# Copyright 2018 The Prometheus Authors
# 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.


# A common Makefile that includes rules to be reused in different prometheus projects.
# !!! Open PRs only against the prometheus/prometheus/Makefile.common repository!

# Example usage :
# Create the main Makefile in the root project directory. 
# include Makefile.common
# customTarget:
# 	@echo ">> Running customTarget"
#

# Ensure GOBIN is not set during build so that promu is installed to the correct path
unexport GOBIN

GO           ?= go
GOFMT        ?= $(GO)fmt
FIRST_GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
PROMU        := $(FIRST_GOPATH)/bin/promu
STATICCHECK  := $(FIRST_GOPATH)/bin/staticcheck
GOVENDOR     := $(FIRST_GOPATH)/bin/govendor
pkgs          = ./...

PREFIX                  ?= $(shell pwd)
BIN_DIR                 ?= $(shell pwd)
DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
DOCKER_REPO             ?= prom

.PHONY: all
all: style staticcheck unused build test

# This rule is used to forward a target like "build" to "common-build".  This
# allows a new "build" target to be defined in a Makefile which includes this
# one and override "common-build" without override warnings.
%: common-% ;

.PHONY: common-style
common-style:
	@echo ">> checking code style"
	! $(GOFMT) -d $$(find . -path ./vendor -prune -o -name '*.go' -print) | grep '^'

.PHONY: common-check_license
common-check_license:
	@echo ">> checking license header"
	@licRes=$$(for file in $$(find . -type f -iname '*.go' ! -path './vendor/*') ; do \
               awk 'NR<=3' $$file | grep -Eq "(Copyright|generated|GENERATED)" || echo $$file; \
       done); \
       if [ -n "$${licRes}" ]; then \
               echo "license header checking failed:"; echo "$${licRes}"; \
               exit 1; \
       fi

.PHONY: common-test-short
common-test-short:
	@echo ">> running short tests"
	$(GO) test -short $(pkgs)

.PHONY: common-test
common-test:
	@echo ">> running all tests"
	$(GO) test -race $(pkgs)

.PHONY: common-format
common-format:
	@echo ">> formatting code"
	$(GO) fmt $(pkgs)

.PHONY: common-vet
common-vet:
	@echo ">> vetting code"
	$(GO) vet $(pkgs)

.PHONY: common-staticcheck
common-staticcheck: $(STATICCHECK)
	@echo ">> running staticcheck"
	$(STATICCHECK) -ignore "$(STATICCHECK_IGNORE)" $(pkgs)

.PHONY: common-unused
common-unused: $(GOVENDOR)
	@echo ">> running check for unused packages"
	@$(GOVENDOR) list +unused | grep . && exit 1 || echo 'No unused packages'

.PHONY: common-build
common-build: promu
	@echo ">> building binaries"
	$(PROMU) build --prefix $(PREFIX)

.PHONY: common-tarball
common-tarball: promu
	@echo ">> building release tarball"
	$(PROMU) tarball --prefix $(PREFIX) $(BIN_DIR)

.PHONY: common-docker
common-docker:
	docker build -t "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .

.PHONY: common-docker-publish
common-docker-publish:
	docker push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)"

.PHONY: common-docker-tag-latest
common-docker-tag-latest:
	docker tag "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):latest"

.PHONY: promu
promu:
	GOOS= GOARCH= $(GO) get -u github.com/prometheus/promu

.PHONY: $(STATICCHECK)
$(STATICCHECK):
	GOOS= GOARCH= $(GO) get -u honnef.co/go/tools/cmd/staticcheck

.PHONY: $(GOVENDOR)
$(GOVENDOR):
	GOOS= GOARCH= $(GO) get -u github.com/kardianos/govendor