Mirror sync interval specified as duration string (#1407)

* Sync interval specifed as duration string

* Changed mirror interval text

* make fmt

* Add MinInterval for mirror sync

* Use duration internally

* Changed min default to 10m

* make fmt

* Incorrect default

* Removed defaults in MustDuration()

* Add Mirror interval migration

* Default values corrected

* Use transaction during migration

* Change http 500 to page with error message

* Cleanup session.commit()

models/migrations/v27.go

@@ -0,0 +1,56 @@
+// Copyright 2017 Gitea. 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"
+	"time"
+
+	"github.com/go-xorm/xorm"
+)
+
+func convertIntervalToDuration(x *xorm.Engine) (err error) {
+	type Repository struct {
+		ID      int64
+		OwnerID int64
+		Name    string
+	}
+	type Mirror struct {
+		ID          int64       `xorm:"pk autoincr"`
+		RepoID      int64       `xorm:"INDEX"`
+		Repo        *Repository `xorm:"-"`
+		Interval    time.Duration
+		EnablePrune bool `xorm:"NOT NULL DEFAULT true"`
+
+		Updated        time.Time `xorm:"-"`
+		UpdatedUnix    int64     `xorm:"INDEX"`
+		NextUpdate     time.Time `xorm:"-"`
+		NextUpdateUnix int64     `xorm:"INDEX"`
+
+		address string `xorm:"-"`
+	}
+
+	sess := x.NewSession()
+	defer sess.Close()
+
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	var mirrors []Mirror
+	err = sess.Table("mirror").Select("*").Find(&mirrors)
+	if err != nil {
+		return fmt.Errorf("Query repositories: %v", err)
+	}
+	for _, mirror := range mirrors {
+		mirror.Interval = mirror.Interval * time.Hour
+		_, err := sess.Id(mirror.ID).Cols("interval").Update(mirror)
+		if err != nil {
+			return fmt.Errorf("update mirror interval failed: %v", err)
+		}
+	}
+
+	return sess.Commit()
+}