git-version-gen

   1 #!/bin/sh
   2 # Print a version string.
   3 scriptversion=2010-01-28.01
   4
   5 # Copyright (C) 2007-2010 Free Software Foundation, Inc.
   6 #
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 # This script is derived from GIT-VERSION-GEN from GIT: http://git.or.cz/.
  21 # It may be run two ways:
  22 # - from a git repository in which the "git describe" command below
  23 #   produces useful output (thus requiring at least one signed tag)
  24 # - from a non-git-repo directory containing a .tarball-version file, which
  25 #   presumes this script is invoked like "./git-version-gen .tarball-version".
  26
  27 # In order to use intra-version strings in your project, you will need two
  28 # separate generated version string files:
  29 #
  30 # .tarball-version - present only in a distribution tarball, and not in
  31 #   a checked-out repository.  Created with contents that were learned at
  32 #   the last time autoconf was run, and used by git-version-gen.  Must not
  33 #   be present in either $(srcdir) or $(builddir) for git-version-gen to
  34 #   give accurate answers during normal development with a checked out tree,
  35 #   but must be present in a tarball when there is no version control system.
  36 #   Therefore, it cannot be used in any dependencies.  GNUmakefile has
  37 #   hooks to force a reconfigure at distribution time to get the value
  38 #   correct, without penalizing normal development with extra reconfigures.
  39 #
  40 # .version - present in a checked-out repository and in a distribution
  41 #   tarball.  Usable in dependencies, particularly for files that don't
  42 #   want to depend on config.h but do want to track version changes.
  43 #   Delete this file prior to any autoconf run where you want to rebuild
  44 #   files to pick up a version string change; and leave it stale to
  45 #   minimize rebuild time after unrelated changes to configure sources.
  46 #
  47 # It is probably wise to add these two files to .gitignore, so that you
  48 # don't accidentally commit either generated file.
  49 #
  50 # Use the following line in your configure.ac, so that $(VERSION) will
  51 # automatically be up-to-date each time configure is run (and note that
  52 # since configure.ac no longer includes a version string, Makefile rules
  53 # should not depend on configure.ac for version updates).
  54 #
  55 # AC_INIT([GNU project],
  56 #         m4_esyscmd([build-aux/git-version-gen .tarball-version]),
  57 #         [bug-project@example])
  58 #
  59 # Then use the following lines in your Makefile.am, so that .version
  60 # will be present for dependencies, and so that .tarball-version will
  61 # exist in distribution tarballs.
  62 #
  63 # BUILT_SOURCES = $(top_srcdir)/.version
  64 # $(top_srcdir)/.version:
  65 #       echo $(VERSION) > $@-t && mv $@-t $@
  66 # dist-hook:
  67 #       echo $(VERSION) > $(distdir)/.tarball-version
  68
  69 case $# in
  70     1) ;;
  71     *) echo 1>&2 "Usage: $0 \$srcdir/.tarball-version"; exit 1;;
  72 esac
  73
  74 tarball_version_file=$1
  75 nl='
  76 '
  77
  78 # First see if there is a tarball-only version file.
  79 # then try "git describe", then default.
  80 if test -f $tarball_version_file
  81 then
  82     v=`cat $tarball_version_file` || exit 1
  83     case $v in
  84         *$nl*) v= ;; # reject multi-line output
  85         [0-9]*) ;;
  86         *) v= ;;
  87     esac
  88     test -z "$v" \
  89         && echo "$0: WARNING: $tarball_version_file seems to be damaged" 1>&2
  90 fi
  91
  92 if test -n "$v"
  93 then
  94     : # use $v
  95 elif
  96        v=`git describe --abbrev=4 --match='v*' HEAD 2>/dev/null \
  97           || git describe --abbrev=4 HEAD 2>/dev/null` \
  98     && case $v in
  99          [0-9]*) ;;
 100          v[0-9]*) ;;
 101          *) (exit 1) ;;
 102        esac
 103 then
 104     # Is this a new git that lists number of commits since the last
 105     # tag or the previous older version that did not?
 106     #   Newer: v6.10-77-g0f8faeb
 107     #   Older: v6.10-g0f8faeb
 108     case $v in
 109         *-*-*) : git describe is okay three part flavor ;;
 110         *-*)
 111             : git describe is older two part flavor
 112             # Recreate the number of commits and rewrite such that the
 113             # result is the same as if we were using the newer version
 114             # of git describe.
 115             vtag=`echo "$v" | sed 's/-.*//'`
 116             numcommits=`git rev-list "$vtag"..HEAD | wc -l`
 117             v=`echo "$v" | sed "s/\(.*\)-\(.*\)/\1-$numcommits-\2/"`;
 118             ;;
 119     esac
 120
 121     # Change the first '-' to a '.', so version-comparing tools work properly.
 122     # Remove the "g" in git describe's output string, to save a byte.
 123     v=`echo "$v" | sed 's/-/./;s/\(.*\)-g/\1-/'`;
 124 else
 125     v=UNKNOWN
 126 fi
 127
 128 v=`echo "$v" |sed 's/^v//'`
 129
 130 # Don't declare a version "dirty" merely because a time stamp has changed.
 131 git status > /dev/null 2>&1
 132
 133 dirty=`sh -c 'git diff-index --name-only HEAD' 2>/dev/null` || dirty=
 134 case "$dirty" in
 135     '') ;;
 136     *) # Append the suffix only if there isn't one already.
 137         case $v in
 138           *-dirty) ;;
 139           *) v="$v-dirty" ;;
 140         esac ;;
 141 esac
 142
 143 # Omit the trailing newline, so that m4_esyscmd can use the result directly.
 144 echo "$v" | tr -d '\012'
 145
 146 # Local variables:
 147 # eval: (add-hook 'write-file-hooks 'time-stamp)
 148 # time-stamp-start: "scriptversion="
 149 # time-stamp-format: "%:y-%02m-%02d.%02H"
 150 # time-stamp-end: "$"
 151 # End: