/usr/bin/backup-takedown is in chiark-backup 4.4.2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# takedown
# Entry point for cron to take the system down for backups
#
# This file is part of chiark backup, a system for backing up GNU/Linux and
# other UN*X-compatible machines, as used on chiark.greenend.org.uk.
#
# chiark backup is:
# Copyright (C) 1997-1998,2000-2001,2007
# Ian Jackson <ian@chiark.greenend.org.uk>
# Copyright (C) 1999 Peter Maydell <pmaydell@chiark.greenend.org.uk>
#
# This 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, or (at your option) any later version.
#
# This 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, consult the Free Software Foundation's
# website at www.fsf.org, or the GNU Project website at www.gnu.org.
# Expects a single (possibly empty) argument X which is used to select
# a file /etc/chiark-backup/warnings.X. This file will contain lines like:
# T 300 "in 10 minutes"
# T 240 "in 5 minutes"
# T 45 "in 1 minute"
# T 15 "in 15 seconds"
# configuring the frequency of warning messages. If you call the
# files 'warnings.soon', 'warnings.now' and 'warnings.' then
# you can invoke this as:
# takedown lots of warnings
# takedown soon not so many warnings
# takedown now no warning at all
set -e
cd /etc/chiark-backup
host="`hostname`" || true
T () {
(
exec wall <<END &
*** WARNING - SYSTEM GOING DOWN FOR BACKUPS ***
$host will shut down automatically $2.
END
) &
sleep $1
}
. "warnings.$1"
(
exec wall <<END &
*** WARNING - SYSTEM GOING DOWN FOR BACKUPS ***
$host is shutting down IMMEDIATELY.
END
) &
sleep 1
# We assume that runlevel 5 is set up suitably for doing backups
# (ie non-essential services turned off in an effort to get the
# tape to stream.)
telinit 5
|