Add version support

bincapz.go

@@ -18,6 +18,7 @@ import (
 	"github.com/chainguard-dev/bincapz/pkg/compile"
 	"github.com/chainguard-dev/bincapz/pkg/profile"
 	"github.com/chainguard-dev/bincapz/pkg/render"
+	"github.com/chainguard-dev/bincapz/pkg/version"
 	"github.com/chainguard-dev/bincapz/rules"
 	thirdparty "github.com/chainguard-dev/bincapz/third_party"
 	"github.com/chainguard-dev/clog"
@@ -50,6 +51,8 @@ func main() {
 	statsFlag := flag.Bool("stats", false, "Show statistics about the scan")
 	thirdPartyFlag := flag.Bool("third-party", true, "Include third-party rules, which may have licensing restrictions")
 	verboseFlag := flag.Bool("verbose", false, "Emit verbose logging messages to stderr")
+  versionFlag := flag.Bool("version", false, "show version information")
+
 	flag.Parse()
 	args := flag.Args()
 
@@ -72,7 +75,7 @@ func main() {
 		}
 	}
 
-	if len(args) == 0 {
+	if len(args) == 0 && !*versionFlag {
 		fmt.Printf("usage: bincapz [flags] <directories>")
 		returnCode = ExitInvalidArgument
 		return
@@ -83,6 +86,15 @@ func main() {
 		logLevel.Set(slog.LevelDebug)
 	}
 
+	if *versionFlag {
+		ver, err := version.Version()
+		if err != nil {
+			fmt.Printf("bincapz unknown version\n")
+		}
+		fmt.Printf("%s\n", ver)
+		os.Exit(0)
+	}
+
 	ctx := clog.WithLogger(context.Background(), log)
 	clog.FromContext(ctx).Info("bincapz starting")
 

pkg/version/version.go

@@ -0,0 +1,41 @@
+package version
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+const (
+	ID string = "0.11.0"
+)
+
+// Check if the build info contains a version.
+func getBinaryVersion() (string, error) {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "", fmt.Errorf("failed to read build info")
+	}
+
+	for _, setting := range buildInfo.Settings {
+		if setting.Key == "main.BuildVersion" {
+			return setting.Value, nil
+		}
+	}
+
+	return "", nil
+}
+
+func Version() (string, error) {
+	var v string
+	var err error
+	// Check for the version in the binary first
+	if v, err = getBinaryVersion(); err != nil {
+		return "bincapz unknown version", err
+	}
+	// If present, return that value
+	// Otherwise, fall back to the contents of the VERSION const
+	if v != "" {
+		return fmt.Sprintf("bincapz %s", v), nil
+	}
+	return fmt.Sprintf("bincapz %s", ID), nil
+}