Split migrations folder (#21549)

There are too many files in `models/migrations` folder so that I split
them into sub folders.

6 files changed, 1117 insertions, 0 deletions

diff --git a/models/migrations/base/db.go b/models/migrations/base/db.go
new file mode 100644
index 0000000000..5466b76220
--- /dev/null
+++ b/models/migrations/base/db.go
@@ -0,0 +1,634 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package base
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"os"
+	"path"
+	"reflect"
+	"regexp"
+	"strings"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/util"
+
+	"xorm.io/xorm"
+	"xorm.io/xorm/schemas"
+)
+
+// RecreateTables will recreate the tables for the provided beans using the newly provided bean definition and move all data to that new table
+// WARNING: YOU MUST PROVIDE THE FULL BEAN DEFINITION
+func RecreateTables(beans ...interface{}) func(*xorm.Engine) error {
+	return func(x *xorm.Engine) error {
+		sess := x.NewSession()
+		defer sess.Close()
+		if err := sess.Begin(); err != nil {
+			return err
+		}
+		sess = sess.StoreEngine("InnoDB")
+		for _, bean := range beans {
+			log.Info("Recreating Table: %s for Bean: %s", x.TableName(bean), reflect.Indirect(reflect.ValueOf(bean)).Type().Name())
+			if err := RecreateTable(sess, bean); err != nil {
+				return err
+			}
+		}
+		return sess.Commit()
+	}
+}
+
+// RecreateTable will recreate the table using the newly provided bean definition and move all data to that new table
+// WARNING: YOU MUST PROVIDE THE FULL BEAN DEFINITION
+// WARNING: YOU MUST COMMIT THE SESSION AT THE END
+func RecreateTable(sess *xorm.Session, bean interface{}) error {
+	// TODO: This will not work if there are foreign keys
+
+	tableName := sess.Engine().TableName(bean)
+	tempTableName := fmt.Sprintf("tmp_recreate__%s", tableName)
+
+	// We need to move the old table away and create a new one with the correct columns
+	// We will need to do this in stages to prevent data loss
+	//
+	// First create the temporary table
+	if err := sess.Table(tempTableName).CreateTable(bean); err != nil {
+		log.Error("Unable to create table %s. Error: %v", tempTableName, err)
+		return err
+	}
+
+	if err := sess.Table(tempTableName).CreateUniques(bean); err != nil {
+		log.Error("Unable to create uniques for table %s. Error: %v", tempTableName, err)
+		return err
+	}
+
+	if err := sess.Table(tempTableName).CreateIndexes(bean); err != nil {
+		log.Error("Unable to create indexes for table %s. Error: %v", tempTableName, err)
+		return err
+	}
+
+	// Work out the column names from the bean - these are the columns to select from the old table and install into the new table
+	table, err := sess.Engine().TableInfo(bean)
+	if err != nil {
+		log.Error("Unable to get table info. Error: %v", err)
+
+		return err
+	}
+	newTableColumns := table.Columns()
+	if len(newTableColumns) == 0 {
+		return fmt.Errorf("no columns in new table")
+	}
+	hasID := false
+	for _, column := range newTableColumns {
+		hasID = hasID || (column.IsPrimaryKey && column.IsAutoIncrement)
+	}
+
+	if hasID && setting.Database.UseMSSQL {
+		if _, err := sess.Exec(fmt.Sprintf("SET IDENTITY_INSERT `%s` ON", tempTableName)); err != nil {
+			log.Error("Unable to set identity insert for table %s. Error: %v", tempTableName, err)
+			return err
+		}
+	}
+
+	sqlStringBuilder := &strings.Builder{}
+	_, _ = sqlStringBuilder.WriteString("INSERT INTO `")
+	_, _ = sqlStringBuilder.WriteString(tempTableName)
+	_, _ = sqlStringBuilder.WriteString("` (`")
+	_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Name)
+	_, _ = sqlStringBuilder.WriteString("`")
+	for _, column := range newTableColumns[1:] {
+		_, _ = sqlStringBuilder.WriteString(", `")
+		_, _ = sqlStringBuilder.WriteString(column.Name)
+		_, _ = sqlStringBuilder.WriteString("`")
+	}
+	_, _ = sqlStringBuilder.WriteString(")")
+	_, _ = sqlStringBuilder.WriteString(" SELECT ")
+	if newTableColumns[0].Default != "" {
+		_, _ = sqlStringBuilder.WriteString("COALESCE(`")
+		_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Name)
+		_, _ = sqlStringBuilder.WriteString("`, ")
+		_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Default)
+		_, _ = sqlStringBuilder.WriteString(")")
+	} else {
+		_, _ = sqlStringBuilder.WriteString("`")
+		_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Name)
+		_, _ = sqlStringBuilder.WriteString("`")
+	}
+
+	for _, column := range newTableColumns[1:] {
+		if column.Default != "" {
