#!/bin/sh
# Ensure that cp copies contents of non-empty "regular" file with st_size==0

# 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, see <http://www.gnu.org/licenses/>.

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

. $srcdir/../envvar-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
touch empty || framework_failure=1

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

f=/proc/cpuinfo
test -r $f || f=empty

fail=0
cat $f > out || fail=1

# With coreutils-6.9, this would create a zero-length "exp" file.
cp $f exp || fail=1

# Don't simply compare contents; they might differ,
# e.g., if CPU freq changes between cat and cp invocations.
# Instead, simply compare whether they're both nonempty.
test -s out && { rm -f out; echo nonempty > out; }
test -s exp && { rm -f exp; echo nonempty > exp; }

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

(exit $fail); exit $fail