extract modules to squashfs

This commit is contained in:
ading2210 2023-12-20 22:48:32 -08:00
parent 2995760db4
commit e399ef002e
2 changed files with 78 additions and 1 deletions

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@ -5,6 +5,76 @@
# - FUSE kernel modules from the shim # - FUSE kernel modules from the shim
# - unionfs-fuse statically compiled # - unionfs-fuse statically compiled
# - the main squashfs, compressed with gzip # - the main squashfs, compressed with gzip
#this script is currently incomplete
set -e
if [ "$DEBUG" ]; then
set -x
fi
#todo - gotta refactor the other build scripts first . ./image_utils.sh
. ./shim_utils.sh
print_help() {
echo "Usage: ./build_squashfs.sh rootfs_dir uncompressed_rootfs_dir path_to_shim"
}
if [ "$EUID" -ne 0 ]; then
echo "this needs to be run as root."
exit 1
fi
if [ -z "$3" ]; then
print_help
exit 1
fi
compile_unionfs() {
local out_path="$1"
local working_path="$2"
local repo_url="https://github.com/rpodgorny/unionfs-fuse"
local original_dir="$(pwd)"
rm -rf $working_path
git clone $repo_url -b master --depth=1 $working_path
cd $working_path
env LDFLAGS="-static" make
local binary_path="$working_path/src/unionfs"
cp $binary_path $out_path
}
rootfs_dir=$(realpath $1)
target_dir=$(realpath $2)
shim_path=$(realpath $3)
shim_rootfs="/tmp/shim_rootfs"
modules_squashfs="/tmp/modules.squashfs"
kernel_dir=/tmp/shim_kernel
initramfs_dir=/tmp/shim_initramfs
echo "compiling unionfs-fuse"
compile_unionfs /tmp/unionfs /tmp/unionfs-fuse
echo "mounting shim"
shim_loop=$(create_loop "${shim_path}")
make_mountable "${shim_loop}p3"
safe_mount "${shim_loop}p3" $shim_rootfs
echo "extracting modules from shim"
extract_modules $modules_squashfs $shim_rootfs
echo "copying shim kernel"
mkdir $kernel_dir -p
kernel_loop="${shim_loop}p2"
dd if=$kernel_loop of=$kernel_dir/kernel.bin bs=1M status=none
echo "extracting initramfs from kernel"
extract_initramfs $kernel_dir/kernel.bin $kernel_dir $rootfs_dir
#todo...
echo "cleaning up"
umount $shim_rootfs
losetup -d $shim_loop

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@ -23,3 +23,10 @@ extract_initramfs() {
rm -rf $output_dir rm -rf $output_dir
cat $cpio_path | cpio -D $output_dir -imd --quiet cat $cpio_path | cpio -D $output_dir -imd --quiet
} }
extract_modules() {
local output_path="$1"
local shim_rootfs="$2"
local modules_dir="$shim_rootfs/lib/modules"
mksquashfs $modules_dir $output_path -noappend -comp gzip
}