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gitea/models/migrations/v175.go
zeripath 070c57867d
Fix postgres ID sequences broken by recreate-table (#15015)
* Fix postgres ID sequences broken by recreate-table

Unfortunately there is a subtle problem with recreatetable on postgres which
leads to the sequences not being renamed and not being left at 0.

Fix #14725

Signed-off-by: Andrew Thornton <art27@cantab.net>

* let us try information_schema instead

Signed-off-by: Andrew Thornton <art27@cantab.net>

* try again

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>
2021-03-18 02:06:40 -04:00

54 lines
1.6 KiB
Go

// 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 migrations
import (
"fmt"
"regexp"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"xorm.io/xorm"
)
func fixPostgresIDSequences(x *xorm.Engine) error {
if !setting.Database.UsePostgreSQL {
return nil
}
sess := x.NewSession()
defer sess.Close()
if err := sess.Begin(); err != nil {
return err
}
var sequences []string
schema := sess.Engine().Dialect().URI().Schema
sess.Engine().SetSchema("")
if err := sess.Table("information_schema.sequences").Cols("sequence_name").Where("sequence_name LIKE 'tmp_recreate__%_id_seq%' AND sequence_catalog = ?", setting.Database.Name).Find(&sequences); err != nil {
log.Error("Unable to find sequences: %v", err)
return err
}
sess.Engine().SetSchema(schema)
sequenceRegexp := regexp.MustCompile(`tmp_recreate__(\w+)_id_seq.*`)
for _, sequence := range sequences {
tableName := sequenceRegexp.FindStringSubmatch(sequence)[1]
newSequenceName := tableName + "_id_seq"
if _, err := sess.Exec(fmt.Sprintf("ALTER SEQUENCE `%s` RENAME TO `%s`", sequence, newSequenceName)); err != nil {
log.Error("Unable to rename %s to %s. Error: %v", sequence, newSequenceName, err)
return err
}
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 sequence %s for %s. Error: %v", newSequenceName, tableName, err)
return err
}
}
return sess.Commit()
}