1 # Check how to create a tarball. -*- Autoconf -*-
3 # Copyright (C) 2004 Free Software Foundation, Inc.
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 2, or (at your option)
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23 # _AM_PROG_TAR(FORMAT)
24 # --------------------
25 # Check how to create a tarball in format FORMAT.
26 # FORMAT should be one of `v7', `ustar', or `pax'.
28 # Substitute a variable $(am__tar) that is a command
29 # writing to stdout a FORMAT-tarball containing the directory
31 # tardir=directory && $(am__tar) > result.tar
33 # Substitute a variable $(am__untar) that extract such
34 # a tarball read from stdin.
35 # $(am__untar) < result.tar
36 AC_DEFUN([_AM_PROG_TAR],
37 [# Always define AMTAR for backward compatibility.
38 AM_MISSING_PROG([AMTAR], [tar])
40 [am__tar='${AMTAR} chof - "$$tardir"'; am__untar='${AMTAR} xf -'],
41 [m4_case([$1], [ustar],, [pax],,
42 [m4_fatal([Unknown tar format])])
43 AC_MSG_CHECKING([how to create a $1 tar archive])
44 # Loop over all known methods to create a tar archive until one works.
45 _am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'
46 _am_tools=${am_cv_prog_tar_$1-$_am_tools}
47 # Do not fold the above two line into one, because Tru64 sh and
48 # Solaris sh will not grok spaces in the rhs of `-'.
49 for _am_tool in $_am_tools
53 for _am_tar in tar gnutar gtar;
55 AM_RUN_LOG([$_am_tar --version]) && break
57 am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
58 am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
59 am__untar="$_am_tar -xf -"
62 # Must skip GNU tar: if it does not support --format= it doesn't create
63 # ustar tarball either.
64 (tar --version) >/dev/null 2>&1 && continue
65 am__tar='tar chf - "$$tardir"'
66 am__tar_='tar chf - "$tardir"'
70 am__tar='pax -L -x $1 -w "$$tardir"'
71 am__tar_='pax -L -x $1 -w "$tardir"'
75 am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
76 am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
77 am__untar='cpio -i -H $1 -d'
86 # If the value was cached, stop now. We just wanted to have am__tar
88 test -n "${am_cv_prog_tar_$1}" && break
90 # tar/untar a dummy directory, and stop if the command works
93 echo GrepMe > conftest.dir/file
94 AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
96 if test -s conftest.tar; then
97 AM_RUN_LOG([$am__untar <conftest.tar])
98 grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
103 AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
104 AC_MSG_RESULT([$am_cv_prog_tar_$1])])
106 AC_SUBST([am__untar])