This file is indexed.

/etc/xen/scripts/qemu-ifup is in xen-utils-common 4.4.0-0ubuntu5.

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

echo -c 'config qemu network with xen bridge for '
echo $*

# Initialise a dummy MAC address. We choose the numerically
# largest non-broadcast address to prevent the address getting
# stolen by an Ethernet bridge for STP purposes.
# (FE:FF:FF:FF:FF:FF)
ip link set $1 address fe:ff:ff:ff:ff:ff || true

ifconfig $1 0.0.0.0 up
brctl addif $2 $1