Don't allow unsupported database versions without flag

database/upgrades/upgrades.go

@@ -26,6 +26,8 @@ const NumberOfUpgrades = 6
 
 var upgrades [NumberOfUpgrades]upgrade
 
+var UnsupportedDatabaseVersion = fmt.Errorf("unsupported database version")
+
 func getVersion(dialect Dialect, db *sql.DB) (int, error) {
 	_, err := db.Exec("CREATE TABLE IF NOT EXISTS version (version INTEGER)")
 	if err != nil {
@@ -65,6 +67,10 @@ func Run(log log.Logger, dialectName string, db *sql.DB) error {
 		return err
 	}
 
+	if version > NumberOfUpgrades {
+		return UnsupportedDatabaseVersion
+	}
+
 	log.Infofln("Database currently on v%d, latest: v%d", version, NumberOfUpgrades)
 	for i, upgrade := range upgrades[version:] {
 		log.Infofln("Upgrading database to v%d: %s", version+i+1, upgrade.message)

main.go

@@ -25,7 +25,9 @@ import (
 
 	flag "maunium.net/go/mauflag"
 	log "maunium.net/go/maulogger/v2"
+
 	"maunium.net/go/mautrix-appservice"
+	"maunium.net/go/mautrix-whatsapp/database/upgrades"
 
 	"maunium.net/go/mautrix-whatsapp/config"
 	"maunium.net/go/mautrix-whatsapp/database"
@@ -36,6 +38,7 @@ var configPath = flag.MakeFull("c", "config", "The path to your config file.", "
 //var baseConfigPath = flag.MakeFull("b", "base-config", "The path to the example config file.", "example-config.yaml").String()
 var registrationPath = flag.MakeFull("r", "registration", "The path where to save the appservice registration.", "registration.yaml").String()
 var generateRegistration = flag.MakeFull("g", "generate-registration", "Generate registration and quit.", "false").Bool()
+var ignoreUnsupportedDatabase = flag.Make().LongKey("ignore-unsupported-database").Usage("Run even if database is too new").Default("false").Bool()
 var wantHelp, _ = flag.MakeHelpFlag()
 
 func (bridge *Bridge) GenerateRegistration() {
@@ -136,7 +139,7 @@ func (bridge *Bridge) Init() {
 
 	bridge.Log.Debugln("Initializing database")
 	bridge.DB, err = database.New(bridge.Config.AppService.Database.Type, bridge.Config.AppService.Database.URI)
-	if err != nil {
+	if err != nil && (err != upgrades.UnsupportedDatabaseVersion || !*ignoreUnsupportedDatabase) {
 		bridge.Log.Fatalln("Failed to initialize database:", err)
 		os.Exit(14)
 	}