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#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'
os_new="arch-rt"
os_old="ubuntu-studio"
os_current=""
os_set=""
syslinux_location_arch="/boot/syslinux/syslinux.cfg"
syslinux_location_ubuntu="/mnt/boot/syslinux/syslinux.cfg"
syslinux_location=""
reboot_cmd_arch="sudo systemctl reboot"
reboot_cmd_ubuntu="/usr/bin/sudo /sbin/reboot -q"
reboot_cmd=""
hostnames_arch=( "wfs-master" "wfs-node1" "wfs-node2" )
hostnames_ubuntu=( "wfs" "n101" "n102" )
host=$(hostname)
if [ $UID -ne 0 ]; then
echo "You need to be root or call this script with sudo to do this."
exit 1
fi
echo "Host: $host."
if [ -f /etc/arch-release ]; then
os_current=$os_new
syslinux_location=$syslinux_location_arch
reboot_cmd=$reboot_cmd_arch
else
os_current=$os_old
syslinux_location=$syslinux_location_ubuntu
reboot_cmd=$reboot_cmd_ubuntu
fi
echo "Currently running: $os_current"
if [ -f "${syslinux_location}" ]; then
os_set=$(sed -ne '/^DEFAULT/p' $syslinux_location| cut -d' ' -f2)
echo "Currently set up for next boot: $os_set"
else
echo "Error: Syslinux configuration does not exist ($syslinux_location)"
exit 1
fi
if [ "$os_set" == "${os_new}" ] && [ "$os_current" == "${os_new}" ]; then
if [[ " ${hostnames_arch[@]} " =~ " $host " ]]; then
echo "Switching to: $os_old"
sed -i 's/^DEFAULT .*/DEFAULT '${os_old}'/' $syslinux_location
if [[ "${hostnames_arch[0]}" == "$host" ]]; then
echo "Calling script on nodes:"
set +e
ssh wfs@${hostnames_arch[1]} "/usr/bin/sudo bin/$(basename $0)"
ssh wfs@${hostnames_arch[2]} "/usr/bin/sudo bin/$(basename $0)"
set -e
fi
else
echo "Error: Script is not supposed to be running on this host!"
echo "$(hostname) is not one of the following: ${hostnames_arch[@]}"
echo "Exiting."
exit 1
fi
elif [ "$os_set" == "${os_old}" ] && [ "$os_current" == "${os_old}" ]; then
if [[ " ${hostnames_ubuntu[@]} " =~ " $host " ]]; then
echo "Switching to: $os_new"
sed -i 's/^DEFAULT .*/DEFAULT '${os_new}'/' $syslinux_location
if [[ "${hostnames_ubuntu[0]}" == "$host" ]]; then
echo "Calling script on nodes:"
ssh wfs@${hostnames_ubuntu[1]} "/usr/bin/sudo bin/$(basename $0)"
ssh wfs@${hostnames_ubuntu[2]} "/usr/bin/sudo bin/$(basename $0)"
fi
else
echo "Error: Script is not supposed to be running on this host!"
echo "$host is not one of the following: ${hostnames_ubuntu[@]}"
echo "Exiting."
exit 1
fi
else
echo "Error: Current OS ($os_current) and OS to be booted ($os_set) are not the same."
echo "Fix this manually in $syslinux_location or just reboot (into the other OS)."
echo "Exiting."
exit 1
fi
echo "Rebooting."
eval $reboot_cmd
exit 0
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