experimental arm support in build.sh
This commit is contained in:
ading2210
parent
0c73fe2c1c
commit
00132512b5
27
build.sh
27
build.sh
|
|
@ -8,10 +8,13 @@
|
|||
|
||||
print_help() {
|
||||
echo "Usage: ./build.sh output_path shim_path rootfs_dir"
|
||||
echo "Valid named arguments (specify with 'key=value'):"
|
||||
echo " quiet - Don't use progress indicators which may clog up log files."
|
||||
echo " arch - Set this to 'arm64' to specify that the shim is for an ARM chromebook."
|
||||
}
|
||||
|
||||
assert_root
|
||||
assert_deps "cpio binwalk pcregrep realpath cgpt mkfs.ext4 mkfs.ext2 fdisk rsync"
|
||||
assert_deps "cpio binwalk pcregrep realpath cgpt mkfs.ext4 mkfs.ext2 fdisk rsync lz4"
|
||||
assert_args "$3"
|
||||
parse_args "$@"
|
||||
|
||||
|
|
@ -19,27 +22,18 @@ output_path=$(realpath -m "${1}")
|
|||
shim_path=$(realpath -m "${2}")
|
||||
rootfs_dir=$(realpath -m "${3}")
|
||||
|
||||
echo "created loop device for shim"
|
||||
shim_loop=$(create_loop "${shim_path}")
|
||||
kernel_loop="${shim_loop}p2" #KERN-A should always be p2
|
||||
|
||||
echo "copying shim kernel to new file in /tmp"
|
||||
kernel_dir=/tmp/shim_kernel
|
||||
mkdir $kernel_dir -p
|
||||
dd if=$kernel_loop of=$kernel_dir/kernel.bin bs=1M status=none
|
||||
|
||||
echo "extracting data from kernel"
|
||||
echo "reading the shim image"
|
||||
initramfs_dir=/tmp/shim_initramfs
|
||||
rm -rf $initramfs_dir
|
||||
extract_initramfs $kernel_dir/kernel.bin $kernel_dir $initramfs_dir
|
||||
losetup -d $shim_loop
|
||||
kernel_img=/tmp/kernel.img
|
||||
rm -rf $initramfs_dir $kernel_img
|
||||
extract_initramfs_full $shim_path $initramfs_dir $kernel_img "${args['arch']}"
|
||||
|
||||
echo "patching initramfs"
|
||||
patch_initramfs $initramfs_dir
|
||||
|
||||
echo "creating disk image"
|
||||
rootfs_size=$(du -sm $rootfs_dir | cut -f 1)
|
||||
rootfs_part_size=$(($rootfs_size * 12 / 10))
|
||||
rootfs_part_size=$(($rootfs_size * 12 / 10 + 5))
|
||||
#create a 20mb bootloader partition
|
||||
#rootfs partition is 20% larger than its contents
|
||||
create_image $output_path 20 $rootfs_part_size
|
||||
|
|
@ -48,10 +42,11 @@ echo "creating loop device for the image"
|
|||
image_loop=$(create_loop ${output_path})
|
||||
|
||||
echo "creating partitions on the disk image"
|
||||
create_partitions $image_loop "${kernel_dir}/kernel.bin"
|
||||
create_partitions $image_loop $kernel_img
|
||||
|
||||
echo "copying data into the image"
|
||||
populate_partitions $image_loop $initramfs_dir $rootfs_dir "${args['quiet']}"
|
||||
rm -rf $initramfs_dir $kernel_img
|
||||
|
||||
echo "cleaning up loop devices"
|
||||
losetup -d $image_loop
|
||||
|
|
|
|||
|
|
@ -8,14 +8,14 @@ extract_initramfs() {
|
|||
local working_dir="$2"
|
||||
local output_dir="$3"
|
||||
|
||||
#first stage
|
||||
#extract the compressed kernel image from the partition data
|
||||
