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// Package cp offers simple file and directory copying for Go.
package cp
import (
"errors"
"io"
"os"
"path/filepath"
"strings"
)
var errCopyFileWithDir = errors.New("dir argument to CopyFile")
// CopyFile copies the file with path src to dst. The new file must not exist.
// It is created with the same permissions as src.
func CopyFile(dst, src string) error {
rf, err := os.Open(src)
if err != nil {
return err
}
defer rf.Close()
rstat, err := rf.Stat()
if err != nil {
return err
}
if rstat.IsDir() {
return errCopyFileWithDir
}
wf, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_EXCL, rstat.Mode())
if err != nil {
return err
}
if _, err := io.Copy(wf, rf); err != nil {
wf.Close()
return err
}
return wf.Close()
}
// CopyAll copies the file or (recursively) the directory at src to dst.
// Permissions are preserved. dst must not already exist.
func CopyAll(dst, src string) error {
return filepath.Walk(src, makeWalkFn(dst, src))
}
func makeWalkFn(dst, src string) filepath.WalkFunc {
return func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
dstPath := filepath.Join(dst, strings.TrimPrefix(path, src))
if info.IsDir() {
return os.Mkdir(dstPath, info.Mode())
}
return CopyFile(dstPath, path)
}
}
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