This file is indexed.

/etc/resolvconf/update-libc.d/postfix is in postfix 2.11.0-1.

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 -e

# we only need to copy this in if the service is already running.
# if it's not running, it'll get picked up by the init script on start.
/etc/init.d/postfix status >/dev/null 2>&1 || exit 0

QUEUEDIR="$(/usr/sbin/postconf -h queue_directory 2>/dev/null || true)"
if [ -n "$QUEUEDIR" ]; then
    cp /etc/resolv.conf ${QUEUEDIR}/etc/resolv.conf
    /etc/init.d/postfix reload >/dev/null 2>&1 || exit 0
fi

exit 0