#
# 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 ltver 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. It will also be passed a list of source files
#
# This Makefile is run from the debian subdir. 
#
SHELL  := sh -e
debver := $(version)-$(abiname)
debnum := -$(abiname)
#
# These variables control the behaviour of make-kpkg
#
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 DEBIAN_STEM

karch := $(DEB_HOST_ARCH)
#
# Build the list of common config files to be included
#
ifeq ($(subarch),none)
  basedir := arch/$(karch)
  append  := 
else
  basedir := arch/$(karch)/$(subarch)
  append  := $(subarch)-
endif

configs := $(notdir $(wildcard $(basedir)/config.*))
configs := $(filter-out config.common config.default, $(configs))
tkdir   := linux-source-$(version)
kdir    := linux-source-$(version)-$(subarch)
ifndef flavours
  flavours := $(patsubst config.%,%,$(configs))
endif
controls := templates/control.source.in templates/control.headers.in
controls += $(basedir)/control.in

-include $(basedir)/Makefile.inc

#
# Here we construct the command lines for different make-kpkg
# calls (build, linux-image, linux-headers) based on the values
# of variables defined so far and provided by the arch/subarch
# in Makefile.inc. @flavour@ in the expressions is going to be
# replaced by the flavour for which the command is run. 
#
kpkg_headers_cmd := HEADER_CLEAN_HOOK='$(CURDIR)/header-install-$(subarch)'
kpkg_headers_cmd += make-kpkg --append-to-version $(append)$(debnum)
kpkg_headers_cmd += --stem linux
kpkg_build_cmd := make-kpkg --append-to-version $(debnum)-@flavour@
kpkg_build_cmd += --stem linux
ifdef build_subarch
  kpkg_build_cmd += --subarch $(build_subarch)
endif
ifdef headers_subarch
  kpkg_headers_cmd += --subarch $(headers_subarch)
endif
ifdef build_makeflags
  export_makeflags := export MAKEFLAGS=$(build_makeflags)
else
  export_makeflags := true
endif
#
# Note that next variable (kpkg_image_pre) is not going to be evaluated
# immediately. When referenced, the variable $* will have the current
# flavour for which the command is executed. So if this flavour will
# happen to be in the image_prefix_flavours list, the call to make-kpkg
# will be prepended with contents if image_prefix.
#
kpkg_image_pre = $(if $(filter $*,$(image_prefix_flavours)),$(image_prefix))
kpkg_image_cmd := $(kpkg_build_cmd) --initrd kernel_image
kpkg_build_cmd += build
kpkg_headers_cmd += kernel-headers
ifndef headers_dirs
  headers_dirs = $(karch)
endif
ifneq (no,$(include_common_config))
  ccommon := arch/config.common
endif
ccommon += arch/$(karch)/config.common arch/$(karch)/$(subarch)/config.common
#
# Here we build lists of directories and stamps which we will depend on.
# For each class of such targets there is a pattern rule which will catch
# it and do the right thing.
#
bdirs   := $(addprefix build-$(subarch)-, $(flavours))
bstamps := $(addprefix build-stamp-$(subarch)-, $(flavours))
istamps := $(addprefix install-stamp-$(subarch)-, $(flavours))
#
# We need to determine the default config, the one which we will
# use to build the headers with. It does not matter very much which
# one is used, but for historical reasons we will look for it like
# this:
# * If variable default_config is set (may be set in Makefile.inc)
#   then config file config.$(default_config) will be used as default.
# * If the file config.default exists, it will be used as a default.
# * Otherwise, the config for the first flavour mentioned in $(flavours)
#   will be used.
#
default_list := $(basedir)/config.$(default_config)
default_list += $(basedir)/config.default
default_list += $(basedir)/config.$(firstword $(flavours))
default := $(firstword $(wildcard $(default_list)))

#
# Targets
#
unpack: unpack-stamp-$(subarch)
unpack-stamp-$(subarch): $(configs) header-install-$(subarch) $(bdirs)
	touch unpack-stamp-$(subarch)

build: build-stamp-$(subarch)
build-stamp-$(subarch): unpack-stamp-$(subarch) $(bstamps)
	touch build-stamp-$(subarch)

binary-indep: build
binary-arch: build headers-stamp $(istamps)
	mv *.deb ../..

install-stamp-$(subarch)-%: build-$(subarch)-% build-stamp-$(subarch)-%
	cp -al $< install-$*;
	cd install-$*; 		\
	$(export_makeflags); 	\
	$(strip $(kpkg_image_pre) $(subst @flavour@,$*,$(kpkg_image_cmd)))
	cat install-$*/debian/files >> files;
	rm -rf install-$*;
	touch install-stamp-$(subarch)-$*

headers-stamp: $(kdir)
	@echo "I: Using $(default) as the header configuration file."
	cp $(default) $(kdir)/.config
	cd $(kdir); $(kpkg_headers_cmd)
	cat $(kdir)/debian/files >> files
	touch headers-stamp

