config: Keep known options defined on CLI

If the validation or dumping script is given some options, they should
only be removed if they are not valid. We have to remove the invalid
ones, otherwise that would cause a warning about unknown options.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi_utils/config_utils.py

@@ -3,6 +3,8 @@
 import argparse
 import re
 
+from pungi.checks import make_schema
+
 
 def validate_definition(value):
     """Check that the variable name is a valid Python variable name, and that
@@ -18,3 +20,11 @@ def validate_definition(value):
 def extract_defines(args):
     """Given an iterable of "key=value" strings, parse them into a dict."""
     return dict(var.split("=", 1) for var in args)
+
+
+def remove_unknown(conf, keys):
+    """Remove given keys from the config unless they are known Pungi options."""
+    schema = make_schema()
+    for key in keys:
+        if key not in schema["properties"]:
+            del conf[key]