Jan De Landtsheer
8c3868b242
- Remove duplicate /sbin/init copying from initramfs_setup_zinit() - Only /init should be config/init (initramfs setup script) - No /sbin/init needed - config/init calls 'switch_root /mnt/root /sbin/zinit init' - Remove unsupported cpio --owner option that broke CPIO creation - Fix validation to not expect /sbin/init file - Correct boot flow: /init → switch_root → /sbin/zinit init - Remove strip and UPX compression from zinit binary copying - UPX compression was corrupting the zinit binary causing segfaults after switch_root - Keep zinit unmodified as it's
308 lines
10 KiB
Bash
308 lines
10 KiB
Bash
#!/bin/bash
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# Kernel building with embedded initramfs
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# Source common functions
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LIB_SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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source "${LIB_SCRIPT_DIR}/common.sh"
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# Kernel configuration
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KERNEL_VERSION="${KERNEL_VERSION:-6.12.44}"
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KERNEL_SOURCE_URL="${KERNEL_SOURCE_URL:-https://cdn.kernel.org/pub/linux/kernel}"
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KERNEL_CONFIG_SOURCE="${KERNEL_CONFIG_SOURCE:-${PROJECT_ROOT}/configs/kernel-config-generic}"
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# Get actual kernel version including LOCALVERSION from kernel config
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function kernel_get_full_version() {
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local base_version="${1:-$KERNEL_VERSION}"
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local config_file="${2:-${PROJECT_ROOT}/config/kernel.config}"
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# Extract LOCALVERSION from kernel config
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local localversion=""
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if [[ -f "$config_file" ]] && grep -q "^CONFIG_LOCALVERSION=" "$config_file"; then
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localversion=$(grep "^CONFIG_LOCALVERSION=" "$config_file" | cut -d'"' -f2)
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fi
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echo "${base_version}${localversion}"
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}
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# Download kernel source
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function kernel_download_source() {
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local kernel_dir="$1"
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local version="${2:-$KERNEL_VERSION}"
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section_header "Downloading Kernel Source"
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local major_version=$(echo "$version" | cut -d. -f1)
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local url="${KERNEL_SOURCE_URL}/v${major_version}.x/linux-${version}.tar.xz"
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local temp_file="/tmp/linux-${version}.tar.xz"
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local source_dir="${kernel_dir}/linux-${version}"
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log_info "Kernel version: ${version}"
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log_info "Download URL: ${url}"
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log_info "Target directory: ${kernel_dir}"
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# Clean existing kernel directory
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if [[ -d "$kernel_dir" ]]; then
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log_info "Cleaning existing kernel directory"
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safe_rmdir "$kernel_dir"
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fi
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safe_mkdir "$kernel_dir"
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# Download kernel source
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if [[ ! -f "$temp_file" ]]; then
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log_info "Downloading kernel source: ${version}"
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safe_execute wget --progress=dot:giga -O "$temp_file" "$url"
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else
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log_info "Using cached kernel source: ${temp_file}"
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fi
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# Verify download
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local file_size=$(get_file_size "$temp_file")
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log_info "Kernel source size: ${file_size}"
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# Extract kernel source
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log_info "Extracting kernel source"
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safe_execute tar -xJf "$temp_file" -C "$kernel_dir"
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# Verify extraction
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if [[ ! -d "$source_dir" ]]; then
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log_error "Kernel source extraction failed"
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return 1
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fi
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# Create symlink for easier access
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safe_execute ln -sf "linux-${version}" "${kernel_dir}/current"
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# Cleanup download
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safe_execute rm "$temp_file"
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log_info "Kernel source download complete: ${source_dir}"
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}
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# Apply kernel configuration with embedded initramfs
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function kernel_apply_config() {
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local kernel_dir="$1"
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local initramfs_path="$2"
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local config_source="${3:-$KERNEL_CONFIG_SOURCE}"
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section_header "Applying Kernel Configuration"
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local source_dir="${kernel_dir}/current"
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if [[ ! -d "$source_dir" ]]; then
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log_error "Kernel source directory not found: ${source_dir}"
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return 1
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fi
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if [[ ! -f "$config_source" ]]; then
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log_error "Kernel config source not found: ${config_source}"
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return 1
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fi
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if [[ ! -f "$initramfs_path" ]]; then
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log_error "Initramfs file not found: ${initramfs_path}"
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return 1
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fi
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safe_execute cd "$source_dir"
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# Copy base configuration
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log_info "Copying kernel configuration from: ${config_source}"
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safe_copy "$config_source" ".config"
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# Update configuration for embedded initramfs
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log_info "Updating configuration for embedded initramfs"
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log_info "Initramfs path: ${initramfs_path}"
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# Resolve absolute path for initramfs
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local abs_initramfs_path=$(resolve_path "$initramfs_path")
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# Modify config for embedded initramfs
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kernel_modify_config_for_initramfs "$abs_initramfs_path"
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# Run olddefconfig to apply defaults for any new options
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log_info "Running olddefconfig to finalize configuration"
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safe_execute make olddefconfig
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log_info "Kernel configuration applied successfully"
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}
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# Modify kernel config for embedded initramfs
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function kernel_modify_config_for_initramfs() {
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local initramfs_path="$1"
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log_info "Modifying kernel config for embedded initramfs"
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# Use sed to update configuration (execute directly to avoid quote issues)
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log_info "Setting INITRAMFS_SOURCE to: ${initramfs_path}"
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if ! sed -i "s|^CONFIG_INITRAMFS_SOURCE=.*|CONFIG_INITRAMFS_SOURCE=\"${initramfs_path}\"|" .config; then
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log_error "Failed to set INITRAMFS_SOURCE in kernel config"
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return 1
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fi
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# Ensure XZ compression is enabled for initramfs
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log_info "Enabling XZ decompression support"
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if ! sed -i 's|^# CONFIG_RD_XZ is not set|CONFIG_RD_XZ=y|' .config; then
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log_warn "Could not enable CONFIG_RD_XZ (may already be set)"
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fi
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log_info "Setting initramfs compression to XZ"
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if ! sed -i 's|^CONFIG_INITRAMFS_COMPRESSION_NONE=y|# CONFIG_INITRAMFS_COMPRESSION_NONE is not set|' .config; then
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log_warn "Could not disable INITRAMFS_COMPRESSION_NONE (may already be disabled)"
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fi
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if ! sed -i 's|^# CONFIG_INITRAMFS_COMPRESSION_XZ is not set|CONFIG_INITRAMFS_COMPRESSION_XZ=y|' .config; then
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log_warn "Could not enable INITRAMFS_COMPRESSION_XZ (may already be set)"
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fi
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# Verify critical settings
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if ! grep -q "CONFIG_INITRAMFS_SOURCE=\"${initramfs_path}\"" .config; then
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log_error "Failed to set INITRAMFS_SOURCE in kernel config"
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return 1
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fi
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# Check if XZ support is available (either RD_XZ or built-in)
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if grep -q "CONFIG_RD_XZ=y" .config || grep -q "CONFIG_KERNEL_XZ=y" .config; then
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log_info "✓ XZ decompression support confirmed"
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else
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log_warn "XZ decompression support not confirmed, kernel may not boot"
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fi
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log_info "Kernel config updated for embedded initramfs"
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}
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# Build kernel with embedded initramfs
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function kernel_build_with_initramfs() {
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local kernel_config="$1"
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local initramfs_path="$2"
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local output_file="$3"
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local kernel_dir="${4:-${PROJECT_ROOT}/kernel}"
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section_header "Building Kernel with Embedded Initramfs"
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# Download kernel source if needed
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if [[ ! -d "${kernel_dir}/current" ]]; then
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kernel_download_source "$kernel_dir"
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fi
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# Apply configuration
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kernel_apply_config "$kernel_dir" "$initramfs_path" "$kernel_config"
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local source_dir="${kernel_dir}/current"
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safe_execute cd "$source_dir"
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# Determine number of cores for parallel build
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local cores=$(nproc)
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local jobs=$((cores > 1 ? cores - 1 : 1)) # Leave one core free
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log_info "Building with ${jobs} parallel jobs"
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# Build kernel
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log_info "Building kernel (this may take a while)..."
