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Add a finalrd script to move filesystems #124

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Closed

Add a finalrd script to move filesystems #124

wants to merge 1 commit into from

Commits on Dec 1, 2021

  1. Add a finalrd script to move filesystems 

    `/mnt/run/base` contains the snap file that is mounted on `/`. For
that reason it is not possible to unmount `/mnt/run/base` until we
have switched root to the shutdown ramfs.

At this point before we move `/sysroot/mnt/run/base` out of `/sysroot`
so that `systemd-shutdown` is able to unmount all filesystems.

`systemd-shutdown` allows hooks. But they are called right after
`systemd-shutdown`. That means we cannot run a hook after the root
switch and before `systemd-shutdown`. For that reason the
finalrd hook replaces `systemd-shutdown` in the ramfs by a wrapper.

This solution is not elegant. In the long term we should try to make
`systemd-shutdown` always move all sub mount points before trying to
unmount.

Also, there is still an error message when systemd tries to umount
`/mnt/run/base` before switching root. There does not seem to be
anyway to make `mnt-run-base.mount` perpetual.
    @valentindavid
    valentindavid committed Dec 1, 2021
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