set_conf: fix condition | refs #27883

utils.py

@@ -236,9 +236,10 @@ def set_conf(key: str, value: str, override: bool = False) -> bool:
     regex = re.compile(r"^" + key.upper() + "=(.*)$", flags=re.M)
     match = regex.search(conf)
     if match and override:
+        # override option
         conf = regex.sub("{}='{}'".format(key.upper(), str(value)), conf)
         state = True
-    else:
+    elif not match:
         # add option
         conf = conf + "\n{}='{}'\n".format(key.upper(), str(value))
         state = True