@@ -0,0 +1,59 @@
+package multifile
+
+import (
+	"io"
+	"os"
+	"time"
+
+	"gitlab.com/tozd/go/errors"
+)
+
+type MultiFile struct {
+	files []FileLike
+	io.Writer
+}
+
+type FileLike interface {
+	io.WriteCloser
+	Name() string
+}
+
+func NewMultiFile(files ...FileLike) *MultiFile {
+	writers := make([]io.Writer, len(files))
+	for i, w := range files {
+		writers[i] = w
+	}
+
+	return &MultiFile{
+		files:  files,
+		Writer: io.MultiWriter(writers...),
+	}
+}
+
+func (mf *MultiFile) Close() error {
+	var lastErr error
+	for _, w := range mf.files {
+		err := w.Close()
+		if err != nil {
+			lastErr = err
+		}
+	}
+
+	return lastErr
+}
+
+func (mf *MultiFile) Name() string {
+	return mf.files[0].Name()
+}
+
+func (mf *MultiFile) Chtimes(mtime time.Time) error {
+	var lastErr error
+	for _, f := range mf.files {
+		err := os.Chtimes(f.Name(), mtime, mtime)
+		if err != nil {
+			lastErr = errors.Join(lastErr, err)
+		}
+	}
+
+	return lastErr
+}