1 # Check how to create a tarball. -*- Autoconf -*-
3 # Copyright (C) 2004-2012 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
11 # _AM_PROG_TAR(FORMAT)
12 # --------------------
13 # Check how to create a tarball in format FORMAT.
14 # FORMAT should be one of `v7', `ustar', or `pax'.
16 # Substitute a variable $(am__tar) that is a command
17 # writing to stdout a FORMAT-tarball containing the directory
19 # tardir=directory && $(am__tar) > result.tar
21 # Substitute a variable $(am__untar) that extract such
22 # a tarball read from stdin.
23 # $(am__untar) < result.tar
24 AC_DEFUN([_AM_PROG_TAR],
25 [# Always define AMTAR for backward compatibility. Yes, it's still used
26 # in the wild :-( We should find a proper way to deprecate it ...
27 AC_SUBST([AMTAR], ['$${TAR-tar}'])
29 [am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'],
30 [m4_case([$1], [ustar],, [pax],,
31 [m4_fatal([Unknown tar format])])
32 AC_MSG_CHECKING([how to create a $1 tar archive])
33 # Loop over all known methods to create a tar archive until one works.
34 _am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'
35 _am_tools=${am_cv_prog_tar_$1-$_am_tools}
36 # Do not fold the above two line into one, because Tru64 sh and
37 # Solaris sh will not grok spaces in the rhs of `-'.
38 for _am_tool in $_am_tools
42 for _am_tar in tar gnutar gtar;
44 AM_RUN_LOG([$_am_tar --version]) && break
46 am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
47 am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
48 am__untar="$_am_tar -xf -"
51 # Must skip GNU tar: if it does not support --format= it doesn't create
52 # ustar tarball either.
53 (tar --version) >/dev/null 2>&1 && continue
54 am__tar='tar chf - "$$tardir"'
55 am__tar_='tar chf - "$tardir"'
59 am__tar='pax -L -x $1 -w "$$tardir"'
60 am__tar_='pax -L -x $1 -w "$tardir"'
64 am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
65 am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
66 am__untar='cpio -i -H $1 -d'
75 # If the value was cached, stop now. We just wanted to have am__tar
77 test -n "${am_cv_prog_tar_$1}" && break
79 # tar/untar a dummy directory, and stop if the command works
82 echo GrepMe > conftest.dir/file
83 AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
85 if test -s conftest.tar; then
86 AM_RUN_LOG([$am__untar <conftest.tar])
87 grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
92 AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
93 AC_MSG_RESULT([$am_cv_prog_tar_$1])])