#!/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

# Variable used to embed newlines
NL="
"

# Local functions
Grub_menu_entry() {
	local LABEL="$1"
	local KERNEL="$2"
	local INITRD="$3"
	local APPEND="$4"

	cat <<END
menuentry "$LABEL" {
	linux	$KERNEL $APPEND
	initrd	$INITRD
}
END
}

Grub_live_entry ()
{
	LINUX_LIVE="${LINUX_LIVE}$(Grub_menu_entry "$@")$NL"
}

Grub_install_entry ()
{
	LABEL="${1}"
	TYPE="${2}"
	KERNEL="${3}"
	INITRD="${4}"
	APPEND="${5}"

	# Drop "quiet" kernel parameter for rescue entries
	case $TYPE in
		rescue|rescuegui)
			APPEND=$(echo "$APPEND" | sed -e 's/ quiet//')
			;;
	esac

	if [ -z "$LINUX_INSTALL" ]; then
		# First entry recorded in LINUX_INSTALL
		LINUX_INSTALL="$(Grub_menu_entry "$LABEL" "$KERNEL" "$INITRD" "$APPEND")$NL"
	else
		# Remaining entries recorded in LINUX_ADVANCED_INSTALL
		LINUX_ADVANCED_INSTALL="$LINUX_ADVANCED_INSTALL$(Grub_menu_entry "$LABEL" "$KERNEL" "$INITRD" "$APPEND")$NL"
	fi
}

Grub_live_autodetect_menu_entry ()
{
	local LABEL="${1}"
	local AMD64_KERNEL="${2}"
	local AMD64_INITRD="${3}"
	local _686_KERNEL="${4}"
	local _686_INITRD="${5}"
	local APPEND="${6}"
	cat <<END
# Autodetect if amd64 is supported
menuentry "$LABEL" {
	if cpuid -l; then
		linux ${AMD64_KERNEL} ${APPEND}
		initrd ${AMD64_INITRD}
	else
		linux ${_686_KERNEL} ${APPEND}
		initrd ${_686_INITRD}
	fi
}
END
}

Grub_live_autodetect_entry ()
{
	LINUX_LIVE="${LINUX_LIVE}$(Grub_live_autodetect_menu_entry "$@")$NL"
}

Grub_memtest_menu_entry ()
{
	cat <<END
menuentry "$LB_MEMTEST" {
	linux16 /${INITFS}/memtest
}
END
}

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="boot"
		;;
esac

Check_multiarchitectures

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

# 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-||')"

KERNEL_LIVE="/${INITFS}/${DEFAULT_KERNEL}"
INITRD_LIVE="/${INITFS}/${DEFAULT_INITRD}"
APPEND_LIVE="${LB_BOOTAPPEND_LIVE} findiso=\${iso_path}"

# Assembling kernel configuration
_AMD64_686_NUMBER="0"

for _FLAVOUR in ${LB_LINUX_FLAVOURS}
do
	if [ "${_FLAVOUR}" = "amd64" -o "${_FLAVOUR}" = "686" ] ; then
		_AMD64_686_NUMBER="$((${_AMD64_686_NUMBER} + 1))"
	fi
done

if [ "${_AMD64_686_NUMBER}" -ge 2 ] ; then
	# Default entries
	AMD64_KERNEL="$(basename chroot/boot/vmlinuz-*amd64)"
	AMD64_INITRD="initrd.img-$(echo ${AMD64_KERNEL} | sed -e 's|vmlinuz-||')"
	_686_KERNEL="$(basename chroot/boot/vmlinuz-*686)"
	_686_INITRD="initrd.img-$(echo ${_686_KERNEL} | sed -e 's|vmlinuz-||')"

	Grub_live_autodetect_entry "Live system (autodetect)" \
		"/${INITFS}/${AMD64_KERNEL}" \
		"/${INITFS}/${AMD64_INITRD}" \
		"/${INITFS}/${_686_KERNEL}" \
		"/${INITFS}/${_686_INITRD}" \
		"${APPEND_LIVE}"

	if [ "${LB_BOOTAPPEND_LIVE_FAILSAFE}" != "none" ]
	then
		Grub_live_autodetect_entry "Live system (autodetect) (fail-safe mode)" \
			"/${INITFS}/${AMD64_KERNEL}" \
			"/${INITFS}/${AMD64_INITRD}" \
			"/${INITFS}/${_686_KERNEL}" \
			"/${INITFS}/${_686_INITRD}" \
			"${LB_BOOTAPPEND_LIVE_FAILSAFE}"
	fi
else
	Grub_live_entry "Live system" "/${INITFS}/${DEFAULT_KERNEL}" "/${INITFS}/${DEFAULT_INITRD}" "${APPEND_LIVE}"
	if [ "${LB_BOOTAPPEND_LIVE_FAILSAFE}" != "none" ]
	then
		Grub_live_entry "Live system (fail-safe mode)" "/${INITFS}/${DEFAULT_KERNEL}" "/${INITFS}/${DEFAULT_INITRD}" "${LB_BOOTAPPEND_LIVE_FAILSAFE}"
	fi
fi

_COUNT=0
for KERNEL in chroot/boot/vmlinuz-*; do
	_COUNT=$(( $_COUNT + 1 ))
done

if [ $_COUNT -gt 1 ]; then
	for KERNEL in chroot/boot/vmlinuz-*
	do
		VERSION="$(basename ${KERNEL} | sed -e 's|vmlinuz-||')"

