68 lines
1.6 KiB
Bash
Executable File
68 lines
1.6 KiB
Bash
Executable File
#!/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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set -e
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if [ "$DEBUG" ]; then
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set -x
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fi
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. ./common.sh
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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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assert_root
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assert_deps "git make gcc binwalk pcregrep"
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assert_args "$3"
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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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local core_count="$(nproc --all)"
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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 $working_path
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env LDFLAGS="-static" CFLAGS="-O3" make -j$core_count
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local binary_path="$working_path/src/unionfs"
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cp $binary_path $out_path
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cd $original_dir
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}
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rootfs_dir=$(realpath -m $1)
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old_dir=$(realpath -m $2)
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shim_path=$(realpath -m $3)
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shim_rootfs="/tmp/shim_rootfs"
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root_squashfs="$rootfs_dir/root.squashfs"
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modules_squashfs="$rootfs_dir/modules.squashfs"
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unionfs_dir="/tmp/unionfs-fuse"
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print_info "compiling unionfs-fuse"
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compile_unionfs $unionfs_dir/unionfs $unionfs_dir
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print_info "reading the shim image"
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extract_initramfs_full $shim_path $rootfs_dir
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rm -rf $rootfs_dir/init
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print_info "compressing old rootfs"
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mksquashfs $old_dir $root_squashfs -noappend -comp gzip
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print_info "patching new rootfs"
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mv $unionfs_dir/unionfs $rootfs_dir/bin/unionfs
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cp -ar squashfs/* $rootfs_dir/
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chmod +x $rootfs_dir/bin/*
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print_info "done" |