introduce --kernel-version option

to specify the kernel version to build the initramfs for.

1 files changed, 25 insertions, 5 deletions

diff --git a/builder/build-initramfs.sh b/builder/build-initramfs.sh
index 2addea63..fa957721 100755
--- a/builder/build-initramfs.sh
+++ b/builder/build-initramfs.sh
@@ -159,6 +159,10 @@ print_command_line_option_description() {
     explicitly specified current system will be used as template system
     (default: "$target").
 
+-k --kernel-version Creates an image for the given kernel version. Will
+    require the presence of kernel headers for this version.
+    (default: "$(uname -r)")
+
 -s --use-systemd-in-initramfs Use Systemd as init process in initramfs
     (improved performance but less features)
     (default: "$use_systemd_in_initramfs").
@@ -331,11 +335,21 @@ parse_command_line() {
                 shift
                 initialize='yes'
                 ;;
+            -k|--kernel-version)
+                local given_argument="$1"
+                shift
+                kernel_version="$1"
+                if [ -z "$kernel_version" ]; then
+                    logging.critical \
+                        "Error with given option \"$given_argument\": This option needs a kernel version to build the initramfs for."
+                    return 1
+                fi
+                shift
+                ;;
             -)
                 shift
                 while [[ "$1" =~ ^.+$ ]]; do
                     dracut_parameter+=("$1")
-                    [ "$1" == "--kver" ] && kernel_version="$2"
                     shift
                 done
                 ;;
@@ -468,7 +482,6 @@ initialize_dnbd3_rootfs_module() {
             logging.info "Could not find dnbd3, building it..."
             # fallback to running kernel if the kernel version was not
             # specified as the dracut argument '--kver'
-            [ -z "$kernel_version" ] && kernel_version="$(uname -r)"
             if ! CMAKE_FLAGS="-DKERNEL_VERSION=${kernel_version}" \
                 build_compile_dnbd3 "${_deps_base_dir}/dnbd3/"; then
                 logging.error "Failed to build dnbd3."
@@ -519,10 +532,17 @@ main() {
     `main`
     '
     exceptions.activate
+    # region sanity check kernel version
+    # if no kernel was specified as dracut argument, use the running kernel's version
+    if [ -z "$kernel_version" ]; then
+       kernel_version="$(uname -r)"
+    fi
+    # endregion
     # region dependency checks and command line parsing
+    logging.info "Building for kernel version: ${kernel_version}."
     result=0
-    if ! [ -f "/lib/modules/$(uname --kernel-release)/build/Makefile" ]; then
-        logging.critical 'Missing core dependency "linux-headers" to compile against given or current kernel.'
+    if ! [ -f "/lib/modules/${kernel_version}/build/Makefile" ]; then
+        logging.critical 'Missing core dependency "linux-headers" for version to compile against given or current kernel.'
     fi
     dependency_check core dependencies utils_dependency_check program || \
         result=$?
@@ -679,7 +699,7 @@ main() {
         "${_root_dir}/dracut/dracut.sh" --local \
             $_loglevel --modules "$_modules" --conf /etc/dracut.conf \
             --confdir /etc/dracut.conf.d "${dracut_parameter[@]}" \
-            "$file_path"
+            --kver "${kernel_version}" "$file_path"
         _return_code=$?
         logging.set_commands_level "$_commands_log_level_backup"
         logging.set_level "$_log_level_backup"