[Bug 687535] [NEW] upstart loses track of ssh daemon after reload ssh

[AlainKnaff]

Public bug reported:

When sshd gets a signal 1 for reload, it forks a new process and ditches
the old. This causes upstart to believe that ssh has crashed, and loses
track of it. A second reload (or any other initctl operation on ssh)
will thus say:

reload: Unknown instance:

There would be 2 ways to fix this:
1.  Don't have ssh fork on relod, but keep the same pid
2. Use a different mechanism in upstart to keep track of ssh. Maybe a pid file? Just tracking children of the exited ssh won't work, or it might accidentally track a particular session rather than the master, if somebody just happens to log in close to reload time.


# lsb_release -rd
Description:    Ubuntu 10.04.1 LTS
Release:        10.04

# dpkg -l openssh-server | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                        Version                                                    Description
+++-===========================================-==========================================================-=================================================================
ii  openssh-server                              1:5.3p1-3ubuntu4                                           secure shell (SSH) server, for secure access from remote machines

# dpkg -l upstart
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  upstart        0.6.5-7        event-based init daemon

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/687535

Title:
  upstart loses track of ssh daemon after reload ssh