This file is indexed.

/etc/apt/apt-file.conf is in apt-file 2.5.5ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Apt-file configuration file

# Substitutions are made as follows:
#	host => remote hostname
#	port => remote port
#	uri => complete URI from sources.list
#	path => path from /
#	dist => the distribution name
#	cache => path to the local cache dir
#	dest => the destination file name inside the cache dir
#	cdrom => cdrom mount point

# Where are located Packages
destination = <host>_<path>_dists_<dist>_Contents-<arch>.gz

# common code blocks can be defined as variables and be used as $check_cmd, etc. later
check_cmd = ( ( gunzip -l "<cache>/<dest>_tmp" >/dev/null 2>&1 || (echo "File is not gzipped."; false) ) && mv "<cache>/<dest>_tmp" "<cache>/<dest>" 2>&1 )
error_cmd = ( rm -f "<cache>/<dest>_tmp"; echo "Can't get <uri>/dists/<dist>/Contents-<arch>.gz" )
post_dl_cmd = $check_cmd || $error_cmd 


# Fetch methods using diffindex-download:
# -i : ignore missing files
# -q : be quiet
# -n <num> : download full file if more than <num> patches would be necessary
http = diffindex-download -i "<uri>/dists/<dist>/Contents-<arch>.gz" <cache>/<dest>
https = diffindex-download -i "<uri>/dists/<dist>/Contents-<arch>.gz" <cache>/<dest>
ftp = diffindex-download -i "<uri>/dists/<dist>/Contents-<arch>.gz" <cache>/<dest>
# In debtorrent URLs, we have to replace 'debtorrent' by 'http', and we always download the full file
debtorrent = diffindex-download -i -n 0 "http://<host>:<port|9988><path>/dists/<dist>/Contents-<arch>.gz" <cache>/<dest>

ssh = scp -P <port|22> "<user>@<host>:/<path>/dists/<dist>/Contents-<arch>.gz" "<cache>/<dest>_tmp" && $post_dl_cmd
rsh = rcp -l <user> "<host>:/<path>/dists/<dist>/Contents-<arch>.gz" "<cache>/<dest>_tmp" && $post_dl_cmd
file = cp "/<path>/dists/<dist>/Contents-<arch>.gz" "<cache>/<dest>"
copy = cp "/<path>/dists/<dist>/Contents-<arch>.gz" "<cache>/<dest>"
cdrom = echo "Put CDROM labeled <path> in the cdrom device and press [ENTER]" > /dev/stderr ; read DUMMY ; mount "<cdrom>"; cp "<cdrom>/dists/<dist>/Contents-<arch>.gz" "<cache>/<dest>" ; umount "<cdrom>"

# Schemes that might require user input on 'apt-file update'
# These will be skipped if -N is given
interactive = cdrom rsh ssh