/etc/network/if-up.d/ltsp-keys is in ltsp-server 5.3.7-0ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | #!/bin/sh
#
# Copyright (c) 2006 Canonical LTD
#
# Author: Oliver Grawert <ogra@canonical.com>
#
# 2007, Scott Balneaves <sbalneav@ltsp.org>
#
# This program 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 2 of the
# License, or (at your option) any later version.
#
# This program 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 this program. If not, you can find it on the World Wide
# Web at http://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# make sure the ssh keys for ldm are freshly copied to the
# ltsp client chroot so we avoid breakage if the IP changed
[ "$IFACE" != "lo" ] || exit 0
test -f /usr/sbin/ltsp-update-sshkeys || exit 0
/usr/sbin/ltsp-update-sshkeys >/dev/null 2>&1 || true
|