XEN_LINUX_MIRROR ?= http://www.kernel.org/pub/linux/kernel/v2.6/
XEN_LINUX_TARBALL ?= linux-$(LINUX_VER)-xen.tar.bz2

# Update using ketchup instead of manipulating tarball manually.
XEN_LINUX_TARBALL_KETCHUP ?= n

LINUX_SRCDIR ?= linux-$(LINUX_VER)

KETCHUP ?= python buildconfigs/ketchup

vpath linux-%.tar.bz2 $(LINUX_SRC_PATH)

# download a pristine Linux kernel tarball if there isn't one in LINUX_SRC_PATH
linux-%.tar.bz2:
	@echo "Cannot find $@ in path $(LINUX_SRC_PATH)"
	wget $(XEN_LINUX_MIRROR)/$@ -O./$@

# XXX create a pristine tree for diff -Nurp convenience

ifeq ($(XEN_LINUX_TARBALL_KETCHUP),y)
%/.valid-src: $(__XEN_LINUX_UPDATE)
	$(KETCHUP) -d $(@D) $(LINUX_VER)
	touch $@ # update timestamp to avoid rebuild
else
%/.valid-src: $(__XEN_LINUX_UPDATE) %.tar.bz2
	rm -rf tmp-linux-$* $(@D)
	mkdir -p tmp-linux-$*
	tar -C tmp-linux-$* -jxf $<
	-@rm -f tmp-linux-$*/pax_global_header
	mv tmp-linux-$*/* $(@D)
	@rm -rf tmp-linux-$*
	touch $@ # update timestamp to avoid rebuild
endif