#!/bin/sh
# Generate a TPM key used to unlock LUKS disks
set -e -o pipefail
. /etc/functions

lvm_volume_group=""
while getopts "p:d:l:" arg; do
	case $arg in
		p) paramsdir="$OPTARG" ;;
		d) paramsdev="$OPTARG" ;;
		l) lvm_volume_group="$OPTARG" ;;
	esac
done
shift `expr $OPTIND - 1`
key_devices="$@"

if [ -z "$paramsdir" ]; then
	die "Usage: $0 -p /boot [-l qubes_dom0] [/dev/sda2 /dev/sda5 ...] "
fi

if [ -z "$paramsdev" ]; then
	paramsdev="$paramsdir"
fi

if [ -n "$lvm_volume_group" ]; then
	lvm vgchange -a y $lvm_volume_group \
	|| die "Failed to activate the LVM group"

	for dev in /dev/$lvm_volume_group/*; do
		key_devices="$key_devices $dev"
	done
fi

if [ -z "$key_devices" ]; then
	die "No devices specified for TPM key insertion"
fi

# try to switch to rw mode
mount -o rw,remount $paramsdev

rm -f $paramsdir/kexec_key_lvm.txt || true
if [ -n "$lvm_volume_group" ]; then
	echo "$lvm_volume_group" > $paramsdir/kexec_key_lvm.txt \
	|| die "Failed to write lvm group to key config "
fi

rm -f $paramsdir/kexec_key_devices.txt || true
for dev in $key_devices; do
	uuid=`cryptsetup luksUUID "$dev" 2>/dev/null` \
	|| die "Failed to get UUID for device $dev"
	echo "$dev $uuid" >> $paramsdir/kexec_key_devices.txt \
	|| die "Failed to add $dev:$uuid to key devices config"
done

kexec-seal-key $paramsdir \
|| die "Failed to save and generate key in TPM"

# sign and auto-roll config counter
kexec-sign-config -p $paramsdir -u \
|| die "Failed to sign updated config"

# switch back to ro mode
mount -o ro,remount $paramsdev