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Fix postgres ID sequences broken by recreate-table (#15015)

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* 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>
This commit is contained in:
zeripath 2021-03-18 06:06:40 +00:00 • committed by GitHub
parent 71aca93dec
commit 070c57867d
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 198 additions and 1 deletions
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61
models/consistency.go
View file

@ -5,10 +5,13 @@
package models
import (
"fmt"
"reflect"
"regexp"
"strings"
"testing"
"code.gitea.io/gitea/modules/setting"
"github.com/stretchr/testify/assert"
"xorm.io/builder"
)
@ -315,3 +318,61 @@ func CountCommentTypeLabelWithEmptyLabel() (int64, error) {
func FixCommentTypeLabelWithEmptyLabel() (int64, error) {
return x.Where(builder.Eq{"type": CommentTypeLabel, "label_id": 0}).Delete(new(Comment))
}
// CountBadSequences looks for broken sequences from recreate-table mistakes
func CountBadSequences() (int64, error) {
if !setting.Database.UsePostgreSQL {
return 0, nil
}
sess := x.NewSession()
defer sess.Close()
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 {
return 0, err
}
sess.Engine().SetSchema(schema)
return int64(len(sequences)), nil
}
// FixBadSequences fixes for broken sequences from recreate-table mistakes
func FixBadSequences() 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 {
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 {
return err
}
if _, err := sess.Exec(fmt.Sprintf("SELECT setval('%s', COALESCE((SELECT MAX(id)+1 FROM `%s`), 1), false)", newSequenceName, tableName)); err != nil {
return err
}
}
return sess.Commit()
}