// Copyright 2014 The Gogs Authors. All rights reserved.// Copyright 2019 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package git import (	"bytes"	"io"	"strings") // ObjectType git object typetype ObjectType string const (	// ObjectCommit commit object type	ObjectCommit ObjectType = "commit"	// ObjectTree tree object type	ObjectTree ObjectType = "tree"	// ObjectBlob blob object type	ObjectBlob ObjectType = "blob"	// ObjectTag tag object type	ObjectTag ObjectType = "tag"	// ObjectBranch branch object type	ObjectBranch ObjectType = "branch") // Bytes returns the byte array for the Object Typefunc (o ObjectType) Bytes() []byte {	return []byte(o)} type EmptyReader struct{} func (EmptyReader) Read(p []byte) (int, error) {	return 0, io.EOF} func (repo *Repository) GetObjectFormat() (ObjectFormat, error) {	if repo != nil && repo.objectFormat != nil {		return repo.objectFormat, nil	} 	str, err := repo.hashObject(EmptyReader{}, false)	if err != nil {		return nil, err	}	hash, err := NewIDFromString(str)	if err != nil {		return nil, err	} 	repo.objectFormat = hash.Type() 	return repo.objectFormat, nil} // HashObject takes a reader and returns hash for that readerfunc (repo *Repository) HashObject(reader io.Reader) (ObjectID, error) {	idStr, err := repo.hashObject(reader, true)	if err != nil {		return nil, err	}	return NewIDFromString(idStr)} func (repo *Repository) hashObject(reader io.Reader, save bool) (string, error) {	var cmd *Command	if save {		cmd = NewCommand(repo.Ctx, "hash-object", "-w", "--stdin")	} else {		cmd = NewCommand(repo.Ctx, "hash-object", "--stdin")	}	stdout := new(bytes.Buffer)	stderr := new(bytes.Buffer)	err := cmd.Run(&RunOpts{		Dir:    repo.Path,		Stdin:  reader,		Stdout: stdout,		Stderr: stderr,	})	if err != nil {		return "", err	}	return strings.TrimSpace(stdout.String()), nil} // GetRefType gets the type of the ref based on the stringfunc (repo *Repository) GetRefType(ref string) ObjectType {	if repo.IsTagExist(ref) {		return ObjectTag	} else if repo.IsBranchExist(ref) {		return ObjectBranch	} else if repo.IsCommitExist(ref) {		return ObjectCommit	} else if _, err := repo.GetBlob(ref); err == nil {		return ObjectBlob	}	return ObjectType("invalid")}