channeldb/db: adds optional dry-run abort for migrations

channeldb/options.go

@@ -31,6 +31,10 @@ type Options struct {
 
 	// clock is the time source used by the database.
 	clock clock.Clock
+
+	// dryRun will fail to commit a successful migration when opening the
+	// database if set to true.
+	dryRun bool
 }
 
 // DefaultOptions returns an Options populated with default values.
@@ -73,3 +77,11 @@ func OptionClock(clock clock.Clock) OptionModifier {
 		o.clock = clock
 	}
 }
+
+// OptionDryRunMigration controls whether or not to intentially fail to commit a
+// successful migration that occurs when opening the database.
+func OptionDryRunMigration(dryRun bool) OptionModifier {
+	return func(o *Options) {
+		o.dryRun = dryRun
+	}
+}