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annotate scripts/miscellaneous/private/tar_is_bsd.m @ 27794:45ad2127582b

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doc: grammarcheck scripts before 6.1 release. * num2str.m, rescale.m, rotx.m, roty.m, rotz.m, tar_is_bsd.m, pkg.m, gtext.m, polar.m, smooth3.m, stream2.m, stream3.m, streamline.m, streamtube.m, print.m, unique.m, movmedian.m, movprod.m, movstd.m, movsum.m: grammarcheck scripts before 6.1 release.
author Rik <rik@octave.org>
date Tue, 10 Dec 2019 12:19:09 -0800
parents 3bf19af20af8
children b442ec6dda5c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2019 Andrew Janke
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software: you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation, either version 3 of the License, or
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8 ## (at your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ## GNU General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <https://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {} {@var{out} =} tar_is_bsd ()
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21 ## True if the default tar command is BSD tar.
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22 ##
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23 ## Checks whether the default tar command (the one invoked when an un-prefixed
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24 ## @code{tar} is executed) is BSD tar or another tar. Caches the results for
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25 ## performance.
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26 ##
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27 ## Returns true if the detected tar is BSD tar, and false otherwise. Errors if
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28 ## @code{tar --version} does not succeed.
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29 ## @end deftypefn
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30
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31 function out = tar_is_bsd ()
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32 ## BSD tar needs to be handled differently from GNU tar
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33 persistent cache
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34 if isempty (cache)
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35 [status, tar_ver_str] = system ("tar --version");
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36 if (status)
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37 error ("tar: Failed executing tar --version (status = %d)", status);
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38 endif
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39 cache = ! isempty (regexp (tar_ver_str, "bsdtar"));
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40 endif
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41 out = cache;
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42 endfunction