2023-12-21 01:05:17 -05:00
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#!/bin/bash
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#build a rootfs that uses a squashfs + unionfs
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#consists of a minimal busybox system containing:
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# - FUSE kernel modules from the shim
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# - unionfs-fuse statically compiled
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# - the main squashfs, compressed with gzip
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2023-12-21 01:48:32 -05:00
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#this script is currently incomplete
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2023-12-21 01:05:17 -05:00
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2023-12-21 01:48:32 -05:00
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set -e
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if [ "$DEBUG" ]; then
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set -x
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fi
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2023-12-21 01:05:17 -05:00
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2023-12-21 01:48:32 -05:00
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. ./image_utils.sh
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. ./shim_utils.sh
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print_help() {
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echo "Usage: ./build_squashfs.sh rootfs_dir uncompressed_rootfs_dir path_to_shim"
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}
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if [ "$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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compile_unionfs() {
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local out_path="$1"
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local working_path="$2"
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local repo_url="https://github.com/rpodgorny/unionfs-fuse"
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local original_dir="$(pwd)"
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rm -rf $working_path
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git clone $repo_url -b master --depth=1 $working_path
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cd $working_path
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env LDFLAGS="-static" make
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local binary_path="$working_path/src/unionfs"
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cp $binary_path $out_path
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}
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rootfs_dir=$(realpath $1)
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target_dir=$(realpath $2)
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shim_path=$(realpath $3)
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shim_rootfs="/tmp/shim_rootfs"
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modules_squashfs="/tmp/modules.squashfs"
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kernel_dir=/tmp/shim_kernel
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initramfs_dir=/tmp/shim_initramfs
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echo "compiling unionfs-fuse"
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compile_unionfs /tmp/unionfs /tmp/unionfs-fuse
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echo "mounting shim"
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shim_loop=$(create_loop "${shim_path}")
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make_mountable "${shim_loop}p3"
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safe_mount "${shim_loop}p3" $shim_rootfs
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echo "extracting modules from shim"
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extract_modules $modules_squashfs $shim_rootfs
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echo "copying shim kernel"
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mkdir $kernel_dir -p
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kernel_loop="${shim_loop}p2"
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dd if=$kernel_loop of=$kernel_dir/kernel.bin bs=1M status=none
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echo "extracting initramfs from kernel"
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extract_initramfs $kernel_dir/kernel.bin $kernel_dir $rootfs_dir
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#todo...
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echo "cleaning up"
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umount $shim_rootfs
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losetup -d $shim_loop
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