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| 1 | +# Check how to create a tarball. -*- Autoconf -*- |
| 2 | + |
| 3 | +# Copyright (C) 2004-2018 Free Software Foundation, Inc. |
| 4 | +# |
| 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. |
| 8 | + |
| 9 | +# _AM_PROG_TAR(FORMAT) |
| 10 | +# -------------------- |
| 11 | +# Check how to create a tarball in format FORMAT. |
| 12 | +# FORMAT should be one of 'v7', 'ustar', or 'pax'. |
| 13 | +# |
| 14 | +# Substitute a variable $(am__tar) that is a command |
| 15 | +# writing to stdout a FORMAT-tarball containing the directory |
| 16 | +# $tardir. |
| 17 | +# tardir=directory && $(am__tar) > result.tar |
| 18 | +# |
| 19 | +# Substitute a variable $(am__untar) that extract such |
| 20 | +# a tarball read from stdin. |
| 21 | +# $(am__untar) < result.tar |
| 22 | +# |
| 23 | +AC_DEFUN([_AM_PROG_TAR], |
| 24 | +[# Always define AMTAR for backward compatibility. Yes, it's still used |
| 25 | +# in the wild :-( We should find a proper way to deprecate it ... |
| 26 | +AC_SUBST([AMTAR], ['$${TAR-tar}']) |
| 27 | +
|
| 28 | +# We'll loop over all known methods to create a tar archive until one works. |
| 29 | +_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none' |
| 30 | +
|
| 31 | +m4_if([$1], [v7], |
| 32 | + [am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'], |
| 33 | +
|
| 34 | + [m4_case([$1], |
| 35 | + [ustar], |
| 36 | + [# The POSIX 1988 'ustar' format is defined with fixed-size fields. |
| 37 | + # There is notably a 21 bits limit for the UID and the GID. In fact, |
| 38 | + # the 'pax' utility can hang on bigger UID/GID (see automake bug#8343 |
| 39 | + # and bug#13588). |
| 40 | + am_max_uid=2097151 # 2^21 - 1 |
| 41 | + am_max_gid=$am_max_uid |
| 42 | + # The $UID and $GID variables are not portable, so we need to resort |
| 43 | + # to the POSIX-mandated id(1) utility. Errors in the 'id' calls |
| 44 | + # below are definitely unexpected, so allow the users to see them |
| 45 | + # (that is, avoid stderr redirection). |
| 46 | + am_uid=`id -u || echo unknown` |
| 47 | + am_gid=`id -g || echo unknown` |
| 48 | + AC_MSG_CHECKING([whether UID '$am_uid' is supported by ustar format]) |
| 49 | + if test $am_uid -le $am_max_uid; then |
| 50 | + AC_MSG_RESULT([yes]) |
| 51 | + else |
| 52 | + AC_MSG_RESULT([no]) |
| 53 | + _am_tools=none |
| 54 | + fi |
| 55 | + AC_MSG_CHECKING([whether GID '$am_gid' is supported by ustar format]) |
| 56 | + if test $am_gid -le $am_max_gid; then |
| 57 | + AC_MSG_RESULT([yes]) |
| 58 | + else |
| 59 | + AC_MSG_RESULT([no]) |
| 60 | + _am_tools=none |
| 61 | + fi], |
| 62 | +
|
| 63 | + [pax], |
| 64 | + [], |
| 65 | +
|
| 66 | + [m4_fatal([Unknown tar format])]) |
| 67 | +
|
| 68 | + AC_MSG_CHECKING([how to create a $1 tar archive]) |
| 69 | +
|
| 70 | + # Go ahead even if we have the value already cached. We do so because we |
| 71 | + # need to set the values for the 'am__tar' and 'am__untar' variables. |
| 72 | + _am_tools=${am_cv_prog_tar_$1-$_am_tools} |
| 73 | +
|
| 74 | + for _am_tool in $_am_tools; do |
| 75 | + case $_am_tool in |
| 76 | + gnutar) |
| 77 | + for _am_tar in tar gnutar gtar; do |
| 78 | + AM_RUN_LOG([$_am_tar --version]) && break |
| 79 | + done |
| 80 | + am__tar="$_am_tar --hard-dereference --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"' |
| 81 | + am__tar_="$_am_tar --hard-dereference --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"' |
| 82 | + am__untar="$_am_tar -xf -" |
| 83 | + ;; |
| 84 | + plaintar) |
| 85 | + # Must skip GNU tar: if it does not support --format= it doesn't create |
| 86 | + # ustar tarball either. |
| 87 | + (tar --version) >/dev/null 2>&1 && continue |
| 88 | + am__tar='tar chf --hard-dereference - "$$tardir"' |
| 89 | + am__tar_='tar chf --hard-dereference - "$tardir"' |
| 90 | + am__untar='tar xf -' |
| 91 | + ;; |
| 92 | + pax) |
| 93 | + am__tar='pax -L -x $1 -w "$$tardir"' |
| 94 | + am__tar_='pax -L -x $1 -w "$tardir"' |
| 95 | + am__untar='pax -r' |
| 96 | + ;; |
| 97 | + cpio) |
| 98 | + am__tar='find "$$tardir" -print | cpio -o -H $1 -L' |
| 99 | + am__tar_='find "$tardir" -print | cpio -o -H $1 -L' |
| 100 | + am__untar='cpio -i -H $1 -d' |
| 101 | + ;; |
| 102 | + none) |
| 103 | + am__tar=false |
| 104 | + am__tar_=false |
| 105 | + am__untar=false |
| 106 | + ;; |
| 107 | + esac |
| 108 | +
|
| 109 | + # If the value was cached, stop now. We just wanted to have am__tar |
| 110 | + # and am__untar set. |
| 111 | + test -n "${am_cv_prog_tar_$1}" && break |
| 112 | +
|
| 113 | + # tar/untar a dummy directory, and stop if the command works. |
| 114 | + rm -rf conftest.dir |
| 115 | + mkdir conftest.dir |
| 116 | + echo GrepMe > conftest.dir/file |
| 117 | + AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar]) |
| 118 | + rm -rf conftest.dir |
| 119 | + if test -s conftest.tar; then |
| 120 | + AM_RUN_LOG([$am__untar <conftest.tar]) |
| 121 | + AM_RUN_LOG([cat conftest.dir/file]) |
| 122 | + grep GrepMe conftest.dir/file >/dev/null 2>&1 && break |
| 123 | + fi |
| 124 | + done |
| 125 | + rm -rf conftest.dir |
| 126 | +
|
| 127 | + AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool]) |
| 128 | + AC_MSG_RESULT([$am_cv_prog_tar_$1])]) |
| 129 | +
|
| 130 | +AC_SUBST([am__tar]) |
| 131 | +AC_SUBST([am__untar]) |
| 132 | +]) # _AM_PROG_TAR |
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