Warn on bad rendering options in JobInputFile.

law/job/base.py

@@ -1324,7 +1324,6 @@ def __init__(self, path, copy=None, share=None, forward=None, increment=None, po
             render_local = maybe_set(render_local, False)
 
         # store attributes, apply residual defaults
-        # TODO: move to job rendering by default
         self.path = os.path.abspath(os.path.expandvars(os.path.expanduser(get_path(path))))
         self.copy = True if copy is None else bool(copy)
         self.share = False if share is None else bool(share)
@@ -1356,7 +1355,7 @@ def __init__(self, path, copy=None, share=None, forward=None, increment=None, po
                 "but rendering is enabled which has no effect".format(self.path),
             )
         if self.share and self.render_local:
-            logger.warning(
+            logger.error(
                 "input file at {} is configured to be shared across jobs but local rendering is "
                 "active, potentially resulting in wrong file content".format(self.path),
             )
@@ -1365,6 +1364,11 @@ def __init__(self, path, copy=None, share=None, forward=None, increment=None, po
                 "input file at {} is configured to be rendered locally and within the job, which "
                 "is likely unnecessary".format(self.path),
             )
+        if not self.render_local and not self.render_job:
+            logger.error(
+                "input file at {} is configured not to be rendered at all, which will most likely "
+                "cause errors on remote worker nodes".format(self.path),
+            )
 
         # different path variants as seen by jobs
         self.path_sub_abs = None