GIT-VERSION-GEN 752 Bytes
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#!/bin/sh

GVF=GIT-VERSION-FILE
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DEF_VER=v2.19.1
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LF='
'

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# First see if there is a version file (included in release tarballs),
# then try git-describe, then default.
if test -f version
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then
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	VN=$(cat version) || VN="$DEF_VER"
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elif test -d ${GIT_DIR:-.git} -o -f .git &&
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	VN=$(git describe --match "v[0-9]*" HEAD 2>/dev/null) &&
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	case "$VN" in
	*$LF*) (exit 1) ;;
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	v[0-9]*)
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		git update-index -q --refresh
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		test -z "$(git diff-index --name-only HEAD --)" ||
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		VN="$VN-dirty" ;;
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	esac
then
	VN=$(echo "$VN" | sed -e 's/-/./g');
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else
	VN="$DEF_VER"
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fi
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VN=$(expr "$VN" : v*'\(.*\)')
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if test -r $GVF
then
	VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)
else
	VC=unset
fi
test "$VN" = "$VC" || {
	echo >&2 "GIT_VERSION = $VN"
	echo "GIT_VERSION = $VN" >$GVF
}