You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: repo_base_gogit.go
    path of file: ./repos/gitea/modules/git
    
    the code of the file until where you have to start completion: // Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

//go:build gogit

package git

import (
	"context"
	"path/filepath"

	gitealog "code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/util"

	"github.com/go-git/go-billy/v5"
	"github.com/go-git/go-billy/v5/osfs"
	gogit "github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
	"github.com/go-git/go-git/v5/plumbing/cache"
	"github.com/go-git/go-git/v5/storage/filesystem"
)

func init() {
	isGogit = true
}

// Repository represents a Git repository.
type Repository struct {
	Path string

	tagCache *ObjectCache

	gogitRepo    *gogit.Repository
	gogitStorage *filesystem.Storage
	gpgSettings  *GPGSettings

	Ctx             context.Context
	LastCommitCache *LastCommitCache
	objectFormat    ObjectFormat
}

// openRepositoryWithDefaultContext opens the repository at the given path with DefaultContext.
func openRepositoryWithDefaultContext(repoPath string) (*Repository, error) {
	return OpenRepository(DefaultContext, repoPath)
}


    
func OpenRepository(ctx context.Context, repoPath string) (*Repository, error) {
	repoPath, err := filepath.Abs(repoPath)
	if err != nil {
		return nil, err
	} else if !isDir(repoPath) {
		return nil, util.NewNotExistErrorf("no such file or directory")
	}

	fs := osfs.New(repoPath)
	_, err = fs.Stat(".git")
	if err == nil {
		fs, err = fs.Chroot(".git")
		if err != nil {
			return nil, err
		}
	}
	// the "clone --shared" repo doesn't work well with go-git AlternativeFS, https://github.com/go-git/go-git/issues/1006
	// so use "/" for AlternatesFS, I guess it is the same behavior as current nogogit (no limitation or check for the "objects/info/alternates" paths), trust the "clone" command executed by the server.
	var altFs billy.Filesystem
	if setting.IsWindows {
		altFs = osfs.New(filepath.VolumeName(setting.RepoRootPath) + "\\") // TODO: does it really work for Windows? Need some time to check.
	} else {
		altFs = osfs.New("/")
	}
	storage := filesystem.NewStorageWithOptions(fs, cache.NewObjectLRUDefault(), filesystem.Options{KeepDescriptors: true, LargeObjectThreshold: setting.Git.LargeObjectThreshold, AlternatesFS: altFs})
	gogitRepo, err := gogit.Open(storage, fs)
	if err != nil {
		return nil, err
	}

	return &Repository{
		Path:         repoPath,
		gogitRepo:    gogitRepo,
		gogitStorage: storage,
		tagCache:     newObjectCache(),
		Ctx:          ctx,
		objectFormat: ParseGogitHash(plumbing.ZeroHash).Type(),
	}, nil
}