local run_cache=$1

local baseline_cache=$2

local legacy_cache=$3

local donor_cache=$run_cache

if ! docker buildx imagetools inspect "$donor_cache" >/dev/null 2>&1; then

donor_cache=$baseline_cache

fi

if ! docker buildx imagetools inspect "$donor_cache" >/dev/null 2>&1; then

donor_cache=$legacy_cache

fi

printf '%s\n' "$donor_cache"