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cp.go
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// Copyright 2016-2017 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// cp copies files.
//
// Synopsis:
//
// cp [-rRfivwP] FROM... TO
//
// Options:
//
// -w n: number of worker goroutines
// -R: copy file hierarchies
// -r: alias to -R recursive mode
// -i: prompt about overwriting file
// -f: force overwrite files
// -v: verbose copy mode
// -P: don't follow symlinks
package main
import (
"bufio"
"flag"
"fmt"
"io"
"log"
"os"
"path/filepath"
"strings"
"github.com/u-root/u-root/pkg/cp"
"github.com/u-root/u-root/pkg/uroot/unixflag"
)
type flags struct {
recursive bool
ask bool
force bool
verbose bool
noFollowSymlinks bool
}
// promptOverwrite ask if the user wants overwrite file
func promptOverwrite(dst string, out io.Writer, in *bufio.Reader) (bool, error) {
fmt.Fprintf(out, "cp: overwrite %q? ", dst)
answer, err := in.ReadString('\n')
if err != nil {
return false, err
}
if strings.ToLower(answer)[0] != 'y' {
return false, nil
}
return true, nil
}
func setupPreCallback(recursive, ask, force bool, writer io.Writer, reader bufio.Reader) func(string, string, os.FileInfo) error {
return func(src, dst string, srcfi os.FileInfo) error {
// check if src is dir
if !recursive && srcfi.IsDir() {
fmt.Fprintf(writer, "cp: -r not specified, omitting directory %s\n", src)
return cp.ErrSkip
}
dstfi, err := os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
fmt.Fprintf(writer, "cp: %q: can't handle error %v\n", dst, err)
return cp.ErrSkip
} else if err != nil {
// dst does not exist.
return nil
}
// dst does exist.
if os.SameFile(srcfi, dstfi) {
fmt.Fprintf(writer, "cp: %q and %q are the same file\n", src, dst)
return cp.ErrSkip
}
if ask && !force {
overwrite, err := promptOverwrite(dst, writer, &reader)
if err != nil {
return err
}
if !overwrite {
return cp.ErrSkip
}
}
return nil
}
}
func setupPostCallback(verbose bool, w io.Writer) func(src, dst string) {
return func(src, dst string) {
if verbose {
fmt.Fprintf(w, "%q -> %q\n", src, dst)
}
}
}
// run evaluates the falgs and args and makes decisions for copyfiles
func run(args []string, w io.Writer, i *bufio.Reader) error {
var f flags
fs := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
fs.BoolVar(&f.recursive, "RECURSIVE", false, "copy file hierarchies")
fs.BoolVar(&f.recursive, "R", false, "copy file hierarchies (shorthand)")
fs.BoolVar(&f.recursive, "recursive", false, "alias to -R recursive mode")
fs.BoolVar(&f.recursive, "r", false, "alias to -R recursive mode (shorthand)")
fs.BoolVar(&f.ask, "interactive", false, "prompt about overwriting file")
fs.BoolVar(&f.ask, "i", false, "prompt about overwriting file (shorthand)")
fs.BoolVar(&f.force, "force", false, "force overwrite files")
fs.BoolVar(&f.force, "f", false, "force overwrite files (shorthand)")
fs.BoolVar(&f.verbose, "verbose", false, "verbose copy mode")
fs.BoolVar(&f.verbose, "v", false, "verbose copy mode (shorthand)")
fs.BoolVar(&f.noFollowSymlinks, "no-dereference", false, "don't follow symlinks")
fs.BoolVar(&f.noFollowSymlinks, "P", false, "don't follow symlinks (shorthand)")
fs.Usage = func() {
fmt.Fprintf(fs.Output(), "Usage: cp [-RrifvP] file[s] ... dest\n\n")
fs.PrintDefaults()
}
fs.Parse(unixflag.ArgsToGoArgs(args[1:]))
if fs.NArg() < 2 {
fs.Usage()
os.Exit(1)
}
todir := false
from, to := fs.Args()[:fs.NArg()-1], fs.Args()[fs.NArg()-1]
toStat, err := os.Stat(to)
if err == nil {
todir = toStat.IsDir()
}
if fs.NArg() > 2 && !todir {
return eNotDir
}
opts := cp.Options{
NoFollowSymlinks: f.noFollowSymlinks,
// cp the command makes sure that
//
// (1) the files it's copying aren't already the same,
// (2) the user is asked about overwriting an existing file if
// one is already there.
PreCallback: setupPreCallback(f.recursive, f.ask, f.force, w, *i),
PostCallback: setupPostCallback(f.verbose, w),
}
var lastErr error
for _, file := range from {
dst := to
if todir {
dst = filepath.Join(dst, filepath.Base(file))
}
if f.recursive {
lastErr = opts.CopyTree(file, dst)
} else {
lastErr = opts.Copy(file, dst)
}
}
return lastErr
}
func main() {
err := run(os.Args, os.Stderr, bufio.NewReader(os.Stdin))
if err != nil {
log.Fatalf("%q", err)
}
}