From a758173dfabf60392de4e7c7cbfa317f2c02bb9a Mon Sep 17 00:00:00 2001
From: Gauthier BERTHOMIEU <gauthier.berthomieu@ensta.fr>
Date: Wed, 21 Oct 2026 18:06:29 +0200
Subject: [PATCH 1/4] add failing test for serialize path with symlink

---
 tests/test_serialization.py | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/tests/test_serialization.py b/tests/test_serialization.py
index 9bded198..da8d86aa 100644
--- a/tests/test_serialization.py
+++ b/tests/test_serialization.py
@@ -1052,14 +1052,24 @@ def test_spectro_dataset_serialization(
 """
 
 
-def can_symlink(tmp_path: Path) -> bool:
+def test_serialize_path_with_symlink(tmp_path: Path) -> None:
+    real_root = tmp_path / "cocteau"
+    real_root.mkdir(parents=True, exist_ok=True)
+
+    alias_root = tmp_path / "twins"
+
     try:
-        test_link = tmp_path / "link_test"
-        test_link.symlink_to(tmp_path)
-        test_link.unlink()
-    except OSError:
-        return False
-    return True
+        alias_root.symlink_to(real_root)
+    except (OSError, NotImplementedError) as e:
+        pytest.skip(f"Symlink not permitted on this system:\n{e}")
+
+    target = "serpentskirt"
+
+    target_path = alias_root / target
+
+    result = _serialize_path(value=target_path, root_path=real_root)
+
+    assert result == target
 
 
 def test_path_anchor() -> None:

From 315683011269f50036f6fed2bc18e898336fe563 Mon Sep 17 00:00:00 2001
From: Gauthier BERTHOMIEU <gauthier.berthomieu@ensta.fr>
Date: Wed, 21 Oct 2026 18:07:57 +0200
Subject: [PATCH 2/4] fix serialize_path() with relative paths that include
 symlinks

---
 src/osekit/core/json_serializer.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/osekit/core/json_serializer.py b/src/osekit/core/json_serializer.py
index fdbfc8b9..9770a799 100644
--- a/src/osekit/core/json_serializer.py
+++ b/src/osekit/core/json_serializer.py
@@ -64,7 +64,10 @@ def _serialize_path(value: Path, root_path: Path) -> str:
         # Path is outside the project: we store it as an absolute path.
         return value.as_posix()
     try:
-        return Path(os.path.relpath(path=value, start=root_path)).as_posix()
+        # Return value relative to the root_path
+        return Path(
+            os.path.relpath(path=value.resolve(), start=root_path.resolve())
+        ).as_posix()
     except ValueError:
         # Value is not expressible as relative to root
         return value.as_posix()

From dacf3b3260bcf25b1e6ea7257a0db00b9faeae3d Mon Sep 17 00:00:00 2001
From: Gauthier BERTHOMIEU <gauthier.berthomieu@ensta.fr>
Date: Wed, 21 Oct 2026 18:15:22 +0200
Subject: [PATCH 3/4] add failing test for _serialize_path with symlinked
 anchor

---
 tests/test_serialization.py | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/tests/test_serialization.py b/tests/test_serialization.py
index da8d86aa..385ba7ff 100644
--- a/tests/test_serialization.py
+++ b/tests/test_serialization.py
@@ -1052,7 +1052,8 @@ def test_spectro_dataset_serialization(
 """
 
 
-def test_serialize_path_with_symlink(tmp_path: Path) -> None:
+@pytest.fixture
+def create_symlink(tmp_path: Path) -> tuple[Path, Path]:
     real_root = tmp_path / "cocteau"
     real_root.mkdir(parents=True, exist_ok=True)
 
@@ -1063,6 +1064,15 @@ def test_serialize_path_with_symlink(tmp_path: Path) -> None:
     except (OSError, NotImplementedError) as e:
         pytest.skip(f"Symlink not permitted on this system:\n{e}")
 
+    return real_root, alias_root
+
+
+def test_serialize_path_with_symlink(
+    tmp_path: Path,
+    create_symlink: tuple[Path, Path],
+) -> None:
+    real_root, alias_root = create_symlink
+
     target = "serpentskirt"
 
     target_path = alias_root / target
@@ -1146,6 +1156,21 @@ def test_serialize_path_within_anchor(tmp_path: Path) -> None:
         assert _serialize_path(value=value, root_path=root_path) == expected
 
 
+def test_serialize_path_within_anchor_with_symlink(
+    tmp_path: Path, create_symlink: tuple[Path, Path]
+) -> None:
+    real_root, alias_root = create_symlink
+
+    target = "fun"
+
+    value = alias_root / target
+
+    with path_anchor(anchor=real_root):
+        # Anchor is real_root, which should also be alias_root
+        # So the path should be serialized as relative
+        assert _serialize_path(value=value, root_path=alias_root) == target
+
+
 def test_serialize_path_outside_anchor(tmp_path: Path) -> None:
     value = tmp_path / "fun" / "top.wav"
     anchor = tmp_path / "cool"

From 19ef02aa1437f051d3deacefa10bef72a863170f Mon Sep 17 00:00:00 2001
From: Gauthier BERTHOMIEU <gauthier.berthomieu@ensta.fr>
Date: Wed, 21 Oct 2026 18:15:40 +0200
Subject: [PATCH 4/4] fix _serialize_path with symlinked anchor

---
 src/osekit/core/json_serializer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/osekit/core/json_serializer.py b/src/osekit/core/json_serializer.py
index 9770a799..52b50dac 100644
--- a/src/osekit/core/json_serializer.py
+++ b/src/osekit/core/json_serializer.py
@@ -60,7 +60,7 @@ def _serialize_path(value: Path, root_path: Path) -> str:
         return str(value)
 
     anchor = _anchor.get()
-    if anchor is not None and not value.is_relative_to(anchor):
+    if anchor is not None and not value.resolve().is_relative_to(anchor.resolve()):
         # Path is outside the project: we store it as an absolute path.
         return value.as_posix()
     try: