From d9c82ead8e9e61ce5f3b4c7ecae16ca418eddc32 Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Wed, 24 Jul 2019 11:36:06 +0200
Subject: [builder] introduce --kernel-headers|-h

to specify the path to kernel headers to build dnbd3 against. Also
remove hacky patch and just directly use dnbd3's KERNEL_DIR CMAKE flag.
---
 builder/build-initramfs.sh | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/builder/build-initramfs.sh b/builder/build-initramfs.sh
index aefc6544..7d56b787 100755
--- a/builder/build-initramfs.sh
+++ b/builder/build-initramfs.sh
@@ -351,6 +351,17 @@ parse_command_line() {
                 fi
                 shift
                 ;;
+            -h|--kernel-headers)
+                local given_argument="$1"
+                shift
+                kernel_headers="$1"
+                if [ -z "$kernel_headers" ]; then
+                    logging.critical \
+                        "Error with given option \"$given_argument\": This option needs the path to the kernel headers."
+                    return 1
+                fi
+                shift
+                ;;
             -)
                 shift
                 while [[ "$1" =~ ^.+$ ]]; do
@@ -495,9 +506,7 @@ initialize_dnbd3_rootfs_module() {
         if [[ ! -f "${_deps_base_dir}/dnbd3/build/dnbd3.ko" ]] || \
             [[ ! -f "${_deps_base_dir}/dnbd3/build/dnbd3-client" ]]; then
             logging.info "Could not find dnbd3, building it..."
-            # fallback to running kernel if the kernel version was not
-            # specified as the dracut argument '--kver'
-            if ! CMAKE_FLAGS="-DKERNEL_VERSION=${kernel_version}" \
+            if ! CMAKE_FLAGS="-DKERNEL_DIR=${kernel_headers}" \
                 build_compile_dnbd3 "${_deps_base_dir}/dnbd3/"; then
                 logging.error "Failed to build dnbd3."
                 return 1
@@ -552,13 +561,17 @@ main() {
     if [ -z "$kernel_version" ]; then
        kernel_version="$(uname -r)"
     fi
+    # similar for kernel headers needed to compile dnbd3 against.
+    if [ -z "$kernel_headers" ]; then
+       kernel_headers="/lib/modules/${kernel_version}/build"
+    fi
+    if [ ! -f "${kernel_headers}/Makefile" ]; then
+       logging.critical 'Missing core dependency "linux-headers" for version to compile against given or current kernel.'
+    fi
+    logging.info "Building for kernel version: ${kernel_version}."
     # endregion
     # region dependency checks and command line parsing
-    logging.info "Building for kernel version: ${kernel_version}."
     result=0
-    if ! [ -f "/lib/modules/${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=$?
     dependency_check core shared_library_pattern_dependencies \
-- 
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