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-dnl @synopsis AX_PAX_TAR
-dnl
-dnl Most people will not know about the "tar"-wars a long while back.
-dnl In the end the proponents of cpio lost just as all the oldish
-dnl tar formats were dumped in favor of a new format that based on
-dnl the successful "ustar" format. The extensions did mostly cover
-dnl a portable definition of filenames and such stuff.
-
-dnl The most interesting thing however is that the opengroup (the.
-dnl UNIX standardization body) did not document the tool for the
-dnl portable tar format under the name of "tar" but instead it did
-dnl use the name "pax" which stands for "portable archiver". Even
-dnl more so, the "pax" utitility is required to understand the old
-dnl tar and cpio formats but it will default to a "tar"-like variant.
-dnl The "pax" tool has been in the Unix standard ever since UNIX92.
-dnl
-dnl Interestingly gnu-tar will use the pax features as soon as they
-dnl are required - but you can not be sure if gnu-tar is available,
-dnl and it is quite likely that the system tar will default to the
-dnl old format of the system in whatever it was. On any currrent
-dnl Unix system however one should be able to find "pax", so one
-dnl should prefer that one as the most portable tool.
-
-dnl The downside is however that the commandline options of "pax"
-dnl are different from "tar"/"gtar". That's why we define two
-dnl subst'ed names here - PAX_TAR_CREATE and PAX_TAR_EXTRACT, For
-dnl extra portability the first argument should be "*.tar" file
-dnl name but you should be aware that in most cases the "pax" tool
-dnl is invoked. Nota bene: do not use "*.pax" as the file name
-dnl extension because some file managers interpret it as a TeX file.
-dnl
-dnl @category C
-dnl @author Guido U. Draheim <guidod@gmx.de>
-dnl @version 2009-05-22
-dnl @license GPLWithACException
-
-AC_DEFUN([_AX_PAX_TAR_TOOL],[
-if test -z "$ac_cv_pax_tar_tool"; then
- AC_PATH_PROG([PAX],[pax], :)
- if test "$ac_cv_path_PAX" != ":"; then
- ac_cv_pax_tar_tool="pax"
- else #3
- AC_PATH_PROG([GNUTAR],[gnutar], :)
- if test "$ac_cv_path_GNUTAR" != ":"; then
- ac_cv_pax_tar_tool="gnutar"
- else #1
- AC_PATH_PROG([GTAR],[gtar], :)
- if test "$ac_cv_path_GTAR" != ":"; then
- ac_cv_pax_tar_tool="gtar"
- else #2
- AC_PATH_PROG([TAR],[tar], :)
- if test "$ac_cv_path_TAR" != ":"; then
- ac_cv_pax_tar_tool="tar"
- fi
- fi fi fi #3 #2 #1
- AC_MSG_CHECKING([for portable tar tool])
- AC_MSG_RESULT([$ac_cv_pax_tar_tool])
-fi
-])
-
-dnl TODO: on MacOsX the "--help" documentation of the tool differs
-dnl from the capabilities of the installed pax tool. So test reality.
-AC_DEFUN([_AX_PAX_SINGLE_ARCHIVE],[
- if test "$ac_cv_pax_tar_tool$ax_pax_single_archive" = "pax"; then
- AC_MSG_CHECKING([for pax single archive option])
- echo foo > conftest.txt ; rm -f conftest.tar
- AC_RUN_LOG(["$ac_cv_path_PAX" -w -O -f conftest.tar conftest.txt])
- if test -s conftest.tar; then
- ax_pax_single_archive="-O" ; ac_hint="(probably a BSD pax)"
- else
- ax_pax_single_archive=" " ; ac_hint="(the -O option did not work)"
- fi
- AC_MSG_RESULT([$ax_pax_single_archive $ac_hint])
- fi
-])
-
-AC_DEFUN([_AX_PAX_TAR_CREATE],[
- _AX_PAX_TAR_TOOL
- _AX_PAX_SINGLE_ARCHIVE
- AC_MSG_CHECKING([for command to create portable tar archives])
- if test "$ac_cv_pax_tar_tool" = "gnutar"; then
- ax_pax_tar_create="'$ac_cv_path_GNUTAR' cf"
- elif test "$ac_cv_pax_tar_tool" = "gtar"; then
- ax_pax_tar_create="'$ac_cv_path_GTAR' cf"
- elif test "$ac_cv_pax_tar_tool" = "pax"; then
- ax_pax_tar_create="'$ac_cv_path_PAX' -w $ax_pax_single_archive -f"
- elif test "$ac_cv_pax_tar_tool" = "tar"; then
- ax_pax_tar_create="'$ac_cv_path_TAR' cf"
- else
- ax_pax_tar_create=": 'unknown pax tar tool $ac_cv_pax_tar_tool'"
- fi
- AC_MSG_RESULT([$ax_pax_tar_create])
-])
-
-AC_DEFUN([_AX_PAX_TAR_EXTRACT],[
- _AX_PAX_TAR_TOOL
- _AX_PAX_SINGLE_ARCHIVE
- AC_MSG_CHECKING([for command to extract portable tar archives])
- if test "$ac_cv_pax_tar_tool" = "gnutar"; then
- ax_pax_tar_extract="'$ac_cv_path_GNUTAR' xf"
- elif test "$ac_cv_pax_tar_tool" = "gtar"; then
- ax_pax_tar_extract="'$ac_cv_path_GTAR' xf"
- elif test "$ac_cv_pax_tar_tool" = "pax"; then
- ax_pax_tar_extract="'$ac_cv_path_PAX' -r $ax_pax_single_archive -f"
- elif test "$ac_cv_pax_tar_tool" = "tar"; then
- ax_pax_tar_extract="'$ac_cv_path_TAR' xf"
- else
- ax_pax_tar_extract=": 'unknown pax tar tool $ac_cv_pax_tar_tool'"
- fi
- AC_MSG_RESULT([$ax_pax_tar_extract])
-])
-
-AC_DEFUN([AX_PAX_TAR_CREATE],[dnl
-_AX_PAX_TAR_CREATE
-m4_ifval([$1],[dnl
-$1="$ax_pax_tar_create"
-AC_SUBST([$1])
-],[dnl
-PAX_TAR_CREATE="$ax_pax_tar_create"
-AC_SUBST([PAX_TAR_CREATE])
-])
-])
-
-AC_DEFUN([AX_PAX_TAR_EXTRACT],[dnl
-_AX_PAX_TAR_EXTRACT
-m4_ifval([$1],[dnl
-$1="$ax_pax_tar_extract"
-AC_SUBST([$1])
-],[dnl
-PAX_TAR_EXTRACT="$ax_pax_tar_extract"
-AC_SUBST([PAX_TAR_EXTRACT])
-])
-])
-