Merge pull request #870 from phsmit/migrations

Create db migrations framework

1 files changed, 53 insertions, 0 deletions

diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
new file mode 100644
index 00000000..3586e5d0
--- /dev/null
+++ b/models/migrations/migrations.go
@@ -0,0 +1,53 @@
+package migrations
+
+import (
+	"errors"
+
+	"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 {
+	Id      int64
+	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
+	}
+
+	currentVersion := &Version{Id: 1}
+	has, err := x.Get(currentVersion)
+	if err != nil {
+		return err
+	} else if !has {
+		if _, err = x.InsertOne(currentVersion); err != nil {
+			return err
+		}
+	}
+
+	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
+		}
+	}
+	return nil
+}
+
+func expiredMigration(x *xorm.Engine) error {
+	return errors.New("You are migrating from a too old gogs version")
+}