#!/usr/bin/make -f

# enable verbose build messages
export DH_VERBOSE=1

# enable all build hardening flags
export DEB_BUILD_MAINT_OPTIONS=hardening=+all

# indicate that binary targets do not require root
export DEB_RULES_REQUIRES_ROOT=no

# compile with clang (gcc is currently not supported)
export AR=ar
export NM=nm
export CC=clang
export CXX=clang++

# more verbose linker output
export LDFLAGS+=-Wl,--stats

# initial flags from dpkg-buildflags
export DEB_CXXFLAGS_MAINT_STRIP=-g
export CXXFLAGS=$(shell dpkg-buildflags --get CXXFLAGS)

# extra flags to reduce warnings that aren't very useful
export CXXFLAGS+=-Wno-conversion \
                 -Wno-unused-function \
                 -Wno-unused-variable \
                 -Wno-unused-private-field \
                 -Wno-deprecated-declarations \
                 -Wno-unknown-pragmas \

# disable clang plugins
defines=clang_use_chrome_plugins=false

# build using system toolchain
defines+=host_toolchain=\"//build/toolchain/linux/unbundle:default\"
defines+=custom_toolchain=\"//build/toolchain/linux/unbundle:default\"

# set the appropriate cpu architecture
DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
ifeq (i386,$(DEB_HOST_ARCH))
defines+=host_cpu=\"x86\" symbol_level=0
endif
ifeq (amd64,$(DEB_HOST_ARCH))
defines+=host_cpu=\"x64\"
endif
ifeq (arm64,$(DEB_HOST_ARCH))
defines+=host_cpu=\"arm64\"
endif
ifeq (armhf,$(DEB_HOST_ARCH))
defines+=host_cpu=\"arm\" arm_use_neon=false symbol_level=0
endif

# disabled features
defines+=is_debug=false \
         use_goma=false \
         use_ozone=false \
         use_vaapi=false \
         use_sysroot=false \
         use_allocator=\"none\" \
         use_libjpeg_turbo=true \
         use_custom_libcxx=false \
         use_gnome_keyring=false \
         use_unofficial_version_number=false \
         enable_vr=false \
         enable_nacl=false \
         enable_nacl_nonsfi=false \
         enable_swiftshader=false \
         enable_reading_list=false \
         enable_one_click_signin=false \
         enable_iterator_debugging=false \
         enable_hangout_services_extension=false \
         optimize_webui=false \
         enable_js_type_check=false \
         blink_symbol_level=0 \
         treat_warnings_as_errors=false \

# enabled features
defines+=use_gio=true \
         use_pulseaudio=true \
         link_pulseaudio=true \
         enable_widevine=true \
         v8_enable_backtrace=true \
         use_system_zlib=true \
         use_system_lcms2=true \
         use_system_libpng=true \
         use_system_libjpeg=true \
         use_system_freetype=true \
         use_system_harfbuzz=true \
         use_system_libopenjpeg2=true \
         concurrent_links=1 \
         proprietary_codecs=true \
         ffmpeg_branding=\"Chrome\" \
         fieldtrial_testing_like_official_build=true \

# handle parallel build options
njobs=1
ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
njobs=$(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
endif

%:
	dh $@

out/Release/gn:
	./tools/gn/bootstrap/bootstrap.py --skip-generate-buildfiles -j$(njobs)

override_dh_auto_configure:
	# output compiler information
	$(CXX) --version
	# prefer unbundled (system) libraries
	./debian/scripts/unbundle

override_dh_auto_build-arch: out/Release/gn
	./out/Release/gn gen out/Release --args="$(defines)"
	ninja -j$(njobs) -C out/Release chrome chrome_sandbox content_shell chromedriver
	cp out/Release/chrome out/Release/chromium
	cp out/Release/content_shell out/Release/chromium-shell
	cp out/Release/chrome_sandbox out/Release/chrome-sandbox
	cp out/Release/locales/en-US.pak out/Release/resources
	chmod 4755 out/Release/chrome-sandbox # suid sandbox
	sed -e s/@@PACKAGE@@/chromium/g -e s/@@MENUNAME@@/chromium/g \
	    < chrome/app/resources/manpage.1.in > out/Release/chromium.1

override_dh_auto_build-indep: out/Release/gn
	./out/Release/gn gen out/Release --args="$(defines)"
	ninja -j$(njobs) -C out/Release packed_resources
	rm -f out/Release/locales/en-US.pak

override_dh_auto_install-arch:
	dh_auto_install
	# update launcher script with build information
	sed 's|@BUILD_DIST@|$(shell cat /etc/debian_version)|' \
	    < debian/scripts/chromium > debian/chromium/usr/bin/chromium
	# move icons into /usr/share
	./debian/scripts/icons

override_dh_fixperms:
	dh_fixperms --exclude chrome-sandbox

override_dh_auto_clean:
	rm -rf out
	find . -name \*.pyc -execdir rm -f {} \;
	dh_auto_clean

###################### upstream source downloading ############################

url=https://gsdview.appspot.com/chromium-browser-official
version=$(shell dpkg-parsechangelog -S Version | sed s/-.*//)
extract=chromium-$(version)
tarfile=$(extract)-lite.tar
tarball=$(tarfile).xz
debvers=../chromium_$(version)
origtxz=$(debvers).orig.tar.xz
removed=$(debvers).files-removed
seconds=$(debvers).seconds

get-orig-source:
	wget -nv --show-progress -c $(url)/$(tarball) -O ../$(tarball)
	cp /usr/share/perl5/Devscripts/MkOrigtargz.pm debian/scripts/mk-origtargz
	patch -p1 < debian/scripts/mk-origtargz.patch
	date +%s > $(seconds)
	perl debian/scripts/mk-origtargz ../$(tarball) > $(removed)
	echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	test ! -e $(extract) || rm -rf $(extract)
	tar xf ../$(tarball)
	echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	while read line; do rm -rf $$line; done < $(removed)
	cd $(extract) && ../debian/scripts/check-upstream
	echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	test ! -e $(origtxz) || rm -f $(origtxz)
	tar cf - $(extract) | xz -6 -T $(njobs) - > $(origtxz)
	echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	rm -rf $(extract)
	echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds | tee seconds
	@mv -f seconds $(seconds)