#
# This Makefile executes the unpack/build/binary targets for a single
# subarch, which is passed in the subarch variable. Empty subarch
# variable means that we are building for an arch without the subarch.
# Additionally, variables version, abiname and ktver are
# expected to be available (need to be exported from the parent process).
# It is possible to override the flavours by setting the flavours
# variable.
#
SHELL  := sh -e
debver := $(version)-$(abiname)
uver   := $(subst .,_,$(version))
debnum := -$(abiname)
bpkg   := kernel-build-$(debver)
kbpkg  := kernel-kbuild-$(version)-$(abiname)
kpatch := /usr/src/kernel-patches/all/$(version)/apply/debian $(version)-$(ktver)
DEBIAN_UPSTREAM_VERSION := $(version)
ifeq (,$(DEB_HOST_ARCH))
  DEB_HOST_ARCH  := $(shell dpkg-architecture -qDEB_HOST_ARCH)
  DEB_BUILD_ARCH := $(shell dpkg-architecture -qDEB_BUILD_ARCH)
endif
export version debnum DEBIAN_UPSTREAM_VERSION

karch    := $(DEB_HOST_ARCH)
ifeq ($(subarch),none)
  basedir := arch/$(karch)
else
  basedir := arch/$(karch)/$(subarch)
endif
default  := $(basedir)/config.default
configs  := $(notdir $(wildcard $(basedir)/config.*))
configs  := $(filter-out config.common config.default, $(configs))
tkdir    := kernel-source-$(version)
kdir     := kernel-source-$(version)-$(subarch)
ifndef flavours
  flavours := $(patsubst config.%,%,$(configs))
endif
build_prefix := build-$(subarch)-
 
-include $(basedir)/Makefile.inc
#
# Here we construct the command lines for different make-kpkg
# calls (build, kernel-image, kernel-headers) based on the values
# of variables defined so far and provided by the arch/subarch
# in Makefile.inc. Note that $$i in these expressions is going to
# become a reference to the shell variable $i, which is expected
# to have the current flavour. This is slightly evil, but saves
# a lot of grief.
#
kpkg_headers_cmd := HEADER_CLEAN_HOOK='$(CURDIR)/header-install-$(subarch)'
kpkg_headers_cmd += make-kpkg --append-to-version $(debnum)
kpkg_build_cmd  := make-kpkg --append-to-version $(debnum)-$$i
ifdef added_patches
  kpkg_headers_cmd += --added_patches $(subst @uver@,$(uver),$(added_patches))
  kpkg_build_cmd   += --added_patches $(subst @uver@,$(uver),$(added_patches))
endif
ifdef build_subarch
  kpkg_build_cmd += --subarch $$i
endif
ifdef headers_subarch
  kpkg_headers_cmd += --subarch $(headers_subarch)
endif
ifdef build_makeflags
  kpkg_build_cmd := MAKEFLAGS=$(build_makeflags) $(kpkg_build_cmd)
endif
kpkg_image_cmd  := $(kpkg_build_cmd) --initrd kernel_image
kpkg_build_cmd  += build
kpkg_headers_cmd += kernel-headers
ifndef headers_dirs
  headers_dirs = $(karch)
endif

#
# TODO:
#  * Check that make oldconfig does not actually
#    change the config file. If it does, something
#    is wrong (missing/extra options, etc).
#
unpack: unpack-stamp-$(subarch)
unpack-stamp-$(subarch): $(kdir) $(configs) header-install-$(subarch)
	for i in $(flavours); do			\
	  cp -al $(kdir) build-$(subarch)-$$i;	\
	  cp config.$$i build-$(subarch)-$$i/.config;	\
	done
#	Need to clean out configs so that there is no filename
#       clash with other subarches.
	rm -f $(configs)
	touch unpack-stamp-$(subarch)
#
# TODO:
#   * Implement optional stripping of the kernel
#     (for sparc). 
#   * Check that it is really ok to call --subarch
#     with the name of the flavour. For mips which
#     is another --subarch user it should be fine.
#
build: build-stamp-$(subarch)
build-stamp-$(subarch): unpack-stamp-$(subarch)
	dh_testdir
	PATH=$$PWD/bin:$$PATH;		\
	for i in $(flavours); do	\
	  cd build-$(subarch)-$$i;	\
	  $(kpkg_build_cmd);		\
	  cd ..;			\
	done
	touch build-stamp-$(subarch)

binary-indep: build
binary-arch: build
	dh_testdir
	dh_clean -k
	dh_installdirs

	cd $(kdir); $(kpkg_headers_cmd)
#
#	Hmm, is it right to just cat all the debian/files
#	together? Need to check it out...
#
	cat $(kdir)/debian/files >> debian/files

	for i in $(flavours); do			\
	  cp -al build-$(subarch)-$$i install-$$i;	\
	  cd install-$$i;				\
	  $(kpkg_image_cmd);				\
	  cd ..;					\
	  cat install-$$i/debian/files >> debian/files;	\
	  rm -rf install-$$i ;				\
	done
	mv *.deb ..

binary:	binary-indep binary-arch

header-install-$(subarch): header-install.in
	sed -e 's,@kbpkg@,$(kbpkg),g'				\
	    -e 's,@ksource_dir@,$(CURDIR)/$(kdir),g'		\
	    -e 's,@headers_dirs@,$(headers_dirs),g'		\
	    -e 's,@headers_extra@,$(headers_extra),g'		\
            header-install.in > header-install-$(subarch)
	chmod u+x header-install-$(subarch)

post-install: post-install.in
	sed -e 's,@initrd_modules@,$(initrd_modules),'	\
	    post-install.in > post-install
#
# Generates the kernel config file for a subarch by merging
# the arch-independent config file (arch/config.common),
# arch-specific config file (arch/$(karch)/config.common),
# and subarch specific one (arch/$(karch)/config.subarch).
# It is possible to avoid the inclusion of the arch-indep
# config file by setting include_common_config = no in the
# arch/$(karch)/Makefile.inc. Absense of any of the above
# files is ignored.
#
config.%:
	@echo -n "Generating configuration file $@ ..."
	arch='$(basedir)/config.common';		\
	subarch='$(basedir)/$@';			\
	include='';					\
	if [ '$(include_common_config)' != 'no' ]; then	\
	  include='arch/config.common';                 \
	fi;                                             \
	if [ -f "$${arch}" ]; then                      \
	  include="$${include} $${arch}";               \
	fi;                                             \
	if [ -f "$${subarch}" ]; then                   \
	  include="$${include} $${subarch}";            \
	fi;                                             \
	cat $${include} > $@ 
	@echo " done."
#
# TODO: subarch specific patches
#
$(kdir): post-install
	dh_testdir
	tar jxf /usr/src/$(tkdir).tar.bz2
	mkdir -p $(tkdir)/debian
	cp debian/changelog $(tkdir)/debian
	cp debian/control   $(tkdir)/debian
	cp debian/copyright $(tkdir)/debian
	cp $(default) $(tkdir)/.config
	touch $(tkdir)/debian/official
	install post-install $(tkdir)/debian
	cd $(tkdir) && $(kpatch)
#	Here we need to do the subarch-specific patching
	mv $(tkdir) $@

.PHONY: build unpack binary-indep binary-arch binary