1#!/bin/bash
2
3# Creates and updates the package_version information used by configure.ac
4# (or other makefiles).  When run inside a git repository it will use the
5# version information that can be queried from it unless AUTO_UPDATE is set
6# to 'no'.  If no version is currently known it will be set to 'unknown'.
7#
8# If called with the argument 'release', the PACKAGE_VERSION will be updated
9# even if AUTO_UPDATE=no, but the value of AUTO_UPDATE shall be preserved.
10# This is used to force a version update whenever `make dist` is run.
11#
12# The exit status is 1 if package_version is not modified, else 0 is returned.
13#
14# This script should NOT be included in distributed tarballs, because if a
15# parent directory contains a git repository we do not want to accidentally
16# retrieve the version information from it instead.  Tarballs should ship
17# with only the package_version file.
18#
19# Ron <ron@debian.org>, 2012.
20
21SRCDIR=$(dirname $0)
22
23if [ -e "$SRCDIR/package_version" ]; then
24    . "$SRCDIR/package_version"
25fi
26
27if [ "$AUTO_UPDATE" = no ]; then
28    [ "$1" = release ] || exit 1
29else
30    AUTO_UPDATE=yes
31fi
32
33# We run `git status` before describe here to ensure that we don't get a false
34# -dirty from files that have been touched but are not actually altered in the
35# working dir.
36GIT_VERSION=$(cd "$SRCDIR" && git status > /dev/null 2>&1 \
37                           && git describe --tags --match 'v*' --dirty 2> /dev/null)
38GIT_VERSION=${GIT_VERSION#v}
39
40if [ -n "$GIT_VERSION" ]; then
41
42    [ "$GIT_VERSION" != "$PACKAGE_VERSION" ] || exit 1
43    PACKAGE_VERSION="$GIT_VERSION"
44
45elif [ -z "$PACKAGE_VERSION" ]; then
46    # No current package_version and no git ...
47    # We really shouldn't ever get here, because this script should only be
48    # included in the git repository, and should usually be export-ignored.
49    PACKAGE_VERSION="unknown"
50else
51    exit 1
52fi
53
54cat > "$SRCDIR/package_version" <<-EOF
55	# Automatically generated by update_version.
56	# This file may be sourced into a shell script or makefile.
57
58	# Set this to 'no' if you do not wish the version information
59	# to be checked and updated for every build.  Most people will
60	# never want to change this, it is an option for developers
61	# making frequent changes that they know will not be released.
62	AUTO_UPDATE=$AUTO_UPDATE
63
64	PACKAGE_VERSION="$PACKAGE_VERSION"
65EOF
66