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#!/bin/bash

set -e

DISTROLIST=()
ISOLIST=()
ROOTPATH=
DEVNAME=
KERNELDIR=
DATADIR=
INSTALL_GRUB=1
GRUBCFG_ONLY=0
DOWNLOAD_ONLY=0

. functions.sh

msg() {
	echo -e "$1" >&2
}

fatalerror() {
	msg "\x1b[1;31m$1\x1b[0m"
	exit 1
}

usage() {
	>&2 cat << EOF
$0 [--root=<rootpath>] [options] [distro 1] [distro 2] ...
use $0 -L to list available distros
options:
  --no-grub: do not install GRUB loader (still generate grub.cfg)
  --grubcfg: do not do real install, only generate grub.cfg file
  --downloadonly: only download the ISO files
  --dev=<diskdev>: write boot sector to <diskdev> (default <diskdev> is autodetected from <rootpath>)
EOF
}

while [[ -n "$1" ]]
do
	case "$1" in
		-L)
			exec ./listisos.sh
			;;
		--root=*)
			ROOTPATH=${1/--root=}
			UUID="$(findmnt -o UUID --raw --noheadings $ROOTPATH \
				|| fatalerror "UUID of $ROOTPATH not found, not a mountpoint?")"
			DEVNAME="/dev/$(getdiskbypart "/dev/disk/by-uuid/$UUID")"
			KERNELDIR="$ROOTPATH/liveusb-kernel"
			DATADIR="$ROOTPATH/liveusb-data"
			GRUBCFG="$ROOTPATH/grub/grub.cfg"
			install -d "$KERNELDIR" "$DATADIR"
			msg "Files will be copy to $ROOTPATH"
			;;
		--dev=*)
			DEVNAME=${1/--dev=}
			;;
		--no-grub)
			INSTALL_GRUB=0
			;;
		--grubcfg)
			GRUBCFG_ONLY=1
			;;
		--downloadonly)
			DOWNLOAD_ONLY=1
			;;
		*=*|-*)
			usage
			exit 1
			;;
		*)
			if [ -f "distro/$1/isoinfo" ]
			then
				DISTROLIST=(${DISTROLIST[@]} "$1")
			else
				fatalerror "directory distro/$1/isoinfo not found"
			fi
			;;
	esac
	shift
done

if [[ -z "$ROOTPATH" && "$DOWNLOAD_ONLY" == 0 ]]; then
	usage
	exit 1
fi

if [[ "${#DISTROLIST[@]}" == 0 ]]; then
	usage
	exit 1
fi

if [ ! -z "$DEVNAME" ]; then
	msg "Boot sector will be written to $DEVNAME"
fi

for i in ${DISTROLIST[@]}
do
	process_isoinfo "$i"
	ISOLIST=("${ISOLIST[@]}" "$ISOFILE")
	ISONAMELIST=("${ISONAMELIST[@]}" "$ISONAME")

	if [ -f "isofiles/$ISOFILE" ] && checksum_verify; then
		true
	else
		download_iso
	fi
done

if [[ "$DOWNLOAD_ONLY" == 1 ]]; then
	exit 0
fi

install -d "$ROOTPATH/grub"
echo '# The live USB grub.cfg file' > "$GRUBCFG"

if [ -z "$TXTMODE" ]; then
	cat >> "$GRUBCFG" << 'EOF'
insmod all_video
insmod font
if loadfont /grub/fonts/unicode.pf2
then
	insmod gfxterm
	set gfxmode=auto
	set gfxpayload=keep
	terminal_output gfxterm
fi

EOF
fi

for i in `seq 1 ${#DISTROLIST[@]}`
do
	ISOFILE="${ISOLIST[$i-1]}"
	ISONAME="${ISONAMELIST[$i-1]}"
	DISTRO="${DISTROLIST[$i-1]}"
	process_distro "$DISTRO"

	if [ "$GRUBCFG_ONLY" == 0 ]; then
		install_live
	fi
	gen_grubcfg "$DISTRO" >> "$GRUBCFG"
done

if [ "$GRUBCFG_ONLY" == 1 ]; then
	msg 'Only generate grub.cfg, will not install GRUB.'
elif [ "$INSTALL_GRUB" == 1 ]; then
	read -p 'Answer Y to install GRUB.[Y/n] '
	if [[ "$REPLY" =~ ^[Yy]|^$ ]]; then
		as-root grub-install --boot-directory="$ROOTPATH" --target=i386-pc "$DEVNAME"
		as-root grub-install --boot-directory="$ROOTPATH" --efi-directory="$ROOTPATH" --bootloader-id=grub --target=x86_64-efi --removable --no-nvram "$DEVNAME"
	fi
fi