#! /bin/sh
# Install iSCSI packages in the target if necessary. iSCSI volumes
# containing the root filesystem also need some special settings for
# robustness.

. /lib/partman/lib/base.sh

get_default_interface () {
	db_get netcfg/choose_interface || return 1
	default_interface="${RET%%:*}"
	# Work around netcfg/choose_interface not always being set:
	#   https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/430820
	if [ -z "$default_interface" ]; then
		default_interface=eth0
	fi
}

have_iscsi=
portal=
target=
username=
password=
username_in=
password_in=
for dev in $DEVICES/*; do
	[ -d "$dev" ] || continue
	[ -e "$dev/iscsi_portal" ] || continue
	have_iscsi=1
	cd "$dev"
	portal="$(cat "$dev/iscsi_portal")"
	target="$(cat "$dev/iscsi_target")"

	contains_root=
	open_dialog PARTITIONS
	while { read_line num id size type fs path name; [ "$id" ]; }; do
		[ "$fs" != free ] || continue
		[ -f "$id/method" ] || continue
		[ -f "$id/acting_filesystem" ] || continue
		[ -f "$id/mountpoint" ] || continue
		mountpoint="$(cat "$id/mountpoint")"
		[ "$mountpoint" = / ] || continue
		contains_root=1
	done
	close_dialog

	[ "$contains_root" ] || continue
	iscsiadm -m node --portal "${portal%,*}" --targetname "$target" -o update -n 'node.conn[0].timeo.noop_out_interval' -v 0
	iscsiadm -m node --portal "${portal%,*}" --targetname "$target" -o update -n 'node.conn[0].timeo.noop_out_timeout' -v 0
	iscsiadm -m node --portal "${portal%,*}" --targetname "$target" -o update -n 'node.session.timeo.replacement_timeout' -v 86400
	username="$(cat "$dev/iscsi_username")"
	password="$(cat "$dev/iscsi_password")"
	username_in="$(cat "$dev/iscsi_username_in")"
	password_in="$(cat "$dev/iscsi_password_in")"
	break
done

if [ "$have_iscsi" ]; then
	apt-install open-iscsi || true
fi

if [ "$portal" ]; then
	group="${portal##*,}"
	portal="${portal%,*}"
	ip="${portal%%:*}"
	port="${portal#*:}"
	mkdir -p /target/etc/iscsi
	get_default_interface
	if [ -f "/sys/class/net/$default_interface/address" ]; then
		cat >>/target/etc/iscsi/iscsi.initramfs <<EOF
HWADDR="$(cat "/sys/class/net/$default_interface/address")"
EOF
	fi
	cat >>/target/etc/iscsi/iscsi.initramfs <<EOF
ISCSI_TARGET_NAME="$target"
ISCSI_TARGET_IP="$ip"
ISCSI_TARGET_PORT="$port"
ISCSI_TARGET_GROUP="$group"
EOF
	if [ "$username" ] && [ "$username" != "(null)" ]; then
		cat >>/target/etc/iscsi/iscsi.initramfs <<EOF
ISCSI_USERNAME="$username"
ISCSI_PASSWORD="$password"
EOF
		if [ "$username_in" ] && [ "$username_in" != "(null)" ]; then
			cat >>/target/etc/iscsi/iscsi.initramfs <<EOF
ISCSI_IN_USERNAME="$username_in"
ISCSI_IN_PASSWORD="$password_in"
EOF
		fi
	fi
	chmod 600 /target/etc/iscsi/iscsi.initramfs

	# This isn't ideal, but ifupdown doesn't expose any interface that
	# might allow the initramfs to dynamically tell it to avoid a
	# particular interface on this boot.
	if db_get netcfg/choose_interface; then
		# Work around netcfg/choose_interface not always being set:
		#   https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/430820
		[ "$RET" ] || RET=eth0
		sed -i "s/\(iface ${RET%%:*} inet\) dhcp/\1 manual/" \
			/etc/network/interfaces || true
	fi
else
	rm -f /target/etc/iscsi/iscsi.initramfs
fi

exit 0