Add version information

cmd/root.go

@@ -30,6 +30,7 @@ var log = logrus.New()
 var (
 	cfgFile  string
 	logLevel string
+	Version  string
 )
 
 // RootCmd represents the base command when called without any subcommands

cmd/version.go

@@ -25,7 +25,7 @@ var versionCmd = &cobra.Command{
 	Short: "Print the version number of php-fpm_exporter",
 	Long:  `All software has versions. This is php-fpm_exporter's'`,
 	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Println("php-fpm_exporter v0.9 -- HEAD")
+		fmt.Printf("php-fpm_exporter %v\n", Version)
 	},
 }
 

main.go

@@ -13,8 +13,18 @@
 
 package main
 
-import "github.com/hipages/php-fpm_exporter/cmd"
+import (
+	"fmt"
+	"github.com/hipages/php-fpm_exporter/cmd"
+)
+
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "unknown"
+)
 
 func main() {
+	cmd.Version = fmt.Sprintf("%v, commit %v, built at %v", version, commit, date)
 	cmd.Execute()
 }