repopulate_cache() {
	# populate the cache with what is needed for do_compile
	${GO} clean -modcache
	go_do_compile
}

update_modules_srcuri() {
	dldir="${GOMODCACHE}/cache/download/"
	find $dldir -name "*.zip" | sort > ${B}/.go-modules
	modsfile="${THISDIR}/${BPN}-go-mods.inc"

	echo "# Autogenerated with 'bitbake -c update_modules ${PN}'\n" > $modsfile
	echo 'SRC_URI += "\' >> $modsfile
	while read -r zip; do
		sha256="$(sha256sum $zip | awk '{ print $1; }')"
		zip=$(realpath --relative-to=$dldir $zip)
		url=$(echo $zip | awk -F '/@v/' '{print $1}')
		url=$(echo $url | sed -e 's/\![a-z]/\U&/g' -e 's/!//g')
		version=$(echo $zip |  awk -F '/@v/' '{print $2}')
		version="${version%.zip}"
		echo "    gomod://$url;version=$version;sha256sum=$sha256 \\" >> $modsfile
	done < ${B}/.go-modules
	echo '"' >> $modsfile
}

update_license_files() {
	licdir="${GOMODCACHE}"
	find $licdir -name LICENSE | sort > ${B}/.go-mod-licenses

	licgen="${THISDIR}/${BPN}-licenses.inc"
	echo "# Autogenerated with 'bitbake -c update_modules ${PN}'\n" > $licgen
	echo 'LIC_FILES_CHKSUM += " \' >> $licgen
	while read -r licfile; do
		echo $licfile
		relpath="$(realpath --relative-to=$licdir $licfile)"
		md5=$(md5sum $licfile | awk '{ print $1; }')

		# these are two lines to prevent bitbake expanding the variable, the must be a better way
		echo -n "    file://$" >> $licgen
		echo "{GOMODCACHE}/$relpath;md5=$md5 \\" >> $licgen

		license="$(sed -En "s/^$md5,([^,]+),?/\\1/p" ${THISDIR}/${BPN}-license-md5.csv)"
		if [ "$license" = "" ]; then
			bbwarn "Unknown license: $licfile"
		fi

		if echo "$license" | grep ' '; then
			license="($license)"
		fi

		if [ "$usedlic" = "" ]; then
			usedlic="$license"
		else
			usedlic="$usedlic\n$license"
		fi

	done < ${B}/.go-mod-licenses
	echo '"' >> $licgen

	usedlic="$(echo $usedlic | sort -u | awk '{printf " & %s", $0}')"
	echo >> $licgen
	echo "LICENSE += \"$usedlic\"" >> $licgen
}

RECIPE_UPGRADE_EXTRA_TASKS += "do_update_modules"

addtask do_update_modules after do_configure
do_update_modules[nostamp] = "1"
do_update_modules[network] = "1"
do_update_modules[dirs] = "${GOTMPDIR} ${B}/src/${GO_WORKDIR}"

do_update_modules() {
	repopulate_cache
	update_modules_srcuri
	update_license_files
}