+			_, _ = sqlStringBuilder.WriteString(", COALESCE(`")
+			_, _ = sqlStringBuilder.WriteString(column.Name)
+			_, _ = sqlStringBuilder.WriteString("`, ")
+			_, _ = sqlStringBuilder.WriteString(column.Default)
+			_, _ = sqlStringBuilder.WriteString(")")
+		} else {
+			_, _ = sqlStringBuilder.WriteString(", `")
+			_, _ = sqlStringBuilder.WriteString(column.Name)
+			_, _ = sqlStringBuilder.WriteString("`")
+		}
+	}
+	_, _ = sqlStringBuilder.WriteString(" FROM `")
+	_, _ = sqlStringBuilder.WriteString(tableName)
+	_, _ = sqlStringBuilder.WriteString("`")
+
+	if _, err := sess.Exec(sqlStringBuilder.String()); err != nil {
+		log.Error("Unable to set copy data in to temp table %s. Error: %v", tempTableName, err)
+		return err
+	}
+
+	if hasID && setting.Database.UseMSSQL {
+		if _, err := sess.Exec(fmt.Sprintf("SET IDENTITY_INSERT `%s` OFF", tempTableName)); err != nil {
+			log.Error("Unable to switch off identity insert for table %s. Error: %v", tempTableName, err)
+			return err
+		}
+	}
+
+	switch {
+	case setting.Database.UseSQLite3:
+		// SQLite will drop all the constraints on the old table
+		if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
+			log.Error("Unable to drop old table %s. Error: %v", tableName, err)
+			return err
+		}
+
+		if err := sess.Table(tempTableName).DropIndexes(bean); err != nil {
+			log.Error("Unable to drop indexes on temporary table %s. Error: %v", tempTableName, err)
+			return err
+		}
+
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`", tempTableName, tableName)); err != nil {
+			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
+			return err
+		}
+
+		if err := sess.Table(tableName).CreateIndexes(bean); err != nil {
+			log.Error("Unable to recreate indexes on table %s. Error: %v", tableName, err)
+			return err
+		}
+
+		if err := sess.Table(tableName).CreateUniques(bean); err != nil {
+			log.Error("Unable to recreate uniques on table %s. Error: %v", tableName, err)
+			return err
+		}
+
+	case setting.Database.UseMySQL:
+		// MySQL will drop all the constraints on the old table
+		if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
+			log.Error("Unable to drop old table %s. Error: %v", tableName, err)
+			return err
+		}
+
+		if err := sess.Table(tempTableName).DropIndexes(bean); err != nil {
+			log.Error("Unable to drop indexes on temporary table %s. Error: %v", tempTableName, err)
+			return err
+		}
+
+		// SQLite and MySQL will move all the constraints from the temporary table to the new table
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`", tempTableName, tableName)); err != nil {
+			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
+			return err
+		}
+
+		if err := sess.Table(tableName).CreateIndexes(bean); err != nil {
+			log.Error("Unable to recreate indexes on table %s. Error: %v", tableName, err)
+			return err
+		}
+
+		if err := sess.Table(tableName).CreateUniques(bean); err != nil {
+			log.Error("Unable to recreate uniques on table %s. Error: %v", tableName, err)
+			return err
+		}
+	case setting.Database.UsePostgreSQL:
+		var originalSequences []string
+		type sequenceData struct {
+			LastValue int  `xorm:"'last_value'"`
+			IsCalled  bool `xorm:"'is_called'"`
+		}
+		sequenceMap := map[string]sequenceData{}
+
+		schema := sess.Engine().Dialect().URI().Schema
+		sess.Engine().SetSchema("")
+		if err := sess.Table("information_schema.sequences").Cols("sequence_name").Where("sequence_name LIKE ? || '_%' AND sequence_catalog = ?", tableName, setting.Database.Name).Find(&originalSequences); err != nil {
+			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
+			return err
+		}
+		sess.Engine().SetSchema(schema)
+
+		for _, sequence := range originalSequences {
+			sequenceData := sequenceData{}
+			if _, err := sess.Table(sequence).Cols("last_value", "is_called").Get(&sequenceData); err != nil {
+				log.Error("Unable to get last_value and is_called from %s. Error: %v", sequence, err)
+				return err
+			}
+			sequenceMap[sequence] = sequenceData
+
+		}
+
+		// CASCADE causes postgres to drop all the constraints on the old table
+		if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s` CASCADE", tableName)); err != nil {
+			log.Error("Unable to drop old table %s. Error: %v", tableName, err)
+			return err
+		}
+
+		// CASCADE causes postgres to move all the constraints from the temporary table to the new table
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`", tempTableName, tableName)); err != nil {
