feat: add option --version

Author: marjune163

build/build.sh

@@ -3,10 +3,11 @@
 cd $(dirname "$0")
 
 TMP='/tmp'
-LDFLAGS='-s -w'
 OUTDIR='../output'
 MAINNAME='ghfs'
-VERSION="$(git describe --abbrev=0 --tags 2> /dev/null || git rev-parse --abbrev-ref HEAD 2> /dev/null)"
+MOD=$(go list ../src/)
+VERSION=$(git describe --abbrev=0 --tags 2> /dev/null || git rev-parse --abbrev-ref HEAD 2> /dev/null)
+LDFLAGS="-s -w -X  $MOD/version.appVer=$VERSION"
 LICENSE='../LICENSE'
 
 mkdir -p "$OUTDIR"

src/param/cli.go

@@ -4,6 +4,7 @@ import (
 	"../goNixArgParser"
 	"../serverErrHandler"
 	"../util"
+	"../version"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -130,6 +131,9 @@ func init() {
 	err = options.AddFlagValue("config", "--config", "", "", "print this help")
 	serverErrHandler.CheckFatal(err)
 
+	err = options.AddFlag("version", "--version", "", "print version")
+	serverErrHandler.CheckFatal(err)
+
 	err = options.AddFlags("help", []string{"-h", "--help"}, "", "print this help")
 	serverErrHandler.CheckFatal(err)
 }
@@ -147,6 +151,12 @@ func doParseCli() []*Param {
 	for i, length := 0, len(results); i < length; i++ {
 		result := results[i]
 
+		// version
+		if result.HasFlagKey("version") {
+			version.PrintVersion()
+			os.Exit(0)
+		}
+
 		// help
 		if result.HasFlagKey("help") {
 			cliCmd.PrintHelp()

src/version/main.go

@@ -0,0 +1,18 @@
+package version
+
+import (
+	"fmt"
+	"runtime"
+)
+
+var appVer = "dev"
+
+const entryFormat = "%-8s %s\n"
+
+func PrintVersion() {
+	fmt.Println("GHFS: Go HTTP File Server")
+	fmt.Printf(entryFormat, "Version:", appVer)
+	fmt.Printf(entryFormat, "SDK:", runtime.Version())
+	fmt.Printf(entryFormat, "OS:", runtime.GOOS)
+	fmt.Printf(entryFormat, "ARCH:", runtime.GOARCH)
+}