cmd: add version (#177)

Makefile

@@ -14,11 +14,13 @@
 # limitations under the License.
 
 GOBIN := $(shell pwd)/bin
+VERSION ?= $(shell git rev-parse --abbrev-ref HEAD)
+COMMIT ?= $(shell git describe --match=NeVeRmAtCh --always --abbrev=40 --dirty)
 DEBUG ?=
 DOCKERPREFIX ?=
 BUILD_TAGS ?=
 LDFLAGS ?= 
-BUILDFLAGS := $(BUILDFLAGS) -gcflags '$(GCFLAGS)' -ldflags '$(LDFLAGS)' -tags '${BUILD_TAGS}'
+BUILDFLAGS := $(BUILDFLAGS) -gcflags '$(GCFLAGS)' -ldflags '$(LDFLAGS) -X main.Version=$(VERSION) -X main.Commit=$(COMMIT)' -tags '$(BUILD_TAGS)'
 ifneq ("$(DEBUG)", "")
 	BUILDFLAGS += -race
 endif

cmd/tiproxy/main.go

@@ -16,6 +16,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/pingcap/TiProxy/lib/config"
@@ -26,10 +27,16 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var (
+	Version = "test"
+	Commit  = "test commit"
+)
+
 func main() {
 	rootCmd := &cobra.Command{
-		Use:   os.Args[0],
-		Short: "start the proxy server",
+		Use:     os.Args[0],
+		Short:   "start the proxy server",
+		Version: fmt.Sprintf("%s, commit %s", Version, Commit),
 	}
 
 	configFile := rootCmd.PersistentFlags().String("config", "", "proxy config file path")

cmd/tiproxyctl/main.go

@@ -15,15 +15,22 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"strings"
 
 	"github.com/pingcap/TiProxy/lib/cli"
 	"github.com/pingcap/TiProxy/lib/util/cmd"
 )
 
+var (
+	Version = "test"
+	Commit  = "test commit"
+)
+
 func main() {
 	rootCmd := cli.GetRootCmd(nil)
+	rootCmd.Version = fmt.Sprintf("%s, commit %s", Version, Commit)
 	rootCmd.Use = strings.Replace(rootCmd.Use, "tiproxyctl", os.Args[0], 1)
 	cmd.RunRootCommand(rootCmd)
 }