		Grub_live_entry "Live system, kernel ${VERSION}" "/${INITFS}/$(basename ${KERNEL})" "/${INITFS}/initrd.img-${VERSION}" "${APPEND_LIVE}"

		if [ "${LB_BOOTAPPEND_LIVE_FAILSAFE}" != "none" ]; then
			Grub_live_entry "Live system, kernel ${VERSION} (fail-safe mode)" "/${INITFS}/$(basename ${KERNEL})" "/${INITFS}/initrd.img-${VERSION}" "${LB_BOOTAPPEND_LIVE_FAILSAFE}"
		fi
	done
fi

# Assembling debian-installer configuration
if [ "${LB_DEBIAN_INSTALLER}" != "false" ]
then
	KERNEL_DI="/install/vmlinuz"
	INITRD_DI="/install/initrd.gz"
	APPEND_DI="vga=normal quiet ${LB_BOOTAPPEND_INSTALL}"

	KERNEL_GI="/install/gtk/vmlinuz"
	INITRD_GI="/install/gtk/initrd.gz"
	APPEND_GI="video=vesa:ywrap,mtrr vga=788 quiet ${LB_BOOTAPPEND_INSTALL}"

	Grub_install_entry "Start installer" "installgui" "${KERNEL_GI}" "${INITRD_GI}" "${APPEND_GI}"

	Grub_install_entry "Install in graphical mode" "installgui" "${KERNEL_GI}" "${INITRD_GI}" "${APPEND_GI}"
	Grub_install_entry "Install in text mode" "install" "${KERNEL_DI}" "${INITRD_DI}" "${APPEND_DI}"
	Grub_install_entry "Expert install in graphical mode" "expertgui" "${KERNEL_GI}" "${INITRD_GI}" "priority=low ${APPEND_GI}"
	Grub_install_entry "Expert install in text mode" "expert" "${KERNEL_DI}" "${INITRD_DI}" "priority=low ${APPEND_DI}"
	Grub_install_entry "Automatic install in graphical mode" "autogui" "${KERNEL_GI}" "${INITRD_GI}" "auto=true priority=critical ${APPEND_GI}"
	Grub_install_entry "Automatic install in text mode" "auto" "${KERNEL_DI}" "${INITRD_DI}" "auto=true priority=critical ${APPEND_DI}"
	Grub_install_entry "Rescue system in graphical mode" "rescuegui" "${KERNEL_GI}" "${INITRD_GI}" "rescue/enable=true ${APPEND_GI}"
	Grub_install_entry "Rescue system in text mode" "rescue" "${KERNEL_DI}" "${INITRD_DI}" "rescue/enable=true ${APPEND_DI}"
fi

# Assembling memtest configuration
if [ -f "binary/${INITFS}/memtest" ]
then
	MEMTEST="$(Grub_memtest_menu_entry)$NL"
fi

# Copying templates
mkdir -p binary/boot/grub
cp -a "${_SOURCE}"/* binary/boot/grub/

escape_for_sed() {
	echo -n "$1" | perl -npe 's/\n/\\n/gm'
}

sed -i \
    -e "s|LINUX_LIVE|$(escape_for_sed "${LINUX_LIVE}")|" \
    -e "s|LINUX_ADVANCED_INSTALL|$(escape_for_sed "${LINUX_ADVANCED_INSTALL}")|" \
    -e "s|LINUX_INSTALL|$(escape_for_sed "${LINUX_INSTALL}")|" \
    -e "s|MEMTEST|$(escape_for_sed "${MEMTEST}")|" \
    -e "s|KERNEL_GI|$(escape_for_sed "${KERNEL_GI}")|" \
    -e "s|INITRD_GI|$(escape_for_sed "${INITRD_GI}")|" \
    -e "s|APPEND_GI|$(escape_for_sed "${APPEND_GI}")|" \
    -e "s|KERNEL_DI|$(escape_for_sed "${KERNEL_DI}")|" \
    -e "s|INITRD_DI|$(escape_for_sed "${INITRD_DI}")|" \
    -e "s|APPEND_DI|$(escape_for_sed "${APPEND_DI}")|" \
    -e "s|KERNEL_LIVE|$(escape_for_sed "${KERNEL_LIVE}")|" \
    -e "s|INITRD_LIVE|$(escape_for_sed "${INITRD_LIVE}")|" \
    -e "s|APPEND_LIVE|$(escape_for_sed "${APPEND_LIVE}")|" \
    -e "s|LB_BOOTAPPEND_INSTALL|$(escape_for_sed "${LB_BOOTAPPEND_INSTALL}")|" \
    -e "s|LB_BOOTAPPEND_LIVE_FAILSAFE|$(escape_for_sed "${LB_BOOTAPPEND_LIVE_FAILSAFE}")|" \
    -e "s|LB_BOOTAPPEND_LIVE|$(escape_for_sed "${LB_BOOTAPPEND_LIVE}")|" \
    binary/boot/grub/*.cfg

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

echo "source /boot/grub/grub.cfg" > binary/boot/grub/loopback.cfg

# Creating stage file
Create_stagefile .build/binary_loopback_cfg