This is a tricky one because all of the dependencies make sense in
isolation. Even if we remove the dependency added by that upstream
OpenZFS commit, given that modern systems use zfs-mount-generator,
systemd-random-seed.service is going to Require= and After= var-
lib.mount because of its RequiresMountsFor=/var/lib/systemd/random-seed.
The generated var-lib.mount will be After=zfs-import.target because you
can't mount a filesystem without importing the pool. And zfs-
import.target is After= the two zfs-import-* services. Those are after
cryptsetup.target, as you might be running your pool on top of LUKS.
Mostly side note: it does seem weird and unnecessary that zfs-load-
module.service has After=cryptsetup.target. We should probably remove
that. That is coming from debian/patches/2100-zfs-load-module.patch
(which is what provides zfs-load-module.service in its entirety).
One idea here would be to eliminate the After=cryptsetup.target from
zfs-import-{cache,scan}.service and require that someone add them via a
drop-in if they are running on LUKS. However, in that case, they'll run
into the same problem anyway. So that's not really a fix.
Another option might be to remove the zfs-mount.service Before=systemd-
random-seed.service and effectively require the use of the mount
generator for Root-on-ZFS setups. That is what the Ubuntu installer does
and what the Root-on-ZFS HOWTO will use for 20.04 anyway. (I'm working
on it actively right now.) Then, modify zfs-mount-generator to NOT After
=zfs-import.target (and likewise for Wants=) if the relevant pool is
already imported (and likewise for the zfs-load-key- services). Since
the rpool will already be imported by the time zfs-mount-generator runs,
that would be omitted.
I've attached an *untested* patch to that effect. I hope to test this
yet tonight as I test more Root-on-ZFS scenarios, but no promises.
** Patch added: "2150-fix-systemd-dependency-loops.patch"
https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1875577/+attachment/5366544/+files/2150-fix-systemd-dependency-loops.patch
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https://bugs.launchpad.net/bugs/1875577
Title:
Encrypted swap won't load on 20.04 with zfs root
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