/sysroot private mount and /home -> /sysroot/home

[cgwalters]

Related: #2085

Reported on IRC, today gnome-continuous uses /home ➡️ /sysroot/home but this conflicts with #1438 if the user creates mounts in their home directory.

I think basically everyone should use /var/home, but probably ostree should either disable the private mount for /sysroot if we detect these symlinks.

[valentindavid]

I have noticed that if I remove totally /home ➡️ var/home, then Flatpak applications with --filesystem=host do not have access to home directory, unless they also have --filesystem=home.

So it seems that home should be defined within /var/home in /etc/passwd, but the symlink should still exist for flatpak application to work correctly. (I still have to test that).

[jlebon]

So it seems that home should be defined within /var/home in /etc/passwd

Yes, note rpm-ostree for example does this: coreos/rpm-ostree#1726.

[valentindavid]

I can confirm that for Flatpak applications like org.flatpak.Builder need to have both the /home ➡️ var/home AND the home directory defined in /etc/passwd should be using /var/home. I have just tested it.

It is very peculiar that removing the symlink breaks flatpak.