+			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
+			return err
+		}
+
+		var indices []string
+		sess.Engine().SetSchema("")
+		if err := sess.Table("pg_indexes").Cols("indexname").Where("tablename = ? ", tableName).Find(&indices); err != nil {
+			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
+			return err
+		}
+		sess.Engine().SetSchema(schema)
+
+		for _, index := range indices {
+			newIndexName := strings.Replace(index, "tmp_recreate__", "", 1)
+			if _, err := sess.Exec(fmt.Sprintf("ALTER INDEX `%s` RENAME TO `%s`", index, newIndexName)); err != nil {
+				log.Error("Unable to rename %s to %s. Error: %v", index, newIndexName, err)
+				return err
+			}
+		}
+
+		var sequences []string
+		sess.Engine().SetSchema("")
+		if err := sess.Table("information_schema.sequences").Cols("sequence_name").Where("sequence_name LIKE 'tmp_recreate__' || ? || '_%' AND sequence_catalog = ?", tableName, setting.Database.Name).Find(&sequences); err != nil {
+			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
+			return err
+		}
+		sess.Engine().SetSchema(schema)
+
+		for _, sequence := range sequences {
+			newSequenceName := strings.Replace(sequence, "tmp_recreate__", "", 1)
+			if _, err := sess.Exec(fmt.Sprintf("ALTER SEQUENCE `%s` RENAME TO `%s`", sequence, newSequenceName)); err != nil {
+				log.Error("Unable to rename %s sequence to %s. Error: %v", sequence, newSequenceName, err)
+				return err
+			}
+			val, ok := sequenceMap[newSequenceName]
+			if newSequenceName == tableName+"_id_seq" {
+				if ok && val.LastValue != 0 {
+					if _, err := sess.Exec(fmt.Sprintf("SELECT setval('%s', %d, %t)", newSequenceName, val.LastValue, val.IsCalled)); err != nil {
+						log.Error("Unable to reset %s to %d. Error: %v", newSequenceName, val, err)
+						return err
+					}
+				} else {
+					// We're going to try to guess this
+					if _, err := sess.Exec(fmt.Sprintf("SELECT setval('%s', COALESCE((SELECT MAX(id)+1 FROM `%s`), 1), false)", newSequenceName, tableName)); err != nil {
+						log.Error("Unable to reset %s. Error: %v", newSequenceName, err)
+						return err
+					}
+				}
+			} else if ok {
+				if _, err := sess.Exec(fmt.Sprintf("SELECT setval('%s', %d, %t)", newSequenceName, val.LastValue, val.IsCalled)); err != nil {
+					log.Error("Unable to reset %s to %d. Error: %v", newSequenceName, val, err)
+					return err
+				}
+			}
+
+		}
+
+	case setting.Database.UseMSSQL:
+		// MSSQL will drop all the constraints on the old table
+		if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
+			log.Error("Unable to drop old table %s. Error: %v", tableName, err)
+			return err
+		}
+
+		// MSSQL sp_rename will move all the constraints from the temporary table to the new table
+		if _, err := sess.Exec(fmt.Sprintf("sp_rename `%s`,`%s`", tempTableName, tableName)); err != nil {
+			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
+			return err
+		}
+
+	default:
+		log.Fatal("Unrecognized DB")
+	}
+	return nil
+}
+
+// WARNING: YOU MUST COMMIT THE SESSION AT THE END
+func DropTableColumns(sess *xorm.Session, tableName string, columnNames ...string) (err error) {
+	if tableName == "" || len(columnNames) == 0 {
+		return nil
+	}
+	// TODO: This will not work if there are foreign keys
+
+	switch {
+	case setting.Database.UseSQLite3:
+		// First drop the indexes on the columns
+		res, errIndex := sess.Query(fmt.Sprintf("PRAGMA index_list(`%s`)", tableName))
+		if errIndex != nil {
+			return errIndex
+		}
+		for _, row := range res {
+			indexName := row["name"]
+			indexRes, err := sess.Query(fmt.Sprintf("PRAGMA index_info(`%s`)", indexName))
+			if err != nil {
+				return err
+			}
+			if len(indexRes) != 1 {
+				continue
+			}
+			indexColumn := string(indexRes[0]["name"])
+			for _, name := range columnNames {
+				if name == indexColumn {
+					_, err := sess.Exec(fmt.Sprintf("DROP INDEX `%s`", indexName))
+					if err != nil {
+						return err
+					}
+				}
+			}
+		}
+
+		// Here we need to get the columns from the original table
+		sql := fmt.Sprintf("SELECT sql FROM sqlite_master WHERE tbl_name='%s' and type='table'", tableName)
+		res, err := sess.Query(sql)
+		if err != nil {
+			return err
+		}
+		tableSQL := string(res[0]["sql"])
+
+		// Get the string offset for column definitions: `CREATE TABLE ( column-definitions... )`
+		columnDefinitionsIndex := strings.Index(tableSQL, "(")
+		if columnDefinitionsIndex < 0 {
+			return errors.New("couldn't find column definitions")
+		}
+
