On Friday 15 August 2014 at 12:19:50, Lennart Poettering wrote: > [...] > > > > > > > > I'd like to make this work both with initramfs and without one > > > > (provided that > > > > the rootfs has been mounted read-only by using 'ro' kernel cmdline > > > > parameter). > > > > > > > > In this case, what are the needed orderings? > > > > > > Actually systemd-remount-fs.service uses After=local-fs-pre.target > > > anyway, so ordering before l-f-p.t should be nough. > > > > Hm. In git (v215-651-g41488fe), it is > > > > Before=local-fs-pre.target local-fs.target shutdown.target > > Wants=local-fs-pre.target > > Ah, right. This is actually correct here. We want to make sure that the > root fs is remounted before we mount the other units, since this might > required creating additional directories to mount things on... > > There are two more complications: > > a) if you want to make use of local-fs-pre.target you actually have to > pull it in, it's a "passive" unit. See systemd.special(5). > > b) You want to run your stuff before fsck is run on the devices, so that > you don't end up interrupting an fsck that is half in progress. > > To put this together, in your unit file you need: > > Before=local-fs-pre.target systemd-remount-fs.service > systemd-fsck-root.service > Wants=local-fs-pre.target > > That should be enough. (You don't need to individually order the > systemd-fsck@.service instances for the other devices after your > service, since they are already ordered after systemd-fsck-root.service, > and you order yourself before that, so all is good). > > Lennart
One more question. What about setups with no initrd and read-write rootfs?
In such cases, the resume unit must silently skip itself.
ConditionPathIsReadWrite=!/ doesn't seem to be useful here: with initramfs
this check will yield a false-negative.
This can be solved by introducing two resume units (say,
systemd-resume@.service and initrd-resume@.service), first with
Before=local-fs-pre.target systemd-remount-fs.service
systemd-fsck-root.service
Wants=local-fs-pre.target
ConditionPathIsReadWrite=!/
and the second one with
ConditionPathExists=/etc/initrd-release
# something else ?
BTW... are you sure that the second variant (in initramfs) does not require
something
to order before sysroot.mount and all fsck units?..
--
Ivan Shapovalov / intelfx /
signature.asc
Description: This is a digitally signed message part.
_______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
