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# replace MTU with value from configuration
# get MTU value via Python
# as configuration is not available to cli-shell-api at the first boot, we must use vyos.config, which contain workaround for this, instead clean shell
function get_mtu {
python3 - <<PYEND
from vyos.config import Config
import os
import re
# check if interface is not VLAN and fix name if necessary
interface_name = os.getenv('interface', '')
regex_filter = re.compile('^(?P<interface>\w+)\.(?P<vid>\d+)$')
if regex_filter.search(interface_name):
iface = regex_filter.search(interface_name).group('interface')
vid = regex_filter.search(interface_name).group('vid')
interface_name = "{} vif {}".format(iface, vid)
# initialize config
config = Config()
if config.exists('interfaces'):
iface_types = config.list_nodes('interfaces')
for iface_type in iface_types:
# check if configuration contain MTU value for interface and return (print) it
if config.exists("interfaces {} {} mtu".format(iface_type, interface_name)):
print(format(config.return_value("interfaces {} {} mtu".format(iface_type, interface_name))))
PYEND
}
# check if DHCP server return MTU value
if [ -n "$new_interface_mtu" ]; then
# try to get MTU from config and replace original one
configured_mtu="$(get_mtu)"
if [[ -n $configured_mtu ]] ; then
logmsg info "Replacing MTU value for $interface with preconfigured one: $configured_mtu"
new_interface_mtu="$configured_mtu"
fi
fi
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