ci: add version flag

.github/workflows/build.yml

@@ -15,6 +15,12 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+
+      - name: Inject slug/short variables
+        uses: rlespinasse/github-slug-action@v4
+        with:
+          short-length: 8 # Same as v3 and before
+
       - name: Setup Go ${{ matrix.go-version }}
         uses: actions/setup-go@v5
         with:
@@ -27,7 +33,7 @@ jobs:
         run: go get .
       - name: Build
         run: |
-          GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} go build -o turbostat-exporter-${{ matrix.goos }}-${{ matrix.goarch }}
+          GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} go build -ldflags="-X 'main.Version=${{ env.GITHUB_REF_SLUG }}'" -o turbostat-exporter-${{ matrix.goos }}-${{ matrix.goarch }}
           chmod +x turbostat-exporter-${{ matrix.goos }}-${{ matrix.goarch }}
       # - name: Archive binaries
       #   uses: actions/upload-artifact@v4

main.go

@@ -5,19 +5,19 @@ import (
 	"crypto/sha256"
 	"crypto/subtle"
 	"encoding/csv"
+	"flag"
 	"fmt"
 	"io"
 	"maps"
 	"math"
+	"net/http"
 	"os"
 	"os/exec"
 	"slices"
 	"strconv"
 	"strings"
 	"time"
 
-	"net/http"
-
 	"github.com/joho/godotenv"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -481,6 +481,7 @@ func basicAuth(next http.HandlerFunc) http.HandlerFunc {
 	})
 }
 
+var Version = "development"
 var listOfMetrics []metricMapping = nil
 var defaultSleepTimer = 5
 var isCommandCat = false
@@ -572,8 +573,20 @@ func parseConfiguration() {
 }
 
 func main() {
+	flagVersion := flag.Bool("version", false, "prints the version")
+
+	flag.Parse()
+
+	if *flagVersion {
+		fmt.Println(Version)
+		os.Exit(0)
+	}
+
 	zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	startServer()
+}
 
+func startServer() {
 	fmt.Println("Prometheus turbostat exporter - created by BlackDark (https://github.com/BlackDark/prometheus_turbotstat_exporter)")
 	parseConfiguration()