#!/bin/sh
# Ensure that cp -a and cp --preserve=context work properly.
# In particular, test on a writable NFS partition.

# Copyright (C) 2007 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

if test "$VERBOSE" = yes; then
  set -x
  cp --version
fi

. $srcdir/../envvar-check
. $srcdir/../lang-default
. $srcdir/../selinux
PRIV_CHECK_ARG=require-root . $srcdir/../priv-check

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd "$pwd"; umount $tmp/mnt; chmod -R u+rwx $t0 && rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15

framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1

# Create a file system, then mount it with the context=... option.
dd if=/dev/zero of=blob bs=8192 count=200 > /dev/null 2>&1 \
                                             || framework_failure=1
mkdir mnt                                    || framework_failure=1
mkfs -t ext2 -F blob > /dev/null 2>&1        || framework_failure=1
mount -oloop,context=system_u:object_r:removable_t blob mnt \
                                             || framework_failure=1
cd mnt                                       || framework_failure=1

echo > f                                     || framework_failure=1
echo > g                                     || framework_failure=1

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

fail=0

# /bin/cp from coreutils-6.7-3.fc7 would fail this test by letting cp
# succeed (giving no diagnostics), yet leaving the destination file empty.
cp -a f g 2>err || fail=1
test -s g       || fail=1     # The destination file must not be empty.
test -s err     && fail=1     # There must be no stderr output.

rm -f g err
echo > g

# =====================================================
# Here, we expect cp to fail, because it cannot set the SELinux
# security context through NFS or a mount with fixed context.
cp --preserve=context f g 2> out && fail=1

# Here, we *do* expect the destination to be empty.
test -s g && fail=1

# An alternative to the current approach would be to run in a confined
# domain (maybe creating/loading it) that lacks the required permissions
# to the file type.
# Note: this test could also be run by a regular (non-root) user in an
# NFS mounted directory.  When doing that, I get this diagnostic:
# cp: failed to set the security context of `g' to `system_u:object_r:nfs_t': \
#   Operation not supported
sed "s/ .g' to .*//" out > k
mv k out

cat <<\EOF > exp || fail=1
cp: failed to set the security context of
EOF

cmp out exp || fail=1
test $fail = 1 && diff out exp 2> /dev/null

(exit $fail); exit $fail