Re: strawman proposal: homed directories for users

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On Tue, Oct 08, 2024 at 06:14:29PM +0100, Barry Scott wrote:
> > On 4 Oct 2024, at 16:05, Zbigniew Jędrzejewski-Szmek <zbyszek@xxxxxxxxx> wrote:
> > 
> > Hi folks,
> > 
> > I was recently doing a bunch of test reinstalls of Fedora [1],
> > looking to see if it's complicated to retain the user directories
> > during a reinstall. The answer is, sadly, that it's possible only with
> > some manual tinkering. This is a known problem [2].
> > 
> > With a little bit of trickery, Anaconda will let the "home" subvolume
> > be and install the system to a new "root" subvolume, so user data is
> > preserved. But then after a reboot a new user will be created, because
> > the old user is not hooked up into /etc/passwd.
> > 
> > We actually have a partial solution for this: systemd-homed.
> > With systemd-homed the information about the user is maintained in the
> > user directory/subvolume/partition, e.g. /home/username.homedir.
> > After a reinstall, ideally nothing needs to be done and the user
> > account is ready to be used.
> 
> I like the idea of being able to reinstall and keep the /home.
> But I'd rather not use systemd-homed to get the feature.
> I already have full-disk-encryption for security.
> 
> What about having the necessary meta data in a per user file in /home
> and read that when doing the reinstall?
> 
> I would have /home/barry and /home/barry.metadata for example.

What you describe is pretty much the proposal you were replying to,
just with different paths. You'd have (unencrypted)
/home/barry.homedir/ and /home/barry.homedir/.identity and
systemd-homed would create /home/barry/ with a bind mount.

You mention FDE, but the proposal was explicitly about homed homes
without encryption at the homed level. This kind of setup is often
used with FDE.

Zbyszek
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