Re: Steps towards a patch to document disabling a daemon upon installation
- Date: Tue, 12 Sep 2017 13:49:07 +0100
- From: Ian Jackson <ijackson@xxxxxxxxxxxxxxxxxxxxxx>
- Subject: Re: Steps towards a patch to document disabling a daemon upon installation
Felipe Sateler writes ("Re: Steps towards a patch to document disabling a daemon upon installation"):
> I suggest instead mentioning the real reasons its bad:
Thanks for providing real reasons.
> > I can't speak to the behaviour of systemd, but I think the
> > update-rc.d add-disabled
> > operation I propose would, for sysvinit systems, do the follow:
> > 1. Are there already rc*.d links for DAEMON ? If so, do nothing.
> > 2. If not, create them in the way that defaults && disable
> > would have done.
> Currently, update-rc.d leaves all the hard work to insserv under sysvinit.
> The behaviour would have to change to check if any links exist and skip
> invoking insserv in that case. I am not sure if that would mean a behavior
> change though. Maybe this early in the release cycle is a good time to
> try these kinds of changes.
I think that the right thing for `update-rc.d defaults-disabled' is to
1. check to see if any links already exist
if they do, do nothing else
2. parse the init script to find the default-start and default-stop
insserv add DAEMON,stop=RLVL,RLVL,....
(for the complete set of start and stop runlevels)
After this, the script is run for `stop' in each of those runlevels,
roughly like update-rc.d disable would do (the sequence numbers will
briefly not be identical, until insserv is re-run).
Better would be to add a feature to insserv to do (2) and (3) in one
go, but if we were to do that it should probably gain the
functionality in update-rc.d's sysv_toggle too.