filestore: Do not error out on unexpected EOF

filestore/filestore.go

@@ -85,6 +85,15 @@ func (store FileStore) WriteChunk(id string, offset int64, src io.Reader) (int64
 	defer file.Close()
 
 	n, err := io.Copy(file, src)
+
+	// If the HTTP PATCH request gets interrupted in the middle (e.g. because
+	// the user wants to pause the upload), Go's net/http returns an io.ErrUnexpectedEOF.
+	// However, for FileStore it's not important whether the stream has ended
+	// on purpose or accidentally.
+	if err == io.ErrUnexpectedEOF {
+		err = nil
+	}
+
 	return n, err
 }