gitea/models/migrations/migrations.go

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package migrations
import (
"errors"
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"github.com/go-xorm/xorm"
)
type migration func(*xorm.Engine) error
// The version table. Should have only one row with id==1
type Version struct {
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Id int64
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Version int64
}
// This is a sequence of migrations. Add new migrations to the bottom of the list.
// If you want to "retire" a migration, replace it with "expiredMigration"
var migrations = []migration{}
// Migrate database to current version
func Migrate(x *xorm.Engine) error {
if err := x.Sync(new(Version)); err != nil {
return err
}
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currentVersion := &Version{Id: 1}
has, err := x.Get(currentVersion)
if err != nil {
return err
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} else if !has {
if _, err = x.InsertOne(currentVersion); err != nil {
return err
}
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}
v := currentVersion.Version
for i, migration := range migrations[v:] {
if err = migration(x); err != nil {
return err
}
currentVersion.Version = v + int64(i) + 1
if _, err = x.Id(1).Update(currentVersion); err != nil {
return err
}
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}
return nil
}
func expiredMigration(x *xorm.Engine) error {
return errors.New("You are migrating from a too old gogs version")
}