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				|  |  | +#!/bin/bash
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				|  |  | +
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				|  |  | +# Creates and updates the package_version information used by configure.ac
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				|  |  | +# (or other makefiles).  When run inside a git repository it will use the
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				|  |  | +# version information that can be queried from it unless AUTO_UPDATE is set
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				|  |  | +# to 'no'.  If no version is currently known it will be set to 'unknown'.
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				|  |  | +#
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				|  |  | +# If called with the argument 'release', the PACKAGE_VERSION will be updated
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				|  |  | +# even if AUTO_UPDATE=no, but the value of AUTO_UPDATE shall be preserved.
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				|  |  | +# This is used to force a version update whenever `make dist` is run.
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				|  |  | +#
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				|  |  | +# The exit status is 1 if package_version is not modified, else 0 is returned.
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				|  |  | +#
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				|  |  | +# This script should NOT be included in distributed tarballs, because if a
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				|  |  | +# parent directory contains a git repository we do not want to accidentally
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				|  |  | +# retrieve the version information from it instead.  Tarballs should ship
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				|  |  | +# with only the package_version file.
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				|  |  | +#
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				|  |  | +# Ron <ron@debian.org>, 2012.
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				|  |  | +
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				|  |  | +SRCDIR=$(dirname $0)
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				|  |  | +
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				|  |  | +if [ -e "$SRCDIR/package_version" ]; then
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				|  |  | +    . "$SRCDIR/package_version"
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				|  |  | +fi
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				|  |  | +
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				|  |  | +if [ "$AUTO_UPDATE" = no ]; then
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				|  |  | +    [ "$1" = release ] || exit 1
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				|  |  | +else
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				|  |  | +    AUTO_UPDATE=yes
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				|  |  | +fi
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				|  |  | +
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				|  |  | +# We run `git status` before describe here to ensure that we don't get a false
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				|  |  | +# -dirty from files that have been touched but are not actually altered in the
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				|  |  | +# working dir.
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				|  |  | +GIT_VERSION=$(cd "$SRCDIR" && git status > /dev/null 2>&1 \
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				|  |  | +                           && git describe --tags --match 'v*' --dirty 2> /dev/null)
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				|  |  | +GIT_VERSION=${GIT_VERSION#v}
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				|  |  | +
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				|  |  | +if [ -n "$GIT_VERSION" ]; then
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				|  |  | +
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				|  |  | +    [ "$GIT_VERSION" != "$PACKAGE_VERSION" ] || exit 1
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				|  |  | +    PACKAGE_VERSION="$GIT_VERSION"
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				|  |  | +
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				|  |  | +elif [ -z "$PACKAGE_VERSION" ]; then
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				|  |  | +    # No current package_version and no git ...
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				|  |  | +    # We really shouldn't ever get here, because this script should only be
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				|  |  | +    # included in the git repository, and should usually be export-ignored.
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				|  |  | +    PACKAGE_VERSION="unknown"
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				|  |  | +else
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				|  |  | +    exit 1
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				|  |  | +fi
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				|  |  | +
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				|  |  | +cat > "$SRCDIR/package_version" <<-EOF
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				|  |  | +	# Automatically generated by update_version.
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				|  |  | +	# This file may be sourced into a shell script or makefile.
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				|  |  | +
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				|  |  | +	# Set this to 'no' if you do not wish the version information
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				|  |  | +	# to be checked and updated for every build.  Most people will
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				|  |  | +	# never want to change this, it is an option for developers
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				|  |  | +	# making frequent changes that they know will not be released.
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				|  |  | +	AUTO_UPDATE=$AUTO_UPDATE
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				|  |  | +
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				|  |  | +	PACKAGE_VERSION="$PACKAGE_VERSION"
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				|  |  | +EOF
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