#!/usr/bin/make -f

# Uncomment this to turn on verbose mode.
#export DH_VERBOSE=1

# Activate full hardening build flags
export DEB_BUILD_MAINT_OPTIONS := hardening=+all

include /usr/share/dpkg/default.mk

##############################################################################

TESTSUITE_ENV = SKIP_KNOWN_BUGS=y VERBOSE=y
# always run tests in UTF8 mode to verify unicode support
TESTSUITE_ENV += LANG=C.UTF-8 LC_ALL=C.UTF-8
TESTSUITE_ENV += SKIP_INTERNET_TESTS=y
# Required for testsuite/taskset.tests
TESTSUITE_ENV += SHELL='sh -e'

# build directory
b = debian/build

# which flavours to build
flavours = deb static udeb

ifneq (${DEB_HOST_GNU_TYPE},${DEB_BUILD_GNU_TYPE})
export CROSS_COMPILE = ${DEB_HOST_GNU_TYPE}-
endif

# We filter the following from CFLAGS:
# -Werror=format-security
#   because busybox uses constructs like
#    bb_error_msg_and_die(bb_msg_memory_exhausted);
#   in several places, and gcc complains because bb_msg_memory_exhausted is an
#   extern.
#
# -O2
#   to use the optimization setting from busybox's configuration and build
#   system, causing it to use -Os. This reduces built binaries' size
#   considerably, making it easier to fit on space constrained systems.
CFLAGS := $(filter-out -Werror=format-security -O2, ${CFLAGS})

# Avoid Kconfig outputting the timestamp into generated configuration files. We
# use this to compare against the configuration files in debian/config/pkg for
# builds on Linux so that we can detect upstream configuration changes (e.g.
# added applets).
export KCONFIG_NOTIMESTAMP=1

%:
	dh $@

##############################################################################

override_dh_auto_configure: $(patsubst %,${b}/%/.stamp-setup, ${flavours})

${b}/%/.stamp-setup: DIR = ${b}/$*
${b}/%/.stamp-setup:
	rm -rf ${DIR}
	mkdir -p ${DIR}
	cp -a -l $(filter-out debian ${b}, $(wildcard *)) ${DIR}

# Generate the .config file. First variable assignment wins.
# Several steps..

# 1, rm it just in case
	rm -f ${DIR}/.config

# 2, put any arch-specific overrides so they will have higher precedence
# should be empty for linux
	cat debian/config/os/${DEB_HOST_ARCH_OS} > ${DIR}/.config

# 3, on non-linux platform, disable all config symbols
# which select PLATFORM_LINUX.
# Configuration information is stored in source files and in Config.src,
# so we have to generate Config.in files first, -- done by gen_build_files.
	${MAKE} -C ${DIR} gen_build_files \
	  SKIP_STRIP=y \
	  BB_EXTRA_VERSION="${DEB_VENDOR} ${DEB_VERSION}" \
	  CONFIG_EXTRA_CFLAGS='${CFLAGS} ${CPPFLAGS}' \
	  CONFIG_EXTRA_LDFLAGS='${CFLAGS} ${LDFLAGS}' \
	  V=1
ifneq (linux,${DEB_HOST_ARCH_OS})
	find ${DIR} -name Config.in -exec \
	  awk '$$1 == "config" { conf = $$2 } \
	       $$1 == "select" && $$2 == "PLATFORM_LINUX" \
	       { print "CONFIG_" conf "=n"; }' \
	   {} + \
        | sort -u >> ${DIR}/.config
endif

# 4, use the flavour-specific base config file.
	cat debian/config/pkg/$* >> ${DIR}/.config

# 5, sort out the resulting mess using oldconfig Kbuild machinery
	yes "" | ${MAKE} -C ${DIR} oldconfig V=1

# 6, on linux platform only, compare the re-generated config to the shipped
# config in the package in order to catch new/changed upstream options.
ifeq (linux,${DEB_HOST_ARCH_OS})
	cmp debian/config/pkg/$* ${DIR}/.config
endif

	ln -s .config $@

##############################################################################

override_dh_auto_build: $(patsubst %,${b}/%/.stamp-build, ${flavours})

