LFS support to be stored on minio (#12518)

* LFS support to be stored on minio

* Fix test

* Fix lint

* Fix lint

* Fix check

* Fix test

* Update documents and add migration for LFS

* Fix some bugs

modules/storage/storage.go

@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	"net/url"
+	"time"
 
 	"code.gitea.io/gitea/modules/setting"
 )
@@ -19,10 +20,24 @@ var (
 	ErrURLNotSupported = errors.New("url method not supported")
 )
 
+// Object represents the object on the storage
+type Object interface {
+	io.ReadCloser
+	io.Seeker
+}
+
+// ObjectInfo represents the object info on the storage
+type ObjectInfo interface {
+	Name() string
+	Size() int64
+	ModTime() time.Time
+}
+
 // ObjectStorage represents an object storage to handle a bucket and files
 type ObjectStorage interface {
+	Open(path string) (Object, error)
 	Save(path string, r io.Reader) (int64, error)
-	Open(path string) (io.ReadCloser, error)
+	Stat(path string) (ObjectInfo, error)
 	Delete(path string) error
 	URL(path, name string) (*url.URL, error)
 }
@@ -41,10 +56,21 @@ func Copy(dstStorage ObjectStorage, dstPath string, srcStorage ObjectStorage, sr
 var (
 	// Attachments represents attachments storage
 	Attachments ObjectStorage
+
+	// LFS represents lfs storage
+	LFS ObjectStorage
 )
 
 // Init init the stoarge
 func Init() error {
+	if err := initAttachments(); err != nil {
+		return err
+	}
+
+	return initLFS()
+}
+
+func initAttachments() error {
 	var err error
 	switch setting.Attachment.StoreType {
 	case "local":
@@ -71,3 +97,31 @@ func Init() error {
 
 	return nil
 }
+
+func initLFS() error {
+	var err error
+	switch setting.LFS.StoreType {
+	case "local":
+		LFS, err = NewLocalStorage(setting.LFS.ContentPath)
+	case "minio":
+		minio := setting.LFS.Minio
+		LFS, err = NewMinioStorage(
+			context.Background(),
+			minio.Endpoint,
+			minio.AccessKeyID,
+			minio.SecretAccessKey,
+			minio.Bucket,
+			minio.Location,
+			minio.BasePath,
+			minio.UseSSL,
+		)
+	default:
+		return fmt.Errorf("Unsupported LFS store type: %s", setting.LFS.StoreType)
+	}
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}