+		// Separate out the column definitions
+		tableSQL = tableSQL[columnDefinitionsIndex:]
+
+		// Remove the required columnNames
+		for _, name := range columnNames {
+			tableSQL = regexp.MustCompile(regexp.QuoteMeta("`"+name+"`")+"[^`,)]*?[,)]").ReplaceAllString(tableSQL, "")
+		}
+
+		// Ensure the query is ended properly
+		tableSQL = strings.TrimSpace(tableSQL)
+		if tableSQL[len(tableSQL)-1] != ')' {
+			if tableSQL[len(tableSQL)-1] == ',' {
+				tableSQL = tableSQL[:len(tableSQL)-1]
+			}
+			tableSQL += ")"
+		}
+
+		// Find all the columns in the table
+		columns := regexp.MustCompile("`([^`]*)`").FindAllString(tableSQL, -1)
+
+		tableSQL = fmt.Sprintf("CREATE TABLE `new_%s_new` ", tableName) + tableSQL
+		if _, err := sess.Exec(tableSQL); err != nil {
+			return err
+		}
+
+		// Now restore the data
+		columnsSeparated := strings.Join(columns, ",")
+		insertSQL := fmt.Sprintf("INSERT INTO `new_%s_new` (%s) SELECT %s FROM %s", tableName, columnsSeparated, columnsSeparated, tableName)
+		if _, err := sess.Exec(insertSQL); err != nil {
+			return err
+		}
+
+		// Now drop the old table
+		if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
+			return err
+		}
+
+		// Rename the table
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `new_%s_new` RENAME TO `%s`", tableName, tableName)); err != nil {
+			return err
+		}
+
+	case setting.Database.UsePostgreSQL:
+		cols := ""
+		for _, col := range columnNames {
+			if cols != "" {
+				cols += ", "
+			}
+			cols += "DROP COLUMN `" + col + "` CASCADE"
+		}
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` %s", tableName, cols)); err != nil {
+			return fmt.Errorf("Drop table `%s` columns %v: %v", tableName, columnNames, err)
+		}
+	case setting.Database.UseMySQL:
+		// Drop indexes on columns first
+		sql := fmt.Sprintf("SHOW INDEX FROM %s WHERE column_name IN ('%s')", tableName, strings.Join(columnNames, "','"))
+		res, err := sess.Query(sql)
+		if err != nil {
+			return err
+		}
+		for _, index := range res {
+			indexName := index["column_name"]
+			if len(indexName) > 0 {
+				_, err := sess.Exec(fmt.Sprintf("DROP INDEX `%s` ON `%s`", indexName, tableName))
+				if err != nil {
+					return err
+				}
+			}
+		}
+
+		// Now drop the columns
+		cols := ""
+		for _, col := range columnNames {
+			if cols != "" {
+				cols += ", "
+			}
+			cols += "DROP COLUMN `" + col + "`"
+		}
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` %s", tableName, cols)); err != nil {
+			return fmt.Errorf("Drop table `%s` columns %v: %v", tableName, columnNames, err)
+		}
+	case setting.Database.UseMSSQL:
+		cols := ""
+		for _, col := range columnNames {
+			if cols != "" {
+				cols += ", "
+			}
+			cols += "`" + strings.ToLower(col) + "`"
+		}
+		sql := fmt.Sprintf("SELECT Name FROM sys.default_constraints WHERE parent_object_id = OBJECT_ID('%[1]s') AND parent_column_id IN (SELECT column_id FROM sys.columns WHERE LOWER(name) IN (%[2]s) AND object_id = OBJECT_ID('%[1]s'))",
+			tableName, strings.ReplaceAll(cols, "`", "'"))
+		constraints := make([]string, 0)
+		if err := sess.SQL(sql).Find(&constraints); err != nil {
+			return fmt.Errorf("Find constraints: %v", err)
+		}
+		for _, constraint := range constraints {
+			if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` DROP CONSTRAINT `%s`", tableName, constraint)); err != nil {
+				return fmt.Errorf("Drop table `%s` default constraint `%s`: %v", tableName, constraint, err)
+			}
+		}
+		sql = fmt.Sprintf("SELECT DISTINCT Name FROM sys.indexes INNER JOIN sys.index_columns ON indexes.index_id = index_columns.index_id AND indexes.object_id = index_columns.object_id WHERE indexes.object_id = OBJECT_ID('%[1]s') AND index_columns.column_id IN (SELECT column_id FROM sys.columns WHERE LOWER(name) IN (%[2]s) AND object_id = OBJECT_ID('%[1]s'))",
+			tableName, strings.ReplaceAll(cols, "`", "'"))
+		constraints = make([]string, 0)
+		if err := sess.SQL(sql).Find(&constraints); err != nil {
+			return fmt.Errorf("Find constraints: %v", err)
+		}
+		for _, constraint := range constraints {
+			if _, err := sess.Exec(fmt.Sprintf("DROP INDEX `%[2]s` ON `%[1]s`", tableName, constraint)); err != nil {
+				return fmt.Errorf("Drop index `%[2]s` on `%[1]s`: %v", tableName, constraint, err)
+			}
+		}
+
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` DROP COLUMN %s", tableName, cols)); err != nil {
+			return fmt.Errorf("Drop table `%s` columns %v: %v", tableName, columnNames, err)
+		}
+	default:
