Only set video algorithm after migration 12 (#2946)

pkg/sqlite/migrations/12_postmigrate.go

@@ -0,0 +1,60 @@
+package migrations
+
+import (
+	"context"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/stashapp/stash/internal/manager/config"
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+	"github.com/stashapp/stash/pkg/sqlite"
+)
+
+func post12(ctx context.Context, db *sqlx.DB) error {
+	m := schema12Migrator{
+		migrator: migrator{
+			db: db,
+		},
+	}
+
+	return m.migrateConfig(ctx)
+}
+
+type schema12Migrator struct {
+	migrator
+}
+
+func (m *schema12Migrator) migrateConfig(ctx context.Context) error {
+	// if there are no scene files in the database, then default the
+	// VideoFileNamingAlgorithm config setting to oshash and calculateMD5 to
+	// false, otherwise set them to true for backwards compatibility purposes
+	var count int
+	if err := m.withTxn(ctx, func(tx *sqlx.Tx) error {
+		query := "SELECT COUNT(*) from `scenes`"
+
+		return tx.Get(&count, query)
+	}); err != nil {
+		return err
+	}
+
+	usingMD5 := count != 0
+	defaultAlgorithm := models.HashAlgorithmOshash
+	if usingMD5 {
+		logger.Infof("Defaulting video file naming algorithm to %s", models.HashAlgorithmMd5)
+		defaultAlgorithm = models.HashAlgorithmMd5
+	}
+
+	c := config.GetInstance()
+
+	c.SetDefault(config.VideoFileNamingAlgorithm, defaultAlgorithm)
+	c.SetDefault(config.CalculateMD5, usingMD5)
+	if err := c.Write(); err != nil {
+		logger.Errorf("Error while writing configuration file: %s", err.Error())
+	}
+
+	return nil
+}
+
+func init() {
+	sqlite.RegisterPostMigration(12, post12)
+}