dialect/sql/schema: option to enable atlas sum file (#2470)

* dialect/sql/schema: option to enable atlas checksum file

* entc/integration/migrate: add integration tests for versioned migrations

* entc/integration/migrate: apply CR

dialect/sql/schema/atlas.go

@@ -264,6 +264,13 @@ func WithFormatter(fmt migrate.Formatter) MigrateOption {
 	}
 }
 
+// WithSumFile instructs atlas to generate a migration directory integrity sum file as well.
+func WithSumFile() MigrateOption {
+	return func(m *Migrate) {
+		m.atlas.genSum = true
+	}
+}
+
 type (
 	// atlasOptions describes the options for atlas.
 	atlasOptions struct {
@@ -273,6 +280,7 @@ type (
 		skip    ChangeKind
 		dir     migrate.Dir
 		fmt     migrate.Formatter
+		genSum  bool
 	}
 
 	// atBuilder must be implemented by the different drivers in

dialect/sql/schema/migrate.go

@@ -186,7 +186,9 @@ func (m *Migrate) NamedDiff(ctx context.Context, name string, tables ...*Table)
 	}
 	opts := []migrate.PlannerOption{
 		migrate.WithFormatter(m.atlas.fmt),
-		migrate.DisableChecksum(),
+	}
+	if !m.atlas.genSum {
+		opts = append(opts, migrate.DisableChecksum())
 	}
 	return migrate.NewPlanner(nil, m.atlas.dir, opts...).WritePlan(plan)
 }