include config.mk

SRC_DIR=linux-source
VERSION=$(shell $(MAKE) -s -C $(SRC_DIR) kernelversion)
BZIMAGE=archives/bzImage.$(VERSION)
CONFIG_REPO=kernel-config
KERNEL.CONFIG=$(shell realpath "$(CONFIG_REPO)/kernel.config")
TESTED_HASH=.bzImage_tested.sha512
VIRSH_TEST_SCRIPT=./scripts/test_libvirt.expect
DEBVM_TEST_SCRIPT=./scripts/test_debvm.expect
DEBVM_IMG_DIR=/tmp
DEBVM_DISK=$(DEBVM_IMG_DIR)/vz5_kernel_test.ext4
DEBVM_SWAPFILE=$(DEBVM_IMG_DIR)/vz5_kernel_test.swapfile
DEBVM_SWAPLABEL=testswap
UPGRADE_SCRIPT=./scripts/upgrade.sh
HASH=sha512sum

CRED=$(shell tput setaf 1)
CGRN=$(shell tput setaf 2)
CRAZ=$(shell tput sgr0)


ARCHIVE=archives/install_$(shell date "+%Y_%m_%dT%H_%M_%S")_$(VERSION)

all: status

status:
	@echo "Images :\n========\n";
	@[ -f "bzImage.latest" ] && echo 'Latest    : $(shell [ -f "bzImage.latest" ] && file -L bzImage.latest | cut -d ',' -f2)' || echo "Latest : $(CRED)None built$(CRAZ)";
	@[ -f "$(BZIMAGE_INSTALL)" ] && echo 'Installed : $(shell [ -f "$(BZIMAGE_INSTALL)" ] && file -L $(BZIMAGE_INSTALL) | cut -d ',' -f2)' || echo "Installed : $(CRED)None installed$(CRAZ)";
	@[ -f "$(BZIMAGE_TEST)" ] && echo 'In test   : $(shell [ -f "$(BZIMAGE_TEST)" ] && file -L $(BZIMAGE_TEST) | cut -d ',' -f2)' || echo "In test : $(CRED)None in test$(CRAZ)";
	@echo "\nLatest tested :\n----------";
	@[ -f "bzImage.latest" ] && $(MAKE) -s tested || true;
	@echo "\nSources :\n=========";
	@sh $(UPGRADE_SCRIPT) check >/dev/null \
		&& echo "$(CGRN)Kernel sources are up to date$(CRAZ)" \
		|| echo "$(CRED)Kernel sources can be upgraded$(CRAZ)";
	@echo "\nKernel config git repo :\n========================"
	@git -C $(CONFIG_REPO) status


$(SRC_DIR)/.config: $(KERNEL.CONFIG)
	cp -v "$<" "$@"

$(KERNEL.CONFIG): $(SRC_DIR)/.config
	cp -v "$<" "$@"

$(CONFIG_REPO):
	mkdir $(CONFIG_REPO) && git -C $(CONFIG_REPO) init;

menuconfig: $(SRC_DIR)/.config
	$(MAKE) -C $(SRC_DIR) menuconfig

$(BZIMAGE): $(SRC_DIR)/.config
	$(MAKE) -C $(SRC_DIR);
	mkdir -p archives/;
	cp "$(SRC_DIR)/arch/x86_64/boot/bzImage" "$@";
	ln -vfs "$@" bzImage.latest
	ls -lah "$@"

upgrade_src:
	sh $(UPGRADE_SCRIPT)

can_upgrade:
	@sh $(UPGRADE_SCRIPT) check || echo "$(CRED)Kernel sources can be ugraded$(CRAZ)";

kernel: can_upgrade $(BZIMAGE)

commit-config: tested $(KERNEL.CONFIG) can_upgrade
	cp -v "$(SRC_DIR)/.config" "$(KERNEL.CONFIG)";
	git -C $(CONFIG_REPO) add "$(KERNEL.CONFIG)";
	git -C $(CONFIG_REPO) commit -m "Update config for kernel $(VERSION)";
	git -C $(CONFIG_REPO) tag -fa "$(VERSION)" -m "$(shell date -Is) Config for kernel $(VERSION)";

archives/:
	mkdir -p archives;

archive:
	mkdir -p $(ARCHIVE);
	cp -v $(BZIMAGE) $(ARCHIVE)/bzImage.new;
	cp -v $(BZIMAGE_INSTALL) $(ARCHIVE)/bzImage.old;


clean:
	-rm -v $(BZIMAGE) bzImage.latest "$(DEBVM_SWAPFILE)" "$(DEBVM_DISK)" "$(TESTED_HASH)";
	$(MAKE) -C $(SRC_DIR) clean;

distclean:
	-rm -R "$(shell realpath $(SRC_DIR))" "$(SRC_DIR)"

