On Fri, Apr 17, 2020 at 04:48:11PM +0300, Panu Matilainen wrote: > On 3/26/20 1:32 PM, Zbigniew Jędrzejewski-Szmek wrote: > >On Thu, Mar 26, 2020 at 01:16:22PM +0200, Panu Matilainen wrote: > > > >Right. I realize %posttrans is not a good idea. But *some* mechanism > >is necessary, because without that the change will mostly be a noop > >for most users. So I think this needs to be decided somehow. > > > [...] > >- a one-shot service: this is easier to implement, it just needs to > > happen in one place. The hard part is making sure that the machine > > does not get reboot while the upgrade is happening. This is in > > particular a problem with VMs and containers. The rebuild should be > > wrapped with systemd-inhibit and other guards to make it hard to > > interrupt. > > Looking at the details of how to do this now. > > The idea is to install a generic "rebuild rpmdb on boot" one-shot > service, which can be flagged for action by 'touch > /var/lib/rpm/.rebuilddb'. That would be done from rpm %posttrans > when the rpmdb default changes, basically: > > '[ -f /var/lib/rpm/Packages ] && touch /var/lib/rpm/.rebuilddb' > > Should it become necessary, the same mechanism can be used to > convert back. This will of course trigger some "extra" rebuilds for > anybody staying on BDB backend but I'd say that's a feature... Shouldn't this be a one-time thing instead? E.g. '%triggerpostun rpm < n.n.n-n', where n.n.n-n is the first version with the changed default? > I'm thinking of something like this for > /usr/lib/systemd/rpmdb-rebuild.service: > > --- > [Unit] > Description=RPM database rebuild > ConditionPathExists=/var/lib/rpm/.rebuilddb > > [Service] > Type=oneshot > ExecStart=/usr/bin/rpmdb --rebuilddb > ExecStartPost=rm -f /var/lib/rpm/.rebuilddb > > [Install] > WantedBy=basic.target [Unit] Description=RPM database rebuild ConditionPathExists=/var/lib/rpm/.rebuilddb DefaultDependencies=no After=sysinit.target Before=basic.target shutdown.target Conflicts=shutdown.target [Service] Type=oneshot ExecStart=rpmdb --rebuilddb ExecStartPost=rm -f /var/lib/rpm/.rebuilddb [Install] WantedBy=basic.target (Service units have default dependency on basic.target, so if this is to be ordered before basic.target, it needs DefaultDependencies=no.) > This should be run quite early in the boot, before other daemons > that potentially access the rpmdb get started (abrt, dnfdaemon), > basically just as soon as /etc, /usr and /var are mounted. Is there > something else I should add, or something better to hook onto? Other > finer details that I'm missing? > > It'll need a preset to enable by default if this ends up being the > route taken, but lets hear the feedback first before I go file the > bug... Zbyszek _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
