This file is indexed.

/etc/initramfs-tools/hooks/ltsp_nbd is in mythbuntu-diskless-client 0.9-0ubuntu1.

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/sh -e
# initramfs hook for nbd

MINKVER="2.6.17"
PREREQ=""

# Output pre-requisites
prereqs()
{
	echo "$PREREQ"
}

case "$1" in
    prereqs)
	prereqs
	exit 0
	;;
esac


. /usr/share/initramfs-tools/hook-functions

for X in squashfs unionfs nbd aufs; do 
    manual_add_modules "${x}"
done

# make sure all our modules are there
force_load nbd
force_load squashfs
force_load unionfs
force_load aufs

# Copy across the binaries
copy_exec /sbin/nbd-client /sbin
copy_exec /sbin/mkswap /sbin
copy_exec /sbin/swapon /sbin
copy_exec /usr/bin/tftp /bin