package main

/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <mitch@nerdfortress.dev> wrote this file. As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return
 * ----------------------------------------------------------------------------
 */

import (
	"io"
	"os"
)

/**
clone copies the contents of cloneSource to cloneTarget
@param cloneBs int is the block size used for the cloning
@param cloneSource string is the source file / volume for the clone
@param cloneTarget string is the target file / volume for the clone
*/
func clone(cloneBs int, cloneSource string, cloneTarget string) {
	p := make([]byte, cloneBs)
	fSource, err := os.Open(cloneSource)
	defer fSource.Close()
	errorHandler(err)
	//todo add file not found handling
	fTarget, err := os.OpenFile(cloneTarget, os.O_WRONLY, 0644)
	defer fTarget.Close()
	errorHandler(err)
	//todo progress indicator
	for {
		n, err := fSource.Read(p)
		if err == io.EOF {
			_, err = fTarget.Write(p[:n])
			errorHandler(err)
			break
		}
		errorHandler(err)
		_, err = fTarget.Write(p[:n])
		errorHandler(err)
	}
	fTarget.Sync()
}