add displaying version number

.dockerignore

@@ -1,5 +1,5 @@
 .github
-.git
 .vscode
 build
-testing
+dist
+testing

.gitignore

@@ -1,3 +1,4 @@
+dist
 build
 testing
-sample-config.yaml
+sample-config.yaml

.goreleaser.yaml

@@ -7,6 +7,9 @@ builds:
     env:
       - CGO_ENABLED=0
 
+    ldflags:
+      - "-s -w -X main.version={{.Tag}}"
+
     # GOOS list to build for.
     # For more info refer to: https://golang.org/doc/install/source#environment
     goos:

Dockerfile

@@ -9,7 +9,7 @@ RUN go mod download
 
 COPY ./ ./
 
-RUN go build -o /redirector src/main.go
+RUN go build --ldflags '-s -w -X main.version=$(git describe --tags)' -o /redirector src/main.go
 
 
 # Deploy stage

src/commands/start.go

@@ -10,6 +10,7 @@ import (
 	"github.com/AmrSaber/redirector/src/config"
 	"github.com/AmrSaber/redirector/src/lib/logger"
 	"github.com/AmrSaber/redirector/src/servers"
+	"github.com/AmrSaber/redirector/src/utils"
 	"github.com/urfave/cli/v2"
 )
 
@@ -37,6 +38,8 @@ var StartCommand = &cli.Command{
 		},
 	},
 	Action: func(c *cli.Context) error {
+		logger.Std.Printf("Starting redirector %s\n", utils.GetVersion())
+
 		// Runtime context
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()

src/commands/version.go

@@ -0,0 +1,20 @@
+package commands
+
+import (
+	"github.com/AmrSaber/redirector/src/lib/logger"
+	"github.com/AmrSaber/redirector/src/utils"
+	"github.com/urfave/cli/v2"
+)
+
+var VersionCommand = &cli.Command{
+	Name:  "version",
+	Usage: "print redirector version",
+	Action: func(c *cli.Context) error {
+		logger.ResetLoggersFlags()
+
+		version := utils.GetVersion()
+		logger.Std.Println(version)
+
+		return nil
+	},
+}

src/main.go

@@ -5,10 +5,16 @@ import (
 
 	"github.com/AmrSaber/redirector/src/commands"
 	"github.com/AmrSaber/redirector/src/lib/logger"
+	"github.com/AmrSaber/redirector/src/utils"
 	"github.com/urfave/cli/v2"
 )
 
+var version string
+
 func main() {
+	// Set version number if it's loaded
+	utils.SetVersion(version)
+
 	app := &cli.App{
 		Name:  "redirector",
 		Usage: "Redirects requests to different servers",
@@ -17,6 +23,7 @@ func main() {
 			commands.StartCommand,
 			commands.PingCommand,
 			commands.StopCommand,
+			commands.VersionCommand,
 		},
 	}
 

src/utils/version.go

@@ -0,0 +1,48 @@
+package utils
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+)
+
+var version string
+
+func SetVersion(v string) {
+	version = v
+}
+
+func GetVersion() string {
+	if version != "" {
+		return version
+	}
+
+	gitVersion := getVersionFromGit()
+	if gitVersion != "" {
+		return gitVersion
+	}
+
+	return "??"
+}
+
+func getVersionFromGit() string {
+	if _, err := os.Stat(".git"); err != nil {
+		return ""
+	}
+
+	lastTag, err := exec.Command("git", "describe", "--tags", "--abbrev=0").Output()
+	if err != nil {
+		return ""
+	}
+
+	lastTag = bytes.TrimSpace(lastTag)
+
+	tagCommitHash, _ := exec.Command("git", "show", string(lastTag), `--pretty=format:"%h"`, "--no-patch").Output()
+	lastCommitHash, _ := exec.Command("git", "show", `--pretty=format:"%h"`, "--no-patch").Output()
+
+	if !bytes.Equal(tagCommitHash, lastCommitHash) {
+		lastTag = append(lastTag, '+')
+	}
+
+	return string(lastTag)
+}