Just hack that overlay + CI env variable seems to be fine :/

Author: seberg

cuda_bindings/tests/test_cufile.py

@@ -90,11 +90,14 @@ def skipIfUnsupportedFilesystem(tmpdir_factory):
     cmd = ["findmnt", "-no", "FSTYPE", "-T", tmpdir_factory.getbasetemp()]
     fs_type = subprocess.check_output(cmd, text=True).strip()  # noqa: S603
     logging.info(f"Current filesystem type (findmnt): {fs_type}")
-    # tmpfs is supported since 13.2 (probably), 1.18 definitely seems fine:
-    if cufileVersionLessThan(1180):
-        supported_fs_types = ("ext4", "xfs")
-    else:
-        supported_fs_types = ("ext4", "xfs", "tmpfs")
+
+    if fs_type == "overlay" and os.environ.get("CI") is not None:
+        # Things seems to be fine on CI tmpfiles which report as "overlay".
+        # (Previously the build folder reporting as ext4 was not fine, though.)
+        return
+
+    # Newer versions may actuall support more (e.g. tmpfs)
+    supported_fs_types = ("ext4", "xfs")
     if fs_type not in supported_fs_types:
         pytest.skip(f"cuFile handle_register does not support filesystem: {fs_type}")