#!/bin/sh
# Verify that --preserve-root works.

# Copyright (C) 2006 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
  chown --version
fi

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

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd "$pwd" && 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
mkdir d && ln -s / d/slink-to-root

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

fail=0

# Even if --preserve-root were to malfunction, allowing the chown or
# chgrp to traverse through "/", since we're running as non-root,
# they would be very unlikely to cause any changes.
chown -R --preserve-root 0 / >  out 2>&1 && fail=1
chgrp -R --preserve-root 0 / >> out 2>&1 && fail=1

# Here, if --preserve-root were to malfunction, chmod could make changes,
# but only to files owned and unreadable by the user running this test,
# and then, only to make them readable by owner.
chmod -R --preserve-root u+r / >> out 2>&1 && fail=1

# With -RHh, --preserve-root should trigger nothing,
# since the symlink in question is not a command line argument.
# Contrary to the above commands, these two should succeed.
echo '==== test -RHh' >> out
chown -RHh --preserve-root `id -u` d >> out 2>&1 || fail=1
chgrp -RHh --preserve-root `id -g` d >> out 2>&1 || fail=1

# These must fail.
echo '==== test -RLh' >> out
chown -RLh --preserve-root `id -u` d >> out 2>&1 && fail=1
chgrp -RLh --preserve-root `id -g` d >> out 2>&1 && fail=1

cat <<\EOF > exp || fail=1
chown: it is dangerous to operate recursively on `/'
chown: use --no-preserve-root to override this failsafe
chgrp: it is dangerous to operate recursively on `/'
chgrp: use --no-preserve-root to override this failsafe
chmod: it is dangerous to operate recursively on `/'
chmod: use --no-preserve-root to override this failsafe
==== test -RHh
==== test -RLh
chown: it is dangerous to operate recursively on `d/slink-to-root' (same as `/')
chown: use --no-preserve-root to override this failsafe
chgrp: it is dangerous to operate recursively on `d/slink-to-root' (same as `/')
chgrp: use --no-preserve-root to override this failsafe
EOF

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

(exit $fail); exit $fail