build-aux/git-version-gen

   1 #!/bin/sh
   2 # Print a version string.
   3 scriptversion=2019-10-13.15; # UTC
   4
   5 # Copyright (C) 2007-2020 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 <https://www.gnu.org/licenses/>.
  19
  20 # This script is derived from GIT-VERSION-GEN from GIT: https://git-scm.com/.
  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 # As with any generated file in a VC'd directory, you should add
  48 # /.version to .gitignore, so that you don't accidentally commit it.
  49 # .tarball-version is never generated in a VC'd directory, so needn't
  50 # be listed there.
  51 #
  52 # Use the following line in your configure.ac, so that $(VERSION) will
  53 # automatically be up-to-date each time configure is run (and note that
  54 # since configure.ac no longer includes a version string, Makefile rules
  55 # should not depend on configure.ac for version updates).
  56 #
  57 # AC_INIT([GNU project],
  58 #         m4_esyscmd([build-aux/git-version-gen .tarball-version]),
  59 #         [bug-project@example])
  60 #
  61 # Then use the following lines in your Makefile.am, so that .version
  62 # will be present for dependencies, and so that .version and
  63 # .tarball-version will exist in distribution tarballs.
  64 #
  65 # EXTRA_DIST = $(top_srcdir)/.version
  66 # BUILT_SOURCES = $(top_srcdir)/.version
  67 # $(top_srcdir)/.version:
  68 #       echo $(VERSION) > $@-t && mv $@-t $@
  69 # dist-hook:
  70 #       echo $(VERSION) > $(distdir)/.tarball-version
  71
  72
  73 me=$0
  74
  75 year=`expr "$scriptversion" : '\([^-]*\)'`
  76 version="git-version-gen $scriptversion
  77
  78 Copyright $year Free Software Foundation, Inc.
  79 There is NO warranty.  You may redistribute this software
  80 under the terms of the GNU General Public License.
  81 For more information about these matters, see the files named COPYING."
  82
  83 usage="\
  84 Usage: $me [OPTION]... \$srcdir/.tarball-version [TAG-NORMALIZATION-SED-SCRIPT]
  85 Print a version string.
  86
  87 Options:
  88
  89    --prefix PREFIX    prefix of git tags (default 'v')
  90    --fallback VERSION
  91                       fallback version to use if \"git --version\" fails
  92
  93    --help             display this help and exit
  94    --version          output version information and exit
  95
  96 Running without arguments will suffice in most cases."
  97
  98 prefix=v
  99 fallback=
 100
 101 while test $# -gt 0; do
 102   case $1 in
 103     --help) echo "$usage"; exit 0;;
 104     --version) echo "$version"; exit 0;;
 105     --prefix) shift; prefix=${1?};;
 106     --fallback) shift; fallback=${1?};;
 107     -*)
 108       echo "$0: Unknown option '$1'." >&2
 109       echo "$0: Try '--help' for more information." >&2
 110       exit 1;;
 111     *)
 112       if test "x$tarball_version_file" = x; then
 113         tarball_version_file="$1"
 114       elif test "x$tag_sed_script" = x; then
 115         tag_sed_script="$1"
 116       else
 117         echo "$0: extra non-option argument '$1'." >&2
 118         exit 1
 119       fi;;
 120   esac
 121   shift
 122 done
 123
 124 if test "x$tarball_version_file" = x; then
 125     echo "$usage"
 126     exit 1
 127 fi
 128
 129 tag_sed_script="${tag_sed_script:-s/x/x/}"
 130
 131 nl='
 132 '
 133
 134 # Avoid meddling by environment variable of the same name.
 135 v=
 136 v_from_git=
 137
 138 # First see if there is a tarball-only version file.
 139 # then try "git describe", then default.
 140 if test -f $tarball_version_file
 141 then
 142     v=`cat $tarball_version_file` || v=
 143     case $v in
 144         *$nl*) v= ;; # reject multi-line output
 145     esac
 146     test "x$v" = x \
 147         && echo "$0: WARNING: $tarball_version_file is damaged" 1>&2
 148 fi
 149
 150 if test "x$v" != x
 151 then
 152     : # use $v
 153 # Otherwise, if there is at least one git commit involving the working
 154 # directory, and "git describe" output looks sensible, use that to
 155 # derive a version string.
 156 elif test "`git log -1 --pretty=format:x . 2>&1`" = x \
 157     && v=`git describe --abbrev=4 --match="$prefix*" HEAD 2>/dev/null \
 158           || git describe --abbrev=4 HEAD 2>/dev/null` \
 159     && v=`printf '%s\n' "$v" | sed "$tag_sed_script"` \
 160     && case $v in
 161          $prefix[0-9]*) ;;
 162          *) (exit 1) ;;
 163        esac
 164 then
 165     # Is this a new git that lists number of commits since the last
 166     # tag or the previous older version that did not?
 167     #   Newer: v6.10-77-g0f8faeb
 168     #   Older: v6.10-g0f8faeb
 169     vprefix=`expr "X$v" : 'X\(.*\)-g[^-]*$'` || vprefix=$v
 170     case $vprefix in
 171         *-*) : git describe is probably okay three part flavor ;;
 172         *)
 173             : git describe is older two part flavor
 174             # Recreate the number of commits and rewrite such that the
 175             # result is the same as if we were using the newer version
 176             # of git describe.
 177             vtag=`echo "$v" | sed 's/-.*//'`
 178             commit_list=`git rev-list "$vtag"..HEAD 2>/dev/null` \
 179                 || { commit_list=failed;
 180                      echo "$0: WARNING: git rev-list failed" 1>&2; }
 181             numcommits=`echo "$commit_list" | wc -l`
 182             v=`echo "$v" | sed "s/\(.*\)-\(.*\)/\1-$numcommits-\2/"`;
 183             test "$commit_list" = failed && v=UNKNOWN
 184             ;;
 185     esac
 186
 187     # Change the penultimate "-" to ".", for version-comparing tools.
 188     # Remove the "g" to save a byte.
 189     v=`echo "$v" | sed 's/-\([^-]*\)-g\([^-]*\)$/.\1-\2/'`;
 190     v_from_git=1
 191 elif test "x$fallback" = x || git --version >/dev/null 2>&1; then
 192     v=UNKNOWN
 193 else
 194     v=$fallback
 195 fi
 196
 197 v=`echo "$v" |sed "s/^$prefix//"`
 198
 199 # Test whether to append the "-dirty" suffix only if the version
 200 # string we're using came from git.  I.e., skip the test if it's "UNKNOWN"
 201 # or if it came from .tarball-version.
 202 if test "x$v_from_git" != x; then
 203   # Don't declare a version "dirty" merely because a timestamp has changed.
 204   git update-index --refresh > /dev/null 2>&1
 205
 206   dirty=`exec 2>/dev/null;git diff-index --name-only HEAD` || dirty=
 207   case "$dirty" in
 208       '') ;;
 209       *) # Append the suffix only if there isn't one already.
 210           case $v in
 211             *-dirty) ;;
 212             *) v="$v-dirty" ;;
 213           esac ;;
 214   esac
 215 fi
 216
 217 # Omit the trailing newline, so that m4_esyscmd can use the result directly.
 218 printf %s "$v"
 219
 220 # Local variables:
 221 # eval: (add-hook 'before-save-hook 'time-stamp)
 222 # time-stamp-start: "scriptversion="
 223 # time-stamp-format: "%:y-%02m-%02d.%02H"
 224 # time-stamp-time-zone: "UTC0"
 225 # time-stamp-end: "; # UTC"
 226 # End: