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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"
"fmt"
"log"
"os"
"path/filepath"
"strings"
flag "github.com/spf13/pflag"
"github.com/u-root/u-root/pkg/cp"
)
var (
flags struct {
recursive bool
ask bool
force bool
verbose bool
noFollowSymlinks bool
}
input = bufio.NewReader(os.Stdin)
)
func init() {
defUsage := flag.Usage
flag.Usage = func() {
os.Args[0] = "cp [-wRrifvP] file[s] ... dest"
defUsage()
}
flag.BoolVarP(&flags.recursive, "RECURSIVE", "R", false, "copy file hierarchies")
flag.BoolVarP(&flags.recursive, "recursive", "r", false, "alias to -R recursive mode")
flag.BoolVarP(&flags.ask, "interactive", "i", false, "prompt about overwriting file")
flag.BoolVarP(&flags.force, "force", "f", false, "force overwrite files")
flag.BoolVarP(&flags.verbose, "verbose", "v", false, "verbose copy mode")
flag.BoolVarP(&flags.noFollowSymlinks, "no-dereference", "P", false, "don't follow symlinks")
}
// promptOverwrite ask if the user wants overwrite file
func promptOverwrite(dst string) (bool, error) {
fmt.Printf("cp: overwrite %q? ", dst)
answer, err := input.ReadString('\n')
if err != nil {
return false, err
}
if strings.ToLower(answer)[0] != 'y' {
return false, nil
}
return true, nil
}
// cpArgs is a function whose eval the args
// and make decisions for copyfiles
func cpArgs(args []string) error {
todir := false
from, to := args[:len(args)-1], args[len(args)-1]
toStat, err := os.Stat(to)
if err == nil {
todir = toStat.IsDir()
}
if flag.NArg() > 2 && !todir {
log.Fatalf("is not a directory: %s\n", to)
}
opts := cp.Options{
NoFollowSymlinks: flags.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: func(src, dst string, srcfi os.FileInfo) error {
// check if src is dir
if !flags.recursive && srcfi.IsDir() {
log.Printf("cp: -r not specified, omitting directory %s", src)
return cp.ErrSkip
}
dstfi, err := os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
log.Printf("cp: %q: can't handle error %v", dst, err)
return cp.ErrSkip
} else if err != nil {
// dst does not exist.
return nil
}
// dst does exist.
if os.SameFile(srcfi, dstfi) {
log.Printf("cp: %q and %q are the same file", src, dst)
return cp.ErrSkip
}
if flags.ask && !flags.force {
overwrite, err := promptOverwrite(dst)
if err != nil {
return err
}
if !overwrite {
return cp.ErrSkip
}
}
return nil
},
PostCallback: func(src, dst string) {
if flags.verbose {
fmt.Printf("%q -> %q\n", src, dst)
}
},
}
var lastErr error
for _, file := range from {
dst := to
if todir {
dst = filepath.Join(dst, filepath.Base(file))
}
if flags.recursive {
err = opts.CopyTree(file, dst)
} else {
err = opts.Copy(file, dst)
}
if err != nil {
log.Printf("cp: %v\n", err)
lastErr = err
}
}
return lastErr
}
func main() {
flag.Parse()
if flag.NArg() < 2 {
flag.Usage()
os.Exit(1)
}
if err := cpArgs(flag.Args()); err != nil {
os.Exit(1)
}
}