#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


set -e

# Including common functions
[ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh

# Setting static variables
DESCRIPTION="$(Echo 'installs loopback.cfg into binary')"
HELP=""
USAGE="${PROGRAM} [--force]"

Arguments "${@}"

# Reading configuration files
Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
Set_defaults

# We avoid checking if we need to be running this bootloader
# on purpose. The reason: You will always want to have
# a loopback.cfg file
# TODO: Add an option to be able to disable this file creation
Echo_message "Begin installing loopback.cfg..."

# Requiring stage file
Require_stagefile .build/config .build/bootstrap

# Checking stage file
Check_stagefile .build/binary_loopback_cfg

# Checking lock file
Check_lockfile .lock

# Creating lock file
Create_lockfile .lock

# Check architecture
Check_architectures amd64 i386
Check_crossarchitectures

# Local functions
Grub_live_entry_commands ()
{
	local KERNEL="${1}"
	local INITRD="${2}"
	local APPEND="${3}"

	LINUX_LIVE="${LINUX_LIVE}\nlinux\t\t/${KERNEL} ${INITFS:+boot=${INITFS} }config LB_BOOTAPPEND_LIVE ${APPEND}"
	LINUX_LIVE="${LINUX_LIVE}\ninitrd\t\t/${INITRD}"
}

Grub_live_entry ()
{
	local LABEL="${1}"
	local KERNEL="${2}"
	local INITRD="${3}"
	local APPEND="${4}"

	LINUX_LIVE="${LINUX_LIVE}\nmenuentry \"Debian GNU/Linux - ${LABEL}\" {"
	Grub_live_entry_commands "${KERNEL}" "${INITRD}" "${APPEND} findiso=\${iso_path}"
	LINUX_LIVE="${LINUX_LIVE}\n}"
}

Grub_live_autodetect_entry ()
{
	local LABEL="${1}"
	local AMD64_KERNEL="${2}"
	local AMD64_INITRD="${3}"
	local _486_KERNEL="${4}"
	local _486_INITRD="${5}"
	local APPEND="${6}"

	LINUX_LIVE="${LINUX_LIVE}\nmenuentry \"Debian GNU/Linux - ${LABEL}\" {"
	LINUX_LIVE="${LINUX_LIVE}\nif cpuid -l ; then"
	Grub_live_entry_commands "${AMD64_KERNEL}" "${AMD64_INITRD}" "${APPEND} findiso=\${iso_path}"
	LINUX_LIVE="${LINUX_LIVE}\nelse"
	Grub_live_entry_commands "${_486_KERNEL}" "${_486_INITRD}" "${APPEND} findiso=\${iso_path}"
	LINUX_LIVE="${LINUX_LIVE}\nfi"
	LINUX_LIVE="${LINUX_LIVE}\n}"
}

if [ -e "config/bootloaders/grub-pc" ]
then
	# Internal local copy
	_SOURCE="config/bootloaders/grub-pc"
else
	# Internal system copy
	if [ -n "${LIVE_BUILD}" ]
	then
		_SOURCE="${LIVE_BUILD}/share/bootloaders/grub-pc"
	else
		_SOURCE="/usr/share/live/build/bootloaders/grub-pc"
	fi
fi

case "${LB_INITRAMFS}" in
	live-boot)
		INITFS="live"
		;;

	*)
		INITFS=""
		;;
esac

# Assembling image specifics
case "${LIVE_IMAGE_TYPE}" in
	iso*)
		_BOOTLOADER="isolinux"

		case "${LB_MODE}" in
			progress-linux)
				_TARGET="binary/boot"
				;;

			*)
				_TARGET="binary/isolinux"
				;;
		esac
		;;

	netboot)
		_BOOTLOADER="pxelinux"
		_TARGET="tftpboot"
		;;

	hdd*|*)
		case ${LB_BINARY_FILESYSTEM} in
			fat*|ntfs)
				_BOOTLOADER=syslinux

				case "${LB_MODE}" in
					progress-linux)
						_TARGET="binary/boot"
						;;

					*)
						_TARGET="binary/syslinux"
						;;
				esac
				;;

			ext[234]|btrfs)
				_BOOTLOADER=extlinux
				_TARGET="binary/boot/extlinux"
				;;
			*)
				Echo_error "syslinux/extlinux doesn't support ${LB_BINARY_FILESYSTEM}"
				exit 1
				;;
		esac
		;;
esac

DESTDIR_LIVE="${_TARGET}"

Check_multiarchitectures

# Creating directory
mkdir -p "${DESTDIR_LIVE}"

# Setting boot parameters
if [ "${LB_UNION_FILESYSTEM}" != "aufs" ]
then
	LB_BOOTAPPEND_LIVE="${LB_BOOTAPPEND_LIVE} union=${LB_UNION_FILESYSTEM}"
fi

if [ -n "${LB_NET_COW_PATH}" ]
then
	Echo_error "Net cow not yet supported on grub"
	exit 1
fi

LB_BOOTAPPEND_LIVE="$(echo ${LB_BOOTAPPEND_LIVE} | sed -e 's|  ||')"

# Assembling kernel configuration
# If Bootloader is not syslinux that means
# binary_syslinux it's not going to rename kernel filenames in a later stage.
# We will use binary_grub2 algorithm which does not rename kernel filenames.

FOUND_SYSLINUX=""
OLDIFS="$IFS"
IFS=","
for BOOTLOADER in ${LB_BOOTLOADERS}
do

       case ${BOOTLOADER} in
               "syslinux" )
                       FOUND_SYSLINUX="True"
                       break ;;
       esac

done
IFS="$OLDIFS"

if [ -z ${FOUND_SYSLINUX} ]
then

	_AMD64_486_NUMBER="0"

	for _FLAVOUR in ${LB_LINUX_FLAVOURS}
	do
		if [ "${_FLAVOUR}" = "amd64" -o "${_FLAVOUR}" = "486" ] ; then
			_AMD64_486_NUMBER="$((${_AMD64_486_NUMBER} + 1))"
		fi
	done

	if [ "${_AMD64_486_NUMBER}" -ge 2 ] ; then
		# Default entries
		AMD64_KERNEL="$(basename chroot/boot/vmlinuz-*amd64)"
		AMD64_INITRD="initrd.img-$(echo ${AMD64_KERNEL} | sed -e 's|vmlinuz-||')"
		_486_KERNEL="$(basename chroot/boot/vmlinuz-*486)"
		_486_INITRD="initrd.img-$(echo ${_486_KERNEL} | sed -e 's|vmlinuz-||')"

		Grub_live_autodetect_entry "live (autodetect)" \
			"${INITFS}/${AMD64_KERNEL}" \
			"${INITFS}/${AMD64_INITRD}" \
			"${INITFS}/${_486_KERNEL}" \
			"${INITFS}/${_486_INITRD}"
	fi

	# Default entries
	DEFAULT_FLAVOUR="$(echo ${LB_LINUX_FLAVOURS} | awk '{ print $1 }')"
	DEFAULT_KERNEL="$(basename chroot/boot/vmlinuz-*${DEFAULT_FLAVOUR})"
	DEFAULT_INITRD="initrd.img-$(echo ${DEFAULT_KERNEL} | sed -e 's|vmlinuz-||')"

	Grub_live_entry "live" "${INITFS}/${DEFAULT_KERNEL}" "${INITFS}/${DEFAULT_INITRD}"

	if [ "${LB_BOOTAPPEND_FAILSAFE}" != "none" ]
	then
		Grub_live_entry "live (fail-safe mode)" "${INITFS}/${DEFAULT_KERNEL}" "${INITFS}/${DEFAULT_INITRD}" "${LB_BOOTAPPEND_FAILSAFE}"
	fi

	for KERNEL in chroot/boot/vmlinuz-*
	do
		VERSION="$(basename ${KERNEL} | sed -e 's|vmlinuz-||')"

		Grub_live_entry "live, kernel ${VERSION}" "${INITFS}/$(basename ${KERNEL})" "${INITFS}/initrd.img-${VERSION}"
		Grub_live_entry "live, kernel ${VERSION} (fail-safe mode)" "${INITFS}/$(basename ${KERNEL})" "${INITFS}/initrd.img-${VERSION}" "${LB_BOOTAPPEND_FAILSAFE}"
	done
else # LB_BOOTLOADERS does not contain syslinux
# If one of the bootloader is syslinux that means
# binary_syslinux it's going to rename kernel filenames.
# We will use binary_syslinux algorithm but without renaming kernel filenames.
# That will ensure binary_syslinux will find the original kernel filenames.
	#if [ -e "${_TARGET}/live.cfg.in" ]
	#then
		# This is all rather suboptimal.. needs prettifying at some point
		_FLAVOURS="$(echo ${LB_LINUX_FLAVOURS} | wc -w)"

		case "${_FLAVOURS}" in
			1)
				Grub_live_entry "live (${LB_LINUX_FLAVOURS})" "${INITFS}/vmlinuz" "${INITFS}/initrd.img" "${LB_BOOTAPPEND_LIVE}"
				Grub_live_entry "live (${LB_LINUX_FLAVOURS}) (failsafe mode)" "${INITFS}/vmlinuz" "${INITFS}/initrd.img" "${LB_BOOTAPPEND_LIVE_FAILSAFE}"
			;;

