This file is indexed.

/usr/share/initramfs-tools/scripts/casper-bottom/40install_driver_updates is in casper 1.394.

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

PREREQ=""
DESCRIPTION="Installing driver updates..."

prereqs()
{
       echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
       prereqs
       exit 0
       ;;
esac

. /scripts/casper-functions

if [ ! -d /tmp/driver-updates ]; then
	exit 0
fi

log_begin_msg "$DESCRIPTION"

install_dir=/var/cache/driver-updates

mkdir "/root$install_dir"
cp -a /tmp/driver-updates/*.deb "/root$install_dir/"

# We cannot leave packages in a bad state. So if the install fails, remove
# it. This will get caught in casper.log.
for deb in "/root$install_dir"/*; do
	[ -f "$deb" ] || continue
	debbase="${deb##*/}"
	DEBIAN_HAS_FRONTEND= DEBCONF_REDIR= \
	DEBIAN_FRONTEND=noninteractive \
	chroot /root dpkg -i "$install_dir/$debbase"
	ret=$?
	if [ $ret != 0 ]; then
		DEBIAN_HAS_FRONTEND= DEBCONF_REDIR= \
		DEBIAN_FRONTEND=noninteractive \
		chroot /root dpkg -P "${debbase%%_*}"
	fi
done

log_end_msg