chore: import upstream snapshot with attribution

python/tests/commands/builtin/generic_bind/test_readonly_fallbacks.py

@@ -0,0 +1,94 @@
+# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
+
+from functools import partial
+
+import pytest
+
+from mirage.commands.builtin.generic_bind.adapter import CommandIO
+from mirage.commands.builtin.generic_bind.builders.du import du as du_builder
+from mirage.commands.builtin.generic_bind.builders.find import \
+    find as find_builder
+from mirage.commands.builtin.utils.wrap import stream_from_bytes
+from mirage.io.types import materialize
+from mirage.types import FileStat, FileType, PathSpec
+
+_FILES = {
+    "/g/a.txt": b"alpha\n",
+    "/g/sub/b.txt": b"bravo\n",
+}
+_DIRS = {"/g", "/g/sub"}
+
+
+async def _readdir(accessor, path, index=None):
+    base = (path.virtual if isinstance(path, PathSpec) else path).rstrip("/")
+    out = []
+    for p in list(_FILES) + sorted(_DIRS):
+        parent = p.rsplit("/", 1)[0] or "/"
+        if parent == base and p != base:
+            out.append(p)
+    return out
+
+
+async def _stat(accessor, path, index=None):
+    p = path.virtual if isinstance(path, PathSpec) else path
+    p = p.rstrip("/") or "/"
+    if p in _DIRS:
+        return FileStat(name=p.rsplit("/", 1)[-1], type=FileType.DIRECTORY)
+    if p in _FILES:
+        return FileStat(name=p.rsplit("/", 1)[-1],
+                        size=len(_FILES[p]),
+                        type=FileType.TEXT)
+    raise FileNotFoundError(p)
+
+
+async def _read(accessor, path, index=None):
+    p = path.virtual if isinstance(path, PathSpec) else path
+    return _FILES[p.rstrip("/")]
+
+
+def _ops() -> CommandIO:
+    return CommandIO(
+        readdir=_readdir,
+        read_bytes=_read,
+        read_stream=partial(stream_from_bytes, _read),
+        stat=_stat,
+        is_mounted=lambda a: True,
+        local=False,
+    )
+
+
+def _spec(original: str) -> PathSpec:
+    return PathSpec(resource_path=(original).strip("/"),
+                    virtual=original,
+                    directory=original,
+                    resolved=True)
+
+
+@pytest.mark.asyncio
+async def test_find_walks_tree_without_native_find_op():
+    out, io = await find_builder(_ops(), object(), [_spec("/g")], type="f")
+    text = (await materialize(out)).decode()
+    assert "/g/a.txt" in text
+    assert "/g/sub/b.txt" in text
+    assert io.exit_code == 0
+
+
+@pytest.mark.asyncio
+async def test_du_walks_tree_without_native_du_op():
+    out, _ = await du_builder(_ops(), object(), [_spec("/g")], s=True)
+    text = (await materialize(out)).decode()
+    # alpha\n (6) + bravo\n (6) = 12 bytes summed by the readdir walk.
+    assert "12" in text
+    assert "/g" in text