git

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#!/bin/sh
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GVF=GIT-VERSION-FILE
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DEF_VER=v2.46.GIT
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LF='
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'
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# First see if there is a version file (included in release tarballs),
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# then try git-describe, then default.
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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 "${GIT_DIR:-.git}" || test -f .git; } &&
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	VN=$(git describe --match "v[0-9]*" HEAD 2>/dev/null) &&
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	case "$VN" in
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	*$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
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then
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	VN=$(echo "$VN" | sed -e 's/-/./g');
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else
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	VN="$DEF_VER"
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fi
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VN=$(expr "$VN" : v*'\(.*\)')
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if test -r $GVF
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then
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	VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)
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else
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	VC=unset
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fi
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test "$VN" = "$VC" || {
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	echo >&2 "GIT_VERSION = $VN"
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	echo "GIT_VERSION = $VN" >$GVF
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}
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