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#!/usr/bin/env bash
set -e
# this should ensure that notify-send works when script is run by crond
export XDG_RUNTIME_DIR=/run/user/$(id -u)
FLAG_FILE="$HOME/local/duplicity-flag-file"
DUPLY_PROFILE="$(hostname -s)-$(whoami)-home"
# ensure only one copy of this script is ever running at once
[ "${FLOCKER}" != "$0" ] && exec env FLOCKER="$0" flock -en "$0" "$0" "$@" ||:
# ensure that the duply profile we want to use exists -- it's an error
# if it doesn't because this script shouldn't be in our crontab if it
# doesn't
if ! [ -e "$HOME/.duply/$DUPLY_PROFILE/conf" ]; then
echo >&2 "workstation-duplicity: duply configuration missing"
exit 1
fi
offline () {
test "$(wget -q -O- --tries=10 -T20 http://www.msftncsi.com/ncsi.txt)" \
!= "Microsoft NCSI"
}
# fewer checks if we're running at a terminal (this is a bashism)
if ! [ -t 1 ]; then
# check when we last ran; don't run if it was less than four hours ago
if [ -e "$FLAG_FILE" ] \
&& [ -n "$(find $FLAG_FILE -newermt '4 hours ago')" ]; then
echo "flag file too new; not backing up"
exit 0
fi
# don't bother if we're not online
if offline; then
echo "not online; not backing up"
exit 0
fi
# don't try to backup immediately; we might not be online for long
sleep 300
# confirm we're still online
if offline; then
echo "not online; not backing up"
exit 0
fi
fi
set +e
if [ -e "$FLAG_FILE" ]; then
# attempt an incremental backup -- always incremental since we
# might be running from a cronjob on weak coffee shop WiFi
duply $DUPLY_PROFILE incr --force
else
# interpret lack of flag file to mean this host's OS has been
# reinstalled. Do a full backup, as doing an incremental backup
# against the old host's filesystem is not useful. This full
# backup won't be purged immediately (MAX_FULL_BACKUPS is 2), in
# case files need to be restored
duply $DUPLY_PROFILE full
fi
exit=$?
set -e
if [ $exit = 0 ]; then
if [ -e "$FLAG_FILE" ]; then
type="incr"
else
type="full"
fi
notify-send --urgency=low --expire-time=10000 --icon=package_network \
"duplicity $type backup @ $(date '+%-l:%M%#p %Z')" ||:
# update flag file so cronjob doesn't do this again for four hours
touch $FLAG_FILE
else
if nc -w1 -q0 ch-s012.rsync.net 22 </dev/null; then
msg="Looks like SSH to backup host is possible."
else
msg="We're online, but couldn't SSH to the backup host."
fi
notify-send --urgency=critical --icon=dialog-warning \
"duplicity could not connect" "$msg" ||:
fi
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