/etc/init.d/umountnfs.sh is in initscripts 2.88dsf-59.3ubuntu2.
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: umountnfs
# Required-Start:
# Required-Stop: umountfs
# Should-Stop: $network $portmap nfs-common
# Default-Start:
# Default-Stop: 0 6
# Short-Description: Unmount all network filesystems except the root fs.
# Description: Also unmounts all virtual filesystems (proc,
# devpts, usbfs, sysfs) that are not mounted at the
# top level.
### END INIT INFO
PATH=/sbin:/usr/sbin:/bin:/usr/bin
KERNEL="$(uname -s)"
RELEASE="$(uname -r)"
. /lib/init/vars.sh
. /lib/lsb/init-functions
case "${KERNEL}:${RELEASE}" in
Linux:[01].*|Linux:2.[01].*)
FLAGS=""
;;
Linux:2.[23].*|Linux:2.4.?|Linux:2.4.?-*|Linux:2.4.10|Linux:2.4.10-*)
FLAGS="-f"
;;
*)
FLAGS="-f -l"
;;
esac
do_stop () {
# Write a reboot record to /var/log/wtmp before unmounting
halt -w
# Remove bootclean flag files (precaution against symlink attacks)
rm -f /tmp/.clean /run/.clean /run/lock/.clean
#
# Make list of points to unmount in reverse order of their creation
#
DIRS=""
while read -r DEV MTPT FSTYPE OPTS REST
do
case "$MTPT" in
/|/proc|/dev|/dev/pts|/dev/shm|/proc/*|/sys|/run|/run/*)
continue
;;
esac
case "$FSTYPE" in
nfs|nfs4|smbfs|ncp|ncpfs|cifs|coda|ocfs2|gfs|ceph)
DIRS="$MTPT $DIRS"
;;
proc|procfs|linprocfs|devpts|usbfs|usbdevfs|sysfs)
DIRS="$MTPT $DIRS"
;;
esac
case "$OPTS" in
_netdev|*,_netdev|_netdev,*|*,_netdev,*)
DIRS="$MTPT $DIRS"
;;
esac
done < /etc/mtab
if [ "$DIRS" ]
then
[ "$VERBOSE" = no ] || log_action_begin_msg "Unmounting remote and non-toplevel virtual filesystems"
fstab-decode umount $FLAGS $DIRS
ES=$?
[ "$VERBOSE" = no ] || log_action_end_msg $ES
fi
# emit unmounted-remote-filesystems hook point so any upstart jobs
# that support remote filesystems can be stopped
if [ -x /sbin/initctl ]; then
initctl --quiet emit unmounted-remote-filesystems 2>/dev/null || true
fi
}
case "$1" in
start|status)
# No-op
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
stop|"")
do_stop
;;
*)
echo "Usage: umountnfs.sh [start|stop]" >&2
exit 3
;;
esac
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