70 lines
1.6 KiB
Bash
Executable File
70 lines
1.6 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 [ "$DEBUG" ]; then
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set -x
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fi
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. ./image_utils.sh
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. ./shim_utils.sh
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print_help() {
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echo "Usage: ./build.sh output_path shim_path rootfs_dir"
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}
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if [ "$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 "$3" ]; then
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print_help
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exit 1
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fi
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. ./common.sh
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assert_deps "cpio binwalk pcregrep realpath cgpt mkfs.ext4 mkfs.ext2 fdisk rsync"
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output_path=$(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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initramfs_dir=/tmp/shim_initramfs
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rm -rf $initramfs_dir
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extract_initramfs $kernel_dir/kernel.bin $kernel_dir $initramfs_dir
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losetup -d $shim_loop
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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 * 12 / 10))
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#create a 20mb bootloader partition
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#rootfs partition is 20% 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 "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 $image_loop
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echo "done" |