.PHONY: can_upgrade distclean clean $(BZIMAGE_TEST) $(BZIMAGE_INSTALL) _test tested install

tested:
	@$(HASH) -c "$(TESTED_HASH)" 2>/dev/null || {\
		echo "$(CRED)$(BZIMAGE) is not tested.";\
		echo "run make test as root.$(CRAZ)";\
		false;\
	};

_test:
	if $(MAKE) is_root >/dev/null 2>/dev/null; then \
	     	$(MAKE) _virsh_test;\
	else\
		$(MAKE) _debvm_test;\
	fi

test: _test
	$(HASH) "$(BZIMAGE)" > "$(TESTED_HASH)";

# non-privileged user tests

$(DEBVM_DISK): $(BZIMAGE)
	@debvm-create -r stable -o "$@" -h "$(TEST_VM_HOSTNAME)" \
		--skip autologin --skip kernel --skip systemdnetwork -- \
		--customize-hook="echo \"LABEL=$(DEBVM_SWAPLABEL) none swap sw 0 0\" >> \$$1/etc/fstab"\
		--customize-hook="mkdir -p \$$1/etc/network; echo \"auto enp0s2\niface enp0s2 inet dhcp\" > \$$1/etc/network/interfaces" \
		--include="udev" \
		--include="iputils-ping iproute2 ifupdown isc-dhcp-client" \
		--include="ssh qemu-guest-agent tzdata initscripts ntpdate ca-certificates console-setup console-common console-data locales acpid vim screen bash-completion rsyslog" \
		|| { rm "$@"; false;}

$(DEBVM_SWAPFILE):
	dd if=/dev/zero "of=$@" bs=4096 count=32768 status=progress &&\
		chmod 0600 "$@" &&\
		/usr/sbin/mkswap -L "$(DEBVM_SWAPLABEL)" "$@"

_debvm_test: $(DEBVM_DISK) $(DEBVM_SWAPFILE)
	@$(DEBVM_TEST_SCRIPT) "$(TEST_VM_HOSTNAME)" "$(VERSION)" "$(DEBVM_DISK)" "$(BZIMAGE)" "$(DEBVM_SWAPFILE)" "$(DEBVM_SWAPLABEL)" \
		|| echo "$(CRED)Kernel $(VERSION) [Error]$(CRAZ): Check /tmp/test_vz5_debvm_expect.log" >&2 \
		&& echo "$(CGRN)Kernel $(VERSION) [OK]$(CRAZ): console logs in /tmp/test_debvm_expect.log" >&2;

# superuser designed targets

is_root:
	@[ "$(shell whoami)" = "root" ] || {\
		echo "$(CRED)ERROR :$(CRAZ) You need to be root to run this target" >&2;\
		false;\
	};

$(BZIMAGE_TEST): can_upgrade is_root
	cp "$(BZIMAGE)" "$@"

_virsh_test: $(BZIMAGE_TEST) can_upgrade is_root
	@$(VIRSH_TEST_SCRIPT) "$(TEST_VM_HOSTNAME)" "$(VERSION)" "$(TEST_VM_NAME)" || {\
		echo "$(CRED)Kernel $(VERSION) [Error]$(CRAZ): Check /tmp/test_vz5_expect.log" >&2;\
		false;\
	} && echo "$(CGRN)Kernel $(VERSION) [OK]$(CRAZ): console logs in /tmp/test_vz5_expect.log" >&2;



$(BZIMAGE_INSTALL): tested can_upgrade is_root
	-cp -v $(BZIMAGE_INSTALL) $(BZIMAGE_INSTALL).old;
	cp -v $(BZIMAGE) $(BZIMAGE_INSTALL);

install: $(BZIMAGE_INSTALL) archive is_root