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Re: [libvirt] [PATCH 8/8] Restart daemon at end of transaction



On Tue, Apr 03, 2012 at 10:06:05PM -0600, Eric Blake wrote:
> On 04/03/2012 06:48 AM, Daniel P. Berrange wrote:
> > From: "Daniel P. Berrange" <berrange redhat com>
> > 
> > It is not safe to restart libvirtd after install of the
> > libvirt-daemon RPM, since the corresponding driver modules
> > may not yet have been installed by RPM. The solution is to
> > move the restart logic to a %posttrans script. This runs
> > at completion of the RPM transaction, once everything is
> > uninstalled.
> > ---
> >  libvirt.spec.in |   13 +++++++++----
> >  1 files changed, 9 insertions(+), 4 deletions(-)
> 
> I haven't used %posttrans before, but it looks simple enough.  What I'm
> not sure of...
> 
> > 
> > diff --git a/libvirt.spec.in b/libvirt.spec.in
> > index d867b09..73e1ec3 100644
> > --- a/libvirt.spec.in
> > +++ b/libvirt.spec.in
> > @@ -1188,9 +1188,6 @@ fi
> >  %endif
> >  
> >  /sbin/chkconfig --add libvirtd
> > -if [ "$1" -ge "1" ]; then
> > -	/sbin/service libvirtd condrestart > /dev/null 2>&1
> > -fi
> >  %endif
> >  
> >  %preun daemon
> > @@ -1207,13 +1204,21 @@ if [ $1 = 0 ]; then
> >  fi
> >  %endif
> >  
> > -%postun daemon
> >  %if %{with_systemd}
> > +%postun daemon
> >  /bin/systemctl daemon-reload >/dev/null 2>&1 || :
> > +%endif
> 
> is why daemon-reload can be done right away,

This tells systemd to re-read the .unit and .service files, but not take
any action.


> > +%posttrans daemon
> > +%if %{with_systemd}
> >  if [ $1 -ge 1 ] ; then
> >      # Package upgrade, not uninstall
> >      /bin/systemctl try-restart libvirtd.service >/dev/null 2>&1 || :
> 
> but a full restart has to wait for %posttrans.  I was naively assuming
> they should both be %posttrans.

And this actually makes systemd take some actions.


I guess we could also postpone the daemon-reload to %posttrans without
any ill-effects though.

Daniel
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