Fix version lookup (#55)

internal/version/version.go

@@ -1,15 +1,43 @@
 package version
 
+import (
+	"runtime"
+	"runtime/debug"
+)
+
 var (
 	// Name is the name of the binary.
 	Name = "ratchet"
 
 	// Version is the main package version.
-	Version = "unknown"
+	Version = func() string {
+		if info, ok := debug.ReadBuildInfo(); ok {
+			if v := info.Main.Version; v != "" {
+				return v // e.g. "v0.0.1-alpha6.0.20230815191505-8628f8201363"
+			}
+		}
+
+		return "source"
+	}()
 
 	// Commit is the git sha.
-	Commit = "unknown"
+	Commit = func() string {
+		if info, ok := debug.ReadBuildInfo(); ok {
+			for _, setting := range info.Settings {
+				if setting.Key == "vcs.revision" {
+					return setting.Value
+				}
+			}
+		}
+
+		return "HEAD"
+	}()
+
+	// OSArch returns the denormalized operating system and architecture.
+	OSArch = func() string {
+		return runtime.GOOS + "/" + runtime.GOARCH
+	}()
 
 	// HumanVersion is the compiled version.
-	HumanVersion = Name + " v" + Version + " (" + Commit + ")"
+	HumanVersion = Name + " " + Version + " (" + Commit + ", " + OSArch + ")"
 )