upgrade to use testfixtures v3 (#11904)

* upgrade to use testfixtures v3

* simplify logic

* make vendor

* update per @lunny

* Update templates/repo/empty.tmpl

* Update templates/repo/empty.tmpl

Co-authored-by: Lauris BH <lauris@nix.lv>

vendor/github.com/go-testfixtures/testfixtures/v3/sqlite.go

@@ -0,0 +1,75 @@
+package testfixtures
+
+import (
+	"database/sql"
+	"path/filepath"
+)
+
+type sqlite struct {
+	baseHelper
+}
+
+func (*sqlite) paramType() int {
+	return paramTypeQuestion
+}
+
+func (*sqlite) databaseName(q queryable) (string, error) {
+	var seq int
+	var main, dbName string
+	err := q.QueryRow("PRAGMA database_list").Scan(&seq, &main, &dbName)
+	if err != nil {
+		return "", err
+	}
+	dbName = filepath.Base(dbName)
+	return dbName, nil
+}
+
+func (*sqlite) tableNames(q queryable) ([]string, error) {
+	query := `
+		SELECT name
+		FROM sqlite_master
+		WHERE type = 'table';
+	`
+	rows, err := q.Query(query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var tables []string
+	for rows.Next() {
+		var table string
+		if err = rows.Scan(&table); err != nil {
+			return nil, err
+		}
+		tables = append(tables, table)
+	}
+	if err = rows.Err(); err != nil {
+		return nil, err
+	}
+	return tables, nil
+}
+
+func (*sqlite) disableReferentialIntegrity(db *sql.DB, loadFn loadFunction) (err error) {
+	defer func() {
+		if _, err2 := db.Exec("PRAGMA defer_foreign_keys = OFF"); err2 != nil && err == nil {
+			err = err2
+		}
+	}()
+
+	if _, err = db.Exec("PRAGMA defer_foreign_keys = ON"); err != nil {
+		return err
+	}
+
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	if err = loadFn(tx); err != nil {
+		return err
+	}
+
+	return tx.Commit()
+}