Bug#857452: Steps towards a patch to document disabling a daemon upon installation

[Felipe Sateler]

On Tue, Sep 12, 2017 at 9:49 AM, Ian Jackson
<ijackson at chiark.greenend.org.uk> wrote:
> 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.
>
> Yes.
>
>> 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
> do this:
>  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
>       runlevels
>  3. run
>       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).

I have a branch that does some refactoring to update-rc.d and adds the
new command[1]

Review welcome.

[1] https://anonscm.debian.org/cgit/collab-maint/init-system-helpers.git/log/?h=refactor


-- 

Saludos,
Felipe Sateler