From 17c0c7055247781438028cbcd2c466daee6c2313 Mon Sep 17 00:00:00 2001
From: Colin Percival <cperciva@FreeBSD.org>
Date: Wed, 4 Apr 2007 03:12:15 +0000
Subject: [PATCH] Add test to confirm that piping a tar archive created by
 bsdtar through 'bsdtar -cf- @-' doesn't alter it.

---
 usr.bin/tar/test/test-basic.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/usr.bin/tar/test/test-basic.sh b/usr.bin/tar/test/test-basic.sh
index a302c526432c..435edadfcb29 100755
--- a/usr.bin/tar/test/test-basic.sh
+++ b/usr.bin/tar/test/test-basic.sh
@@ -359,6 +359,11 @@ mkdir filter-tar-tar
 (cd original && ${BSDTAR} -cf - .) | ${BSDTAR} -cf - @- | (cd filter-tar-tar; ${BSDTAR} -xf -)
 diff -r original filter-tar-tar || echo XXX FAILED XXX
 
+# Make sure that reading and writing a tar archive doesn't change it.
+echo "  bsdtar -cf- @- | cmp"
+(cd original && ${BSDTAR} -cf - .) > original.tar
+${BSDTAR} -cf - @- < original.tar | cmp - original.tar || echo XXX FAILED XXX
+
 # Filtering as format conversion
 echo "  Convert tar archive to cpio archive"
 mkdir filter-tar-cpio