This file is indexed.

/usr/share/chiark-backup/snap-drop is in chiark-backup 4.4.2.

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
set -e
vd=/var/lib/chiark-backup
if [ "x$1" != "x" ]; then
	vd="$1"; shift
fi
cd "$vd"
test -f snap-drop || exit 0
sh -x snap-drop || true
rm snap-drop