reexec: support systemd-boot hierarchy

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

# Easy kexec

# kexec for dummies

(( UID > 0 )) && { echo "You must be root" >&2; exit 1; }

whence -p kexec >/dev/null || { echo "kexec is not in PATH" >&2; exit 1; }

[[ -r /boot ]] || { echo "Unable to read /boot" >&2; exit 1; }

select kernel in /boot/vmlinuz-*(om); do

	if [[ -e /boot/initramfs-${kernel##*vmlinuz-}.img ]]; then

		initrd="--initrd=/boot/initramfs-${kernel##*vmlinuz-}.img"

read machineid < /etc/machine-id

kernels=( /boot/vmlinuz-*(Nom) /boot/"$machineid"/*/linux(Nom) )

(( ${#kernels[@]} > 0 )) || { echo "No kernel found." >&2; exit 2; }

select kernel in "${kernels[@]}"; do

	if [[ -e /boot/initramfs-${kernel#*-}.img ]]; then

		initrd="--initrd=/boot/initramfs-${kernel#*-}.img"

	fi

	kexec -l --reuse-cmdline "$initrd" "$kernel"

	systemctl kexec