+		log.Fatal("Unrecognized DB")
+	}
+
+	return nil
+}
+
+// ModifyColumn will modify column's type or other property. SQLITE is not supported
+func ModifyColumn(x *xorm.Engine, tableName string, col *schemas.Column) error {
+	var indexes map[string]*schemas.Index
+	var err error
+	// MSSQL have to remove index at first, otherwise alter column will fail
+	// ref. https://sqlzealots.com/2018/05/09/error-message-the-index-is-dependent-on-column-alter-table-alter-column-failed-because-one-or-more-objects-access-this-column/
+	if x.Dialect().URI().DBType == schemas.MSSQL {
+		indexes, err = x.Dialect().GetIndexes(x.DB(), context.Background(), tableName)
+		if err != nil {
+			return err
+		}
+
+		for _, index := range indexes {
+			_, err = x.Exec(x.Dialect().DropIndexSQL(tableName, index))
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	defer func() {
+		for _, index := range indexes {
+			_, err = x.Exec(x.Dialect().CreateIndexSQL(tableName, index))
+			if err != nil {
+				log.Error("Create index %s on table %s failed: %v", index.Name, tableName, err)
+			}
+		}
+	}()
+
+	alterSQL := x.Dialect().ModifyColumnSQL(tableName, col)
+	if _, err := x.Exec(alterSQL); err != nil {
+		return err
+	}
+	return nil
+}
+
+func removeAllWithRetry(dir string) error {
+	var err error
+	for i := 0; i < 20; i++ {
+		err = os.RemoveAll(dir)
+		if err == nil {
+			break
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+	return err
+}
+
+func newXORMEngine() (*xorm.Engine, error) {
+	if err := db.InitEngine(context.Background()); err != nil {
+		return nil, err
+	}
+	x := unittest.GetXORMEngine()
+	return x, nil
+}
+
+func deleteDB() error {
+	switch {
+	case setting.Database.UseSQLite3:
+		if err := util.Remove(setting.Database.Path); err != nil {
+			return err
+		}
+		return os.MkdirAll(path.Dir(setting.Database.Path), os.ModePerm)
+
+	case setting.Database.UseMySQL:
+		db, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s)/",
+			setting.Database.User, setting.Database.Passwd, setting.Database.Host))
+		if err != nil {
+			return err
+		}
+		defer db.Close()
+
+		if _, err = db.Exec(fmt.Sprintf("DROP DATABASE IF EXISTS %s", setting.Database.Name)); err != nil {
+			return err
+		}
+
+		if _, err = db.Exec(fmt.Sprintf("CREATE DATABASE IF NOT EXISTS %s", setting.Database.Name)); err != nil {
+			return err
+		}
+		return nil
+	case setting.Database.UsePostgreSQL:
+		db, err := sql.Open("postgres", fmt.Sprintf("postgres://%s:%s@%s/?sslmode=%s",
+			setting.Database.User, setting.Database.Passwd, setting.Database.Host, setting.Database.SSLMode))
+		if err != nil {
+			return err
+		}
+		defer db.Close()
+
+		if _, err = db.Exec(fmt.Sprintf("DROP DATABASE IF EXISTS %s", setting.Database.Name)); err != nil {
+			return err
+		}
+
+		if _, err = db.Exec(fmt.Sprintf("CREATE DATABASE %s", setting.Database.Name)); err != nil {
+			return err
+		}
+		db.Close()
+
+		// Check if we need to setup a specific schema
+		if len(setting.Database.Schema) != 0 {
+			db, err = sql.Open("postgres", fmt.Sprintf("postgres://%s:%s@%s/%s?sslmode=%s",
+				setting.Database.User, setting.Database.Passwd, setting.Database.Host, setting.Database.Name, setting.Database.SSLMode))
+			if err != nil {
+				return err
+			}
+			defer db.Close()
+
+			schrows, err := db.Query(fmt.Sprintf("SELECT 1 FROM information_schema.schemata WHERE schema_name = '%s'", setting.Database.Schema))
+			if err != nil {
+				return err
+			}
+			defer schrows.Close()
+
+			if !schrows.Next() {
+				// Create and setup a DB schema
+				_, err = db.Exec(fmt.Sprintf("CREATE SCHEMA %s", setting.Database.Schema))
+				if err != nil {
+					return err
+				}
+			}
+
+			// Make the user's default search path the created schema; this will affect new connections
+			_, err = db.Exec(fmt.Sprintf(`ALTER USER "%s" SET search_path = %s`, setting.Database.User, setting.Database.Schema))
+			if err != nil {
+				return err
+			}
+			return nil
+		}
+	case setting.Database.UseMSSQL:
+		host, port := setting.ParseMSSQLHostPort(setting.Database.Host)
+		db, err := sql.Open("mssql", fmt.Sprintf("server=%s; port=%s; database=%s; user id=%s; password=%s;",
+			host, port, "master", setting.Database.User, setting.Database.Passwd))
+		if err != nil {
+			return err
+		}
+		defer db.Close()
+
+		if _, err = db.Exec(fmt.Sprintf("DROP DATABASE IF EXISTS [%s]", setting.Database.Name)); err != nil {
+			return err
+		}
