Description Philipp Hahn 2024-01-31 09:12:47 CET

I was investigating a BIND9 zone file and opened it in `vim`, which creates a temporary file in /etc/bind/univention.conf.d/.
I then triggered some zone change, which included  in `/etc/bind/univention.conf`:
> include "/etc/bind/univention.conf.d/.256.in-addr.arpa.swp";

That change also triggered a reload of BIND9, which then crashed and failed to start again:
```
Jan 31 05:33:06 dc20 named[20315]: loading configuration from '/etc/bind/named.conf'
Jan 31 05:33:06 dc20 named[20315]: /etc/bind/univention.conf.d/.256.in-addr.arpa.swp:1: unknown option 'b0VIM'
```

This is caused by `services/univention-bind/bind.py:postrun()`:
```python
365             for f in os.listdir(NAMED_CONF_DIR):
366                 if not f.endswith('.proxy'):
367                     named_conf.write('include "%s";\n' % _quote_config_parameter(os.path.join(NAMED_CONF_DIR, f)))                                                                                                                      
368                 else:
369                     proxy_conf.write('include "%s";\n' % _quote_config_parameter(os.path.join(NAMED_CONF_DIR, f)))
```

`listdir()` returns all files including "hidden files".