singularity-tools: proper line looping with while-read

            # Build /bin and copy across closure

            mkdir -p bin ./${builtins.storeDir}

            for f in $(cat "$layerClosure") ; do

            # Loop over the line-separated paths in $layerClosure

            while IFS= read -r f; do

              cp -ar "$f" "./$f"

            done

            done < "$layerClosure"

            # TODO(@ShamrockLee):

            # Once vmTools.runInLinuxVMm works with `__structuredAttrs = true` (#334705),