Update things.

xcp_d/utils/bids.py

@@ -659,7 +659,7 @@ def collect_run_data(layout, bold_file, cifti, primary_anat, target_space):
     return run_data
 
 
-def write_dataset_description(fmri_dir, xcpd_dir):
+def write_dataset_description(fmri_dir, xcpd_dir, custom_confounds_folder=None):
     """Write dataset_description.json file for derivatives.
 
     Parameters
@@ -711,6 +711,12 @@ def write_dataset_description(fmri_dir, xcpd_dir):
 
     dset_desc["DatasetLinks"]["xcp_d"] = str(xcpd_dir)
 
+    if custom_confounds_folder:
+        if "custom_confounds" in dset_desc["DatasetLinks"].keys():
+            LOGGER.warning("'custom_confounds' is already a dataset link. Overwriting.")
+
+        dset_desc["DatasetLinks"]["custom_confounds"] = str(custom_confounds_folder)
+
     xcpd_dset_description = os.path.join(xcpd_dir, "dataset_description.json")
     if os.path.isfile(xcpd_dset_description):
         with open(xcpd_dset_description, "r") as fo:

xcp_d/workflows/outputs.py

@@ -282,6 +282,8 @@ def init_postproc_derivatives_wf(
     )
 
     def _postproc_to_source(out_file, output_dir):
+        import os
+
         from xcp_d.utils.utils import _out_file_to_source
 
         return _out_file_to_source(out_file, "xcp_d", os.path.join(output_dir, "xcp_d"))