Use Makefile.common from Prometheus

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Makefile

@@ -11,50 +11,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-GO    := GO15VENDOREXPERIMENT=1 go
+include Makefile.common
-PROMU := $(GOPATH)/bin/promu
+
-pkgs   = $(shell $(GO) list ./... | grep -v /vendor/)
+STATICCHECK_IGNORE = \
+  github.com/prometheus/statsd_exporter/main.go:SA1019 \
 
-PREFIX                  ?= $(shell pwd)
-BIN_DIR                 ?= $(shell pwd)
 DOCKER_IMAGE_NAME       ?= statsd-exporter
-DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
-
-
-all: format build test
-
-style:
-	@echo ">> checking code style"
-	@! gofmt -d $(shell find . -path ./vendor -prune -o -name '*.go' -print) | grep '^'
-
-test:
-	@echo ">> running tests"
-	@$(GO) test -short $(pkgs)
-
-format:
-	@echo ">> formatting code"
-	@$(GO) fmt $(pkgs)
-
-vet:
-	@echo ">> vetting code"
-	@$(GO) vet $(pkgs)
-
-build: promu
-	@echo ">> building binaries"
-	@$(PROMU) build --prefix $(PREFIX)
-
-tarball: promu
-	@echo ">> building release tarball"
-	@$(PROMU) tarball --prefix $(PREFIX) $(BIN_DIR)
-
-docker:
-	@echo ">> building docker image"
-	@docker build -t "$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
-
-promu:
-	@GOOS=$(shell uname -s | tr A-Z a-z) \
-		GOARCH=$(subst x86_64,amd64,$(patsubst i%86,386,$(shell uname -m))) \
-		$(GO) get -u github.com/prometheus/promu
-
-
-.PHONY: all style format build test vet tarball docker promu

Makefile.common

@@ -0,0 +1,100 @@
+# 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))
+
+all: style staticcheck unused build test
+
+style:
+	@echo ">> checking code style"
+	! $(GOFMT) -d $$(find . -path ./vendor -prune -o -name '*.go' -print) | grep '^'
+
+check_license:
+	@echo ">> checking license header"
+	@licRes=$$(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
+
+test-short:
+	@echo ">> running short tests"
+	$(GO) test -short $(pkgs)
+
+test:
+	@echo ">> running all tests"
+	$(GO) test -race $(pkgs)
+
+format:
+	@echo ">> formatting code"
+	$(GO) fmt $(pkgs)
+
+vet:
+	@echo ">> vetting code"
+	$(GO) vet $(pkgs)
+
+staticcheck: $(STATICCHECK)
+	@echo ">> running staticcheck"
+	$(STATICCHECK) -ignore "$(STATICCHECK_IGNORE)" $(pkgs)
+
+unused: $(GOVENDOR)
+	@echo ">> running check for unused packages"
+	@$(GOVENDOR) list +unused | grep . && exit 1 || echo 'No unused packages'
+
+build: promu
+	@echo ">> building binaries"
+	$(PROMU) build --prefix $(PREFIX)
+
+tarball: promu
+	@echo ">> building release tarball"
+	$(PROMU) tarball --prefix $(PREFIX) $(BIN_DIR)
+
+docker:
+	docker build -t "$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
+
+promu:
+	GOOS= GOARCH= $(GO) get -u github.com/prometheus/promu
+
+$(FIRST_GOPATH)/bin/staticcheck:
+	GOOS= GOARCH= $(GO) get -u honnef.co/go/tools/cmd/staticcheck
+
+$(FIRST_GOPATH)/bin/govendor:
+	GOOS= GOARCH= $(GO) get -u github.com/kardianos/govendor
+
+.PHONY: all style check_license format build test vet assets tarball docker promu staticcheck $(FIRST_GOPATH)/bin/staticcheck govendor $(FIRST_GOPATH)/bin/govendor

main.go

@@ -122,7 +122,7 @@ func watchConfig(fileName string, mapper *metricMapper) {
 			// Re-add the file watcher since it can get lost on some changes. E.g.
 			// saving a file with vim results in a RENAME-MODIFY-DELETE event
 			// sequence, after which the newly written file is no longer watched.
-			err = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
+			_ = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
 		case err := <-watcher.Error:
 			log.Errorln("Error watching config:", err)
 		}