			*)
				_AMD64_486_NUMBER="0"

				for _FLAVOUR in ${LB_LINUX_FLAVOURS}
				do
					if [ "${_FLAVOUR}" = "amd64" -o "${_FLAVOUR}" = "486" ] ; then
						_AMD64_486_NUMBER="$((${_AMD64_486_NUMBER} + 1))"
					fi
				done

				_NUMBER="0"
				for _FLAVOUR in ${LB_LINUX_FLAVOURS}
				do
					_NUMBER="$((${_NUMBER} + 1))"
					if [ "${_FLAVOUR}" = "amd64" ] ; then
						AMD64_KERNEL="vmlinuz${_NUMBER}"
						AMD64_INITRD="initrd${_NUMBER}.img"
					fi

					if [ "${_FLAVOUR}" = "486" ] ; then
						_486_KERNEL="vmlinuz${_NUMBER}"
						_486_INITRD="initrd${_NUMBER}.img"
					fi
				done

				_NUMBER="0"

				for _FLAVOUR in ${LB_LINUX_FLAVOURS}
				do
					_NUMBER="$((${_NUMBER} + 1))"

					if [ "${_NUMBER}" -gt 1 ]
					then
						Grub_live_entry "live (${_FLAVOUR})" "${INITFS}/vmlinuz${_NUMBER}" "${INITFS}/initrd${_NUMBER}.img" "${LB_BOOTAPPEND_LIVE}"
						Grub_live_entry "live (${_FLAVOUR}) (failsafe mode)" "${INITFS}/vmlinuz${_NUMBER}" "${INITFS}/initrd${_NUMBER}.img" "${LB_BOOTAPPEND_LIVE_FAILSAFE}"

					else
						if [ "${_AMD64_486_NUMBER}" -ge 2 ] ; then

							Grub_live_autodetect_entry "live (autodetect)" \
								"${INITFS}/${AMD64_KERNEL}" \
								"${INITFS}/${AMD64_INITRD}" \
								"${INITFS}/${_486_KERNEL}" \
								"${INITFS}/${_486_INITRD}"
						fi

						Grub_live_entry "live (${_FLAVOUR})" "${INITFS}/vmlinuz${_NUMBER}" "${INITFS}/initrd${_NUMBER}.img" "${LB_BOOTAPPEND_LIVE}"
						Grub_live_entry "live (${_FLAVOUR}) (failsafe mode)" "${INITFS}/vmlinuz${_NUMBER}" "${INITFS}/initrd${_NUMBER}.img" "${LB_BOOTAPPEND_LIVE_FAILSAFE}"
					fi

				done

				;;
		esac
	#fi
fi
LINUX_LIVE="$(/bin/echo ${LINUX_LIVE} | sed -e 's|binary||g' -e 's|//|/|g')"

# Assembling memtest configuration
if [ -f "${DESTDIR_LIVE}"/memtest ]
then
	MEMTEST="#\t \"Other\"\n"
	MEMTEST="${MEMTEST}\nmenuentry\t\"${LB_MEMTEST}\" {\nlinux16\t${INITFS}/memtest\n}"
	MEMTEST="$(/bin/echo ${MEMTEST} | sed -e 's|//|/|g')"
fi

# Copying templates
mkdir -p binary/boot/grub
cp "${_SOURCE}"/grub.cfg binary/boot/grub/loopback.cfg

sed -i -e "s|LINUX_LIVE|${LINUX_LIVE}|" -e "s|LINUX_INSTALL||" -e "s|MEMTEST|${MEMTEST}|" binary/boot/grub/loopback.cfg
sed -i -e "s#LB_BOOTAPPEND_INSTALL##" -e "s#LB_BOOTAPPEND_LIVE#${LB_BOOTAPPEND_LIVE}#" binary/boot/grub/loopback.cfg

sed -i -e 's|\ $||g' binary/boot/grub/loopback.cfg

# Creating stage file
Create_stagefile .build/binary_loopback_cfg