Add version flag

Makefile

@@ -1,7 +1,13 @@
 
+GIT_REVISION=`git rev-parse --short HEAD`
+SPQR_VERSION=`git describe --tags --abbrev=0`
+LDFLAGS=-ldflags "-X github.com/yezzey-gp/yproxy/pkg.GitRevision=${GIT_REVISION} -X github.com/yezzey-gp/yproxy/pkg.SpqrVersion=${SPQR_VERSION}"
+
+####################### BUILD #######################
+
 build:
 	mkdir -p devbin
-	go build -o devbin/yproxy ./cmd/yproxy
+	go build -pgo=auto -o devbin/yproxy $(LDFLAGS) ./cmd/yproxy
 	go build -o devbin/client ./cmd/client
 
 ####################### TESTS #######################

cmd/yproxy/main.go

@@ -4,6 +4,7 @@ import (
 	"github.com/spf13/cobra"
 
 	"github.com/yezzey-gp/yproxy/config"
+	"github.com/yezzey-gp/yproxy/pkg"
 	"github.com/yezzey-gp/yproxy/pkg/core"
 	"github.com/yezzey-gp/yproxy/pkg/ylogger"
 )
@@ -34,6 +35,7 @@ var rootCmd = &cobra.Command{
 
 		return instance.Run(instanceCnf)
 	},
+	Version:       pkg.YproxyVersionRevision,
 }
 
 func init() {

pkg/version.go

@@ -0,0 +1,10 @@
+package pkg
+
+import "fmt"
+
+var (
+	// These variables are here only to show current version. They are set in makefile during build process
+	SpqrVersion         = "devel"
+	GitRevision         = "devel"
+	YproxyVersionRevision = fmt.Sprintf("%s-%s", SpqrVersion, GitRevision)
+)