#!/usr/bin/make -f
include /usr/share/dpkg/default.mk
KernelDir=debian/kata-linux-container/usr/share/kata-containers
DebugDir=debian/kata-linux-container-debug/usr/share/kata-containers
KernelVer=${DEB_VERSION_UPSTREAM_REVISION}.container
HOST_ARCH=$(shell arch)
KATA_MULTIARCH="/usr/src/packages/SOURCES/kata-multiarch.sh"
KERNEL_ARCH=$(shell /bin/bash $(KATA_MULTIARCH) -a $(HOST_ARCH))
KERNEL_IMAGE=$(shell /bin/bash $(KATA_MULTIARCH) -i $(HOST_ARCH))
KERNEL_CONFIGS=kata-kernel-configs
KERNEL_FRAG_COMMON_DIR="$(KERNEL_CONFIGS)/fragments/common"
KERNEL_FRAG_ARCH_DIR="$(KERNEL_CONFIGS)/fragments/$(KERNEL_ARCH)"

# used in merge_config.sh
export KCONFIG_CONFIG=.config
export ARCH=$(KERNEL_ARCH)

%:
	dh $@

override_dh_auto_build:
	sed -i "s/^EXTRAVERSION.*/EXTRAVERSION = -$$(echo $(KernelVer) | cut -d'-' -f2)/" Makefile
	tar xzf /usr/src/packages/SOURCES/$(KERNEL_CONFIGS).tar.gz
	rm -f .config
	find $(KERNEL_CONFIGS) -name "$(KERNEL_ARCH)_kata_kvm_*" -exec cp {} .config \;
	if [ ! -f .config ]; then \
		scripts/kconfig/merge_config.sh -r -n $(KERNEL_FRAG_COMMON_DIR)/* $(KERNEL_FRAG_ARCH_DIR)/* ; \
		if [ ! -f .config ]; then \
			echo "ERROR: cannot find the kernel config file for the $(KERNEL_ARCH) architecture"; \
			exit 1; \
		fi \
	fi

	# https://github.com/kata-containers/packaging/issues/394 enable reproducible builds:
	export KBUILD_BUILD_USER=katabuilduser
	export KBUILD_BUILD_HOST=katabuildhost
        # Default to zero seconds after midnight 1970-01-01 (the epoch)
	export KBUILD_BUILD_TIMESTAMP="$(LANG=C date -u -d "@${SOURCE_DATE_EPOCH:-0}")"
	make -s ARCH=$(KERNEL_ARCH) oldconfig > /dev/null
	make -s CONFIG_DEBUG_SECTION_MISMATCH=y ARCH=$(KERNEL_ARCH)

override_dh_auto_install:

override_dh_auto_clean:

override_dh_install:
	dh_install
	mkdir -p $(DebugDir)
	mkdir -p $(KernelDir)
	install -m 644 .config $(DebugDir)/config-$(KernelVer)
	install -m 644 System.map $(DebugDir)/System.map-$(KernelVer)
	if [ -n "$(KERNEL_IMAGE)" ]; then \
		cp $$(realpath $(KERNEL_IMAGE))  $(KernelDir)/vmlinuz-$(KernelVer); \
		chmod 755 $(KernelDir)/vmlinuz-$(KernelVer); \
		ln -sf vmlinuz-$(KernelVer) $(KernelDir)/vmlinuz.container; \
	fi
	cp vmlinux $(KernelDir)/vmlinux-$(KernelVer)
	chmod 755 $(KernelDir)/vmlinux-$(KernelVer)
	ln -sf vmlinux-$(KernelVer) $(KernelDir)/vmlinux.container

override_dh_strip:

override_dh_shlibdeps: