/etc/cron.daily/locate is in locate 4.6.0+git+20160126-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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set -e
# cron script to update the `locatedb' database.
#
# Written by Ian A. Murdock <imurdock@debian.org> and
# Kevin Dalley <kevin@aimnet.com>
# Please consult updatedb(1) and /usr/share/doc/locate/README.Debian
[ -e /usr/bin/updatedb.findutils ] || exit 0
if [ "$(id -u)" != "0" ]; then
echo "You must be root."
exit 1
fi
# Global options for invocations of find(1)
FINDOPTIONS='-ignore_readdir_race'
# filesystems which are pruned from updatedb database
PRUNEFS="NFS nfs nfs4 afs binfmt_misc proc smbfs autofs iso9660 ncpfs coda devpts ftpfs devfs mfs shfs sysfs cifs lustre_lite tmpfs usbfs udf ocfs2"
# paths which are pruned from updatedb database
PRUNEPATHS="/tmp /usr/tmp /var/tmp /afs /amd /alex /var/spool /sfs /media /var/lib/schroot/mount"
# netpaths which are added
NETPATHS=""
# run find as this user
LOCALUSER="nobody"
# cron.daily/find: run at this priority -- higher number means lower priority
# (this is relative to the default which cron sets, which is usually +5)
NICE=10
# I/O priority
# 1 for real time, 2 for best-effort, 3 for idle ("3" only allowed for root)
IONICE_CLASS=3
# 0-7 (only valid for IONICE_CLASS 1 and 2), 0=highest, 7=lowest
IONICE_PRIORITY=7
# allow keeping local customizations in a separate file
if [ -r /etc/updatedb.findutils.cron.local ] ; then
. /etc/updatedb.findutils.cron.local
fi
export FINDOPTIONS PRUNEFS PRUNEPATHS NETPATHS LOCALUSER
# Set the task to run with desired I/O priority if possible
# Linux supports io scheduling priorities and classes since
# 2.6.13 with the CFQ io scheduler
if [ -x /usr/bin/ionice ] && [ "${UPDATDB_NO_IONICE}" = "" ]; then
# don't run ionice if kernel version < 2.6.13
KVER=$(uname -r)
case "$KVER" in
2.[012345]*) ;;
2.6.[0-9]) ;;
2.6.[0-9].*) ;;
2.6.1[012]*) ;;
*)
# Avoid providing "-n" when IONICE_CLASS isn't 1 or 2
case "$IONICE_CLASS" in
1|2) priority="-n ${IONICE_PRIORITY:-7}" ;;
*) priority="" ;;
esac
ionice -c $IONICE_CLASS $priority -p $$ > /dev/null 2>&1 || true
;;
esac
fi
if getent passwd $LOCALUSER > /dev/null ; then
cd / && nice -n ${NICE:-10} updatedb.findutils 2>/dev/null
else
echo "User $LOCALUSER does not exist."
exit 1
fi
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