commit a638ff8392a1cab3d0030e2473cbd803a871341e
Author: Christian Ulrich <christian@ulrich.earth>
Date:   Sat Mar 9 16:46:25 2019 +0100

    initial commit

diff --git a/backup/backup.sh b/backup/backup.sh
new file mode 100644
index 0000000..0cdaf2d
--- /dev/null
+++ b/backup/backup.sh
@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+
+# backup.sh
+#
+# Copyright (C) 2019  Christian Ulrich
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+SERVER_MAC_ADDRESS=40:61:86:32:f8:c3
+SERVER_STAGE1_IP=10.0.0.19
+SERVER_STAGE1_PORT=2222
+SERVER_STAGE1_USERNAME=root
+SERVER_IP="$SERVER_STAGE1_IP"
+SERVER_PORT=22
+SERVER_USERNAME=luno
+SSH_IDENTITY_FILE=~/.ssh/id_rsa
+DIRECTORIES=("/data" "/etc/nixos" "/var/lib/matrix-synapse" "/var/lib/postgresql" "/var/lib/prosody")
+
+function cleanup {
+  ssh-add -d $SSH_IDENTITY_FILE
+  kill $SSH_AGENT_PID
+}
+
+function wakeup_server {
+  wakelan $SERVER_MAC_ADDRESS
+}
+
+function wait_for_server {
+  local ip="$1"
+  local port="$2"
+
+  echo "Waiting for $1:$2 ..."
+  while true; do
+    nc -z $ip $port 2>/dev/null && break
+  done
+}
+
+function init_server {
+  eval $(ssh-agent) 1>/dev/null
+  ssh-add $SSH_IDENTITY_FILE
+  wait_for_server $SERVER_STAGE1_IP $SERVER_STAGE1_PORT || return 1
+  ssh -l $SERVER_STAGE1_USERNAME -p $SERVER_STAGE1_PORT $SERVER_STAGE1_IP -t 'cryptsetup-askpass'
+  wait_for_server $SERVER_IP $SERVER_PORT || return 2
+}
+
+function shutdown_server {
+  echo "Trying to shutdown server."
+  ssh -l $SERVER_USERNAME -p $SERVER_PORT $SERVER_IP 'sudo shutdown -h now'
+}
+
+function do_backup {
+  echo "Starting backup..."
+  rsync -avR --no-inc-recursive --info=progress2 --delete -e "ssh -p $SERVER_PORT" "${DIRECTORIES[@]}" $SERVER_USERNAME@$SERVER_IP:
+  if [ $? -eq 0 ]; then
+    echo "Backup successful!"
+  fi
+}
+
+function main {
+  wakeup_server
+  init_server
+  if [ $? -eq 0 ]; then
+    do_backup
+  fi
+  shutdown_server
+  cleanup
+}
+
+main