Bug#227081: cp does not truncate existing destinations

[Matt Kraai <kraai@ftbfs.org>]

Package: busybox-cvs
Version: 20040101-2
Severity: grave
Tags: patch

cp does not truncate existing destinations.  That is, after
running

 echo foo > foo
 echo fubar > fubar
 cp foo fubar

the contents of fubar are

 foo
 r

instead of

 foo

This breaks debian-installer.

The attached patch fixes it.

-- 
Matt Kraai                                         kraai@ftbfs.org

diff -ru busybox-cvs-20040101-old/libbb/copy_file.c busybox-cvs-20040101/libbb/copy_file.c
--- busybox-cvs-20040101-old/libbb/copy_file.c	2004-01-09 17:32:08.000000000 -0800
+++ busybox-cvs-20040101/libbb/copy_file.c	2004-01-09 17:39:09.000000000 -0800
@@ -153,7 +153,7 @@
 				}
 			}
 
-			dst_fd = open(dest, O_WRONLY);
+			dst_fd = open(dest, O_WRONLY|O_TRUNC);
 			if (dst_fd == -1) {
 				if (!(flags & FILEUTILS_FORCE)) {
 					bb_perror_msg("unable to open `%s'", dest);