This file is indexed.

/etc/initramfs/post-update.d/zz-update-gummiboot is in gummiboot 48-1.

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
case "$DPKG_MAINTSCRIPT_PACKAGE" in
    linux-image-*)
        # update-gummiboot will be run by the kernel hooks later on
        exit 0
        ;;
    *)
        update-gummiboot "$1"
        ;;
esac