#!/usr/bin/make -f

export DEB_BUILD_MAINT_OPTIONS=hardening=+bindnow
include /usr/share/rustc/architecture.mk
include /usr/share/dpkg/buildopts.mk

%:
	dh $@

export systemdsystemunitdir:=$(shell pkg-config systemd --variable=systemdsystemunitdir)
export modulesdir=/usr/lib/modules-load.d

# Build the Rust crates offline against the librust-*-dev build
# dependencies (unpacked under /usr/share/cargo/registry) rather than
# fetching them from crates.io. Keep the cargo state under target/ so
# the source tree stays pristine.
export CARGO_HOME=$(CURDIR)/target/cargo-home
export CARGO_NET_OFFLINE=true
export CARGO_TARGET_DIR=$(CURDIR)/target
# Emit debug info so dh_strip can produce useful -dbgsym packages.
export CARGO_PROFILE_RELEASE_DEBUG=true
# Build the Rust code for the host architecture, linking with the
# matching (cross) compiler.
RUST_TARGET_DIR = target/$(DEB_HOST_RUST_TYPE)/release
export CARGO_TARGET_$(shell echo $(DEB_HOST_RUST_TYPE) | tr a-z- A-Z_)_LINKER = $(DEB_HOST_GNU_TYPE)-gcc

override_dh_auto_configure:
	dh_auto_configure -- --enable-doc			\
	 --libexecdir='$$(libdir)'				\
	 --with-systemdsystemunitdir=$(systemdsystemunitdir)	\
	 RUST_TARGET=$(DEB_HOST_RUST_TYPE)

# The crate versions pinned in the upstream Cargo.lock need not match
# those packaged in Debian, and Debian repackages some crates without
# an upstream checksum.  Regenerate Cargo.lock against the local
# registry for the build, then restore the upstream Cargo.lock so the
# source tree is left unchanged.
execute_before_dh_auto_build:
	mkdir -p $(CARGO_HOME)
	cp debian/cargo-config.toml $(CARGO_HOME)/config.toml
	test -f target/Cargo.lock.orig || cp Cargo.lock target/Cargo.lock.orig
	cargo generate-lockfile --offline
execute_after_dh_auto_build:
	cargo build --release --locked --target $(DEB_HOST_RUST_TYPE) \
	 -p ddccontrol-dbgen
# help2man must run the program, which is impossible when cross-building,
# so then use the pre-generated copy in debian/.  Otherwise warn if that
# copy is stale; refresh it with: cp target/ddccontrol-dbgen.1 debian/
ifeq ($(DEB_BUILD_GNU_TYPE),$(DEB_HOST_GNU_TYPE))
	DDCCONTROL_DBGEN=$(RUST_TARGET_DIR)/ddccontrol-dbgen \
	 help2man --no-info --include=debian/ddccontrol-dbgen.h2m \
	 --output=target/ddccontrol-dbgen.1 debian/ddccontrol-dbgen-help
	cmp -s target/ddccontrol-dbgen.1 debian/ddccontrol-dbgen.1 \
	 || echo 'warning: debian/ddccontrol-dbgen.1 is out of date' >&2
else
	cp debian/ddccontrol-dbgen.1 target/ddccontrol-dbgen.1
endif

override_dh_auto_install:
	dh_auto_install -- modulesdir=$(modulesdir) dbusconfdir=/usr/share/dbus-1/system.d
execute_after_dh_auto_install:
	install -D $(RUST_TARGET_DIR)/ddccontrol-dbgen \
	 debian/ddccontrol-dbgen/usr/bin/ddccontrol-dbgen
	cp Cargo.lock target/Cargo.lock.used
	mv target/Cargo.lock.orig Cargo.lock

override_dh_auto_test:

# Record the Debian packages of the Rust crates statically linked into
# the binaries.
execute_before_dh_gencontrol:
	for p in $$(sed -n 's/^name = "\(.*\)"/\1/p' target/Cargo.lock.used); do \
	  v=$$(sed -n "/^name = \"$$p\"$$/{n;s/^version = \"\(.*\)\"/\1/p}" target/Cargo.lock.used); \
	  test -d /usr/share/cargo/registry/$$p-$$v || continue; \
	  dpkg-query -S /usr/share/cargo/registry/$$p-$$v \
	   | sed 's/: .*//; s/, /\n/g' \
	   | grep -E '^[^:]+(:$(DEB_HOST_ARCH))?$$'; \
	done | sort -u | xargs -r dpkg-query -f '$${Package} (= $${Version}), ' -W \
	 | sed 's/, $$//; s/^/cargo:Static-Built-Using=/' > target/static-built-using
	for p in ddccontrol libddccontrol1 ddccontrol-dbgen; do \
	  cat target/static-built-using >> debian/$$p.substvars; \
	done

execute_before_dh_clean:
	test ! -f target/Cargo.lock.orig || mv target/Cargo.lock.orig Cargo.lock

execute_after_dh_install:
	@echo 'Strip wrong #include "config.h" from ddcci.h (bug#518083)'
	sed --in-place 's:[#]include "config.h"::' \
	 debian/libddccontrol-dev/usr/include/ddccontrol/ddcci.h