cp.go

/*
Copyright 2020 The Tekton Authors

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 subcommands

import (
	"io"
	"os"
)

// CopyCommand is the name of the copy command.
const CopyCommand = "cp"

// Owner has permission to write and execute, and anybody has
// permission to execute.
const dstPermissions = 0311

// cp copies a files from src to dst.
func cp(src, dst string) error {
	s, err := os.Open(src)
	if err != nil {
		return err
	}
	defer s.Close()

	d, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE, dstPermissions)
	if err != nil {
		return err
	}
	defer d.Close()

	_, err = io.Copy(d, s)
	return err
}