126 lines
3.2 KiB
Bash
Executable File
126 lines
3.2 KiB
Bash
Executable File
#!/bin/bash
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set -e
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if [ "$DEBUG" ]; then
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set -x
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fi
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create_loop() {
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local loop_device=$(losetup -f)
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losetup -P $loop_device "${1}"
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echo $loop_device
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}
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#useful in the future... maybe
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make_mountable() {
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sh lib/ssd_util.sh --no_resign_kernel --remove_rootfs_verification -i $1
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printf '\000' | dd of=$1 seek=$((0x464 + 3)) conv=notrunc count=1 bs=1
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}
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partition_disk() {
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local image_path=$(realpath "${1}")
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local bootloader_size=${2}
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#create partition table with fdisk
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(
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echo g #new gpt disk label
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#create 1MB stateful
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echo n #new partition
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echo #accept default parition number
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echo #accept default first sector
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echo +1M #partition size is 1M
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#create 32MB kernel partition
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echo n
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echo #accept default parition number
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echo #accept default first sector
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echo +32M #partition size is 32M
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echo t #change partition type
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echo #accept default parition number
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echo FE3A2A5D-4F32-41A7-B725-ACCC3285A309 #chromeos kernel type
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#create bootloader partition
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echo n
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echo #accept default parition number
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echo #accept default first sector
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echo "+${bootloader_size}M" #set partition size
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echo t #change partition type
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echo #accept default parition number
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echo 3CB8E202-3B7E-47DD-8A3C-7FF2A13CFCEC #chromeos rootfs type
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#create rootfs partition
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echo n
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echo #accept default parition number
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echo #accept default first sector
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echo #accept default size to fill rest of image
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#write changes
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echo w
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) | fdisk $image_path
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}
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safe_mount() {
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umount $2 || /bin/true
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rm -rf $2
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mkdir -p $2
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mount $1 $2
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}
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create_partitions() {
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local image_loop=$(realpath "${1}")
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local kernel_path=$(realpath "${2}")
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#create stateful
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mkfs.ext4 "${image_loop}p1"
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#copy kernel
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dd if=$kernel_path of="${image_loop}p2" bs=1M oflag=sync
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#create bootloader partition
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mkfs.ext2 "${image_loop}p3"
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#create rootfs partition
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mkfs.ext4 "${image_loop}p4"
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}
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populate_partitions() {
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local image_loop=$(realpath "${1}")
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local bootloader_dir=$(realpath "${2}")
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local rootfs_dir=$(realpath "${3}")
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#mount and write empty file to stateful
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local stateful_mount=/tmp/shim_stateful
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safe_mount "${image_loop}p1" $stateful_mount
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mkdir -p $stateful_mount/dev_image/etc/
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touch $stateful_mount/dev_image/etc/lsb-factory
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umount $stateful_mount
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#mount and write to bootloader rootfs
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local bootloader_mount=/tmp/shim_bootloader
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safe_mount "${image_loop}p3" $bootloader_mount
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cp -r $bootloader_dir/* $bootloader_mount
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umount $bootloader_mount
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local rootfs_mount=/tmp/shim_rootfs
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safe_mount "${image_loop}p4" $rootfs_mount
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cp -r $rootfs_dir/* $rootfs_mount
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umount $rootfs_mount
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}
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create_image() {
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local image_path=$(realpath "${1}")
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local bootloader_size=${2}
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local rootfs_size=${3}
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#stateful + kernel + bootloader + rootfs
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local total_size=$((1 + 32 + $bootloader_size + $rootfs_size))
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dd if=/dev/zero of=$image_path bs=1M oflag=sync count=$total_size status=progress
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partition_disk $image_path $bootloader_size
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}
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if [ $0 == "./build_image.sh" ]; then
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create_image ./test.bin 20 200
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image_loop=$(create_loop ./test.bin)
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create_partitions $image_loop /tmp/shim_kernel/kernel.bin
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populate_partitions $image_loop ./tmp/shim_initramfs ./lib
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losetup -d $image_loop
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fi |