tar: compat: handle tarballs with only one zero block at the end
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index 274bd46..7493d91 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -90,7 +90,15 @@
again_after_align:
- xread(archive_handle->src_fd, &tar, 512);
+ i = full_read(archive_handle->src_fd, &tar, 512);
+ /* if GNU tar sees EOF in above read, it says:
+ * "tar: A lone zero block at N", where N = kilobyte
+ * where EOF was met (not EOF block, actual EOF!),
+ * and tar will exit with error code 0! Mimic exit(0): */
+ if (i == 0)
+ xfunc_error_retval = 0;
+ if (i != 512)
+ bb_error_msg_and_die("short read");
archive_handle->offset += 512;
/* If there is no filename its an empty header */