add Makefile

Makefile

@@ -0,0 +1,57 @@
+SHELL := /bin/bash
+
+# Build targets
+TARGETS ?= darwin/amd64 linux/amd64 linux/386 linux/arm linux/arm64 linux/ppc64le linux/s390x windows/amd64
+TARGET_OBJS ?= darwin-amd64.tar.gz darwin-amd64.tar.gz.sha256 linux-amd64.tar.gz linux-amd64.tar.gz.sha256 linux-386.tar.gz linux-386.tar.gz.sha256 linux-arm.tar.gz linux-arm.tar.gz.sha256 linux-arm64.tar.gz linux-arm64.tar.gz.sha256 linux-ppc64le.tar.gz linux-ppc64le.tar.gz.sha256 linux-s390x.tar.gz linux-s390x.tar.gz.sha256 windows-amd64.zip windows-amd64.zip.sha256
+
+# Go options
+GO        ?= go
+PKG       := $(shell go mod vendor)
+TAGS      :=
+TESTS     := .
+TESTFLAGS :=
+LDFLAGS   := -w -s
+GOFLAGS   :=
+BINDIR    := $(CURDIR)/bin
+BINARIES := k3d
+
+# go source files, ignore vendor directory
+SRC = $(shell find . -type f -name '*.go' -not -path "./vendor/*")
+
+.PHONY: all build build-cross clean install uninstall fmt simplify check run bootstrap
+
+all: check install
+
+build: 
+	$(GO) build -i $(GOFLAGS) -tags '$(TAGS)' -ldflags '$(LDFLAGS)' -o '$(BINDIR)/$(BINARIES)'
+
+build-cross: LDFLAGS += -extldflags "-static"
+build-cross:	
+	CGO_ENABLED=0 gox -parallel=3 -output="_dist/{{.OS}}-{{.Arch}}/$(BINARIES)" -osarch='$(TARGETS)' $(GOFLAGS) $(if $(TAGS),-tags '$(TAGS)',) -ldflags '$(LDFLAGS)'
+
+clean:
+	@rm -rf $(BINDIR) _dist/
+
+fmt:
+	@gofmt -l -w $(SRC)
+
+simplify:
+	@gofmt -s -l -w $(SRC)
+
+check:
+	@test -z $(shell gofmt -l main.go | tee /dev/stderr) || echo "[WARN] Fix formatting issues with 'make fmt'"
+	@for d in $$(go list ./... | grep -v /vendor/); do golint $${d}; done
+	@go vet ${SRC}
+
+# Check for required executables 
+HAS_GOX := $(shell command -v gox;)
+HAS_GIT := $(shell command -v git;)
+
+bootstrap:
+ifndef HAS_GOX
+	go get -u github.com/mitchellh/gox
+endif
+
+ifndef HAS_GIT
+	$(error You must install Git)
+endif