[Bug 1320415] Re: postfix started in single user mode during upgrade

[Phillip Susi]

I'm a little confused.  I thought that runlevel S was a pseudo runlevel
that only ever contained S links that were only called during initial
boot, no matter what runlevel you were going to, and that a shutdown or
booting with the 's' argument transitioned you to runlevel 1.  As such,
update-rc.d isn't supposed to create a K link in /etc/rcS.d, since the
rc scripts would never use it.

invoke-rc.d has this comment:

### LOCAL INITSCRIPT POLICY: Enforce need of a start entry
### in either runlevel S or current runlevel to allow start
### or restart.

That seems pretty clear: there is no S link for postfix in either rcS.d
nor rc1.d, so it shouldn't be starting it.

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https://bugs.launchpad.net/bugs/1320415

Title:
  postfix started in single user mode during upgrade

Status in “sysvinit” package in Ubuntu:
  Confirmed

Bug description:
  I shutdown my server to single user mode and ran a dist-upgrade.  The
  postfix postint started the daemon, even though it is not supposed to
  be running in single user mode.

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