Temporary fix major version check for v18

lib/auth/init.go

@@ -389,7 +389,7 @@ func initCluster(ctx context.Context, cfg InitConfig, asrv *Server) error {
 	if err != nil {
 		return trace.Wrap(err)
 	}
-	if err := validateAndUpdateTeleportVersion(ctx, cfg.VersionStorage, teleport.SemVersion, firstStart); err != nil {
+	if err := validateAndUpdateTeleportVersion(ctx, cfg.VersionStorage, teleport.SemVersion); err != nil {
 		return trace.Wrap(err)
 	}
 

lib/auth/version.go

@@ -38,25 +38,13 @@ func validateAndUpdateTeleportVersion(
 	ctx context.Context,
 	storage VersionStorage,
 	currentVersion *semver.Version,
-	firstTimeStart bool,
 ) error {
 	if skip := os.Getenv(skipVersionUpgradeCheckEnv); skip != "" {
 		return nil
 	}
 
 	lastKnownVersion, err := storage.GetTeleportVersion(ctx)
 	if trace.IsNotFound(err) {
-		// When this is not the first start, we have to ensure that previous versions,
-		// introduced before this check, were also verified. Therefore, not having a version
-		// in the database means the last known version is <v17.
-		if !firstTimeStart {
-			return trace.BadParameter("Unsupported upgrade path detected: to %v. "+
-				"Teleport supports direct upgrades to the next major version only.\n "+
-				"For instance, if you have version 15.x.x, you must upgrade to version 16.x.x first. "+
-				"See compatibility guarantees for details: "+
-				"https://goteleport.com/docs/upgrading/overview/#component-compatibility.",
-				currentVersion.String())
-		}
 		if err := storage.WriteTeleportVersion(ctx, currentVersion); err != nil {
 			return trace.Wrap(err)
 		}