create grub1 empty image

create_eimg_grub1.sh

#!/bin/bash

tarball=$1
output_img=$2
size=$3

check_tarball() {
	if [[ ! -s $tarball ]]; then
		echo "tarball: $tarball not found" >&2
	fi
}

create_partition() {
	local output_img=$1; shift
	local loop_dev=$(losetup --show --find $output_img)

	# 创建Label
	echo Yes | parted -- $loop_dev mklabel msdos

	# 获取分区大小
	local rc="$(parted -- $loop_dev unit B print free | grep 'Free Space' | tail -1)"
	local begin=$(echo $rc | awk '{print $1}' | egrep -o '[0-9]+')
	begin=$((begin+1))
	local end=$(echo $rc | awk '{print $2}' | egrep -o '[0-9]+')

	# 创建文件系统
	# TODO：忽略了aligment的提示
	echo Ignore | parted -- $loop_dev unit B mkpart primary ext4 $begin $end

	Create_partition=$loop_dev
}

mount_tarball() {
	local tarball=$1; shift
	local mnt_point=$(uuidgen)
	mnt_point="/mnt/$mnt_point"
	[[ -d $mnt_point ]] || mkdir -p $mnt_point

	#guestmount -a $input_img -i $mnt_point
	tar -xf $tarball -C $mnt_point

	Mount_tarball=$mnt_point
}

mount_output_image() {
	local device=$1; shift
	local mnt_point=$(uuidgen)
	mnt_point="/mnt/$mnt_point"
	[[ -d $mnt_point ]] || mkdir -p $mnt_point

	mount $device $mnt_point

	Mount_output_image=$mnt_point
}

bailout() {
	umount $Mount_output_image
	rmdir $Mount_output_image

	[[ -d $Mount_tarball ]] && rm -rf $Mount_tarball

	kpartx -d $Create_partition
	losetup -d $Create_partition
}

main() {
	echo "check tarball"
	check_tarball

	if [[ ! -n $size ]]; then
		echo "output image size not specified" >&2
		exit 1
	fi

	echo "create output image: $output_img, size: $size"
	qemu-img create -f raw $output_img $size 2>/dev/null >&2

	echo "create partition on $output_img"
	create_partition $output_img

	kpartx -a $Create_partition

	local short_loop_dev=$(echo $Create_partition | sed -e 's%/dev/\(loop[0-9]*\)%\1%')

	if [[ $IMG_FILESYSTEM = "ext3" ]]; then
		mkfs.ext3 -I 128 /dev/mapper/${short_loop_dev}p1
	else
		mkfs.ext4 -E lazy_itable_init=0 /dev/mapper/${short_loop_dev}p1
	fi

	mount_output_image /dev/mapper/${short_loop_dev}p1
	mount_tarball $tarball

	echo "mount tarball on [$Mount_tarball]"
	echo "mount output image on [$Mount_output_image]"

	echo "install grub1 to $output_img"
	bash -x ./install_grub1.sh $output_img $Mount_output_image $Mount_tarball

	bailout
}

main