Sync releases table with tags on push and for mirrors (#2459)

* Sync releases table with tags on push and for mirrors

* Code style fixes

* Fix api to return only releases

* Optimize release creation and update
Minimize posibility of race conditions

* Fix release lower tag name updating

* handle tag reference update by addionally comparing commit id

models/migrations/migrations.go

@@ -132,6 +132,8 @@ var migrations = []Migration{
 	NewMigration("migrate protected branch struct", migrateProtectedBranchStruct),
 	// v41 -> v42
 	NewMigration("add default value to user prohibit_login", addDefaultValueToUserProhibitLogin),
+	// v42 -> v43
+	NewMigration("add tags to releases and sync existing repositories", releaseAddColumnIsTagAndSyncTags),
 }
 
 // Migrate database to current version

models/migrations/v42.go

@@ -0,0 +1,57 @@
+// Copyright 2017 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"
+
+	"code.gitea.io/git"
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/go-xorm/xorm"
+)
+
+// ReleaseV39 describes the added field for Release
+type ReleaseV39 struct {
+	IsTag bool `xorm:"NOT NULL DEFAULT false"`
+}
+
+// TableName will be invoked by XORM to customrize the table name
+func (*ReleaseV39) TableName() string {
+	return "release"
+}
+
+func releaseAddColumnIsTagAndSyncTags(x *xorm.Engine) error {
+	if err := x.Sync2(new(ReleaseV39)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+
+	// For the sake of SQLite3, we can't use x.Iterate here.
+	offset := 0
+	pageSize := 20
+	for {
+		repos := make([]*models.Repository, 0, pageSize)
+		if err := x.Table("repository").Asc("id").Limit(pageSize, offset).Find(&repos); err != nil {
+			return fmt.Errorf("select repos [offset: %d]: %v", offset, err)
+		}
+		for _, repo := range repos {
+			gitRepo, err := git.OpenRepository(repo.RepoPath())
+			if err != nil {
+				log.Warn("OpenRepository: %v", err)
+				continue
+			}
+
+			if err = models.SyncReleasesWithTags(repo, gitRepo); err != nil {
+				log.Warn("SyncReleasesWithTags: %v", err)
+			}
+		}
+		if len(repos) < pageSize {
+			break
+		}
+		offset += pageSize
+	}
+	return nil
+}