Build with version number

.github/workflows/build.yml

@@ -27,6 +27,8 @@ jobs:
               with:
                   name: ntpal-binary-${{ matrix.os }}
                   path: ${{ github.workspace }}/bin/ntpal-${{ matrix.os }}
+              env:
+                  VERSION: ${github.ref/v/}
 
     release:
         runs-on: ubuntu-latest

Makefile

@@ -5,10 +5,10 @@ SHELL := /bin/bash -f
 all: ntpal site
 
 ntpal:
-	go build -o bin/ntpal github.com/AndrewLester/ntpal/cmd/ntpal
+	go build -o bin/ntpal -ldflags "-X main.version=${VERSION}" github.com/AndrewLester/ntpal/cmd/ntpal
 
 site:
-	go build -o bin/site github.com/AndrewLester/ntpal/cmd/site
+	go build -o bin/site -ldflags "-X main.version=${VERSION}" github.com/AndrewLester/ntpal/cmd/site
 
 clean:
 	rm -rf bin

cmd/ntpal/main.go

@@ -11,6 +11,8 @@ import (
 	"github.com/AndrewLester/ntpal/pkg/ntpal"
 )
 
+var version string // This is set by the linker
+
 const defaultConfigPath = "/etc/ntp.conf"
 const defaultDriftPath = "/etc/ntp.drift"
 
@@ -22,15 +24,23 @@ func main() {
 	var query string
 	var noDaemon bool
 	var stop bool
+	var isVersion bool
 	flag.StringVar(&config, "config", defaultConfigPath, "Path to the NTP config file.")
 	flag.StringVar(&drift, "drift", defaultDriftPath, "Path to the NTP drift file.")
 	flag.StringVar(&query, "query", "", "Address to query.")
 	flag.StringVar(&query, "q", query, "Address to query.")
 	flag.BoolVar(&noDaemon, "no-daemon", false, "Don't run ntpal as a daemon.")
 	flag.BoolVar(&stop, "stop", false, "Stop the ntpal daemon.")
 	flag.BoolVar(&stop, "s", stop, "Stop the ntpal daemon.")
+	flag.BoolVar(&isVersion, "version", false, "Check the NTPal version.")
+	flag.BoolVar(&isVersion, "v", isVersion, "Check the NTPal version.")
 	flag.Parse()
 
+	if isVersion {
+		fmt.Println("NTPal", version)
+		return
+	}
+
 	port := os.Getenv("NTP_PORT")
 	if port == "" {
 		if query != "" {

cmd/site/main.go

@@ -13,6 +13,8 @@ import (
 	"github.com/AndrewLester/ntpal/pkg/ntpal"
 )
 
+var version string // This is set by the linker
+
 type SyncRequest struct {
 	Orig string
 }
@@ -29,7 +31,8 @@ func main() {
 
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		data := map[string]string{
-			"Region": strings.ToUpper(os.Getenv("FLY_REGION")),
+			"Region":  strings.ToUpper(os.Getenv("FLY_REGION")),
+			"Version": version,
 		}
 
 		// Set these headers to bump performance.now() precision to 5 microseconds

internal/templates/templates/index.tmpl.html

@@ -264,7 +264,9 @@ <h2>According to this server,</h2>
         {{ if .Region }}
         <p class="region">
             Server hosted in the {{.Region}} region, running
-            <a href="https://github.com/AndrewLester/NTPal">NTPal</a>.
+            <a href="https://github.com/AndrewLester/NTPal">
+                NTPal {{ if .Version }} {{.Version}} {{ end }} </a
+            >.
         </p>
         {{ end }}