#!/bin/sh -e
#
# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
# Check whether a configuration for the interface already exists with the same
# name already exists.
# The output will be "exists" followed by the config file path on the next line,
# or "absent"
# In case networkctl cannot be found, the output will be "error".
#

networkctl_bin=$("${__type_explorer:?}/networkctl_bin")

test -x "${networkctl_bin}" || { echo error; exit 0; }

if test -f "${__object:?}/parameter/name"
then
	name=$(cat "${__object:?}/parameter/name")
else
	name=${__object_id:?}
fi

if "${networkctl_bin}" --no-pager --no-legend list "${name}" >/dev/null 2>&1
then
	echo exists

	"${networkctl_bin}" --no-pager --no-legend status "${name}" \
	| awk -F ': ' -v ifname="${name}" '
	  BEGIN {
		  # header line
		  getline
		  # · N: en...
		  if (index($2, ifname) != 1 || substr($2, length(ifname) + 1) !~ /^[[:blank:]]*$/)
			  exit
	  }
	  !$0 { exit }  # skip journal lines
	  /^[[:blank:]]*Network File:/ {
		  sub(/[[:blank:]]*$/, "", $2)
		  print $2
	  }' \
	| grep -ixvF 'n/a' || true  # networkctl prints "n/a" if iface is unmanaged
else
	echo absent
fi