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+#
+# This is the top Makefile for lh-bootstrap
+# It is invoked by running "./make" after editing lh-config
+#
+# Each target, for instance "$(OUTPUT)/tmp/.lh_installed",
+# is a witness file, ie the file is not needed anywhere but is
+# used by make to handle dependencies. Each of these files is
+# being touch-ed at the end of each recipe to update its date,
+# since make relies on dates to handle updates of targets.
+# 
+# * why these "exec" at the beginning at each line?
+# => make spawns a shell for every line in every recipe.
+# The "exec" keyword at the beginning of the recipe lines
+# is just a small optimization: it ensures that the shell
+# doesn't stay around while the recipe line is running,
+# so it saves a little RAM and CPU. On most build machines,
+# this should not be noticeable.
+#
+# * why these "setuidgid $(NORMALUSER)" ?
+# => to drop privileges, from root to a normal user, for recipes
+# that do not need root privileges. The user's name is defined in
+# lh-config.
+#
+# * why do we need to be root?
+# => Because some unavoidable operations in the build process need root privileges:
+#     + correctly handling several different uids for the target.
+#     + manipulating and deleting a loopback device, to create the disk images.
+#
+# * why is skarnet.org often an order-only prerequisite in the sub-Makefiles?
+# => When it's the case, it means the build process, not the target,
+# depends on a skarnet.org tool (for instance s6-touch) built for the
+# BUILD machine. There's no need to rebuild everything if the tool
+# changes, since the HOST image does not depend on its details; we
+# just need to ensure that the tool is there.
+
+
+ifndef LH_MAKE_MARKER
+$(error Please use "./make target" instead of "make target")
+endif
+
+
+NORMALUSER_UID := $(shell id -u $(NORMALUSER))
+NORMALUSER_GID := $(shell id -g $(NORMALUSER))
+
+
+it: all
+
+.PHONY: it all clean distclean qemu-boot qemu-image virtualbox-image vmware-image
+
+
+all: qemu-image
+
+
+
+# clean everything
+distclean:
+	exec rm -rf $(OUTPUT)
+
+# clean everything (same as above), minus the sources that were downloaded over the internet
+clean:
+	ls -1 $(OUTPUT) | grep -vF sources | while read a ; do rm -rf $(OUTPUT)/"$$a" & : ; done ; true
+	
+# same as above, minus the kernel (TODO)
+quickclean:
+	ls -1 $(OUTPUT) | grep -vF sources | while read a ; do rm -rf $(OUTPUT)/"$$a" & : ; done ; true
+	
+# other available targets to clean subsystems:
+# clean-busybox
+# clean-dropbear
+#
+# can be called with: ./make clean-busybox
+#
+# these targets are defined in the corresponding subsystem Makefile
+
+
+# Prepare the output directory. This is at the bottom of the dependency tree.
+
+$(OUTPUT)/tmp/.lh_prepared: lh-config
+	exec mkdir -p -m 0755 -- $(OUTPUT)/tmp $(OUTPUT)/initramfs $(OUTPUT)/rootfs $(OUTPUT)/rwfs $(OUTPUT)/userfs $(OUTPUT)/build-build/bin $(OUTPUT)/build-build/opt $(OUTPUT)/build-build/tmp $(OUTPUT)/build-host/bin $(OUTPUT)/build-host/opt $(OUTPUT)/build-host/tmp $(OUTPUT)/host-host $(OUTPUT)/sources
+	exec chown -R -- $(NORMALUSER_UID):$(NORMALUSER_GID) $(OUTPUT)/tmp $(OUTPUT)/build-build $(OUTPUT)/build-host $(OUTPUT)/host-host
+	exec chown -- $(NORMALUSER_UID):$(NORMALUSER_GID) $(OUTPUT)/sources $(OUTPUT)
+	exec setuidgid $(NORMALUSER) touch $@
+
+
+# This target builds all the build-time native tools, the real part of the build depends on this target
+
+$(OUTPUT)/build-build/.lh_done: $(OUTPUT)/build-build/.lh_gcc $(OUTPUT)/build-build/.lh_skarnet_installed $(OUTPUT)/build-build/.lh_util-linux_installed $(OUTPUT)/build-build/.lh_kmod_installed
+	exec setuidgid $(NORMALUSER) touch $@
+
+
+# The rootfs
+
+$(OUTPUT)/tmp/.lh_rootfs_installed: $(OUTPUT)/tmp/.lh_layout_installed $(OUTPUT)/build-host/.lh_skarnet_installed $(OUTPUT)/build-host/.lh_bb_installed $(OUTPUT)/build-host/.lh_bbsuid_installed $(OUTPUT)/build-host/.lh_dnscache_installed $(OUTPUT)/build-host/.lh_dropbear_installed $(OUTPUT)/tmp/.lh_initramfs_done $(OUTPUT)/build-host/kernel/.lh_installed
+	exec setuidgid $(NORMALUSER) touch $@
+
+
+# Disk images (raw for qemu, vmdk for virtualbox and vmware)
+
+$(OUTPUT)/tmp/.lh_installed: $(OUTPUT)/tmp/.lh_rootfs_installed $(OUTPUT)/tmp/.lh_initramfs_done $(OUTPUT)/build-host/kernel/.lh_installed
+	exec setuidgid $(NORMALUSER) touch $@
+
+$(OUTPUT)/tmp/.lh_diskimage_done: $(OUTPUT)/tmp/.lh_installed $(OUTPUT)/build-build/.lh_done
+
+ifeq ($(KERNEL_GENERIC_ARCH),x86)
+include sub/syslinux/Makefile
+$(OUTPUT)/tmp/.lh_diskimage_done: $(OUTPUT)/build-build/.lh_$(SYSLINUX_NAME)_installed
+endif
+
+$(OUTPUT)/tmp/.lh_diskimage_done:
+	exec sub/disk-image/make-disk-image $(OUTPUT) $(ROOTFS_SIZE) $(SWAP_SIZE) $(RWFS_SIZE) $(USERFS_SIZE) $(EXTRA_SIZE)
+	exec setuidgid $(NORMALUSER) touch $@
+
+qemu-image: $(OUTPUT)/tmp/.lh_diskimage_done
+
+$(OUTPUT)/disk-image.vmdk: $(OUTPUT)/tmp/.lh_diskimage_done
+	exec setuidgid $(NORMALUSER) qemu-img convert -f raw -O vmdk $(OUTPUT)/disk-image.raw $(OUTPUT)/disk-image.vmdk
+
+virtualbox-image: $(OUTPUT)/disk-image.vmdk
+
+vmware-image: $(OUTPUT)/disk-image.vmdk
+
+qemu-boot: $(OUTPUT)/tmp/.lh_diskimage_done
+	./qemu-boot $(OUTPUT)
+
+
+
+# Subsystems
+
+## libc, toolchains, utilities, for the build itself, or for building the host
+
+include sub/kernel/Makefile
+include sub/musl/Makefile
+include sub/util-linux/Makefile
+include sub/xz/Makefile
+include sub/kmod/Makefile
+
+
+## rootfs contents, what's necessary to get an image to boot and connect to it via ssh
+
+include sub/layout/Makefile
+include sub/initramfs/Makefile
+include sub/bearssl/Makefile
+include sub/skarnet.org/Makefile
+include sub/busybox/Makefile
+include sub/dnscache/Makefile
+include sub/dropbear/Makefile