Support appending to empty archives.

diff --git a/tar/write.c b/tar/write.c
index 273fdda3bd9f2d95cff755e39163819419581439..98ae2d95c9a3321b35e771df4cab9dcc13e0fc60 100644 (file)
--- a/tar/write.c
+++ b/tar/write.c
@@ -235,6 +235,7 @@ tar_mode_r(struct bsdtar *bsdtar)
 
        a = archive_read_new();
        archive_read_support_filter_all(a);
+       archive_read_support_format_empty(a);
        archive_read_support_format_tar(a);
        archive_read_support_format_gnutar(a);
        r = archive_read_open_fd(a, bsdtar->fd, 10240);