CURL	?= $(shell if test -f /usr/bin/curl ; then echo "curl -H Pragma: -O -R -S --fail --show-error" ; fi)
WGET	?= $(shell if test -f /usr/bin/wget ; then echo "wget -nd -m" ; fi)
CLIENT	?= $(if $(CURL),$(CURL),$(if $(WGET),$(WGET)))
AWK	= awk
MD5SUM	= md5sum
SED	= sed

SPECFILE = kernel-2.6.spec

# Thierry - when called from within the build, PWD is /build
PWD=$(shell pwd)

# get nevr from specfile.
ifndef NAME
NAME := $(shell rpm $(RPMDEFS) $(DISTDEFS) -q --qf "%{NAME}\n" --specfile $(SPECFILE) | head -1)
endif
ifndef EPOCH
EPOCH := $(shell rpm $(RPMDEFS) $(DISTDEFS) -q --qf "%{EPOCH}\n" --specfile $(SPECFILE) | head -1 | sed 's/(none)//')
endif
ifeq ($(EPOCH),(none))
override EPOCH := ""
endif
ifndef VERSION
VERSION := $(shell rpm $(RPMDEFS) $(DISTDEFS) -q --qf "%{VERSION}\n" --specfile $(SPECFILE)| head -1)
endif
ifndef RELEASE
RELEASE := $(shell rpm $(RPMDEFS) $(DISTDEFS) -q --qf "%{RELEASE}\n" --specfile $(SPECFILE)| head -1)
endif

define get_sources_md5
$(shell cat sources 2>/dev/null | awk 'gensub("^.*/", "", 1, $$2) == "$@" { print $$1; exit; }')
endef
define get_sources_url
$(shell cat sources 2>/dev/null | awk 'gensub("^.*/", "", 1, $$2) == "$@" { print $$2; exit; }')
endef
SOURCEFILES := $(shell cat sources 2>/dev/null | awk '{ print gensub("^.*/", "", 1, $$2) }')

sources: $(SOURCEFILES) $(TARGETS)

$(SOURCEFILES): #FORCE
	@if [ ! -e "$@" ] ; then echo "$(CLIENT) $(get_sources_url)" ; $(CLIENT) $(get_sources_url) ; fi
	@if [ ! -e "$@" ] ; then echo "Could not download source file: $@ does not exist" ; exit 1 ; fi
	@if test "$$(md5sum $@ | awk '{print $$1}')" != "$(get_sources_md5)" ; then \
	    echo "md5sum of the downloaded $@ does not match the one from 'sources' file" ; \
	    echo "Local copy: $$(md5sum $@)" ; \
	    echo "In sources: $$(grep $@ sources)" ; \
	    exit 1 ; \
	else \
	    ls -l $@ ; \
	fi

download-sources:
	@for i in $(SOURCES); do \
		if [ ! -e "$${i##*/}" ]; then \
			echo "$(CLIENT) $$i"; \
			$(CLIENT) $$i; \
		fi; \
	done

replace-sources:
	rm -f sources
	@$(MAKE) new-sources

new-sources: download-sources
	@for i in $(SOURCES); do \
		echo "$(MD5SUM) $$i >> sources"; \
		$(MD5SUM) $${i##*/} | $(AWK) '{ printf "%s  %s\n", $$1, "'"$$i"'" }' >> sources; \
	done

PREPARCH ?= noarch
RPMDIRDEFS = --define "_sourcedir $(PWD)" --define "_builddir $(PWD)" --define "_srcrpmdir $(PWD)" --define "_rpmdir $(PWD)"
trees: sources
	rpmbuild $(RPMDIRDEFS) $(RPMDEFS) --nodeps -bp --target $(PREPARCH) $(SPECFILE)

srpm: sources
	rpmbuild $(RPMDIRDEFS) $(RPMDEFS) --nodeps -bs $(SPECFILE)

TARGET ?= $(shell uname -m)
rpm: sources
	rpmbuild $(RPMDIRDEFS) $(RPMDEFS) --nodeps --target $(TARGET) -bb $(SPECFILE)

clean:
	rm -f *.rpm