diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 38 |
1 files changed, 12 insertions, 26 deletions
@@ -7,31 +7,6 @@ # used by make to handle dependencies. Each of these files is # being touched 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 @@ -45,7 +20,7 @@ NORMALUSER_GID := $(shell id -g $(NORMALUSER)) it: all -.PHONY: it all rootfs kernel clean distclean +.PHONY: it all rootfs kernel qemu-boot clean distclean all: $(OUTPUT)/tmp/.lh_rootfs_installed $(OUTPUT)/build-host/kernel/.lh_installed @@ -83,6 +58,17 @@ $(OUTPUT)/tmp/.lh_rootfs_installed: $(OUTPUT)/tmp/.lh_layout_installed $(OUTPUT) exec setuidgid $(NORMALUSER) touch $@ +# The qemu disk image (requires qemu and libguestfs-tools) + +$(OUTPUT)/tmp/.lh_diskimage_done: $(OUTPUT)/tmp/.lh_rootfs_installed + exec setuidgid $(NORMALUSER) qemu-img create -f qcow2 $(OUTPUT)/disk-image.qcow2 1G + exec virt-make-fs --format=qcow2 --size=2G --type=ext4 $(OUTPUT)/rootfs $(OUTPUT)/disk-image.qcow2 + exec setuidgid $(NORMALUSER) touch $@ + +qemu-boot: $(OUTPUT)/build-host/kernel/.lh_installed $(OUTPUT)/tmp/.lh_diskimage_done run-qemu + exec ./run-qemu + + # Subsystems ## libc, toolchains, utilities, for the build itself, or for building the host |