[systemd-devel] [PATCH 6/7] mount: filesystems mounted in the initrd should not conflict with umount.target in the real root

[Colin Walters]

On Wed, 2013-09-11 at 16:55 +0200, Lennart Poettering wrote:

> Well, but /etc would be one of those which would be listed in that "OS
> resource dir list"... 

Sure, it makes total sense for systemd to hard require it (and the
others) to be mounted; again I'm just more interested in the unmounting.

> So there's three steps:
> 
> 1. normal unmounting using mount units

Trying to do this with current ostree is causing problems, and similarly
with special LiveCD setups, and as danpb said a while ago, container
cases where the external system mounts resources for the container.

> 2. killing spree unmounting of left-overs in a tight loop based on /proc/self/mountinfo

This part works fine for me.

> 3. initrd unmounting of remaining OS resource dirs

And I don't need this myself; having to keep the initramfs around just
to invoke umount() would be kind of lame when systemd can just do it
itself easily enough after all processes other than pid 1 are gone.

So step 3 is only needed AIUI for network/daemon-controlled root
filesystem (per
http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons/ )