+		if _, err = db.Exec(fmt.Sprintf("CREATE DATABASE [%s]", setting.Database.Name)); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
diff --git a/models/migrations/base/db_test.go b/models/migrations/base/db_test.go
new file mode 100644
index 0000000000..ee227b7978
--- /dev/null
+++ b/models/migrations/base/db_test.go
@@ -0,0 +1,97 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package base
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/xorm/names"
+)
+
+func Test_DropTableColumns(t *testing.T) {
+	x, deferable := PrepareTestEnv(t, 0)
+	if x == nil || t.Failed() {
+		defer deferable()
+		return
+	}
+	defer deferable()
+
+	type DropTest struct {
+		ID            int64 `xorm:"pk autoincr"`
+		FirstColumn   string
+		ToDropColumn  string `xorm:"unique"`
+		AnotherColumn int64
+		CreatedUnix   timeutil.TimeStamp `xorm:"INDEX created"`
+		UpdatedUnix   timeutil.TimeStamp `xorm:"INDEX updated"`
+	}
+
+	columns := []string{
+		"first_column",
+		"to_drop_column",
+		"another_column",
+		"created_unix",
+		"updated_unix",
+	}
+
+	for i := range columns {
+		x.SetMapper(names.GonicMapper{})
+		if err := x.Sync2(new(DropTest)); err != nil {
+			t.Errorf("unable to create DropTest table: %v", err)
+			return
+		}
+		sess := x.NewSession()
+		if err := sess.Begin(); err != nil {
+			sess.Close()
+			t.Errorf("unable to begin transaction: %v", err)
+			return
+		}
+		if err := DropTableColumns(sess, "drop_test", columns[i:]...); err != nil {
+			sess.Close()
+			t.Errorf("Unable to drop columns[%d:]: %s from drop_test: %v", i, columns[i:], err)
+			return
+		}
+		if err := sess.Commit(); err != nil {
+			sess.Close()
+			t.Errorf("unable to commit transaction: %v", err)
+			return
+		}
+		sess.Close()
+		if err := x.DropTables(new(DropTest)); err != nil {
+			t.Errorf("unable to drop table: %v", err)
+			return
+		}
+		for j := range columns[i+1:] {
+			x.SetMapper(names.GonicMapper{})
+			if err := x.Sync2(new(DropTest)); err != nil {
+				t.Errorf("unable to create DropTest table: %v", err)
+				return
+			}
+			dropcols := append([]string{columns[i]}, columns[j+i+1:]...)
+			sess := x.NewSession()
+			if err := sess.Begin(); err != nil {
+				sess.Close()
+				t.Errorf("unable to begin transaction: %v", err)
+				return
+			}
+			if err := DropTableColumns(sess, "drop_test", dropcols...); err != nil {
+				sess.Close()
+				t.Errorf("Unable to drop columns: %s from drop_test: %v", dropcols, err)
+				return
+			}
+			if err := sess.Commit(); err != nil {
+				sess.Close()
+				t.Errorf("unable to commit transaction: %v", err)
+				return
+			}
+			sess.Close()
+			if err := x.DropTables(new(DropTest)); err != nil {
+				t.Errorf("unable to drop table: %v", err)
+				return
+			}
+		}
+	}
+}
diff --git a/models/migrations/base/hash.go b/models/migrations/base/hash.go
new file mode 100644
index 0000000000..0f078dd70f
--- /dev/null
+++ b/models/migrations/base/hash.go
@@ -0,0 +1,17 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package base
+
+import (
+	"crypto/sha256"
+	"fmt"
+
+	"golang.org/x/crypto/pbkdf2"
+)
+
+func HashToken(token, salt string) string {
+	tempHash := pbkdf2.Key([]byte(token), []byte(salt), 10000, 50, sha256.New)
+	return fmt.Sprintf("%x", tempHash)
+}
diff --git a/models/migrations/base/main_test.go b/models/migrations/base/main_test.go
new file mode 100644
index 0000000000..290d87214a
--- /dev/null
+++ b/models/migrations/base/main_test.go
@@ -0,0 +1,13 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package base
+
+import (
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	MainTest(m)
+}
diff --git a/models/migrations/base/testlogger.go b/models/migrations/base/testlogger.go
new file mode 100644
index 0000000000..0f35a078ec
--- /dev/null
+++ b/models/migrations/base/testlogger.go
@@ -0,0 +1,186 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package base
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"runtime"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/queue"
+)
+
+var (
+	prefix    string
+	slowTest  = 10 * time.Second
+	slowFlush = 5 * time.Second
+)
+
+// TestLogger is a logger which will write to the testing log
+type TestLogger struct {
+	log.WriterLogger
+}
+
+var writerCloser = &testLoggerWriterCloser{}
+
+type testLoggerWriterCloser struct {
+	sync.RWMutex
+	t []*testing.TB
+}
+
+func (w *testLoggerWriterCloser) setT(t *testing.TB) {
+	w.Lock()
+	w.t = append(w.t, t)
+	w.Unlock()
+}
+
+func (w *testLoggerWriterCloser) Write(p []byte) (int, error) {
+	w.RLock()
+	var t *testing.TB
+	if len(w.t) > 0 {
+		t = w.t[len(w.t)-1]
+	}
+	w.RUnlock()
+	if t != nil && *t != nil {
+		if len(p) > 0 && p[len(p)-1] == '\n' {
+			p = p[:len(p)-1]
+		}
+
+		defer func() {
+			err := recover()
+			if err == nil {
+				return
+			}
+			var errString string
+			errErr, ok := err.(error)
+			if ok {
+				errString = errErr.Error()
+			} else {
+				errString, ok = err.(string)
+			}
+			if !ok {
+				panic(err)
+			}
+			if !strings.HasPrefix(errString, "Log in goroutine after ") {
+				panic(err)
+			}
+		}()
+
+		(*t).Log(string(p))
+		return len(p), nil
+	}
+	return len(p), nil
+}
+
+func (w *testLoggerWriterCloser) Close() error {
+	w.Lock()
+	if len(w.t) > 0 {
+		w.t = w.t[:len(w.t)-1]
+	}
+	w.Unlock()
+	return nil
+}
+
+// PrintCurrentTest prints the current test to os.Stdout
+func PrintCurrentTest(t testing.TB, skip ...int) func() {
+	start := time.Now()
+	actualSkip := 1
+	if len(skip) > 0 {
+		actualSkip = skip[0]
+	}
+	_, filename, line, _ := runtime.Caller(actualSkip)
+
+	if log.CanColorStdout {
+		fmt.Fprintf(os.Stdout, "=== %s (%s:%d)\n", fmt.Formatter(log.NewColoredValue(t.Name())), strings.TrimPrefix(filename, prefix), line)
+	} else {
+		fmt.Fprintf(os.Stdout, "=== %s (%s:%d)\n", t.Name(), strings.TrimPrefix(filename, prefix), line)
+	}
+	writerCloser.setT(&t)
+	return func() {
+		took := time.Since(start)
+		if took > slowTest {
+			if log.CanColorStdout {
+				fmt.Fprintf(os.Stdout, "+++ %s is a slow test (took %v)\n", fmt.Formatter(log.NewColoredValue(t.Name(), log.Bold, log.FgYellow)), fmt.Formatter(log.NewColoredValue(took, log.Bold, log.FgYellow)))
+			} else {
+				fmt.Fprintf(os.Stdout, "+++ %s is a slow test (took %v)\n", t.Name(), took)
+			}
+		}
+		timer := time.AfterFunc(slowFlush, func() {
+			if log.CanColorStdout {
+				fmt.Fprintf(os.Stdout, "+++ %s ... still flushing after %v ...\n", fmt.Formatter(log.NewColoredValue(t.Name(), log.Bold, log.FgRed)), slowFlush)
+			} else {
+				fmt.Fprintf(os.Stdout, "+++ %s ... still flushing after %v ...\n", t.Name(), slowFlush)
+			}
+		})
+		if err := queue.GetManager().FlushAll(context.Background(), -1); err != nil {
+			t.Errorf("Flushing queues failed with error %v", err)
+		}
+		timer.Stop()
+		flushTook := time.Since(start) - took
+		if flushTook > slowFlush {
+			if log.CanColorStdout {
+				fmt.Fprintf(os.Stdout, "+++ %s had a slow clean-up flush (took %v)\n", fmt.Formatter(log.NewColoredValue(t.Name(), log.Bold, log.FgRed)), fmt.Formatter(log.NewColoredValue(flushTook, log.Bold, log.FgRed)))
+			} else {
+				fmt.Fprintf(os.Stdout, "+++ %s had a slow clean-up flush (took %v)\n", t.Name(), flushTook)
+			}
+		}
+		_ = writerCloser.Close()
+	}
+}
+
+// Printf takes a format and args and prints the string to os.Stdout
+func Printf(format string, args ...interface{}) {
+	if log.CanColorStdout {
+		for i := 0; i < len(args); i++ {
+			args[i] = log.NewColoredValue(args[i])
+		}
+	}
+	fmt.Fprintf(os.Stdout, "\t"+format, args...)
+}
+
+// NewTestLogger creates a TestLogger as a log.LoggerProvider
+func NewTestLogger() log.LoggerProvider {
+	logger := &TestLogger{}
+	logger.Colorize = log.CanColorStdout
+	logger.Level = log.TRACE
+	return logger
+}
+
+// Init inits connection writer with json config.
+// json config only need key "level".
+func (log *TestLogger) Init(config string) error {
+	err := json.Unmarshal([]byte(config), log)
+	if err != nil {
+		return err
+	}
+	log.NewWriterLogger(writerCloser)
+	return nil
+}
+
+// Content returns the content accumulated in the content provider
+func (log *TestLogger) Content() (string, error) {
+	return "", fmt.Errorf("not supported")
+}
+
+// Flush when log should be flushed
+func (log *TestLogger) Flush() {
+}
+
+// ReleaseReopen does nothing
+func (log *TestLogger) ReleaseReopen() error {
+	return nil
+}
+
+// GetName returns the default name for this implementation
+func (log *TestLogger) GetName() string {
+	return "test"
+}
diff --git a/models/migrations/base/tests.go b/models/migrations/base/tests.go
new file mode 100644
index 0000000000..dafc0df2f2
--- /dev/null
+++ b/models/migrations/base/tests.go
@@ -0,0 +1,170 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package base
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+	"xorm.io/xorm"
+)
+
+// PrepareTestEnv prepares the test environment and reset the database. The skip parameter should usually be 0.
+// Provide models to be sync'd with the database - in particular any models you expect fixtures to be loaded from.
