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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 |