improved…

source_informations.sh.in
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			#!/usr/bin/env bash
			set -euo pipefail

			GIT=@GIT_EXECUTABLE@
			SOURCE_DIR=@PROJECT_SOURCE_DIR@
			OUTPUT_FILE=@OUTPUT_FILE@
			UUENCODE=@UUENCODE_EXECUTABLE@

			set -x

			GIT_VERSION=$(${GIT} describe --always --dirty)
			GIT_BRANCH=$(${GIT} rev-parse --abbrev-ref --symbolic-full-name @)
			GIT_REMOTE_BRANCH=$(${GIT} rev-parse --abbrev-ref --symbolic-full-name @{upstream})
			GIT_REMOTE=$(git config branch.$GIT_BRANCH.remote)
			GIT_REMOTE_URL=$(${GIT} config remote.$GIT_REMOTE.url)
			GIT_DIFF=$(${GIT} diff @ \| sed '1h;1!H;$!d;x;s/\n/\\n/g; s/'\''/\'\''/g; s/"/\\"/g')

			set +x

			cat <<EOF > ${OUTPUT_FILE}
			#include <string>

			auto @PROJECT_NAME@_GIT_VERSION = "${GIT_VERSION}";
			auto @PROJECT_NAME@_GIT_BRANCH = "${GIT_BRANCH}";
			auto @PROJECT_NAME@_GIT_REMOTE_BRANCH = "${GIT_REMOTE_BRANCH}";
			auto @PROJECT_NAME@_GIT_REMOTE_URL = "${GIT_REMOTE_URL}";
			auto @PROJECT_NAME@_GIT_DIFF = "${GIT_DIFF}";
			EOF