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annotate build-aux/get-source-mtime.sh @ 27919:1891570abac8

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update Octave Project Developers copyright for the new year In files that have the "Octave Project Developers" copyright notice, update for 2020.
author John W. Eaton <jwe@octave.org>
date Mon, 06 Jan 2020 22:29:51 -0500
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1 #! /bin/sh
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2 #
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3 # Copyright (C) 2017-2020 The Octave Project Developers
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4 #
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5 # See the file COPYRIGHT.md in the top-level directory of this distribution
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6 # or <https://octave.org/COPYRIGHT.html/>.
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7 #
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8 #
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9 # This file is part of Octave.
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10 #
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11 # Octave is free software: you can redistribute it and/or modify it
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12 # under the terms of the GNU General Public License as published by
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13 # the Free Software Foundation, either version 3 of the License, or
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14 # (at your option) any later version.
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15 #
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16 # Octave is distributed in the hope that it will be useful, but
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17 # WITHOUT ANY WARRANTY; without even the implied warranty of
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18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 # GNU General Public License for more details.
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20 #
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21 # You should have received a copy of the GNU General Public License
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22 # along with Octave; see the file COPYING. If not, see
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23 # <https://www.gnu.org/licenses/>.
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24
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25 # Generate a timestamp that best represents the last modification time
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26 # of this source tree. The time value is printed on stdout in units of
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27 # time_t. If a reasonable representation of the source tree last
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28 # modification time can't be determined, then the current system time is
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29 # printed instead. A valid time_t value is always printed on stdout.
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30
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31 set -e
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32
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33 PERL=${PERL:-perl}
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34 SED=${SED:-sed}
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35
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36 if [ $# -ne 1 ]; then
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37 echo "usage: get-source-mtime.sh SRCDIR" 1>&2
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38 exit 1
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39 fi
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40
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41 srcdir="$1"
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42
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43 ## A user's ~/.hgrc may redefine or add default options to any hg subcommand,
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44 ## potentially altering its behavior and possibly its standard output. Always
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45 ## run hg subcommands with configuration variables set to ensure that the
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46 ## user's preferences do not influence the expected behavior.
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47 hg_safe ()
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48 {
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49 cmd=$1; shift
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50 hg --config alias.${cmd}=${cmd} --config defaults.${cmd}= ${cmd} "$@"
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51 }
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52
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53 if [ x"$SOURCE_DATE_EPOCH" != x ]; then
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54 # Allow the source modification time to be overridden by SOURCE_DATE_EPOCH
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55 t=$SOURCE_DATE_EPOCH
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56 elif [ -d $srcdir/.hg ]; then
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57 t=$( cd $srcdir && hg_safe log --rev . --template '{date|hgdate}' )
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58 t=$( echo $t | $SED -n 's/^\([0-9]\+\) .*/\1/p' )
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59 elif [ -f $srcdir/HG-ID ]; then
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60 t=$( $PERL -e '@s = stat($ARGV[0]); print($s[9]) if @s;' $srcdir/HG-ID )
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61 elif [ -f $srcdir/configure ]; then
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62 t=$( $PERL -e '@s = stat($ARGV[0]); print($s[9]) if @s;' $srcdir/configure )
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63 fi
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64
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65 if [ x"$t" = x ]; then
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66 t=$( date +%s )
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67 fi
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68
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69 echo $t