Enable crossbuilds via promu (#1)

Add promu for builds

Author: deathowl

.gitignore

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+.build

.promu.yml

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+go: 1.6.3
+verbose: false
+repository:
+    path: github.com/deathowl/zookeeper_exporter
+build:
+    prefix: .
+    binaries:
+        - name: zookeeper_exporter
+          path: .
+    flags: -a -tags netgo
+    ldflags: |
+        -s
+        -X {{repoPath}}/version.Version={{.Version}}
+        -X {{repoPath}}/version.Revision={{.Revision}}
+        -X {{repoPath}}/version.Branch={{.Branch}}
+        -X {{repoPath}}/version.BuildUser={{user}}@{{host}}
+        -X {{repoPath}}/version.BuildDate={{date "20060829-15:04:05"}}
+tarball:
+    prefix: .
+crossbuild:
+    platforms:
+        - linux/amd64
+        - linux/386
+        - darwin/amd64
+        - darwin/386
+        - windows/amd64
+        - windows/386
+        - freebsd/amd64
+        - freebsd/386
+        - openbsd/amd64
+        - openbsd/386
+        - netbsd/amd64
+        - netbsd/386
+        - dragonfly/amd64
+        - linux/arm
+        - linux/arm64
+        - freebsd/arm
+        - openbsd/arm
+        - netbsd/arm
+        - linux/ppc64
+        - linux/ppc64le
+        - linux/mips64
+        - linux/mips64le

Makefile

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+# Copyright 2015 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.
+
+GO           := GO15VENDOREXPERIMENT=1 go
+FIRST_GOPATH := $(firstword $(subst :, ,$(GOPATH)))
+PROMU        := $(FIRST_GOPATH)/bin/promu
+pkgs          = $(shell $(GO) list ./... | grep -v /vendor/)
+
+PREFIX                  ?= $(shell pwd)
+BIN_DIR                 ?= $(shell pwd)
+DOCKER_IMAGE_NAME       ?= zk_exporter
+DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
+
+ifdef DEBUG
+	bindata_flags = -debug
+endif
+
+
+all: format build
+
+style:
+	@echo ">> checking code style"
+	@! gofmt -d $(shell find . -path ./vendor -prune -o -name '*.go' -print) | grep '^'
+
+format:
+	@echo ">> formatting code"
+	@$(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 vet tarball docker promu

VERSION

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+1.0.0