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# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

# _AM_PROG_TAR(FORMAT)

# --------------------

# Check how to create a tarball in format FORMAT.

# FORMAT should be one of 'v7', 'ustar', or 'pax'.

#

# Substitute a variable $(am__tar) that is a command

# writing to stdout a FORMAT-tarball containing the directory

# $tardir.

# tardir=directory && $(am__tar) > result.tar

#

# Substitute a variable $(am__untar) that extract such

# a tarball read from stdin.

# $(am__untar) < result.tar

#

AC_DEFUN([_AM_PROG_TAR],

[# Always define AMTAR for backward compatibility. Yes, it's still used

# in the wild :-( We should find a proper way to deprecate it ...

AC_SUBST([AMTAR], ['$${TAR-tar}'])

# We'll loop over all known methods to create a tar archive until one works.

_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'

m4_if([$1], [v7],

[am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'],

[m4_case([$1],

[ustar],

[# The POSIX 1988 'ustar' format is defined with fixed-size fields.

# There is notably a 21 bits limit for the UID and the GID. In fact,

# the 'pax' utility can hang on bigger UID/GID (see automake bug#8343

# and bug#13588).

am_max_uid=2097151 # 2^21 - 1

am_max_gid=$am_max_uid

# The $UID and $GID variables are not portable, so we need to resort

# to the POSIX-mandated id(1) utility. Errors in the 'id' calls

# below are definitely unexpected, so allow the users to see them

# (that is, avoid stderr redirection).

am_uid=`id -u || echo unknown`

am_gid=`id -g || echo unknown`

AC_MSG_CHECKING([whether UID '$am_uid' is supported by ustar format])

if test $am_uid -le $am_max_uid; then

AC_MSG_RESULT([yes])

else

AC_MSG_RESULT([no])

_am_tools=none

fi

AC_MSG_CHECKING([whether GID '$am_gid' is supported by ustar format])

if test $am_gid -le $am_max_gid; then

AC_MSG_RESULT([yes])

else

AC_MSG_RESULT([no])

_am_tools=none

fi],

[pax],

[],

[m4_fatal([Unknown tar format])])

AC_MSG_CHECKING([how to create a $1 tar archive])

# Go ahead even if we have the value already cached. We do so because we

# need to set the values for the 'am__tar' and 'am__untar' variables.

_am_tools=${am_cv_prog_tar_$1-$_am_tools}

for _am_tool in $_am_tools; do

case $_am_tool in

gnutar)

for _am_tar in tar gnutar gtar; do

AM_RUN_LOG([$_am_tar --version]) && break

done

am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'

am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'

am__untar="$_am_tar -xf -"

;;

plaintar)

# Must skip GNU tar: if it does not support --format= it doesn't create

# ustar tarball either.

(tar --version) >/dev/null 2>&1 && continue

am__tar='tar chf - "$$tardir"'

am__tar_='tar chf - "$tardir"'

am__untar='tar xf -'

;;

pax)

am__tar='pax -L -x $1 -w "$$tardir"'

am__tar_='pax -L -x $1 -w "$tardir"'

am__untar='pax -r'

;;

cpio)

am__tar='find "$$tardir" -print | cpio -o -H $1 -L'

am__tar_='find "$tardir" -print | cpio -o -H $1 -L'

am__untar='cpio -i -H $1 -d'

;;

none)

am__tar=false

am__tar_=false

am__untar=false

;;

esac

# If the value was cached, stop now. We just wanted to have am__tar

# and am__untar set.

test -n "${am_cv_prog_tar_$1}" && break

# tar/untar a dummy directory, and stop if the command works.

rm -rf conftest.dir

mkdir conftest.dir

echo GrepMe > conftest.dir/file

AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])

rm -rf conftest.dir

if test -s conftest.tar; then

AM_RUN_LOG([$am__untar <conftest.tar])

AM_RUN_LOG([cat conftest.dir/file])

grep GrepMe conftest.dir/file >/dev/null 2>&1 && break

fi

done

rm -rf conftest.dir

AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])

AC_MSG_RESULT([$am_cv_prog_tar_$1])])

AC_SUBST([am__tar])

AC_SUBST([am__untar])

]) # _AM_PROG_TAR

m4_include([m4/ax_lua.m4])