003-CapabilityContract"
+
+
+def read_contract():
+    text = bpy.data.texts.get(CONTRACT_TEXT_NAME)
+    if text is None:
+        raise RuntimeError("CAPABILITY_CONTRACT_INVALID: contract text is missing")
+    source = text.as_string()
+    contract = json.loads(source)
+    return source, contract
+
+
+def main():
+    arguments = sys.argv[sys.argv.index("--") + 1 :]
+    if len(arguments) != 2:
+        raise SystemExit("usage: blender -b --python check-wbv2-p0-003-desktop.py -- FIXTURE REPORT")
+    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
+    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
+    source, before = read_contract()
+    descriptor, temporary = tempfile.mkstemp(prefix="wbv2-p0-003-reopen-", suffix=".blend", dir=fixture.parent)
+    os.close(descriptor)
+    try:
+        bpy.ops.wm.save_as_mainfile(filepath=temporary, check_existing=False, compress=True)
+        bpy.ops.wm.open_mainfile(filepath=temporary, load_ui=False)
+        after_source, after = read_contract()
+    finally:
+        pathlib.Path(temporary).unlink(missing_ok=True)
+    if before != after or source != after_source:
+        raise RuntimeError("CAPABILITY_CONTRACT_INVALID: desktop save/reopen drift")
+    value = {
+        "schemaVersion": 1,
+        "task": "WBV2-P0-003",
+        "operation": "CAPABILITY_ERROR_BUDGET_CONTRACT_DESKTOP",
+        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
+        "contract": after,
+        "sourceSha256": hashlib.sha256(after_source.encode("utf-8")).hexdigest(),
+        "saveReopen": "EXACT",
+        "blenderVersion": bpy.app.version_string,
+    }
+    output.parent.mkdir(parents=True, exist_ok=True)
+    output.write_text(json.dumps(value, indent=2, sort_keys=True) + "\n", encoding="utf-8")
+    print(f"wbv2-p0-003-desktop-ok contract={after['contractId']} schemaHash={after['schemaHash']} saveReopen=exact")
+
+
+if __name__ == "__main__":
+    main()