251 lines
8.7 KiB
Bash
Executable file
251 lines
8.7 KiB
Bash
Executable file
#!/bin/sh
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# Print a version string.
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scriptversion=2025-01-28.09; # UTC
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# Copyright (C) 2007-2025 Free Software Foundation, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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# This script is derived from GIT-VERSION-GEN from GIT: https://git-scm.com/.
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# It may be run in the following ways, presuming the script is invoked
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# like "./git-version-gen .tarball-version":
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#
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# - from a git repository in which the "git describe" command below
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# produces useful output (thus requiring at least one signed tag)
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#
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# - from a "make dist" non-git-repo directory containing a
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# .tarball-version file
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#
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# - from a "git archive" non-git-repo directory containing a
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# .tarball-version-git file
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# In order to use intra-version strings in your project, you will need some
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# separate generated version string files:
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#
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# .tarball-version - contains the version number assigned by the maintainer.
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# Present or missing in a checked-out repository, at the discretion of the
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# maintainer/contributor. Present in a distribution tarball, because the
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# tarball does not include the version control history.
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# Used by git-version-gen as an override.
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# Cannot be used in any dependencies (since it may be absent).
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# GNUmakefile has hooks to force a reconfigure at "make dist" time to get
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# the value correct, without penalizing normal development with extra
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# reconfigures.
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#
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# .tarball-version-git - a file committed to git containing a single
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# line with the string $Format:%(describe)$ and that the file is
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# marked in .gitattributes with ".tarball-version-git export-subst".
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# If the file doesn't exist or the export-subst keyword wasn't
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# effective, the file is ignored.
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#
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# Use the following snippet in your configure.ac, so that $(VERSION) will
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# automatically be up-to-date each time configure is run (and note that
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# since configure.ac no longer includes a version string, Makefile rules
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# should not depend on configure.ac for version updates).
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#
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# AC_INIT([@var{package}], [package])
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# AC_CONFIG_SRCDIR([@var{unique-file-in-source-dir}])
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# AC_CONFIG_AUX_DIR([build-aux])
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# VERSION_NUMBER=`cd $srcdir \
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# && build-aux/git-version-gen .tarball-version`
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# gl_INIT_PACKAGE_VERSION([$VERSION_NUMBER])
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# AM_INIT_AUTOMAKE([@var{options}])
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#
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# Then use the following lines in your Makefile.am, so that
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# .tarball-version will exist in distribution tarballs.
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#
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# dist-hook: dist-tarball-version
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# .PHONY: dist-tarball-version
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# dist-tarball-version:
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# echo '$(VERSION)' > $(distdir)/.tarball-version
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#
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# To setup support for "git archive" tarballs, use the following:
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#
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# echo '$Format:%(describe)$' > .tarball-version-git
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# echo '.tarball-version-git export-subst' >> .gitattributes
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# git add .tarball-version-git .gitattributes
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# git commit -m "Add .tarball-version-git for git-version-gen."
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me=$0
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year=`expr "$scriptversion" : '\([^-]*\)'`
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version="git-version-gen $scriptversion
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Copyright (C) ${year} Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law."
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usage="\
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Usage: $me [OPTION]... \$srcdir/.tarball-version [TAG-NORMALIZATION-SED-SCRIPT]
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Print a version string.
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Options:
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--prefix PREFIX prefix of git tags (default 'v')
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--fallback VERSION
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fallback version to use if \"git --version\" fails
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--help display this help and exit
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--version output version information and exit
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Send patches and bug reports to <bug-gnulib@gnu.org>."
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prefix=v
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fallback=
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while test $# -gt 0; do
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case $1 in
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--help) echo "$usage"; exit 0;;
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--version) echo "$version"; exit 0;;
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--prefix) shift; prefix=${1?};;
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--fallback) shift; fallback=${1?};;
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-*)
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echo "$0: Unknown option '$1'." >&2
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echo "$0: Try '--help' for more information." >&2
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exit 1;;
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*)
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if test "x$tarball_version_file" = x; then
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tarball_version_file="$1"
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elif test "x$tag_sed_script" = x; then
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tag_sed_script="$1"
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else
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echo "$0: extra non-option argument '$1'." >&2
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exit 1
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fi;;
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esac
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shift
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done
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if test "x$tarball_version_file" = x; then
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echo "$usage"
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exit 1
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fi
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tag_sed_script="${tag_sed_script:-s/x/x/}"
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nl='
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'
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# Avoid meddling by environment variable of the same name.
