This file is indexed.

/usr/lib/udisks/udisks-helper-mdadm-expand is in udisks 1.0.5-1+b1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash

set -e

MD_DEVICE=$1
shift

NEW_NUM_RAID_DEVICES=$1
shift

BACKUP_FILENAME=$1
shift

# TODO: disable bitmap if it exists and renable later

for device in "$@" ; do
    mdadm $MD_DEVICE --add $device
done

mdadm --grow $MD_DEVICE --raid-devices $NEW_NUM_RAID_DEVICES --backup-file "$BACKUP_FILENAME"