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+# -*- 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