# Mercurial
HG ?= hg

LINUX_SRCDIR ?= linux-$(LINUX_VER)-xen.hg

# Repository to clone.
XEN_LINUX_HGREPO ?= $$(sh buildconfigs/select-repository $(LINUX_SRCDIR) $(LINUX_SRC_PATH))

# The source directory is not automatically updated to avoid blowing
# away developer's changes. If you want to automatically pull a new
# version of the Linux tree then add `XEN_LINUX_UPDATE=y' to your make
# command line.
ifeq ($(XEN_LINUX_UPDATE),y)
__XEN_LINUX_UPDATE = $(LINUX_SRCDIR)/.force-update
else
__XEN_LINUX_UPDATE =
endif

# Set XEN_LINUX_HGREV to update to a particlar revision.
XEN_LINUX_HGREV  ?= tip

$(LINUX_SRCDIR)/.valid-src: $(__XEN_LINUX_UPDATE)
	set -e ; __repo=$(XEN_LINUX_HGREPO) ; \
	if [ ! -d $(LINUX_SRCDIR) ] ; then \
	    echo "Cloning $${__repo} to $(LINUX_SRCDIR)." ; \
	    $(HG) clone $${__repo} $(LINUX_SRCDIR) ; \
	else \
	    echo "Pulling changes from $${__repo} into $(LINUX_SRCDIR)." ; \
	    $(HG) -R $(LINUX_SRCDIR) pull $${__repo} ; \
	fi
	if [ -n "$(XEN_LINUX_HGREV)" ] ; then \
	    echo "Updating $(LINUX_SRCDIR) to revision $(XEN_LINUX_HGREV)." ; \
	    $(HG) update -R $(LINUX_SRCDIR) $(XEN_LINUX_HGREV) ; \
	fi
	touch $@

.PHONY: $(LINUX_SRCDIR)/.force-update
$(LINUX_SRCDIR)/.force-update:
	@ :