如题，这是我常在在项目中使用到的Makefile和main.go文件，在程序执行的时候就可以知道git commit、version和built time，方便版本管理和更新迭代，以及问题排查。

Makefile

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NAME := gw
VERSION ?= 0.0.1
COMMIT  := $(shell git log -n 1 --pretty=format:"%h")
BRANCH  := $(shell git name-rev --name-only HEAD)
NOW     := $(shell date +%F_%T)
VARS    := -X main.GitCommit=$(COMMIT) -X main.Version=$(VERSION) -X main.BuiltTime=$(NOW) -X main.GitBranch=$(BRANCH)

ifeq ($(strip $(DEBUG)), true)
        BUILD_ARGS = -v -gcflags="all=-N -l"
else
        BUILD_ARGS = -v -trimpath \
            -gcflags="all=-trimpath=$(PWD)" \
            -asmflags="all=-trimpath=$(PWD)" \
            -ldflags '-extldflags "-static"'
endif

GOBUILD=go build $(BUILD_ARGS)

export GO111MODULE=on

build:
    GOOS=linux GOARCH=amd64 $(GOBUILD) -o bin/$(NAME) .

deps:
    go mod tidy -v
.PHONY:build

main.go

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var (
    help      bool
    conf      string
    Version   string
    BuiltTime string
    GitCommit string
    GitBranch string
)

func init() {
    flag.BoolVar(&help, "h", false, "帮助信息")
    flag.StringVar(&conf, "c", "", "配置文件")
}

func main() {
    flag.Parse()
    if help {
        flag.Usage()
        fmt.Printf("\nversion: %s, commit: %s, branch: %s, built at: %s.\n",
            Version, GitCommit, GitBranch, BuiltTime)
        os.Exit(0)
    }
    // your code here ...
}