bug#9170: [PATCH] cp "restores" permissions it never set

[Paul Eggert]

Thanks for the bug report.  I committed this patch:

>From 3960352798e1815e1682a724f6bd9b02677937d1 Mon Sep 17 00:00:00 2001
From: Paul Eggert <address@hidden>
Date: Mon, 25 Jul 2011 13:36:16 -0700
Subject: [PATCH] cp: don't mishandle existing dir dest permissions (Bug#9170)

* src/copy.c (copy_internal): If we don't create the directory,
then we cannot have omitted permissions.  Problem and trivial
fix reported by Eric Lammerts.
* tests/Makefile.am (TESTS): Add cp/existing-perm-dir.
* tests/cp/existing-perm-dir: New file.
---
 src/copy.c                 |    2 ++
 tests/Makefile.am          |    1 +
 tests/cp/existing-perm-dir |   31 +++++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 0 deletions(-)
 create mode 100755 tests/cp/existing-perm-dir

diff --git a/src/copy.c b/src/copy.c
index df8b1db..b2aeb6e 100644
--- a/src/copy.c
+++ b/src/copy.c
@@ -2211,6 +2211,8 @@ copy_internal (char const *src_name, char const *dst_name,
           if (x->verbose)
             emit_verbose (src_name, dst_name, NULL);
         }
+      else
+        omitted_permissions = 0;
 
       /* Decide whether to copy the contents of the directory.  */
       if (x->one_file_system && device != 0 && device != src_sb.st_dev)
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0a83dae..eb67512 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -323,6 +323,7 @@ TESTS =                                             \
   cp/dir-rm-dest                               \
   cp/dir-slash                                 \
   cp/dir-vs-file                               \
+  cp/existing-perm-dir                         \
   cp/existing-perm-race                                \
   cp/fail-perm                                 \
   cp/fiemap-empty                               \
diff --git a/tests/cp/existing-perm-dir b/tests/cp/existing-perm-dir
new file mode 100755
index 0000000..6ef73f0
--- /dev/null
+++ b/tests/cp/existing-perm-dir
@@ -0,0 +1,31 @@
+#!/bin/sh
+# Make sure cp -p doesn't "restore" permissions it shouldn't (Bug#9170).
+
+# Copyright 2011 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/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ cp
+
+umask 002
+mkdir -p -m ug-s,u=rwx,g=rwx,o=rx src/dir || fail=1
+mkdir -p -m ug-s,u=rwx,g=,o= dst/dir || fail=1
+
+cp -r src/. dst/ || fail=1
+
+mode=`ls -ld dst/dir | cut -b-10`
+test "$mode" = drwx------ || fail=1
+
+Exit $fail
-- 
1.7.4.4