Add migrate repo archiver and packages storage support on command line (#20757)

* Add migrate repo archiver and packages storage support on command line

* Fix typo

* Use stdCtx

* Use packageblob and fix command description

* Add migrate packages unit tests

* Fix comment year

* Fix the migrate storage command line description

* Update cmd/migrate_storage.go

Co-authored-by: zeripath <art27@cantab.net>

* Update cmd/migrate_storage.go

Co-authored-by: zeripath <art27@cantab.net>

* Update cmd/migrate_storage.go

Co-authored-by: zeripath <art27@cantab.net>

* Fix test

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: zeripath <art27@cantab.net>

1 files changed, 34 insertions, 0 deletions

diff --git a/models/db/iterate.go b/models/db/iterate.go
new file mode 100644
index 0000000000..3d4fa06eeb
--- /dev/null
+++ b/models/db/iterate.go
@@ -0,0 +1,34 @@
+// Copyright 2022 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 db
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// IterateObjects iterate all the Bean object
+func IterateObjects[Object any](ctx context.Context, f func(repo *Object) error) error {
+	var start int
+	batchSize := setting.Database.IterateBufferSize
+	sess := GetEngine(ctx)
+	for {
+		repos := make([]*Object, 0, batchSize)
+		if err := sess.Limit(batchSize, start).Find(&repos); err != nil {
+			return err
+		}
+		if len(repos) == 0 {
+			return nil
+		}
+		start += len(repos)
+
+		for _, repo := range repos {
+			if err := f(repo); err != nil {
+				return err
+			}
+		}
+	}
+}