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