#!/usr/bin/make -f

# Start build by executing:
# $ debuild --prepend-path /usr/local/bin -i -us -uc

# Uncomment this line out to make installation process more chatty.
# Keep it on until we know there's no outstanding problems with installation.
# export DH_VERBOSE=1

include /usr/share/dpkg/buildflags.mk

# Retrieve bazel's view of the current compilation_mode
compilation_mode :=
default_compilation_mode := \
  $(shell cd cvd; \
          bazel build //:build_compilation_mode_txt >/dev/null 2>&1; \
	  cat bazel-bin/build/compilation_mode.txt)
$(if $(default_compilation_mode),,$(error Bazel install is broken))

filters := $(if $(filter noopt,${DEB_BUILD_OPTIONS}),-O%,)
ifneq (${filters},)
  # If DEB_BUILD_OPTIONS=noopt is set, assume the user wants debug symbol
  # packages and no optimization. Override bazel defaults, if necessary.
  ifneq (${default_compilation_mode},dbg)
    compilation_mode := --compilation_mode=dbg
  endif
else
  ifeq (${default_compilation_mode},fastbuild)
    filters := -g -O%
  endif
  ifeq (${default_compilation_mode},dbg)
    filters := -O%
  endif
  ifeq (${default_compilation_mode},opt)
    filters :=
  endif
endif

# Convert dpkg-buildflags to bazel flags, filtering out debug and optimization
# flags as necessary
conlyopts := $(foreach flag,${CFLAGS},$(if $(filter ${filters},${flag}),,--conlyopt="${flag}"))
cxxopts   := $(foreach flag,${CXXFLAGS},$(if $(filter ${filters},${flag}),,--cxxopt="${flag}"))
linkopts  := $(foreach flag,${LDFLAGS},--linkopt="${flag}")

# Force llvm.ld to use sha1 build-id instead of blake3
linkopts  += --linkopt="-Wl,--build-id=sha1"

ifeq ($(filter ${filters},-g),)
# When debug packaging is enabled, tell bazel not to strip debuginfo
copts := --strip=never
# Clang defaults to emitting dwarf-5, which at the time of writing the debug
# symbol handing in debuild does not like, so limit it to dwarf-4.
copts += --copt="-gdwarf-4"
endif

cuttlefish_common := debian/cuttlefish-base/usr/lib/cuttlefish-common

disk_cache_arg :=
ifneq ($(strip ${BAZEL_DISK_CACHE_DIR}),)
  disk_cache_arg := --disk_cache="${BAZEL_DISK_CACHE_DIR}"
endif

remote_cache_arg :=
ifneq ($(strip ${BAZEL_REMOTE_CACHE}),)
  remote_cache_arg := --google_default_credentials --remote_cache="${BAZEL_REMOTE_CACHE}/${BAZEL_CACHE_VERSION}"
endif

%:
	dh $@ --with=config-package

.PHONY: override_dh_installinit
override_dh_installinit:
	dh_installinit --name=cuttlefish-host-resources
	dh_installinit

# the `--workspace_status_command` flag path depends on the current working directory of base/cvd
.PHONY: override_dh_auto_build
override_dh_auto_build:
	cd cvd && bazel build ${remote_cache_arg} ${disk_cache_arg} ${compilation_mode} ${conlyopts} ${copts} ${cxxopts} ${linkopts} 'cuttlefish/package:cvd' --spawn_strategy=local --workspace_status_command=../stamp_helper.sh --build_tag_filters=-clang-tidy
	dh_auto_build

# Only generate optimized DWARF if debug is enabled
.PHONY: override_dh_dwz
override_dh_dwz:
	$(if $(filter ${filters},-g),,dh_dwz)

# Only generate dbgsym package if debug is enabled
.PHONY: override_dh_strip
override_dh_strip:
	dh_strip $(if $(filter ${filters},-g),--no-automatic-dbgsym,)

# Remove bazel metadata during installation
.PHONY: override_dh_install
override_dh_install:
	dh_install
	rm -rf ${cuttlefish_common}/bin/cvd.repo_mapping
	rm -rf ${cuttlefish_common}/bin/cvd.runfiles*

# Repair output files bazel actions made executable
.PHONY: override_dh_fixperms
override_dh_fixperms:
	dh_fixperms
	chmod -x ${cuttlefish_common}/bin/*.json
	find ${cuttlefish_common}/etc -type f -exec chmod -x '{}' ';'