Complete M16 asset operator parity chain

tools/web/check-action-asset-download-desktop.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python3
+import hashlib
+import json
+import pathlib
+import sys
+import tempfile
+
+import bpy
+
+
+IMAGE_NAME = "WebGapAssetDownloadImage"
+
+
+def image_state():
+    image = bpy.data.images.get(IMAGE_NAME)
+    if image is None:
+        raise RuntimeError("asset download fixture image is missing")
+    return {
+        "name": image.name,
+        "filepath": image.filepath,
+        "source": image.source,
+        "packed": image.packed_file is not None,
+        "size": [int(image.generated_width), int(image.generated_height)],
+    }
+
+
+def main():
+    arguments = sys.argv[sys.argv.index("--") + 1 :]
+    if len(arguments) != 2:
+        raise SystemExit("usage: blender -b --python check-action-asset-download-desktop.py -- FIXTURE REPORT")
+    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
+    output.unlink(missing_ok=True)
+    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
+    bpy.context.preferences.system.use_online_access = True
+    before = image_state()
+    poll = bool(bpy.ops.asset.asset_download.poll())
+    try:
+        bpy.ops.asset.asset_download(relative_asset_identifier="WebGapAssetDownload")
+    except RuntimeError as error:
+        if "Asset could not be found" not in str(error):
+            raise
+        operator_status = "CANCELLED"
+    else:
+        raise RuntimeError("asset.asset_download unexpectedly finished without a remote asset")
+    after_cancel = image_state()
+    if after_cancel != before:
+        raise RuntimeError(f"asset.asset_download cancellation changed Main data: {before} != {after_cancel}")
+
+    with tempfile.NamedTemporaryFile(prefix="m16-asset-download-reopen-", suffix=".blend", dir=fixture.parent) as temporary:
+        bpy.ops.wm.save_as_mainfile(filepath=temporary.name, check_existing=False, compress=True)
+        bpy.ops.wm.open_mainfile(filepath=temporary.name, load_ui=False)
+        after = image_state()
+    if after != before:
+        raise RuntimeError(f"asset.asset_download save/reopen drift: {before} != {after}")
+    report = {
+        "schemaVersion": 1,
+        "task": "M16-GAP-00264",
+        "operation": "ASSET_ASSET_DOWNLOAD_DESKTOP",
+        "fixture": str(fixture),
+        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
+        "before": before,
+        "after": after,
+        "poll": poll,
+        "operatorStatus": operator_status,
+        "mainMutation": "NONE",
+        "saveReopen": "EXACT",
+        "blenderVersion": bpy.app.version_string,
+    }
+    output.parent.mkdir(parents=True, exist_ok=True)
+    output.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
+    print("asset-asset-download-desktop-ok status=CANCELLED mainMutation=none saveReopen=exact")
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except Exception as error:
+        print(f"asset-asset-download-desktop-failed: {error}")
+        raise SystemExit(1)