Fix mount points conflict causing empty project DLL in research environment (#541)

* chore: exclude .python-version for git tracking

* fix: mount points conflict by LeanCLI and NoteBooks directory

* test: check both mount points available

* chore: add explanation for the test issue

* fix: use Assembly.LoadFrom(<csproj_name>) in Initialize.csx for research to keep consistent with docs

* Minor unit test fix

---------

Co-authored-by: Jhonathan Abreu <[email protected]>

Author: efJerryYang

Diff for: .gitignore

@@ -88,7 +88,7 @@ ipython_config.py
 # pyenv
 #   For a library or package, you might want to ignore these files since the code is
 #   intended to run in multiple environments; otherwise, check them in:
-# .python-version
+.python-version
 
 # pipenv
 #   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.

Diff for: lean/commands/research.py

@@ -149,6 +149,14 @@ def research(project: Path,
                                                       research_image,
                                                       paths_to_mount)
 
+    # Mount project dir to the Notebooks directory first, avoid using volumes to prevent overwriting mounting logic for /LeanCLI
+    run_options["mounts"].append(Mount(
+        target=f"{LEAN_ROOT_PATH}/Notebooks",
+        source=str(project),
+        type="bind",
+        read_only=False
+    ))
+
     # Mount the config in the notebooks directory as well
     local_config_path = next(m["Source"] for m in run_options["mounts"] if m["Target"].endswith("config.json"))
     run_options["mounts"].append(Mount(target=f"{LEAN_ROOT_PATH}/Notebooks/config.json",
@@ -166,12 +174,6 @@ def research(project: Path,
     # Make Ctrl+C stop Jupyter Lab immediately
     run_options["stop_signal"] = "SIGKILL"
 
-    # Mount the project to the notebooks directory
-    run_options["volumes"][str(project)] = {
-        "bind": f"{LEAN_ROOT_PATH}/Notebooks",
-        "mode": "rw"
-    }
-
     # Allow notebooks to be embedded in iframes
     run_options["commands"].append("mkdir -p ~/.jupyter")
     run_options["commands"].append(

Diff for: tests/commands/test_research.py

@@ -280,3 +280,43 @@ def test_research_runs_lean_container_with_paths_to_mount() -> None:
 
     assert mount is not None
     assert mount["Target"] == "/Files/file.json"
+
+def test_research_mounts_project_directory_to_leancli_and_notebooks() -> None:
+    create_fake_lean_cli_directory()
+
+    docker_manager = mock.MagicMock()
+    container.initialize(docker_manager)
+
+    project_dir = Path.cwd() / "CSharp Project"
+    (project_dir / "Main.cs").touch()
+    original_csproj = project_dir / "CSharp Project.csproj"
+    original_csproj.write_text("""
+<Project>
+    <PropertyGroup></PropertyGroup>
+    <ItemGroup>
+        <PackageReference Include="QuantConnect.Lean.Engine" Version="2.5.*" />
+    </ItemGroup>
+</Project>""")
+
+    result = CliRunner().invoke(lean, ["research", "CSharp Project"])
+
+    assert result.exit_code == 0
+
+    docker_manager.run_image.assert_called_once()
+    args, kwargs = docker_manager.run_image.call_args
+
+    leancli_volume = next(((k, v) for (k, v) in kwargs["volumes"].items() if v['bind'] == f"/LeanCLI"), None)
+    notebooks_mount = next((m for m in kwargs["mounts"] if m["Target"] == f"{LEAN_ROOT_PATH}/Notebooks"), None)
+
+    assert leancli_volume is not None, "/LeanCLI is not mounted"
+    assert notebooks_mount is not None, "/Notebooks is not mounted"
+    assert leancli_volume[0] == str(project_dir)
+    assert notebooks_mount["Source"] == str(project_dir)
+
+    temp_csproj_mounts = [
+        m for m in kwargs["mounts"]
+        if m["Target"].startswith(f"/LeanCLI") and m["Target"].endswith(".csproj")
+    ]
+
+    assert len(temp_csproj_mounts) > 0, "No temporary csproj file mounts detected"
+    assert all(m["Source"] != str(original_csproj) for m in temp_csproj_mounts), "Temporary csproj did not correctly overwrite user file"