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- # (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
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