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init: fix bashism

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -628,8 +628,7 @@

 elif is_url "$KOPT_apkovl"; then

 	# Fetch apkovl via network

 	MACHINE_UUID=$(cat /sys/class/dmi/id/product_uuid 2>/dev/null)

-	url="${KOPT_apkovl/{MAC\}/$MAC_ADDRESS}"

-	url="${url/{UUID\}/$MACHINE_UUID}"

+	url="$(echo "$KOPT_apkovl" | sed -e "s/{MAC}/$MAC_ADDRESS/" -e "s/{UUID}/$MACHINE_UUID/")"

 	ovl=/tmp/${url##*/}

 	wget -O "$ovl" "$url" || ovl=

 else