coreutils/coreutils-mvatomic.patch

 src/copy.c           |    5 +++--
 tests/mv/Makefile.am |    4 ++--
 tests/mv/atomic2     |   50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 4 deletions(-)
 create mode 100755 tests/mv/atomic2

diff --git a/src/copy.c b/src/copy.c
index fd31b5c..208a674 100644
--- a/src/copy.c
+++ b/src/copy.c
@@ -1339,10 +1339,11 @@ copy_internal (char const *src_name, char const *dst_name,
	      new_dst = true;
	    }
	  else if (! S_ISDIR (dst_sb.st_mode)
+		   /* Never unlink dst_name when in move mode.  */
+		   && ! x->move_mode
		   && (x->unlink_dest_before_opening
		       || (x->preserve_links && 1 < dst_sb.st_nlink)
-		       || (!x->move_mode
-			   && x->dereference == DEREF_NEVER
+			   || (x->dereference == DEREF_NEVER
			   && S_ISLNK (src_sb.st_mode))
		       ))
	    {
diff --git a/tests/mv/Makefile.am b/tests/mv/Makefile.am
index c121911..92ec68e 100644
--- a/tests/mv/Makefile.am
+++ b/tests/mv/Makefile.am
@@ -1,7 +1,6 @@
 # Make coreutils tests for "mv".                       -*-Makefile-*-

-# Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
-# Free Software Foundation, Inc.
+# Copyright (C) 1998-2008 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -17,6 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

 TESTS = \
+  atomic2 \
   sticky-to-xpart \
   hard-verbose \
   backup-dir \
diff --git a/tests/mv/atomic2 b/tests/mv/atomic2
new file mode 100755
index 0000000..d1029aa
--- /dev/null
+++ b/tests/mv/atomic2
@@ -0,0 +1,50 @@
+#!/bin/sh
+# ensure that mv doesn't first unlink a multi-hard-linked destination
+
+# Copyright (C) 2008 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  mv --version
+fi
+
+. $srcdir/../test-lib.sh
+require_strace_
+
+# Before the fix, mv would unnecessarily unlink the destination symlink:
+#   $ rm -f a b b2; touch a b; ln b b2; strace -e unlink /p/bin/mv a b
+#   unlink("b")                             = 0
+#
+# With the fix, it doesn't call unlink:
+#   $ rm -f a b b2; touch a b; ln b b2; strace -e unlink ./mv a b
+#   $
+
+touch a b || framework_failure
+ln b b2 || framework_failure
+
+fail=0
+
+strace -qe unlink mv a b > out 2>&1 || fail=1
+$EGREP 'unlink.*"b"' out && fail=1
+
+# Ensure that the source, "a", is gone.
+ls -dl a > /dev/null 2>&1 && fail=1
+
+# Ensure that the destination, "b", has link count 1.
+n_links=`stat --printf=%h b` || fail=1
+test "$n_links" = 1 || fail=1
+
+(exit $fail); exit $fail
--
1.5.5.rc0.7.g57e83