Support --version

refs #335

internal/command/command.go

@@ -1,12 +1,15 @@
 package command
 
 import (
+	"fmt"
+	"github.com/icinga/icingadb/internal"
 	"github.com/icinga/icingadb/pkg/config"
 	"github.com/icinga/icingadb/pkg/icingadb"
 	"github.com/icinga/icingadb/pkg/icingaredis"
 	"github.com/icinga/icingadb/pkg/utils"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
+	"os"
 )
 
 type Command struct {
@@ -21,6 +24,11 @@ func New() *Command {
 		utils.Fatal(err)
 	}
 
+	if flags.Version {
+		fmt.Println("Icinga DB version:", internal.Version)
+		os.Exit(0)
+	}
+
 	cfg, err := config.FromYAMLFile(flags.Config)
 	if err != nil {
 		utils.Fatal(err)

internal/version.go

@@ -0,0 +1,3 @@
+package internal
+
+var Version = "v1.0.0-rc2-dev"

pkg/config/config.go

@@ -15,6 +15,8 @@ type Config struct {
 
 // Flags defines CLI flags.
 type Flags struct {
+	// Version decides whether to just print the version and exit.
+	Version bool `long:"version" description:"print version and exit"`
 	// Config is the path to the config file
 	Config string `short:"c" long:"config" description:"path to config file" required:"true" default:"./config.yml"`
 	// Datadir is the location of the data directory