tar-ustar.m4
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tar-ustar.m4
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	dnl Check for a tar program that speaks ustar format
	dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
	dnl
	dnl This file is free software, distributed under the terms of the GNU
	dnl General Public License. As a special exception to the GNU General
	dnl Public License, this file may be distributed as part of a program
	dnl that contains a configuration script generated by Autoconf, under
	dnl the same distribution terms as the rest of that program.

	AC_DEFUN([GNUPG_CHECK_USTAR],
	[
	AC_ARG_WITH(tar,
	AC_HELP_STRING([--with-tar=PATH],[look for a tar program in PATH]),
	[_do_tar=$withval])

	if test x$_do_tar != xno ; then

	if test x$_do_tar = x ; then
	AC_PATH_PROG(TAR,"tar")
	_mytar=$ac_cv_path_TAR
	fi

	# Check if our tar is ustar format. If so, it's good. TODO: Add some
	# code to check various options, etc, to try and create ustar
	# format.

	if test x$_mytar != x ; then
	AC_MSG_CHECKING([whether $_mytar speaks USTAR])
	echo hithere > conftest.txt
	$_mytar -cf - conftest.txt \| (dd skip=257 bs=1 count=5 2>/dev/null \|\| cat) \| grep ustar > /dev/null
	_tar_bad=$?
	rm conftest.txt

	if test x$_tar_bad = x0 ; then
	AC_MSG_RESULT([yes])
	else
	AC_MSG_RESULT([no])
	fi
	fi
	fi

	AM_CONDITIONAL(HAVE_USTAR, test x$_tar_bad = x0)
	])dnl