/etc/init.d/mtab.sh is in initscripts 2.88dsf-41+deb7u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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### BEGIN INIT INFO
# Provides: mtab
# Required-Start: checkroot
# Required-Stop:
# Default-Start: S
# Default-Stop:
# Short-Description: Update mtab file.
# Description: Update the mount program's mtab file after
# all local filesystems have been mounted.
### END INIT INFO
#
# The main purpose of this script is to update the mtab file to reflect
# the fact that virtual filesystems were mounted early on, before mtab
# was writable.
#
PATH=/sbin:/bin
. /lib/init/vars.sh
. /lib/init/tmpfs.sh
TTYGRP=5
TTYMODE=620
[ -f /etc/default/devpts ] && . /etc/default/devpts
KERNEL="$(uname -s)"
. /lib/lsb/init-functions
. /lib/init/mount-functions.sh
do_start () {
# Note that mtab should have been previously initialised by
# checkroot.sh.
# Add entries for mounts created in early boot
# S01mountkernfs.sh
/etc/init.d/mountkernfs.sh mtab
/etc/init.d/mountkernfs.sh reload
# S03udev
domount mtab tmpfs "" /dev "udev" "-omode=0755"
# S03mountdevsubfs.sh
/etc/init.d/mountdevsubfs.sh mtab
/etc/init.d/mountdevsubfs.sh reload
# Add everything else in /proc/mounts into /etc/mtab, with
# special exceptions.
while read FDEV FDIR FTYPE FOPTS REST
do
case "$FDIR" in
/lib/modules/*/volatile)
FDEV="lrm"
;;
/dev/.static/dev)
# Not really useful to show in 'df',
# and it isn't accessible for non-root
# users.
continue
;;
esac
domount mtab "$FTYPE" "" "$FDIR" "$FDEV" "-o$FOPTS"
done < /proc/mounts
}
case "$1" in
start|"")
do_start
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
stop)
# No-op
;;
*)
echo "Usage: mountall-mtab.sh [start|stop]" >&2
exit 3
;;
esac
:
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