FIX: Restore --ignore sbref functionality (#3180)

This got lost in the shuffle.

Author: effigies

fmriprep/workflows/bold/fit.py

@@ -204,16 +204,27 @@ def init_bold_fit_wf(
 
     layout = config.execution.layout
 
+    # Fitting operates on the shortest echo
+    # This could become more complicated in the future
+    bold_file = bold_series[0]
+
     # Collect sbref files, sorted by EchoTime
     sbref_files = get_sbrefs(
         bold_series,
         entity_overrides=config.execution.get().get('bids_filters', {}).get('sbref', {}),
         layout=layout,
     )
 
-    # Fitting operates on the shortest echo
-    # This could become more complicated in the future
-    bold_file = bold_series[0]
+    basename = os.path.basename(bold_file)
+    sbref_msg = f"No single-band-reference found for {basename}."
+    if sbref_files and "sbref" in config.workflow.ignore:
+        sbref_msg = f"Single-band reference file(s) found for {basename} and ignored."
+        sbref_files = []
+    elif sbref_files:
+        sbref_msg = "Using single-band reference file(s) {}.".format(
+            ",".join([os.path.basename(sbf) for sbf in sbref_files])
+        )
+    config.loggers.workflow.info(sbref_msg)
 
     # Get metadata from BOLD file(s)
     entities = extract_entities(bold_series)