Compare Upstart's ssh handling to the SysV init script

etc-init-ssh.conf

# ssh - OpenBSD Secure Shell server
#
# The OpenSSH server provides secure shell access to the system.

description     "OpenSSH server"

start on filesystem
stop on runlevel [!2345]

respawn
respawn limit 10 5
umask 022
# replaces SSHD_OOM_ADJUST in /etc/default/ssh
oom never

pre-start script
    test -x /usr/sbin/sshd || { stop; exit 0; }
    test -e /etc/ssh/sshd_not_to_be_run && { stop; exit 0; }
    test -c /dev/null || { stop; exit 0; }
    
    mkdir -p -m0755 /var/run/sshd
end script
        
# if you used to set SSHD_OPTS in /etc/default/ssh, you can change the
# 'exec' line here instead
exec /usr/sbin/sshd -D

etc-init.d-ssh.sh

#! /bin/sh

### BEGIN INIT INFO
# Provides:		sshd
# Required-Start:	$remote_fs $syslog
# Required-Stop:	$remote_fs $syslog
# Default-Start:	2 3 4 5
# Default-Stop:		
# Short-Description:	OpenBSD Secure Shell server
### END INIT INFO

set -e

# /etc/init.d/ssh: start and stop the OpenBSD "secure shell(tm)" daemon

test -x /usr/sbin/sshd || exit 0
( /usr/sbin/sshd -\? 2>&1 | grep -q OpenSSH ) 2>/dev/null || exit 0

chrooted() {
    # borrowed from udev's postinst
    # and then borrowed from initramfs-tools's preinst
    if [ "$(stat -c %d/%i /)" = "$(stat -Lc %d/%i /proc/1/root 2>/dev/null)" ]; then
	# the devicenumber/inode pair of / is the same as that of
	# /sbin/init's root, so we're *not* in a chroot and hence
	# return false.
	return 1
    fi
    return 0
}

# The init.d script is only for chroots
if [ -e /etc/init/ssh.conf ] && ! chrooted; then
    exec /lib/init/upstart-job ssh "$@"
fi

umask 022

export SSHD_OOM_ADJUST=-17
if test -f /etc/default/ssh; then
    . /etc/default/ssh
fi

# Are we in a virtual environment that doesn't support modifying
# /proc/self/oom_adj?
if grep -q 'envID:.*[1-9]' /proc/self/status; then
    unset SSHD_OOM_ADJUST
fi

. /lib/lsb/init-functions

if [ -n "$2" ]; then
    SSHD_OPTS="$SSHD_OPTS $2"
fi

# Are we running from init?
run_by_init() {
    ([ "$previous" ] && [ "$runlevel" ]) || [ "$runlevel" = S ]
}

check_for_no_start() {
    # forget it if we're trying to start, and /etc/ssh/sshd_not_to_be_run exists
    if [ -e /etc/ssh/sshd_not_to_be_run ]; then 
	if [ "$1" = log_end_msg ]; then
	    log_end_msg 0
	fi
	if ! run_by_init; then
	    log_action_msg "OpenBSD Secure Shell server not in use (/etc/ssh/sshd_not_to_be_run)"
	fi
	exit 0
    fi
}

check_dev_null() {
    if [ ! -c /dev/null ]; then
	if [ "$1" = log_end_msg ]; then
	    log_end_msg 1 || true
	fi
	if ! run_by_init; then
	    log_action_msg "/dev/null is not a character device!"
	fi
	exit 1
    fi
}

check_privsep_dir() {
    # Create the PrivSep empty dir if necessary
    if [ ! -d /var/run/sshd ]; then
	mkdir /var/run/sshd
	chmod 0755 /var/run/sshd
    fi
}

check_config() {
    if [ ! -e /etc/ssh/sshd_not_to_be_run ]; then
	/usr/sbin/sshd $SSHD_OPTS -t || exit 1
    fi
}

export PATH="${PATH:+$PATH:}/usr/sbin:/sbin"

case "$1" in
  start)
	check_privsep_dir
	check_for_no_start
	check_dev_null
	log_daemon_msg "Starting OpenBSD Secure Shell server" "sshd"
	if start-stop-daemon --start --quiet --oknodo --pidfile /var/run/sshd.pid --exec /usr/sbin/sshd -- $SSHD_OPTS; then
	    log_end_msg 0
	else
	    log_end_msg 1
	fi
	;;
  stop)
	log_daemon_msg "Stopping OpenBSD Secure Shell server" "sshd"
	if start-stop-daemon --stop --quiet --oknodo --pidfile /var/run/sshd.pid; then
	    log_end_msg 0
	else
	    log_end_msg 1
	fi
	;;

  reload|force-reload)
	check_for_no_start
	check_config
	log_daemon_msg "Reloading OpenBSD Secure Shell server's configuration" "sshd"
	if start-stop-daemon --stop --signal 1 --quiet --oknodo --pidfile /var/run/sshd.pid --exec /usr/sbin/sshd; then
	    log_end_msg 0
	else
	    log_end_msg 1
	fi
	;;

  restart)
	check_privsep_dir
	check_config
	log_daemon_msg "Restarting OpenBSD Secure Shell server" "sshd"
	start-stop-daemon --stop --quiet --oknodo --retry 30 --pidfile /var/run/sshd.pid
	check_for_no_start log_end_msg
	check_dev_null log_end_msg
	if start-stop-daemon --start --quiet --oknodo --pidfile /var/run/sshd.pid --exec /usr/sbin/sshd -- $SSHD_OPTS; then
	    log_end_msg 0
	else
	    log_end_msg 1
	fi
	;;

  try-restart)
	check_privsep_dir
	check_config
	log_daemon_msg "Restarting OpenBSD Secure Shell server" "sshd"
	set +e
	start-stop-daemon --stop --quiet --retry 30 --pidfile /var/run/sshd.pid
	RET="$?"
	set -e
	case $RET in
	    0)
		# old daemon stopped
		check_for_no_start log_end_msg
		check_dev_null log_end_msg
		if start-stop-daemon --start --quiet --oknodo --pidfile /var/run/sshd.pid --exec /usr/sbin/sshd -- $SSHD_OPTS; then
		    log_end_msg 0
		else
		    log_end_msg 1
		fi
		;;
	    1)
		# daemon not running
		log_progress_msg "(not running)"
		log_end_msg 0
		;;
	    *)
		# failed to stop
		log_progress_msg "(failed to stop)"
		log_end_msg 1
		;;
	esac
	;;

  status)
	status_of_proc -p /var/run/sshd.pid /usr/sbin/sshd sshd && exit 0 || exit $?
	;;

  *)
	log_action_msg "Usage: /etc/init.d/ssh {start|stop|reload|force-reload|restart|try-restart|status}"
	exit 1
esac

exit 0