Function CopyFile

pkgs/fileio/file.go:186–240

CopyFile copy file from src to dest.

(src, dest string)

// CopyFile copy file from src to dest.
func CopyFile(src, dest string) error {
	// Read file info.
	info, err := os.Lstat(src)
	if err != nil {
		return err
	}

	// Create symlink if it's a symlink.
	if info.Mode()&os.ModeSymlink != 0 {
		target, err := os.Readlink(src)
		if err != nil {
			return err
		}

		// Remove dest if it exists before creating symlink.
		if _, err := os.Lstat(dest); err == nil {
			if err := os.Remove(dest); err != nil {
				return err
			}
		}

		return os.Symlink(target, dest)
	}

	// Copy normal file.
	srcFile, err := os.Open(src)
	if err != nil {
		return err
	}
	defer srcFile.Close()

	// Remove dest if it exists to avoid "permission denied" for read-only files.
	if _, err := os.Lstat(dest); err == nil {
		if err := os.Remove(dest); err != nil {
			return err
		}
	}

	destFile, err := os.Create(dest)
	if err != nil {
		return err
	}
	defer destFile.Close()

	if _, err := io.Copy(destFile, srcFile); err != nil {
		return err
	}

	// Set the same permissions as the source file.
	if err := os.Chmod(dest, info.Mode()); err != nil {
		return err
	}

	return nil
}

func RenameFile(src, dst string) error {
	info, err := os.Lstat(src)