[arch-releng] HEADSUP: mkinitcpio and shutdown

[Gerardo Exequiel Pozzi]

On 12/15/2013 08:59 PM, Thomas Bächler wrote:
> The new mkinitcpio 16 (yes, we bumped from 0.15 to 16) in testing
> contains a new feature that automatically generates an "initramfs" on
> shutdown. systemd will pivot to this image on shutdown. All it does is
> re-run systemd-shutdown in a ramdisk, thus allowing a proper umount of /
> and proper shutdown of ALL loop and device mapper devices.
> 
> This feature is enabled automatically if
> * /run/initramfs exists (will be created on your next boot by tmpfiles),
> * /run/initramfs/shutdown doesn't exist or is not an executable,
> * The user hasn't masked mkinitcpio-generate-shutdown-ramfs.service.
> 
> This method should also be able to completely obsolete the custom
> shutdown hook in archiso and the mkinitcpio shutdown hook (using any of
> those will disable the new stuff).
> 

Nice, thanks for the work on making systemd working on
initramfs/de-initramfs.

But by nature of the archiso mount structure (/ mounted from
/run/archiso/...) of course this does not work, since systemd does not
know about this (in other words it needs to mount move /run/archiso
outside / before anything)

Remember that this is the first step, that I do on custom
archiso_shutdown script:

# /oldroot depends on things inside /oldroot/run/archiso...
mkdir /oldrun
mount -n --move /oldroot/run /oldrun


Just to test...

Successfully changed into root pivot.
Returning to initrd...
Sending SIGTERM to remaining processes...
Sending SIGKILL to remaining processes...
Unmounting file systems.
Unmounting /oldroot/sys/fs/cgroup/blkio.
Unmounting /oldroot/sys/fs/cgroup/net_cls.
Unmounting /oldroot/sys/fs/cgroup/freezer.
Unmounting /oldroot/sys/fs/cgroup/devices.
Unmounting /oldroot/sys/fs/cgroup/memory.
Unmounting /oldroot/sys/fs/cgroup/cpu,cpuacct.
Unmounting /oldroot/sys/fs/cgroup/cpuset.
Unmounting /oldroot/sys/fs/pstore.
[  114.204122] cgroup: option or name mismatch, new: 0x0 "", old: 0x4
"systemd"
Unmounting /oldroot/sys/fs/cgroup/systemd.
Unmounting /oldroot/sys/fs/cgroup.
Unmounting /oldroot/dev/pts.
Unmounting /oldroot/dev/shm.
Unmounting /oldroot/sys/kernel/security.
Unmounting /oldroot.
Unmounting /oldroot/run/archiso/sfs/root-image.
Unmounting /oldroot/run/archiso/cowspace.
Unmounting /oldroot/run/archiso/bootmnt.
Unmounting /oldroot/run.
Unmounting /oldroot/dev.
Unmounting /oldroot/sys.
Unmounting /oldroot/proc.
Unmounting /oldroot.
Unmounting /oldroot/run/archiso/sfs/root-image.
Unmounting /oldroot/run/archiso/cowspace.
Unmounting /oldroot/run/archiso/bootmnt.
Unmounting /oldroot/run.
Unmounting /oldroot.
Could not unmount /oldroot: Device or resource busy
Unmounting /oldroot/run/archiso/sfs/root-image.
Could not unmount /oldroot/run/archiso/sfs/root-image: Device or
resource busy
Unmounting /oldroot/run/archiso/cowspace.
Could not unmount /oldroot/run/archiso/cowspace: Device or resource busy
Unmounting /oldroot/run/archiso/bootmnt.
Could not unmount /oldroot/run/archiso/bootmnt: Device or resource busy
Unmounting /oldroot/run.
Could not unmount /oldroot/run: Device or resource busy
Not all file systems unmounted, 5 left.
Deactivating swaps.
All swaps deactivated.
Detaching loop devices.
Detaching loopback /dev/loop2.
Detaching loopback /dev/loop1.
Detaching loopback /dev/loop0.
All loop devices detached.
Detaching DM devices.
Detaching DM 254:0.
Could not detach DM /dev/dm-0: Device or resource busy
Not all DM devices detached, 1 left.
Unmounting file systems.
Unmounting /oldroot.
Unmounting /oldroot/run/archiso/sfs/root-image.
Unmounting /oldroot/run/archiso/cowspace.
Unmounting /oldroot/run/archiso/bootmnt.
Unmounting /oldroot/run.
Unmounting /oldroot.
Could not unmount /oldroot: Device or resource busy
Unmounting /oldroot/run/archiso/sfs/root-image.
Could not unmount /oldroot/run/archiso/sfs/root-image: Device or
resource busy
Unmounting /oldroot/run/archiso/cowspace.
Could not unmount /oldroot/run/archiso/cowspace: Device or resource busy
Unmounting /oldroot/run/archiso/bootmnt.
Could not unmount /oldroot/run/archiso/bootmnt: Device or resource busy
Unmounting /oldroot/run.
Could not unmount /oldroot/run: Device or resource busy
Not all file systems unmounted, 5 left.
Detaching DM devices.
Detaching DM 254:0.
Could not detach DM /dev/dm-0: Device or resource busy
Not all DM devices detached, 1 left.
Cannot finalize remaining file systems and devices, giving up.
Storage is finalized.
[  114.300170] reboot: Power down


-- 
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1

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