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

# Copyright (C) 2000-2022 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 <https://www.gnu.org/licenses/>.

if (FOO=FOO; unset FOO) >/dev/null 2>&1; then
  as_unset=unset
else
  as_unset=false
fi

envvar_check_fail=0
vars='
  _POSIX2_VERSION
  _STDBUF_E
  _STDBUF_I
  _STDBUF_O
  BASH_ENV
  BLOCKSIZE
  BLOCK_SIZE
  CDPATH
  COLUMNS
  ENV
  LANGUAGE
  POSIXLY_CORRECT
  QUOTING_STYLE
  SIMPLE_BACKUP_SUFFIX
  TABSIZE
  TERM
  COLORTERM
  TIME_STYLE
  TMPDIR
  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_fail=1
  fi
done

test "$envvar_check_fail" = 1 && exit 1