Am 30.12.2016 um 22:16 schrieb Felipe Sateler: > Well, rebooting from sysvinit to systemd is supposed to work too, so > it doesn't explain everything. But, your experience appears to uncover > another bug: for some reason the sysvinit mount scripts will unmount > /usr! This is a bad idea, as the distinction between / and /usr is not > relevant anymore (because we now have initramfs), and will stop > existing after the /usr merge. The question is, why would sysvinit > unmount /usr, it probably shouldn't.
So, I've setup a split-usr VM and I can reproduce the issue.
If you switch from sysvinit-core to systemd-sysv in one step (i.e.
without the intermediary boot via init=/bin/systemd), the
shutdown/reboot step fails when trying to call the reboot binary (i.e.
systemctl)
/etc/rc6.d/ looks like:
...
> lrwxrwxrwx 1 root root 18 Dez 20 12:46 K07umountfs -> ../init.d/umountfs
> lrwxrwxrwx 1 root root 20 Dez 20 12:46 K08umountroot ->
> ../init.d/umountroot
> lrwxrwxrwx 1 root root 16 Dez 20 12:46 K09reboot -> ../init.d/reboot
Afaics, /usr is unmounted by umountfs.
Some possible ideas
1/ document that switching from sysvinit-core to systemd-sysv is best
done by first installing systemd, then booting via init=/bin/systemd on
the kernel-command-line, then making the switch permanent by
uninstalling sysvinit-core and installing systemd-sysv
And if you are using a split-usr setup, doing it this way is mandatory
2/ update umountfs to not umount /usr. But then, something needs to
umount /usr later or at least remount it ro. I don't think we can just
leave /usr mounted without risking an unclean fs. Under systemd, the
umount of /usr is done by /lib/systemd/systemd-shutdown.
3/ when switching from sysvinit-core to systemd-sysv, keep a copy of the
(old) /sbin/{reboot,halt,poweroff} in /run and use that in
/etc/init.d/reboot
4/ move liblz4 to /lib.
I don't like 4/ very much, as eventually we have to fix this anyway
(thinking of usrmerge).
Thoughts, other ideas?
Fwiw, I'm personally leaning towards 1/.
Michael
--
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?
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