freebsd: introduce the freebsd renderer (#61)
* freebsd: introduce the freebsd renderer
Refactoring of the FreeBSD code base to provide a real network renderer
for FreeBSD.
Use the generic update_sysconfig_file() from rhel_util to handle the
access to /etc/rc.conf.
Interfaces are not automatically renamed by FreeBSD using
the following configuration in /etc/rc.conf:
```
ifconfig_fxp0_name="eth0"
```
* freesd: use regex named groups
Reduce the complexity of `get_interfaces_by_mac_on_freebsd()` with
named groups.
* freebsd: breaks up _write_network() in tree small functions
- `_write_ifconfig_entries()`
- `_write_route_entries()`
- `_write_resolve_conf()`
* extend find_fallback_nic() to support FreeBSD
this uses `route -n show default` to find the default interface
* freebsd: use dns keys from NetworkState class
The NetworkState class (settings instance) exposes the DNS configuration
in two keys:
- `dns_nameservers`
- `dns_searchdomains`
On OpenStack, these keys are set when a global DNS server is set. The
alternative is the `dns_nameservers` and `dns_search` keys from each
subdomain. We continue to read those.
* freebsd: properly target the /etc/resolv.conf file
* freebsd: ignore 'service routing restart' ret code
On FreeBSD 10, the restart of routing and dhclient is likely to fail because
- routing: it cannot remove the loopback route, but it will still set up
the default route as expected.
- dhclient: it cannot stop the dhclient started by the netif service.
In both case, the situation is ok, and we can proceed.
* freebsd: handle case when metadata MAC local locally
Handle the case where the metadata configuration comes with a MAC that
does not exist locally.
See:
- https://github.com/canonical/cloud-init/pull/61/files/635ce14b3153934ba1041be48b7245062f21e960#r359600604
- https://github.com/canonical/cloud-init/pull/61/files/635ce14b3153934ba1041be48b7245062f21e960#r359600966
* freebsd: show up a warning if several subnet found
The FreeBSD provider currently only allow one subnet per interface.
* freebsd: honor the target parameter in _write_network
* freebsd: log when a bad route is found
* freebsd: pass _postcmds to start_services()
* freebsd: updatercconf() is depercated
Replace `updatercconf()` by `rhel_util.update_sysconfig_file()`.
* freebsd: ensure gateway is ipv4 before using it
With the legacy ENI format, an IPv6 gateway may be pushed. This instead
of the expected IPv4.
* freebsd: find_fallback_nic, support FB10
On FreeBSD <= 10, `ifconfig -l` ignores the down interfaces.
* freebsd: use util.target_path() to load resolv.conf
Ensure we access `/etc/resolv.conf`, not `etc/resolv.conf`.
* freebsd: skip subnet without netmask
Those are likely to be either invalid of in IPv6 format. IPv6 support
will be addressed later in a new patchset.
* freebsd: get_devicelist returns netif list
Ensure `get_devicelist()` returns the list of known netif on FreeBSD.
* replace rhel_util.update_sysconfig_file wrapper call, with a wrapper function
* reverse if condition to remove an indent
Co-authored-by: Igor Galić <email address hidden>