${b}/%/.stamp-build: DIR = ${b}/$*
${b}/%/.stamp-build:
	dh_auto_build -- -C ${DIR} all \
	  SKIP_STRIP=y \
	  BB_EXTRA_VERSION="${DEB_VENDOR} ${DEB_VERSION}" \
	  CONFIG_EXTRA_CFLAGS='${CFLAGS} ${CPPFLAGS}' \
	  CONFIG_EXTRA_LDFLAGS='${CFLAGS} ${LDFLAGS}' \
	  V=1

	ln -sf busybox $@

##############################################################################

ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
# we run testsuite only for main flavour
test-dep := ${b}/deb/.stamp-test
else
test-dep :=
endif

override_dh_auto_test: ${test-dep}

${b}/%/.stamp-test: DIR = ${b}/$*
${b}/%/.stamp-test:
	@echo ======== running testsuite in ${DIR} ========
# mdev testsuite requires chroot which does not work as non-root user
	rm -f ${DIR}/testsuite/mdev.tests
# disable or fix some failing tests
	if [ -f debian/testsuite-${DEB_HOST_ARCH_OS}.diff ] && \
	   ! [ -f ${DIR}/.tests-fixed ]; then \
		( cd ${DIR} && patch -p1 && touch .tests-fixed; ) \
		  < debian/testsuite-${DEB_HOST_ARCH_OS}.diff ; \
	fi
	cd ${DIR}/testsuite && ${TESTSUITE_ENV} ./runtest -v
	touch $@

##############################################################################

override_dh_auto_clean:
	dh_auto_clean
	rm -rf ${b}

##############################################################################

override_dh_auto_install: $(patsubst %,${b}/%/.stamp-install, ${flavours})

${b}/%/.stamp-install: DIR = ${b}/$*
${b}/%/.stamp-install:
	$(MAKE) -C ${DIR} install \
	  SKIP_STRIP=y \
	  BB_EXTRA_VERSION="${DEB_VENDOR} ${DEB_VERSION}" \
	  CONFIG_EXTRA_CFLAGS='${CFLAGS} ${CPPFLAGS}' \
	  CONFIG_EXTRA_LDFLAGS='${CFLAGS} ${LDFLAGS}' \
	  V=1
	touch $@

##############################################################################

override_dh_installman:
	dh_installman -pbusybox ${b}/deb/docs/busybox.1
	dh_installman -pbusybox-static ${b}/static/docs/busybox.1

override_dh_install:
	rm -f ${b}/udeb/_install/sbin/init

	dh_install
	dh_install -pbusybox ${b}/deb/busybox /bin
	dh_install -pbusybox debian/tree/busybox/* /
	dh_install -pbusybox-static ${b}/static/busybox /bin
	dh_install -pbusybox-udeb ${b}/udeb/_install/* /

override_dh_installdocs:
	dh_installdocs
	dh_installdocs -pbusybox docs/syslog.conf.txt docs/mdev.txt
	dh_installdocs -pbusybox-static docs/syslog.conf.txt docs/mdev.txt

override_dh_installexamples:
	dh_installexamples -pbusybox-static examples/mdev* examples/udhcp

override_dh_installinit:
	dh_installinit -pbusybox-syslogd
	dh_installinit -pbusybox-syslogd --name=busybox-klogd

ifeq (linux,$(DEB_HOST_ARCH_OS))
# udhcpc
# udhcpd
	dh_installinit -pudhcpd --onlyscripts
endif

override_dh_gencontrol:
# after shlibdeps finished, grab ${shlibs:Depends} from busybox package
# and transform it into Built-Using field (also dpkg-query bug #588505)
	if [ -f debian/busybox.substvars ]; then \
	  pkgs=$$(sed -n -e's/([^)]*)//g' -e's/,//g' -e's/^shlibs:Depends=//p' debian/busybox.substvars); \
	  srcs=; for p in $$pkgs; do \
	    srcs="$$srcs $$(dpkg-query -f '$${source:Package} (= $${source:Version}),' -W $$p)"; \
	  done ; \
	  echo "built-using=$$srcs" >> debian/busybox-static.substvars ; \
	fi
	dh_gencontrol