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annotate build-aux/git-version-gen @ 9748:c0c8409cb7a2

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* build-aux/git-version-gen: Adjust a comment and the Usage string. Signed-off-by: Jim Meyering <meyering@redhat.com>
author Jim Meyering <meyering@redhat.com>
date Sun, 02 Mar 2008 17:19:20 +0100
parents ec87f62b97b8
children ea0eb05ec88d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/bin/sh
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2 # Print a version string.
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3 scriptversion=2008-03-02.16
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4
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5 # Copyright (C) 2007 Free Software Foundation
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6 #
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7 # This program is free software; you can redistribute it and/or modify
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8 # it under the terms of the GNU General Public License as published by
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9 # the Free Software Foundation; either version 3, or (at your option)
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10 # any later version.
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11 #
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU General Public License for more details.
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16 #
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17 # You should have received a copy of the GNU General Public License
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18 # along with this program; if not, write to the Free Software
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19 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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20 # 02110-1301, USA.
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21
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22 # This script is derived from GIT-VERSION-GEN from GIT: http://git.or.cz/.
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23 # It may be run two ways:
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24 # - from a git repository in which the "git describe" command below
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25 # produces useful output (thus requiring at least one signed tag)
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26 # - from a non-git-repo directory containing a .tarball-version file, which
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27 # presumes this script is invoked like "./git-version-gen .tarball-version".
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28
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29 case $# in
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30 1) ;;
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31 *) echo 1>&2 "Usage: $0 \$srcdir/.tarball-version"; exit 1;;
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32 esac
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33
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34 tarball_version_file=$1
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35 nl='
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36 '
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37
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38 # First see if there is a tarball-only version file.
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39 # then try "git describe", then default.
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40 if test -f $tarball_version_file
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41 then
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42 v=`cat $tarball_version_file` || exit 1
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43 case $v in
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44 *$nl*) v= ;; # reject multi-line output
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45 [0-9]*) ;;
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46 *) v= ;;
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47 esac
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48 test -z "$v" \
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49 && echo "$0: WARNING: $tarball_version_file seems to be damaged" 1>&2
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50 fi
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51
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52 if test -n "$v"
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53 then
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54 : # use $v
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55 elif test -d .git \
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56 && v=`git describe --abbrev=4 HEAD 2>/dev/null` \
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57 && case $v in
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58 v[0-9]*) ;;
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59 *) (exit 1) ;;
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60 esac
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61 then
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62 # Is this a new git that lists number of commits since the last
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63 # tag or the previous older version that did not?
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64 # Newer: v6.10-77-g0f8faeb
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65 # Older: v6.10-g0f8faeb
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66 case $v in
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67 *-*-*) : git describe is okay three part flavor ;;
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68 *-*)
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69 : git describe is older two part flavor
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70 # Recreate the number of commits and rewrite such that the
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71 # result is the same as if we were using the newer version
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72 # of git describe.
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73 vtag=`echo "$v" | sed 's/-.*//'`
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74 numcommits=`git rev-list "$vtag"..HEAD | wc -l`
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75 v=`echo "$v" | sed "s/\(.*\)-\(.*\)/\1-$numcommits-\2/"`;
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76 ;;
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77 esac
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78
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79 # Change the first '-' to a '.', so version-comparing tools work properly.
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80 # Remove the "g" in git describe's output string, to save a byte.
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81 v=`echo "$v" | sed 's/-/./;s/\(.*\)-g/\1-/'`;
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82 else
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83 v=UNKNOWN
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84 fi
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85
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86 v=`echo "$v" |sed 's/^v//'`
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87
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88 # Don't declare a version "dirty" merely because a time stamp has changed.
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89 git status > /dev/null 2>&1
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90
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91 dirty=`sh -c 'git diff-index --name-only HEAD' 2>/dev/null` || dirty=
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92 case "$dirty" in
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93 '') ;;
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94 *) # Append the suffix only if there isn't one already.
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95 case $v in
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96 *-dirty) ;;
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97 *) v="$v-dirty" ;;
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98 esac ;;
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99 esac
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100
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101 # Omit the trailing newline, so that m4_esyscmd can use the result directly.
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102 echo "$v" | tr -d '\012'
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103
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104 # Local variables:
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105 # eval: (add-hook 'write-file-hooks 'time-stamp)
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106 # time-stamp-start: "scriptversion="
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107 # time-stamp-format: "%:y-%02m-%02d.%02H"
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108 # time-stamp-end: "$"
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109 # End: