[HEADS-UP] systemd for F14 - the next steps

[Simo Sorce]

On Thu, 22 Jul 2010 20:40:53 +0200
Lennart Poettering <mzerqung at 0pointer.de> wrote:

> On Thu, 22.07.10 08:05, Simo Sorce (ssorce at redhat.com) wrote:
> 
> > > to make real; give reality to (a hope, fear, plan, etc.).
> > >  
> > > but its seems quite an abstract term to associate reality with an
> > > abstract computer object.
> > 
> > Dave, I am not a native speaker, but I have the exact (or may be
> > even worse) problem. For as much as I try the syntax there is so
> > obscure I cannot "realize" what it means *at all*, just by looking
> > at it.
> > 
> > 
> > Lennart, "realize" really is a bad bad bad choice, please consider
> > changing it while there is still time.
> 
> Kay and I have discussed this now. We agreed to fold systemd-install
> into systemctl entirely, and replace --realize by --now. Also, we'll
> drop some of the options --realize had, and always imply that the init
> system configuration shall be reloaded after all changes took
> place. This basically means that this
> is what will be done in %post in the general case:
> 
> if [ $1 -eq 1 ] ; then
>      systemctl enable foo.service
> else
>      systemctl daemon-reload
> 
>      # Optionally, make the update daemon restart or reload its
> configuration systemctl reload-or-try-restart foo.service
> fi
> 
> And for %preun it'll be:
> 
> if [ $1 -eq 0 ] ; then
>     systemctl disable --now foo.service
> fi
> 
> Rationale:
> 
> "systemctl enable" installs the unit file in the system by creating
> the symlinks suggested in the unit file. It also implicitly reloads
> the configuration so that the init system knows about the changes.
> 
> "systemctl daemon-reload" simply tells the init system to reload its
> configuration, no new symlinks are created.
> 
> "systemctl reload-or-try-restart" tells the specified service to
> reload its configuration if it supports that. If it doesn't the
> daemon is restarted. This is identical to the LSB "force-reload"
> verb. However we chose to name this differently because we found
> "force-reload" not very descriptive. That said, the tool actually
> understands "force-reload" too, as equivalent (but it's not
> docuemnted). Something similar actually applies to condrestart. LSB
> calls Fedora's condrestart try-restart. We found the LSB name more
> descriptive and are advertising that, but we actually understand
> "condrestart" as an alias for it too. Anyway, all I wanna say here is
> that this nomenclature mostly stems from LSB though with some minimal
> changes, and we also understand the unmodified LSB and RH names for
> compat.
> 
> "systemctl disable --now" removes the unit file symlinks from
> /etc/systemd/system, terminates the unit before this and reloads the
> init system configuration after this. The "--now" controls whether the
> unit is stopped or not.
> 
> I hope this simplification sounds good to many of you.


Thanks, it looks *much* more understandable now!

Simo.



-- 
Simo Sorce * Red Hat, Inc * New York