# -*- sh -*-
# Does the current (working-dir.) file system support sparse files?

# 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 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.

# Test whether we can create a sparse file.
# For example, on Darwin6.5 with a file system of type hfs, it's not possible.
# NTFS requires 128K before a hole appears in a sparse file.
t=sparse.$$
dd bs=1 seek=128K of=$t < /dev/null 2> /dev/null
set x `du -sk $t`
kb_size=$2
rm -f $t
if test $kb_size -ge 128; then
  echo "$0: skipping this test, since this file system doesn't support" \
    sparse files 1>&2
  (exit 77); exit 77
fi