local kernel_file="$(basename $kernel_bin)"
|
||||
local binwalk_out=$(binwalk --extract $kernel_bin --directory=$working_dir --run-as=root)
|
||||
local stage1_file=$(echo $binwalk_out | pcregrep -o1 "\d+\s+0x([0-9A-F]+)\s+gzip compressed data")
|
||||
local stage1_dir="$working_dir/_$kernel_file.extracted"
|
||||
local stage1_path="$stage1_dir/$stage1_file"
|
||||
|
||||
#second stage
|
||||
#extract the initramfs cpio archive from the kernel image
|
||||
binwalk --extract $stage1_path --directory=$stage1_dir --run-as=root > /dev/null
|
||||
local stage2_dir="$stage1_dir/_$stage1_file.extracted/"
|
||||
local cpio_file=$(file $stage2_dir/* | pcregrep -o1 "([0-9A-F]+):\s+ASCII cpio archive")
|
||||
|
|
@ -25,6 +25,29 @@ extract_initramfs() {
|
|||
cat $cpio_path | cpio -D $output_dir -imd --quiet
|
||||
}
|
||||
|
||||
extract_initramfs_arm() {
|
||||
local kernel_bin="$1"
|
||||
local working_dir="$2"
|
||||
local output_dir="$3"
|
||||
|
||||
#extract the kernel lz4 archive from the partition
|
||||
local binwalk_out="$(binwalk $kernel_bin --run-as=root)"
|
||||
local lz4_offset="$(echo "$binwalk_out" | pcregrep -o1 "(\d+).+?LZ4 compressed data")"
|
||||
local lz4_file="$working_dir/kernel.lz4"
|
||||
local kernel_img="$working_dir/kernel_decompressed.bin"
|
||||
dd if=$kernel_bin of=$lz4_file iflag=skip_bytes,count_bytes skip=$lz4_offset
|
||||
lz4 -d $lz4_file $kernel_img -q || true
|
||||
|
||||
#extract the initramfs cpio archive from the kernel image
|
||||
local extracted_dir="$working_dir/_kernel_decompressed.bin.extracted"
|
||||
binwalk --extract $kernel_img --directory=$working_dir --run-as=root > /dev/null
|
||||
local cpio_file=$(file $extracted_dir/* | pcregrep -o1 "([0-9A-F]+):\s+ASCII cpio archive")
|
||||
local cpio_path="$extracted_dir/$cpio_file"
|
||||
|
||||
rm -rf $output_dir
|
||||
cat $cpio_path | cpio -D $output_dir -imd --quiet
|
||||
}
|
||||
|
||||
copy_kernel() {
|
||||
local shim_path="$1"
|
||||
local kernel_dir="$2"
|
||||
|
|
@ -40,6 +63,8 @@ copy_kernel() {
|
|||
extract_initramfs_full() {
|
||||
local shim_path="$1"
|
||||
local rootfs_dir="$2"
|
||||
local kernel_bin="$3"
|
||||
local arch="$4"
|
||||
local kernel_dir=/tmp/shim_kernel
|
||||
|
||||
echo "copying the shim kernel"
|
||||
|
|
@ -48,6 +73,14 @@ extract_initramfs_full() {
|
|||
copy_kernel $shim_path $kernel_dir
|
||||
|
||||
echo "extracting initramfs from kernel (this may take a while)"
|
||||
extract_initramfs $kernel_dir/kernel.bin $kernel_dir $rootfs_dir
|
||||
if [ "$arch" = "arm64" ]; then
|
||||
extract_initramfs_arm $kernel_dir/kernel.bin $kernel_dir $rootfs_dir
|
||||
else
|
||||
extract_initramfs $kernel_dir/kernel.bin $kernel_dir $rootfs_dir
|
||||
fi
|
||||
|
||||
if [ "$kernel_bin" ]; then
|
||||
cp $kernel_dir/kernel.bin $kernel_bin
|
||||
fi
|
||||
rm -rf $kernel_dir
|
||||
}
|
||||
Loading…
Reference in New Issue