This file is indexed.

/usr/share/live/build/hooks/0310-update-apt-xapian-index.chroot is in live-build 3.0.5-1.

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The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

# Update the Apt Xapian index.
#
# The package would do this itself, but (a) it checks policy-rc.d which says it
# is not allowed to, and (b) it wants to build the index in the background which
# will be racy in the context of live-build.

if [ -x /usr/sbin/update-apt-xapian-index ]
then
	PYTHONDONTWRITEBYTECODE=1 /usr/sbin/update-apt-xapian-index --force --quiet
fi