This file is indexed.

/etc/initramfs-tools/scripts/init-top/xo1 is in olpc-xo1-hw 0.3.

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

#
# List the soft prerequisites here.  This is a space separated list of
# names, of scripts that are in the same directory as this one, that
# must be run before this one can be.
#
PREREQ=""

prereqs()
{
        echo "$PREREQ"
}

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

# redboot needs to be loaded before cafe_nand in order to ensure that
# partitions are correctly identified.  This is a kernel bug that's worked
# around here.
modprobe redboot

# XXX: this can be removed in wheezy; Linux-3.2 fixes the redboot bug that
# requires this hack.