fix: ensure relative path works within bento project

src/_bentoml_impl/loader.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import importlib
+import os
 import pathlib
 import sys
 import typing as t
@@ -89,8 +90,8 @@ def normalize_identifier(
             with open(yaml_path, "r") as f:
                 bento_yaml = yaml.safe_load(f)
             assert "service" in bento_yaml, "service field is required in bento.yaml"
-            return normalize_package(bento_yaml["service"]), yaml_path.parent.joinpath(
-                "src"
+            return normalize_package(bento_yaml["service"]), pathlib.Path(
+                bento.path_of("src")
             )
     else:
         raise ValueError(f"invalid service: {service_identifier}")
@@ -123,18 +124,23 @@ def import_service(
         extra_python_path = None
 
     # patch model store if needed
-    if (
-        bento_path.parent.joinpath(BENTO_YAML_FILENAME).exists()
-        and bento_path.parent.joinpath("models").exists()
-    ):
+    if (bento_parent_dir := bento_path.parent).joinpath(
+        BENTO_YAML_FILENAME
+    ).exists() and bento_parent_dir.joinpath("models").exists():
         from bentoml._internal.models import ModelStore
 
+        original_path = os.getcwd()
         original_model_store = BentoMLContainer.model_store.get()
+        # cwd into this for relative path to work
+        os.chdir(bento_parent_dir.absolute())
+
+        # check in bento source
 
         BentoMLContainer.model_store.set(
-            ModelStore((bento_path.parent.joinpath("models").absolute()))
+            ModelStore((bento_parent_dir.joinpath("models").absolute()))
         )
     else:
+        original_path = None
         original_model_store = None
 
     # load model aliases
@@ -179,6 +185,10 @@ def import_service(
             from bentoml._internal.configuration.containers import BentoMLContainer
 
             BentoMLContainer.model_store.set(original_model_store)
+
+        if original_path is not None:
+            os.chdir(original_path)
+
         from bentoml.exceptions import ImportServiceError
 
         raise ImportServiceError(

src/bentoml/_internal/bento/bento.py

@@ -257,6 +257,8 @@ def create(
             )
         bento_fs.makedir(BENTO_PROJECT_DIR_NAME)
         target_fs = bento_fs.opendir(BENTO_PROJECT_DIR_NAME)
+        with target_fs.open(DEFAULT_BENTO_BUILD_FILE, "w") as bentofile_yaml:
+            build_config.to_yaml(bentofile_yaml)
         ignore_specs = list(specs.from_path(build_ctx))
 
         for dir_path, _, files in ctx_fs.walk():

tests/unit/_internal/bento/test_bento.py

@@ -362,6 +362,7 @@ def test_bento(model_store: ModelStore):
         assert set(bento_fs.listdir("src")) == {
             "simplebento.py",
             "subdir",
+            "bentofile.yaml",
             ".bentoignore",
         }
         assert set(bento_fs.listdir("src/subdir")) == {"somefile"}