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# Print a version string.
scriptversion=2011-02-19.19; # UTC
# Copyright (C) 2007-2011 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <>.
# This script is derived from GIT-VERSION-GEN from GIT:
# It may be run two ways:
# - from a git repository in which the "git describe" command below
# produces useful output (thus requiring at least one signed tag)
# - from a non-git-repo directory containing a .tarball-version file, which
# presumes this script is invoked like "./git-version-gen .tarball-version".
# In order to use intra-version strings in your project, you will need two
# separate generated version string files:
# .tarball-version - present only in a distribution tarball, and not in
# a checked-out repository. Created with contents that were learned at
# the last time autoconf was run, and used by git-version-gen. Must not
# be present in either $(srcdir) or $(builddir) for git-version-gen to
# give accurate answers during normal development with a checked out tree,
# but must be present in a tarball when there is no version control system.
# Therefore, it cannot be used in any dependencies. GNUmakefile has
# hooks to force a reconfigure at distribution time to get the value
# correct, without penalizing normal development with extra reconfigures.
# .version - present in a checked-out repository and in a distribution
# tarball. Usable in dependencies, particularly for files that don't
# want to depend on config.h but do want to track version changes.
# Delete this file prior to any autoconf run where you want to rebuild
# files to pick up a version string change; and leave it stale to
# minimize rebuild time after unrelated changes to configure sources.
# It is probably wise to add these two files to .gitignore, so that you
# don't accidentally commit either generated file.
# Use the following line in your, so that $(VERSION) will
# automatically be up-to-date each time configure is run (and note that
# since no longer includes a version string, Makefile rules
# should not depend on for version updates).
# AC_INIT([GNU project],
# m4_esyscmd([build-aux/git-version-gen .tarball-version]),
# [bug-project@example])
# Then use the following lines in your, so that .version
# will be present for dependencies, and so that .tarball-version will
# exist in distribution tarballs.
# BUILT_SOURCES = $(top_srcdir)/.version
# $(top_srcdir)/.version:
# echo $(VERSION) > $@-t && mv $@-t $@
# dist-hook:
# echo $(VERSION) > $(distdir)/.tarball-version
case $# in
1|2) ;;
*) echo 1>&2 "Usage: $0 \$srcdir/.tarball-version" \
exit 1;;
# Avoid meddling by environment variable of the same name.
# First see if there is a tarball-only version file.
# then try "git describe", then default.
if test -f $tarball_version_file
v=`cat $tarball_version_file` || v=
case $v in
*$nl*) v= ;; # reject multi-line output
[0-9]*) ;;
*) v= ;;
test -z "$v" \
&& echo "$0: WARNING: $tarball_version_file is missing or damaged" 1>&2
if test -n "$v"
: # use $v
# Otherwise, if there is at least one git commit involving the working
# directory, and "git describe" output looks sensible, use that to
# derive a version string.
elif test "`git log -1 --pretty=format:x . 2>&1`" = x \
&& v=`git describe --abbrev=4 --match='v*' HEAD 2>/dev/null \
|| git describe --abbrev=4 HEAD 2>/dev/null` \
&& v=`printf '%s\n' "$v" | sed "$tag_sed_script"` \
&& case $v in
v[0-9]*) ;;
*) (exit 1) ;;
# Is this a new git that lists number of commits since the last
# tag or the previous older version that did not?
# Newer: v6.10-77-g0f8faeb
# Older: v6.10-g0f8faeb
case $v in
*-rc[0-9]) ;; # release candidate
*-*-*) : git describe is okay three part flavor ;;
: git describe is older two part flavor
# Recreate the number of commits and rewrite such that the
# result is the same as if we were using the newer version
# of git describe.
vtag=`echo "$v" | sed 's/-.*//'`
commit_list=`git rev-list "$vtag"..HEAD 2>/dev/null` \
|| { commit_list=failed;
echo "$0: WARNING: git rev-list failed" 1>&2; }
numcommits=`echo "$commit_list" | wc -l`
v=`echo "$v" | sed "s/\(.*\)-\(.*\)/\1-$numcommits-\2/"`;
test "$commit_list" = failed && v=UNKNOWN
case $v in
# Remove the "g" in git describe's output string, to save a byte.
v=`echo "$v" | sed 's/\(.*\)-g/\1-/'`;
# Change the first '-' to a '.', so version-comparing tools work properly.
# Remove the "g" in git describe's output string, to save a byte.
v=`echo "$v" | sed 's/-/./;s/\(.*\)-g/\1-/'`;
v=`echo "$v" |sed 's/^v//'`
# Test whether to append the "-dirty" suffix only if the version
# string we're using came from git. I.e., skip the test if it's "UNKNOWN"
# or if it came from .tarball-version.
if test -n "$v_from_git"; then
# Don't declare a version "dirty" merely because a time stamp has changed.
git update-index --refresh > /dev/null 2>&1
dirty=`exec 2>/dev/null;git diff-index --name-only HEAD` || dirty=
case "$dirty" in
'') ;;
*) # Append the suffix only if there isn't one already.
case $v in
*-dirty) ;;
*) v="$v-dirty" ;;
esac ;;
# Omit the trailing newline, so that m4_esyscmd can use the result directly.
echo "$v" | tr -d "$nl"
# Local variables:
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "scriptversion="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-time-zone: "UTC"
# time-stamp-end: "; # UTC"
# End:
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