#!/bin/sh

# do_flush() flushes every active network interface. It is intended to
# run before NetworkManager starts, so that when it does it will be able
# to set up the network using the regular host configuration.
do_flush() {
  for f in /sys/class/net/*; do
    iface="${f##*/}"
    [ "${iface}" = "lo" ] && continue
    echo "Preparing to flush interface ${iface}" >&2
    ip -statistics address flush dev "${iface}"
    rm -f /run/NetworkManager/system-connections/default_connection.nmconnection >&2
  done
}

# reset_autoconn_prio() will reset the autoconnect priority
# of the existing NM connections to zero.
reset_autoconn_prio() {
  nmcli -t -f NAME connection show 2>/dev/null | while read -r _c; do
    if ! _prio="$(nmcli -t connection show "${_c}" \
           | grep connection.autoconnect-priority: \
           | cut -d: -f2)" || [ -z "${_prio}" ]; then
      continue
    fi
    [ "${_prio}" -ge 0 ] && continue
    echo "Setting autoconnect-priority of connection ${_c} to zero" >&2
    nmcli connection modify "${_c}" connection.autoconnect-priority 0
  done
}

case "${1}" in
reset-autoconn-prio)
  reset_autoconn_prio;;
flush)
  do_flush;;
esac

# vim:set ts=2 sw=2 et: