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 ###########################################################################
# Copyright 2017-2018 IoT.bzh
#
# author: Sebastien Douheret <sebastien@iot.bzh>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
###########################################################################

# Application Name
TARGET=xds-gdb


# Retrieve git tag/commit to set version & sub-version strings
GIT_DESC := $(shell git describe --always --tags --match "[0-9]*")
VERSION := $(firstword $(subst -, ,$(GIT_DESC)))
ifeq (-,$(findstring -,$(GIT_DESC)))
	SUB_VERSION := $(subst $(VERSION)-,,$(GIT_DESC))
endif
ifeq ($(VERSION), )
	VERSION := unknown-dev
endif
ifeq ($(SUB_VERSION), )
	SUB_VERSION := $(shell date +'%Y-%m-%d_%H%M%S')
endif

# Configurable variables for installation (default /opt/AGL/...)
ifeq ($(origin DESTDIR), undefined)
	DESTDIR := /opt/AGL/xds/gdb
endif

HOST_GOOS=$(shell go env GOOS)
HOST_GOARCH=$(shell go env GOARCH)
ARCH=$(HOST_GOOS)-$(HOST_GOARCH)
REPOPATH=gerrit.automotivelinux.org/gerrit/src/xds/$(TARGET)

EXT=
ifeq ($(HOST_GOOS), windows)
	EXT=.exe
endif

mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
ROOT_SRCDIR := $(patsubst %/,%,$(dir $(mkfile_path)))
ROOT_GOPRJ := $(abspath $(ROOT_SRCDIR)/../../../../../..)
LOCAL_BINDIR := $(ROOT_SRCDIR)/bin
LOCAL_TOOLSDIR := $(ROOT_SRCDIR)/tools/${HOST_GOOS}
PACKAGE_DIR := $(ROOT_SRCDIR)/package

export GOPATH := $(shell go env GOPATH):$(ROOT_GOPRJ)
export PATH := $(PATH):$(LOCAL_TOOLSDIR)

# Check Go version
GOVERSION := $(shell go version |grep -o '[0-9\.]*'|head -n 1)
GOVERMAJ := $(shell echo $(GOVERSION) |cut -f1 -d.)
GOVERMIN := $(shell echo $(GOVERSION) |cut -f2 -d.)
CHECKGOVER := $(shell [ $(GOVERMAJ) -gt 1 -o \( $(GOVERMAJ) -eq 1 -a $(GOVERMIN) -ge 8 \) ] && echo true)
CHECKERRMSG := "ERROR: Go version 1.8.1 or higher is requested (current detected version: $(GOVERSION))."


VERBOSE_1 := -v
VERBOSE_2 := -v -x

# Release or Debug mode
ifeq ($(filter 1,$(RELEASE) $(REL)),)
	GO_LDFLAGS=
	# disable compiler optimizations and inlining
	GO_GCFLAGS=-N -l
	BUILD_MODE="Debug mode"
else
	# optimized code without debug info
	GO_LDFLAGS=-s -w
	GO_GCFLAGS=
	BUILD_MODE="Release mode"
endif

# Build Package name (model: <target>_<arch>-<version>.<nb_commit_from_last_tag>.zip)
ifeq (-g,$(findstring -g,$(GIT_DESC)))
	NB_COMMIT=$(firstword $(subst -, ,$(SUB_VERSION)))
else
	NB_COMMIT=0
endif
PACKAGE_ZIPFILE := $(TARGET)_$(ARCH)-$(VERSION).$(NB_COMMIT).zip

.PHONY: all
all: vendor build

.PHONY: build
build: checkgover
	@echo "### Build $(TARGET) (version $(VERSION), subversion $(SUB_VERSION) - $(BUILD_MODE))";
	@cd $(ROOT_SRCDIR); $(BUILD_ENV_FLAGS) go build $(VERBOSE_$(V)) -i -o $(LOCAL_BINDIR)/$(TARGET)$(EXT) -ldflags "$(GO_LDFLAGS) -X main.AppVersion=$(VERSION) -X main.AppSubVersion=$(SUB_VERSION)" -gcflags "$(GO_GCFLAGS)" .

