#!/usr/bin/make -f

NAME := $(shell awk '$$1 == "Name:" { print $$2; }' META)
VERSION := $(shell dpkg-parsechangelog \
  | awk '$$1 == "Version:" { print $$2; }' | cut -d- -f1)

DKMSFILES := module include config spl.release.in autogen.sh \
		META AUTHORS DISCLAIMER

ifndef DEB_HOST_ARCH
DEB_HOST_ARCH = $(shell dpkg-architecture -qDEB_HOST_ARCH)
endif

ifndef KVERS
KVERS=$(shell uname -r)
endif

non_epoch_version=$(shell echo $(KVERS) | perl -pe 's/^\d+://')
PACKAGE=spl
pmodules = $(PACKAGE)-modules-$(non_epoch_version)

%:
	dh $@ --with dkms

override_dh_auto_configure:
	@cp debian/control.in debian/control

	@# Embed the downstream version in the module.
	@sed -e 's/^Version:.*/Version:      $(VERSION)/' -i.orig META

	@# Create the makefiles and configure script.
	./autogen.sh

	@# Build the userland, but don't build the kernel modules.
	./configure --prefix=/usr --with-config=user \
		--disable-debug-kmem

override_dh_auto_test:
	# scripts/check.sh tries insmod and rmmod, so it cannot
	# run in an unprivileged build environment.

override_dh_auto_install:
	@# Install the utilities.
	$(MAKE) install DESTDIR='$(CURDIR)/debian/tmp'

	@# Get a bare copy of the source code.
	@# This creates the $(CURDIR)/$(NAME)-$(VERSION)/ tree.
	$(MAKE) distdir

	# Install the DKMS source.
	@# We only want the files needed to build the modules
	mkdir -p '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)'
	$(foreach file,$(DKMSFILES),mv '$(CURDIR)/$(NAME)-$(VERSION)/$(file)' '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)' || exit 1;)
	@# Hellish awk line:
	@#  * Deletes from configure.ac the parts not needed for building the kernel module
	@#     * It deletes from inside AC_CONFIG_FILES([]) everything except:
	@#        (Makefile$|include/|module/|*.release$)
	@#  * Takes care of spaces and tabs
	awk '/^AC_CONFIG_FILES\(\[/,/^\]\)/ { if ($$0 !~ /^(AC_CONFIG_FILES\(\[([ \t]+)?$$|\]\)([ \t]+)?$$|([ \t]+)?(include\/|module\/|Makefile([ \t]+)?$$|spl\.release([ \t]+)?$$))/){next} } {print}' \
		'$(CURDIR)/$(NAME)-$(VERSION)/configure.ac' > '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)/configure.ac'
	@# Set "SUBDIRS = module include" for CONFIG_KERNEL and remove SUBDIRS for all other configs.
	sed '1,/CONFIG_KERNEL/s/SUBDIRS.*=.*//g;s/SUBDIRS.*=.*/SUBDIRS = module include/g;' \
		'$(CURDIR)/$(NAME)-$(VERSION)/Makefile.am' > '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)/Makefile.am'
	@# Sanity test
	grep -q 'SUBDIRS = module include' '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)/Makefile.am'
	@# Run autogen on the stripped source tree
	cd '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)'; ./autogen.sh
	rm -fr '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)/autom4te.cache'

	@# This shunt allows DKMS to install the Module.symvers and spl_config.h
	@# files to the ${dkms_tree} area through the POST_INSTALL directive.
	echo '#!/bin/sh'  >'$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)/cp'
	echo 'cp "$$@"'  >>'$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)/cp'
	chmod 755 '$(CURDIR)/debian/tmp/usr/src/$(NAME)-$(VERSION)/cp'

override_dh_dkms:
	dh_dkms -V $(VERSION)

override_dh_auto_clean:
	dh_auto_clean
	@if test -e META.orig; then mv META.orig META; fi
	cp debian/control.in debian/control

# ------------

override_dh_prep-deb-files:
	for templ in $(wildcard $(CURDIR)/debian/*_KVERS_*.in); do \
		sed -e 's/##KVERS##/$(KVERS)/g ; s/#KVERS#/$(KVERS)/g ; s/_KVERS_/$(KVERS)/g ; s/##KDREV##/$(KDREV)/g ; s/#KDREV#/$(KDREV)/g ; s/_KDREV_/$(KDREV)/g ;  s/_ARCH_/$(DEB_HOST_ARCH)/g' \
		< $$templ > `echo $$templ | sed -e 's/_KVERS_/$(KVERS)/g ; s/_ARCH_/$(DEB_HOST_ARCH)/g ; s/\.in$$//'` ; \
	done
	sed -e 's/##KVERS##/$(KVERS)/g ; s/#KVERS#/$(KVERS)/g ; s/_KVERS_/$(KVERS)/g ; s/##KDREV##/$(KDREV)/g ; s/#KDREV#/$(KDREV)/g ; s/_KDREV_/$(KDREV)/g ; s/_ARCH_/$(DEB_HOST_ARCH)/g' \
	< debian/control.modules.in > debian/control

override_dh_configure_modules: override_dh_configure_modules_stamp
override_dh_configure_modules_stamp:
	./configure --with-config=kernel --with-linux=$(KSRC) \
		--with-linux-obj=$(KOBJ) \
		--disable-debug-kmem
	touch override_dh_configure_modules_stamp

override_dh_binary-modules-udeb: override_dh_prep-deb-files override_dh_configure_modules
	dh_testdir
	dh_testroot
	dh_prep

	$(MAKE) -C $(CURDIR)/module modules

	dh_installdirs -p${pmodules}-di
	dh_install -p${pmodules}-di
	dh_gencontrol -p${pmodules}-di

	dh_builddeb -p${pmodules}-di

override_dh_binary-modules: override_dh_prep-deb-files override_dh_configure_modules
	dh_testdir
	dh_testroot
	dh_prep

	$(MAKE) -C $(CURDIR)/module modules

	dh_installdocs -p${pmodules}
	dh_install -p${pmodules}
	dh_installchangelogs -p${pmodules}
	dh_compress -p${pmodules}
	dh_strip -p${pmodules}
	dh_fixperms -p${pmodules}
	dh_installdeb -p${pmodules}
	dh_gencontrol -p${pmodules}
	dh_md5sums -p${pmodules}

	dh_builddeb -p${pmodules}