# -*- sh -*-
# Check environment variables for sane values while testing.

# Copyright (C) 2000, 2001, 2003, 2004, 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 2 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 (FOO=FOO; unset FOO) >/dev/null 2>&1; then
  as_unset=unset
else
  as_unset=false
fi

envvar_check_failed=0
vars='
  BLOCKSIZE
  BLOCK_SIZE
  CDPATH
  DF_BLOCK_SIZE
  DU_BLOCK_SIZE
  LS_BLOCK_SIZE
  LS_COLORS
  POSIXLY_CORRECT
  SIMPLE_BACKUP_SUFFIX
  TIME_STYLE
  VERSION_CONTROL
'
for var in $vars
do
  $as_unset $var
  if eval test \"\${$var+set}\" = set; then
    echo "$0: the $var environment variable is set --" \
      ' unset it and rerun this test' >&2
    envvar_check_failed=1
  fi
done

test "$envvar_check_fail" = 1 && exit 1