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v=
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v_from_git=
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# First see if there is a tarball-only version file.
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# then try "git describe", then default.
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if test -f "$tarball_version_file"
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then
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v=`cat "$tarball_version_file"` || v=
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case $v in
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*$nl*) v= ;; # reject multi-line output
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esac
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test "x$v" = x \
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&& echo "$0: WARNING: $tarball_version_file is damaged" 1>&2
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fi
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if test "x$v" != x
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then
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: # use $v
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# Otherwise, if there is at least one git commit involving the working
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# directory, and "git describe" output looks sensible, use that to
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# derive a version string.
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elif test "`git log -1 --pretty=format:x . 2>&1`" = x \
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&& v=`git describe --abbrev=4 --match="$prefix*" HEAD 2>/dev/null \
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|| git describe --abbrev=4 HEAD 2>/dev/null` \
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&& v=`printf '%s\n' "$v" | sed "$tag_sed_script"` \
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&& case $v in
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$prefix[0-9]*) ;;
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*) (exit 1) ;;
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esac
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then
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# Is this a new git that lists number of commits since the last
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# tag or the previous older version that did not?
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# Newer: v6.10-77-g0f8faeb
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# Older: v6.10-g0f8faeb
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vprefix=`expr "X$v" : 'X\(.*\)-g[^-]*$'` || vprefix=$v
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case $vprefix in
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*-*) : git describe is probably okay three part flavor ;;
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*)
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: git describe is older two part flavor
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# Recreate the number of commits and rewrite such that the
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# result is the same as if we were using the newer version
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# of git describe.
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vtag=`echo "$v" | sed 's/-.*//'`
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commit_list=`git rev-list "$vtag"..HEAD 2>/dev/null` \
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|| { commit_list=failed;
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echo "$0: WARNING: git rev-list failed" 1>&2; }
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numcommits=`echo "$commit_list" | wc -l`
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v=`echo "$v" | sed "s/\(.*\)-\(.*\)/\1-$numcommits-\2/"`;
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test "$commit_list" = failed && v=UNKNOWN
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;;
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esac
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v_from_git=1
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elif test "x$fallback" = x || git --version >/dev/null 2>&1; then
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v=UNKNOWN
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else
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v=$fallback
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fi
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if test "x$v" = xUNKNOWN \
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&& test -f "$tarball_version_file"-git \
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&& v=$(head -1 "$tarball_version_file"-git); then
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case $v in
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*Format*) v=UNKNOWN ;;
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esac
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fi
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# Change the penultimate "-" to ".", for version-comparing tools.
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# Remove the "g" to save a byte.
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v=`echo "$v" | sed 's/-\([^-]*\)-g\([^-]*\)$/.\1-\2/'`;
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v=`echo "$v" |sed "s/^$prefix//"`
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# The "-modified" suffix was previously called "-dirty". While this term
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# was invented by the git people to designate a checkout that is not "clean",
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# it has a negative connotation that is not in line with the fact that
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# a Free Software developer routinely works with modified source code.
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# In fact, modifying source code is the *essence* of Free Software.
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# What we need here is a term that is suitable for naming tarballs, without
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# shaming the developer. Giving a name to a tarball is something else than
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# describing the state of a git checkout.
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#
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# Test whether to append the "-modified" suffix only if the version
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# string we're using came from git. I.e., skip the test if it's "UNKNOWN"
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# or if it came from .tarball-version.
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if test "x$v_from_git" != x; then
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# Don't declare a version "modified" merely because a timestamp has changed.
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git update-index --refresh > /dev/null 2>&1
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modified=`exec 2>/dev/null;git diff-index --name-only HEAD` || modified=
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case "$modified" in
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'') ;;
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*) # Append the suffix only if there isn't one already.
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case $v in
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*-dirty | *-modified) ;;
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*) v="$v-modified" ;;
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esac ;;
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esac
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fi
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# Omit the trailing newline, so that m4_esyscmd can use the result directly.
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printf %s "$v"
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# Local variables:
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# eval: (add-hook 'before-save-hook 'time-stamp nil t)
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# time-stamp-start: "scriptversion="
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# time-stamp-format: "%:y-%02m-%02d.%02H"
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# time-stamp-time-zone: "UTC0"
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# time-stamp-end: "; # UTC"
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# End:
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