// Copyright 2019 Drone IO, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package docker

import (
	"archive/tar"
	"bytes"
	"time"

	"github.com/drone/drone-runtime/engine"
)

// helper function creates a tarfile that can be uploaded
// into the Docker container.
func createTarfile(file *engine.File, mount *engine.FileMount) []byte {
	w := new(bytes.Buffer)
	t := tar.NewWriter(w)
	h := &tar.Header{
		Name:    mount.Path,
		Mode:    mount.Mode,
		Size:    int64(len(file.Data)),
		ModTime: time.Now(),
	}
	t.WriteHeader(h)
	t.Write(file.Data)
	return w.Bytes()
}