+//
+// fixtures in `models/migrations/fixtures/<TestName>` will be loaded automatically
+func PrepareTestEnv(t *testing.T, skip int, syncModels ...interface{}) (*xorm.Engine, func()) {
+	t.Helper()
+	ourSkip := 2
+	ourSkip += skip
+	deferFn := PrintCurrentTest(t, ourSkip)
+	assert.NoError(t, os.RemoveAll(setting.RepoRootPath))
+	assert.NoError(t, unittest.CopyDir(path.Join(filepath.Dir(setting.AppPath), "tests/gitea-repositories-meta"), setting.RepoRootPath))
+	ownerDirs, err := os.ReadDir(setting.RepoRootPath)
+	if err != nil {
+		assert.NoError(t, err, "unable to read the new repo root: %v\n", err)
+	}
+	for _, ownerDir := range ownerDirs {
+		if !ownerDir.Type().IsDir() {
+			continue
+		}
+		repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
+		if err != nil {
+			assert.NoError(t, err, "unable to read the new repo root: %v\n", err)
+		}
+		for _, repoDir := range repoDirs {
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0o755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0o755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0o755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0o755)
+		}
+	}
+
+	if err := deleteDB(); err != nil {
+		t.Errorf("unable to reset database: %v", err)
+		return nil, deferFn
+	}
+
+	x, err := newXORMEngine()
+	assert.NoError(t, err)
+	if x != nil {
+		oldDefer := deferFn
+		deferFn = func() {
+			oldDefer()
+			if err := x.Close(); err != nil {
+				t.Errorf("error during close: %v", err)
+			}
+			if err := deleteDB(); err != nil {
+				t.Errorf("unable to reset database: %v", err)
+			}
+		}
+	}
+	if err != nil {
+		return x, deferFn
+	}
+
+	if len(syncModels) > 0 {
+		if err := x.Sync2(syncModels...); err != nil {
+			t.Errorf("error during sync: %v", err)
+			return x, deferFn
+		}
+	}
+
+	fixturesDir := filepath.Join(filepath.Dir(setting.AppPath), "models", "migrations", "fixtures", t.Name())
+
+	if _, err := os.Stat(fixturesDir); err == nil {
+		t.Logf("initializing fixtures from: %s", fixturesDir)
+		if err := unittest.InitFixtures(
+			unittest.FixturesOptions{
+				Dir: fixturesDir,
+			}, x); err != nil {
+			t.Errorf("error whilst initializing fixtures from %s: %v", fixturesDir, err)
+			return x, deferFn
+		}
+		if err := unittest.LoadFixtures(x); err != nil {
+			t.Errorf("error whilst loading fixtures from %s: %v", fixturesDir, err)
+			return x, deferFn
+		}
+	} else if !os.IsNotExist(err) {
+		t.Errorf("unexpected error whilst checking for existence of fixtures: %v", err)
+	} else {
+		t.Logf("no fixtures found in: %s", fixturesDir)
+	}
+
+	return x, deferFn
+}
+
+func MainTest(m *testing.M) {
+	log.Register("test", NewTestLogger)
+	_, filename, _, _ := runtime.Caller(0)
+	prefix = strings.TrimSuffix(filename, "tests/testlogger.go")
+
+	giteaRoot := base.SetupGiteaRoot()
+	if giteaRoot == "" {
+		fmt.Println("Environment variable $GITEA_ROOT not set")
+		os.Exit(1)
+	}
+	giteaBinary := "gitea"
+	if runtime.GOOS == "windows" {
+		giteaBinary += ".exe"
+	}
+	setting.AppPath = path.Join(giteaRoot, giteaBinary)
+	if _, err := os.Stat(setting.AppPath); err != nil {
+		fmt.Printf("Could not find gitea binary at %s\n", setting.AppPath)
+		os.Exit(1)
+	}
+
+	giteaConf := os.Getenv("GITEA_CONF")
+	if giteaConf == "" {
+		giteaConf = path.Join(filepath.Dir(setting.AppPath), "tests/sqlite.ini")
+		fmt.Printf("Environment variable $GITEA_CONF not set - defaulting to %s\n", giteaConf)
+	}
+
+	if !path.IsAbs(giteaConf) {
+		setting.CustomConf = path.Join(giteaRoot, giteaConf)
+	} else {
+		setting.CustomConf = giteaConf
+	}
+
+	tmpDataPath, err := os.MkdirTemp("", "data")
+	if err != nil {
+		fmt.Printf("Unable to create temporary data path %v\n", err)
+		os.Exit(1)
+	}
+
+	setting.AppDataPath = tmpDataPath
+
+	setting.SetCustomPathAndConf("", "", "")
+	setting.LoadForTest()
+	if err = git.InitFull(context.Background()); err != nil {
+		fmt.Printf("Unable to InitFull: %v\n", err)
+		os.Exit(1)
+	}
+	setting.InitDBConfig()
+	setting.NewLogServices(true)
+
+	exitStatus := m.Run()
+
+	if err := removeAllWithRetry(setting.RepoRootPath); err != nil {
+		fmt.Fprintf(os.Stderr, "os.RemoveAll: %v\n", err)
+	}
+	if err := removeAllWithRetry(tmpDataPath); err != nil {
+		fmt.Fprintf(os.Stderr, "os.RemoveAll: %v\n", err)
+	}
+	os.Exit(exitStatus)
+}