binary:	binary-indep binary-arch

header-install-$(subarch): templates/header-install.in
	sed -e 's,@kbpkg@,$(kbpkg),g'				\
	    -e 's,@ksource_dir@,$(CURDIR)/$(kdir),g'		\
	    -e 's,@headers_dirs@,$(headers_dirs),g'		\
	    -e 's,@headers_extra@,$(headers_extra),g'		\
            templates/header-install.in > header-install-$(subarch)
	chmod u+x header-install-$(subarch)
#
# The way to make the correct package names is to make a
# subarch-specific post-install script...
#
post-install-$(subarch): templates/post-install.in
	sed -e 's,@initrd_modules@,$(initrd_modules),'	\
	    -e 's,@append_subarch@,$(append),'		\
	    templates/post-install.in > post-install-$(subarch)
#
# 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/$(karch)/Makefile.inc.
#
config.%:
	@echo "configs=$(configs)"
	@echo "Generating configuration file $@:"
	rm -f $@
	for i in $(ccommon); do	\
	  if [ -f $${i} ]; then	\
	    cat $${i} >> $@;	\
	  fi;			\
	done
#	Flavour config file must be present
	cat $(basedir)/$@ >> $@			 

srcfiles := $(filter-out ../debian ../linux-source-$(version), $(shell echo ../*))
patches  := $(wildcard patches-arch/$(subarch).*)
patches  += $(wildcard patches-arch/$(subarch)_*)
patches  += $(wildcard patches-arch/$(karch).*)
patches  += $(wildcard patches-arch/$(karch)_*)
patches  := $(strip $(patches))
# substitute() and friends is duplicated in debian/rules; this should
# be cleaned up in the long term.  watch out for relative paths, as
# debian/rules runs in the top level directory, while debian/Makefile
# runs from the debian directory!
$(kdir): post-install-$(subarch) $(wildcard templates/control.*.in)
	mkdir -p $(tkdir)
	cp -al $(srcfiles) $(tkdir)
	mkdir -p $(tkdir)/debian
	cp changelog $(tkdir)/debian
	cp copyright $(tkdir)/debian
	substitute() {                                  \
		cat templates/control.$$1 |      \
			sed -e 's/@version@/$(version)/g'       \
				-e 's/@major@/$(major)/g'           \
				-e "s/@arch@/$(karch)/g"                 \
				-e "s/@subarch@/$(append)/g"             \
				-e "s/@flavour@/$$2/g"              \
				-e 's/@ltver@/$(ltver)/g'           \
				-e 's/@srcver@/$(srcver)/g'         \
				-e 's/@lt_depends@/$(lt_depends)/g' \
				-e 's/@lt_provides@/$(lt_provides)/g' \
				-e 's/@abiname@/$(abiname)/g' |     \
			sed '/^[[:space:]]*$$/d' |              \
			sed 's/^Package:/\n&/g';                \
	};                                              \
	substitute source.in "" >> $(tkdir)/debian/control;      \
	substitute headers.in "" >> $(tkdir)/debian/control;     \
	substitute headers.arch.in "" >> $(tkdir)/debian/control; \
	for f in $(flavours); do      \
		substitute headers.flavour.in $$f >> $(tkdir)/debian/control; \
		substitute image.in $$f >> $(tkdir)/debian/control; \
	done
	touch $(tkdir)/debian/official
	if [ -n '$(patches)' ]; then			\
	  cd $(tkdir);					\
	  cat $(addprefix ../,$(patches)) | patch -p1;	\
	fi
	install post-install-$(subarch) $(tkdir)/debian/post-install
	mv $(tkdir) $@
#
# This target performs a build for a particular flavour. Note
# that in this file it should be always placed *before* the
# build-$(subarch)-% target, which creates the build directory.
#
# Some arches have extra arch/${ARCH}/kernel/asm-offsets.s files
# which have to be included in linux-headers. The problem is that
# they are only generated during build and we never performed a
# full build in the directory $(kdir) where linux-headers are
# built. So, after build we check whether current build arch has
# such a file and symlink it into the $(kdir) if necessary. It will
# then be picked up and included into the linux-headers package
# by the headers-install script.
#
build-stamp-$(subarch)-%: build-$(subarch)-%
	PATH=$$PWD/bin:$$PATH;					\
	cd $<;							\
	$(export_makeflags);					\
	$(subst @flavour@,$*,$(kpkg_build_cmd));		\
	$(if $(image_postproc),$(image_postproc),true);		\
	arch=$$(basename $$(readlink include/asm));		\
	arch="$${arch#asm-}";					\
	src="arch/$${arch}/kernel/asm-offsets.s";		\
	dst="../$(kdir)/$${src}";				\
	if [ -f "$${src}" ] && [ ! -e "$${dst}" ]; then		\
	  cp -a "$$(pwd)/$${src}" "$${dst}";			\
	fi
	touch build-stamp-$(subarch)-$*
#
# Creates a build directory for a particular flavour
#
build-$(subarch)-%: $(kdir) config.%
	if [ ! -d $@ ]; then					\
	  cp -al $(kdir) $@;					\
	  cp config.$* $@/.config;				\
	fi

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