FFmpeg/version.sh

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#!/bin/sh
# check for git short hash
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if ! test "$revision"; then
revision=$(cd "$1" && git describe --tags --match N 2> /dev/null)
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test "$revision" && revision=git-$revision
fi
# no revision number found
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test "$revision" || revision=UNKNOWN
# releases extract the version number from the VERSION file
version=$(cd "$1" && cat VERSION 2> /dev/null)
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test "$version" || version=$revision
test -n "$3" && version=$version-$3
if [ -z "$2" ]; then
echo "$version"
exit
fi
NEW_REVISION="#define FFMPEG_VERSION \"$version\""
OLD_REVISION=$(cat version.h 2> /dev/null)
# Update version.h only on revision changes to avoid spurious rebuilds
if test "$NEW_REVISION" != "$OLD_REVISION"; then
echo "$NEW_REVISION" > "$2"
fi