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Re: upstart plans for F10+


2008/5/22 Bill Nottingham <notting redhat com>:
> Since I've been asked in various places what we're planning to
> do with upstart now that Fedora 9 has shipped, I figured I'd
> lay out the basic plan.
> To do any large-scale conversion of SysV init scripts to upstart,
> we need some features that are not in the current (0.3.9) version.
> Hence, the first thing is to get upstart 0.5 ready for inclusion.
> For example, we need support for the following:
> - Depending on multiple events

AFAIK it's already in Upstart trunk

>  I.e., have something start only if two separate events have
>  both completed successfully. For a disturbing example of how
>  we work around this now, read /etc/event.d/serial.

FYI /etc/event.d was changed to /etc/init/jobs.d

> - Ability to enable/disable events in a way other than removing
>  the file
>  (The reasoning for this should be fairly obvious)
> - Ability to group events into sets, or profiles
>  This allows us to handle the sort of behaviors that runlevels are
>  used for sanely.
> - Ability to easily have upstart events depend on SysV scripts, and
>  vice-versa
>  If one of a SysV scripts' dependencies is started by upstart, we
>  need to be able to still handle that sanely.
> This isn't meant to be an exhaustive list, but it is meant to
> illustrate why we can't just move services right now.
> Once we get upstart 0.5 in, we can then look at potentially moving
> some subset of things that are now handled elsewhere to upstart.
> Examples would be:
> - Always-on services such as dbus, syslog, and audit
> - Reworking things like netfs to be more sane, when
>  it comes to networks coming and going, network block devices being
>  attached and detached, and so on
> - Potentially splitting some of rc.sysinit into multiple events.
>  Not sure this buys us much, as right now the flow is *extremely*
>  sequential (start_udev -> fsck -> remount r/w -> clean out /tmp)

I wanted to do this, but actually initctl is not finished - it will be
needed to sending variable values i.e. value of SELINUX_STATE from
rcS-check-selinux-state to scripts that depend on SELINUX_STATE.

> - Coming up with a sane network notification strategy
>  Right now, we have events kicked off on network changes:
>  - via netreport
>  - via NetworkManagerDispatcher
>  - conceivably, via upstart (after all, spawning commands/etc based
>    on events is its raison d'etre)
>  Having a coherent strategy for apps to only need to worry about
>  dropping things in one place would make sense.
> - (possibly) having either upstart 'handle' sysv services more natively
>  or wrap tools such as chkconfig, /sbin/service so they handle both
>  SysV and upstart.
> All clear as mud?
> Bill
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