test: tools/glide
	go test --race $(shell $(LOCAL_TOOLSDIR)/glide novendor)

vet: tools/glide
	go vet $(shell $(LOCAL_TOOLSDIR)/glide novendor)

fmt: tools/glide
	go fmt $(shell $(LOCAL_TOOLSDIR)/glide novendor)

.PHONY: clean
clean:
	rm -rf $(LOCAL_BINDIR)/* debug $(ROOT_GOPRJ)/pkg/*/$(REPOPATH) $(PACKAGE_DIR)

.PHONY: distclean
distclean: clean
	rm -rf $(LOCAL_BINDIR) && (cd $(ROOT_SRCDIR) && rm -rf ./tools ./glide.lock ./vendor ./*.zip)


.PHONY: scripts
scripts:
	@mkdir -p $(LOCAL_BINDIR) && cp -rf scripts/*.sh scripts/xds-utils $(LOCAL_BINDIR)

.PHONY: release
release:
	RELEASE=1 make -f $(ROOT_SRCDIR)/Makefile clean build

package: clean vendor build
	@mkdir -p $(PACKAGE_DIR)/$(TARGET)
	@cp -a $(LOCAL_BINDIR)/*gdb$(EXT) $(PACKAGE_DIR)/$(TARGET)
ifneq ($(GOOS), windows)
	@cp -r $(ROOT_SRCDIR)/conf.d $(ROOT_SRCDIR)/scripts $(PACKAGE_DIR)/$(TARGET)
endif
	cd $(PACKAGE_DIR) && zip -r $(ROOT_SRCDIR)/$(PACKAGE_ZIPFILE) ./$(TARGET)

.PHONY: package-all
package-all:
	@echo "# Build linux amd64..."
	GOOS=linux GOARCH=amd64 RELEASE=1 make -f $(ROOT_SRCDIR)/Makefile package
	@echo "# Build windows amd64..."
	GOOS=windows GOARCH=amd64 RELEASE=1 make -f $(ROOT_SRCDIR)/Makefile package
	@echo "# Build darwin amd64..."
	GOOS=darwin GOARCH=amd64 RELEASE=1 make -f $(ROOT_SRCDIR)/Makefile package
	make -f $(ROOT_SRCDIR)/Makefile clean

.PHONY: install
install:
	@test -e $(LOCAL_BINDIR)/$(TARGET)$(EXT) || { echo "Please execute first: make all\n"; exit 1; }
	export DESTDIR=$(DESTDIR) && $(ROOT_SRCDIR)/scripts/install.sh

.PHONY: uninstall
uninstall:
	export DESTDIR=$(DESTDIR) && $(ROOT_SRCDIR)/scripts/install.sh uninstall

vendor: tools/glide glide.yaml
	$(LOCAL_TOOLSDIR)/glide install --strip-vendor

vendor/debug: vendor
	(cd vendor/gerrit.automotivelinux.org/gerrit/src/xds && \
		rm -rf xds-common.git && ln -s ../../../../../../xds-common xds-common.git && \
		rm -rf xds-agent.git && ln -s ../../../../../../xds-agent xds-agent.git)

.PHONY: tools/glide
tools/glide:
	@test -f $(LOCAL_TOOLSDIR)/glide || { \
		echo "Downloading glide"; \
		mkdir -p $(LOCAL_TOOLSDIR); \
		curl --silent --connect-timeout 60 --retry 3 -L https://glide.sh/get | GOBIN=$(LOCAL_TOOLSDIR)  sh; \
	}

.PHONY:
checkgover:
	@test "$(CHECKGOVER)" = "true" || { echo -e $(CHECKERRMSG); exit 1; }


.PHONY: help
help:
	@echo "Main supported rules:"
	@echo "  all                (default)"
	@echo "  build"
	@echo "  release"
	@echo "  package"
	@echo "  install"
	@echo "  uninstall"
	@echo "  clean"
	@echo "  distclean"
	@echo ""
	@echo "Influential make variables:"
	@echo "  V                 - Build verbosity {0,1,2}."
	@echo "  BUILD_ENV_FLAGS   - Environment added to 'go build'."