feat: add version into manager-api (apache#866)

api/VERSION

@@ -0,0 +1 @@
+v2.1-rc1

api/build.sh

@@ -19,6 +19,9 @@ set -ex
 export ENV=local
 pwd=`pwd`
 
+VERSION=$(cat ./api/VERSION)
+GIT_VERSION=$(git log -1 --pretty=format:%h)
+
 rm -rf output && mkdir -p output/conf && mkdir -p output/dag-to-lua
 
 # get dag-to-lua lib
@@ -29,7 +32,7 @@ if [[ ! -f "dag-to-lua-1.1/lib/dag-to-lua.lua" ]]; then
 fi
 
 # build
-cd ./api && go build -o ../output/manager-api . && cd ..
+cd ./api && go build -o ../output/manager-api -ldflags "-X main.Version=${VERSION}(${GIT_VERSION})" . && cd ..
 
 cp ./api/conf/schema.json ./output/conf/schema.json
 cp ./api/conf/conf.yaml ./output/conf/conf.yaml

api/conf/conf.go

@@ -17,7 +17,6 @@
 package conf
 
 import (
-	"flag"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -93,14 +92,9 @@ type Config struct {
 	Authentication Authentication
 }
 
-func init() {
+func Init(dir string) {
 	//go test
-	if workDir := os.Getenv("APISIX_API_WORKDIR"); workDir != "" {
-		WorkDir = workDir
-	} else {
-		flag.StringVar(&WorkDir, "p", ".", "current work dir")
-		flag.Parse()
-	}
+	WorkDir = dir
 
 	setConf()
 	setEnvironment()

api/main.go

@@ -18,6 +18,7 @@ package main
 
 import (
 	"context"
+	"flag"
 	"fmt"
 	"net/http"
 	"os"
@@ -33,6 +34,26 @@ import (
 	"github.com/apisix/manager-api/log"
 )
 
+var Version string
+
+func init() {
+	showVersion := flag.Bool("v", false, "show version")
+	workDir := flag.String("p", ".", "current work dir")
+
+	flag.Parse()
+
+	if *showVersion {
+		fmt.Fprintf(os.Stdout, "manager-apisix version: %s\n", Version)
+		os.Exit(0)
+	}
+
+	if dir := os.Getenv("APISIX_API_WORKDIR"); dir != "" {
+		conf.Init(dir)
+	} else {
+		conf.Init(*workDir)
+	}
+}
+
 func main() {
 
 	if err := storage.InitETCDClient(conf.ETCDEndpoints); err != nil {