feat(debug): Add function to uniformly render debug OSError output

update-firewall-source.py

@@ -473,6 +473,28 @@ def gen_fwd_direct_scaffolding() -> lxml.builder.ElementMaker:
     return fw_rule_data
 
 
+def ose_handler(
+        os_error: OSError,
+        human_text: str = None,
+        exit_code: int = None) -> None:
+    nl = "\n"
+    log.error(f"{human_text if human_text else exit_code_desc.get(exit_code)}"
+              f"{nl}Verbatim exception was:\n"
+              f"{os_error}"
+              f"""{nl + "Exiting " + str(exit_code) + " ..." if exit_code else ""}""")
+
+
+def get_xml_str_repr() -> str:
+    global arg_fw_rule_data
+
+    fwd_direct_xml_str = lxml.etree.tostring(arg_fw_rule_data,
+                                             pretty_print=True,
+                                             encoding="UTF-8",
+                                             xml_declaration=True).decode()
+
+    return fwd_direct_xml_str
+
+
 def write_new_fwd_direct_xml(
         config_obj: configparser.ConfigParser()) -> bool:
     global arg_fw_rule_data
@@ -490,10 +512,7 @@ def write_new_fwd_direct_xml(
             fwd_file_handle.write(fwd_direct_xml_str)
             fwd_file_handle.truncate()
     except OSError as ose:
-        log.error(f"Unable to open firewalld direct rules file for updating.\n"
+        ose_handler(os_error=ose, exit_code=9)
-                  f"Verbatim exception was:\n"
-                  f"f{ose}\n"
-                  f"Exiting 9 ...")
         sys.exit(9)
     else:
         return True