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safe_execute make -j${jobs} bzImage
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# Verify kernel was built
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local kernel_image="arch/x86/boot/bzImage"
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if [[ ! -f "$kernel_image" ]]; then
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log_error "Kernel build failed - bzImage not found"
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return 1
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fi
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# Copy to output location
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local output_dir=$(dirname "$output_file")
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safe_mkdir "$output_dir"
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safe_copy "$kernel_image" "$output_file"
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# Verify final kernel
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local kernel_size=$(get_file_size "$output_file")
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log_info "Kernel build complete:"
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log_info " Output file: ${output_file}"
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log_info " Kernel size: ${kernel_size}"
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# Verify initramfs is embedded
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if strings "$output_file" | grep -q "initramfs"; then
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log_info "✓ Initramfs appears to be embedded in kernel"
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else
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log_warn "Initramfs embedding verification inconclusive"
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fi
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}
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# Build and install modules in container for proper dependency resolution
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function kernel_build_modules() {
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local kernel_dir="$1"
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local initramfs_dir="$2"
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local base_version="${3:-$KERNEL_VERSION}"
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section_header "Building Kernel Modules in Container"
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local source_dir="${kernel_dir}/current"
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if [[ ! -d "$source_dir" ]]; then
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log_error "Kernel source directory not found: ${source_dir}"
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return 1
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fi
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safe_execute cd "$source_dir"
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# Get the full kernel version including LOCALVERSION
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local full_version=$(kernel_get_full_version "$base_version" "${PROJECT_ROOT}/config/kernel.config")
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log_info "Base kernel version: ${base_version}"
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log_info "Full kernel version: ${full_version}"
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# Build modules
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local cores=$(nproc)
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local jobs=$((cores > 1 ? cores - 1 : 1))
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log_info "Building kernel modules with ${jobs} parallel jobs"
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safe_execute make -j${jobs} modules
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# Install modules in container for proper modinfo/depmod access
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local container_modules_dir="/lib/modules"
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log_info "Installing modules in container: ${container_modules_dir}"
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safe_execute make modules_install INSTALL_MOD_PATH=/
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# Run depmod in container context for proper dependency resolution
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log_info "Running depmod in container for ${full_version}"
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safe_execute depmod -a "$full_version"
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# Verify module installation in container
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if [[ -d "/lib/modules/${full_version}" ]]; then
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local module_count=$(find "/lib/modules/${full_version}" -name "*.ko*" | wc -l)
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log_info "Container modules installed: ${module_count} modules in /lib/modules/${full_version}"
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# Export the container modules path for dependency resolution
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export CONTAINER_MODULES_PATH="/lib/modules/${full_version}"
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export KERNEL_FULL_VERSION="$full_version"
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log_info "Module dependency resolution will use: ${CONTAINER_MODULES_PATH}"
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else
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log_error "Module installation in container failed"
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return 1
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fi
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log_info "Kernel modules build and container installation complete"
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}
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# Clean kernel build artifacts
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function kernel_cleanup() {
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local kernel_dir="$1"
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local keep_source="${2:-false}"
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section_header "Cleaning Kernel Build Artifacts"
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if [[ "$keep_source" == "true" ]]; then
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log_info "Keeping source, cleaning build artifacts only"
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local source_dir="${kernel_dir}/current"
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if [[ -d "$source_dir" ]]; then
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safe_execute cd "$source_dir"
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safe_execute make clean
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fi
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else
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log_info "Removing entire kernel directory"
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safe_rmdir "$kernel_dir"
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fi
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log_info "Kernel cleanup complete"
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}
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# Export functions
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export -f kernel_download_source kernel_apply_config kernel_modify_config_for_initramfs
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export -f kernel_build_with_initramfs kernel_build_modules kernel_cleanup kernel_get_full_version
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