113 lines
2.9 KiB
Bash
Executable File
113 lines
2.9 KiB
Bash
Executable File
#!/bin/bash
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#build the bootloader image
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set -e
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if [ "$DEBUG" ]; then
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set -x
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fi
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. ./patch_initramfs.sh
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. ./build_image.sh
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print_help() {
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echo "Usage: ./build.sh output_path shim_path rootfs_dir"
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}
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check_deps() {
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local needed_commands="cpio binwalk pcregrep realpath cgpt mkfs.ext4 mkfs.ext2 fdisk"
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for command in $needed_commands; do
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if ! command -v $command &> /dev/null; then
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echo $command
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fi
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done
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}
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if [ "$EUID" -ne 0 ]; then
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echo "this needs to be run as root."
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exit 1
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fi
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if [ -z "$3" ]; then
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print_help
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exit 1
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fi
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missing_commands=$(check_deps)
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if [ "${missing_commands}" ]; then
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echo "You are missing dependencies needed for this script."
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echo "Commands needed:"
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echo "${missing_commands}"
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exit 1
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fi
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output_path=$(realpath "${1}")
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shim_path=$(realpath "${2}")
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rootfs_dir=$(realpath "${3}")
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echo "created loop device for shim"
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shim_loop=$(create_loop "${shim_path}")
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kernel_loop="${shim_loop}p2" #KERN-A should always be p2
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echo "copying shim kernel to new file in /tmp"
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kernel_dir=/tmp/shim_kernel
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mkdir $kernel_dir -p
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dd if=$kernel_loop of=$kernel_dir/kernel.bin bs=1M status=none
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echo "extracting data from kernel"
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previous_dir=$(pwd)
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cd $kernel_dir
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if [ -e "${kernel_dir}/binwalk.out" ]; then
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#don't run binwalk again if we don't need to
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binwalk_out=$(cat $kernel_dir/binwalk.out)
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else
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binwalk_out=$(binwalk --extract kernel.bin --run-as=root)
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echo $binwalk_out > $kernel_dir/binwalk.out
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fi
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#i can't be bothered to learn how to use sed
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extracted_file=$(echo $binwalk_out | pcregrep -o1 "\d+\s+0x([0-9A-F]+)\s+gzip compressed data")
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echo "extracting initramfs archive from kernel (this may take a while)"
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cd _kernel.bin.extracted/
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if [ ! -e "_${extracted_file}.extracted/" ]; then
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binwalk --extract $extracted_file --run-as=root > /dev/null
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fi
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cd "_${extracted_file}.extracted/"
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cpio_file=$(file ./* | pcregrep -o1 "([0-9A-F]+):\s+ASCII cpio archive")
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echo "extracting initramfs cpio archive"
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initramfs_dir=/tmp/shim_initramfs
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rm -rf $initramfs_dir
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cat $cpio_file | cpio -D $initramfs_dir -imd --quiet
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echo "shim initramfs extracted to ${initramfs_dir}"
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#leave /tmp
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cd $previous_dir
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echo "patching initramfs"
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patch_initramfs $initramfs_dir
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echo "creating disk image"
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rootfs_size=$(du -sm $rootfs_dir | cut -f 1)
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rootfs_part_size=$(($rootfs_size * 11 / 10 + 50))
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#create a 20mb bootloader partition
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#rootfs partition is 10% larger than its contents
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create_image $output_path 20 $rootfs_part_size
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echo "creating loop device for the image"
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image_loop=$(create_loop ${output_path})
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echo "creating partitions on the disk image"
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create_partitions $image_loop "${kernel_dir}/kernel.bin"
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echo "mounting the original shim rootfs"
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shim_rootfs="/tmp/shim_rootfs"
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make_mountable "${shim_loop}p3"
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safe_mount "${shim_loop}p3" $shim_rootfs
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echo "copying data into the image"
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populate_partitions $image_loop $initramfs_dir $rootfs_dir
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echo "cleaning up loop devices"
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losetup -d $shim_loop
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losetup -d $image_loop |