feat: resolve relative datasample spec path

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Paths are now resolved on DatasampleSpec objects. Which means that users can pass relative paths ([#392](https://github.com/Substra/substra/pull/392))
+
 ## [0.49.0](https://github.com/Substra/substra/releases/tag/0.49.0) - 2023-10-18
 
 ### Added

substra/sdk/schemas.py

@@ -147,14 +147,31 @@ def is_many(self):
         return self.paths and len(self.paths) > 0
 
     @pydantic.model_validator(mode="before")
-    def exclusive_paths(cls, values):  # noqa: N805
+    def exclusive_paths(cls, values: typing.Any) -> typing.Any:  # noqa: N805
         """Check that one and only one path(s) field is defined."""
         if "paths" in values and "path" in values:
             raise ValueError("'path' and 'paths' fields are exclusive.")
         if "paths" not in values and "path" not in values:
             raise ValueError("'path' or 'paths' field must be set.")
         return values
 
+    @pydantic.model_validator(mode="before")
+    def resolve_paths(cls, values: typing.Any) -> typing.Any:  # noqa: N805
+        """Resolve given path is relative."""
+        if "paths" in values:
+            paths = []
+            for path in values["paths"]:
+                path = pathlib.Path(path)
+                paths.append(path.resolve())
+
+            values["paths"] = paths
+
+        elif "path" in values:
+            path = pathlib.Path(values["path"])
+            values["path"] = path.resolve()
+
+        return values
+
     @contextlib.contextmanager
     def build_request_kwargs(self, local):
         # redefine kwargs builder to handle the local paths

tests/sdk/test_schemas.py

@@ -0,0 +1,20 @@
+import pathlib
+import uuid
+
+import pytest
+
+from substra.sdk.schemas import DataSampleSpec
+
+
+@pytest.mark.parametrize("path", [pathlib.Path() / "data", "./data", pathlib.Path().cwd() / "data"])
+def test_datasample_spec_resolve_path(path):
+    datasample_spec = DataSampleSpec(path=path, data_manager_keys=[str(uuid.uuid4())])
+
+    assert datasample_spec.path == pathlib.Path().cwd() / "data"
+
+
+def test_datasample_spec_resolve_paths():
+    paths = [pathlib.Path() / "data", "./data", pathlib.Path().cwd() / "data"]
+    datasample_spec = DataSampleSpec(paths=paths, data_manager_keys=[str(uuid.uuid4())])
+
+    assert all([path == pathlib.Path().cwd() / "data" for path in datasample_spec.paths])