add reboot after firstboot example nmcclain#12

examples/reboot/firstboot.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+LOGFILE="/boot/firstboot.log"
+
+# Log everything: https://serverfault.com/a/103569/662521
+exec 3>&1 4>&2
+trap 'exec 2>&4 1>&3' 0 1 2 3
+exec 1>${LOGFILE} 2>&1
+
+# update APT packages
+export DEBIAN_FRONTEND=noninteractive
+apt-get update -o Acquire::Check-Valid-Until=false -o Acquire::Check-Date=false
+apt-get install -y upgrade
+
+# set timezone and update time
+timedatectl set-timezone UTC
+ntpdate ntp.ubuntu.com
+
+# Reboot delayed, so that we can exit with success to complete firstboot.service
+systemd-run --no-block sh -c "sleep 3 && touch /boot/reboot && reboot"
+
+echo "Done firstboot, exit, but reboot in 3 seconds"
+exit 0
+
+# check /boot/reboot and /boot/firstboot.log