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KERNEL_VERSION ?= 4.11.2
KERNEL_MAJOR := $(firstword $(subst ., ,$(KERNEL_VERSION)))
KERNEL_ENV := DEPMOD=$(OUTPUT)/build-build/opt/kmod/bin/depmod INSTALL_MOD_PATH=$(OUTPUT)/rootfs CROSS_COMPILE=$(BUILD_HOST_PREFIX)- ARCH=$(KERNEL_GENERIC_ARCH) INSTALL_MOD_STRIP="-R .note -R .comment -R .note.GNU-stack --strip-debug"
# for Stage 1 - get the kernel headers for the build-build
# these headers are not correct but we don't care
$(OUTPUT)/sources/linux-$(KERNEL_VERSION).tar.xz: | $(OUTPUT)/tmp/.lh_prepared
cd $(OUTPUT)/sources && setuidgid $(NORMALUSER) wget https://cdn.kernel.org/pub/linux/kernel/v$(KERNEL_MAJOR).x/linux-$(KERNEL_VERSION).tar.xz
$(OUTPUT)/build-build/.lh_kernel_unpacked: $(OUTPUT)/sources/linux-$(KERNEL_VERSION).tar.xz
exec setuidgid $(NORMALUSER) mkdir -p $(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION)
exec setuidgid $(NORMALUSER) makenamelink $(OUTPUT)/build-build/opt linux linux-$(KERNEL_VERSION) $(OUTPUT)/tmp
exec setuidgid $(NORMALUSER) rm -rf $(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION)/src $(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION)/linux-$(KERNEL_VERSION)
cd $(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION) && setuidgid $(NORMALUSER) tar Jxpvf $(OUTPUT)/sources/linux-$(KERNEL_VERSION).tar.xz
exec setuidgid $(NORMALUSER) mv -f $(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION)/linux-$(KERNEL_VERSION) $(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION)/src
exec setuidgid $(NORMALUSER) touch $@
$(OUTPUT)/build-build/.lh_kernel_headers_installed: $(OUTPUT)/build-build/.lh_kernel_unpacked
cd $(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION)/src && setuidgid $(NORMALUSER) $(MAKE) headers_install INSTALL_HDR_PATH=$(OUTPUT)/build-build/opt/linux-$(KERNEL_VERSION)
exec setuidgid $(NORMALUSER) touch $@
# for Stage 2 - build the kernel
$(OUTPUT)/build-host/kernel/.lh_unpacked: $(OUTPUT)/sources/linux-$(KERNEL_VERSION).tar.xz | $(OUTPUT)/build-build/.lh_skarnet_installed
exec setuidgid $(NORMALUSER) s6-mkdir -p $(OUTPUT)/build-host/kernel
exec setuidgid $(NORMALUSER) cd $(OUTPUT)/build-host/kernel tar Jxpvf $(OUTPUT)/sources/linux-$(KERNEL_VERSION).tar.xz
exec setuidgid $(NORMALUSER) s6-touch $@
$(OUTPUT)/build-host/kernel/.lh_configured: $(OUTPUT)/build-host/kernel/.lh_unpacked sub/kernel/wireless-db.txt $(KERNEL_CONFIG) | $(OUTPUT)/build-build/.lh_skarnet_installed
exec setuidgid $(NORMALUSER) cp -f sub/kernel/wireless-db.txt $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION)/net/wireless/db.txt
exec setuidgid $(NORMALUSER) cp -f $(KERNEL_CONFIG) $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION)/.config
exec setuidgid $(NORMALUSER) cd $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION) $(MAKE) olddefconfig $(KERNEL_ENV)
exec setuidgid $(NORMALUSER) s6-touch $@
$(OUTPUT)/build-host/kernel/.lh_prepared: | $(OUTPUT)/tmp/.lh_prepared $(OUTPUT)/build-build/.lh_skarnet_installed
exec s6-mkdir -p $(OUTPUT)/rootfs/opt/linux-kernel-headers-$(KERNEL_VERSION)
exec makenamelink $(OUTPUT)/rootfs/opt linux-kernel-headers linux-kernel-headers-$(KERNEL_VERSION) $(OUTPUT)/tmp
exec setuidgid $(NORMALUSER) s6-mkdir -p $(OUTPUT)/build-host/kernel
exec setuidgid $(NORMALUSER) s6-touch $@
$(OUTPUT)/build-host/kernel/.lh_headers_installed: $(OUTPUT)/build-host/kernel/.lh_prepared $(OUTPUT)/build-host/kernel/.lh_built | $(OUTPUT)/build-build/.lh_skarnet_installed
exec cd $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION) $(MAKE) headers_install $(KERNEL_ENV) INSTALL_HDR_PATH=$(OUTPUT)/rootfs/opt/linux-kernel-headers-$(KERNEL_VERSION)
exec setuidgid $(NORMALUSER) s6-touch $@
$(OUTPUT)/build-host/kernel/.lh_built: $(OUTPUT)/build-host/kernel/.lh_configured | $(OUTPUT)/build-build/.lh_kmod_installed $(OUTPUT)/build-build/.lh_skarnet_installed
exec setuidgid $(NORMALUSER) cd $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION) $(MAKE) modules_prepare $(KERNEL_ENV)
exec setuidgid $(NORMALUSER) cd $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION) $(MAKE) all $(KERNEL_ENV)
exec setuidgid $(NORMALUSER) s6-touch $@
$(OUTPUT)/build-host/kernel/.lh_installed: $(OUTPUT)/build-host/kernel/.lh_built | $(OUTPUT)/build-build/.lh_kmod_installed $(OUTPUT)/build-build/.lh_skarnet_installed
exec cd $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION) $(MAKE) modules_install $(KERNEL_ENV)
exec s6-rmrf $(OUTPUT)/rootfs/lib/modules/$(KERNEL_VERSION)/build $(OUTPUT)/rootfs/lib/modules/$(KERNEL_VERSION)/source
exec cp -f $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION)/System.map $(OUTPUT)/rootfs/boot/System.map-$(KERNEL_VERSION)
exec s6-ln -sf System.map-$(KERNEL_VERSION) $(OUTPUT)/rootfs/boot/System.map
cp -f $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION)/arch/$(KERNEL_GENERIC_ARCH)/boot/bzImage $(OUTPUT)/kernel || cp -f $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION)/arch/$(KERNEL_GENERIC_ARCH)/boot/zImage $(OUTPUT)/kernel || cp -f $(OUTPUT)/build-host/kernel/linux-$(KERNEL_VERSION)/arch/$(KERNEL_GENERIC_ARCH)/boot/Image $(OUTPUT)/kernel
ifeq ($(KERNEL_GENERIC_ARCH),x86)
exec cp -f $(OUTPUT)/kernel $(OUTPUT)/rootfs/boot/vmlinuz-$(KERNEL_VERSION)
exec s6-ln -sf vmlinuz-$(KERNEL_VERSION) $(OUTPUT)/rootfs/boot/vmlinuz
endif
exec setuidgid $(NORMALUSER) s6-touch $@
# TODO: copy the config to /boot
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