96 lines
3.0 KiB
Plaintext
96 lines
3.0 KiB
Plaintext
# Check how to create a tarball. -*- Autoconf -*-
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# Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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#
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# serial 2
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# _AM_PROG_TAR(FORMAT)
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# --------------------
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# Check how to create a tarball in format FORMAT.
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# FORMAT should be one of `v7', `ustar', or `pax'.
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#
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# Substitute a variable $(am__tar) that is a command
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# writing to stdout a FORMAT-tarball containing the directory
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# $tardir.
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# tardir=directory && $(am__tar) > result.tar
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#
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# Substitute a variable $(am__untar) that extract such
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# a tarball read from stdin.
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# $(am__untar) < result.tar
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AC_DEFUN([_AM_PROG_TAR],
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[# Always define AMTAR for backward compatibility.
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AM_MISSING_PROG([AMTAR], [tar])
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m4_if([$1], [v7],
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[am__tar='${AMTAR} chof - "$$tardir"'; am__untar='${AMTAR} xf -'],
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[m4_case([$1], [ustar],, [pax],,
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[m4_fatal([Unknown tar format])])
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AC_MSG_CHECKING([how to create a $1 tar archive])
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# Loop over all known methods to create a tar archive until one works.
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_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'
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_am_tools=${am_cv_prog_tar_$1-$_am_tools}
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# Do not fold the above two line into one, because Tru64 sh and
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# Solaris sh will not grok spaces in the rhs of `-'.
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for _am_tool in $_am_tools
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do
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case $_am_tool in
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gnutar)
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for _am_tar in tar gnutar gtar;
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do
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AM_RUN_LOG([$_am_tar --version]) && break
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done
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am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
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am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
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am__untar="$_am_tar -xf -"
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;;
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plaintar)
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# Must skip GNU tar: if it does not support --format= it doesn't create
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# ustar tarball either.
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(tar --version) >/dev/null 2>&1 && continue
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am__tar='tar chf - "$$tardir"'
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am__tar_='tar chf - "$tardir"'
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am__untar='tar xf -'
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;;
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pax)
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am__tar='pax -L -x $1 -w "$$tardir"'
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am__tar_='pax -L -x $1 -w "$tardir"'
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am__untar='pax -r'
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;;
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cpio)
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am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
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am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
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am__untar='cpio -i -H $1 -d'
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;;
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none)
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am__tar=false
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am__tar_=false
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am__untar=false
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;;
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esac
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# If the value was cached, stop now. We just wanted to have am__tar
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# and am__untar set.
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test -n "${am_cv_prog_tar_$1}" && break
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# tar/untar a dummy directory, and stop if the command works
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rm -rf conftest.dir
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mkdir conftest.dir
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echo GrepMe > conftest.dir/file
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AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
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rm -rf conftest.dir
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if test -s conftest.tar; then
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AM_RUN_LOG([$am__untar <conftest.tar])
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grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
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fi
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done
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rm -rf conftest.dir
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AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
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AC_MSG_RESULT([$am_cv_prog_tar_$1])])
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AC_SUBST([am__tar])
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AC_SUBST([am__untar])
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]) # _AM_PROG_TAR
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