Bug#804018: options to avoid service startup on package installation

[Ian Jackson <ijackson@chiark.greenend.org.uk>]

This bug came up in the DC18 rolling policy sprint (ie, I overheard
Sean mentioning it).

ISTM that in days gone by this would have been (should have been) a
wishlist item for invoke-rc.d.  The interface was defined in
invoke-rc.d(8) and README.policy-rc.d.gz.  I am happy to fold
policyrcd-script-zg2 into init-system-helpers, if some would care to
submit a patch to do that.  Please do that as a separate bug.
Alternatively we could just let policyrcd-script-zg2 continue to
exist.

Nowadays, there is systemd too.  I have no idea whether
policyrcd-script-zg2 works with systemd.  If it doesn't then I guess a
more general interface ought to be defined.  That might plausibly be a
policy bug although it would probably be more sensible for people who
want this feature across different init systems to try to design that.

If systemd has a different way of achieving the same overall objective
then maybe the answer is just that the admin must configure this
differently depending on what init system they have.

I hope this analysis is helpful.

Thanks,
Ian.

-- 
Ian Jackson <ijackson@chiark.greenend.org.uk>   These opinions are my own.

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