All stages must be able to handle an input_dir argument, as we now
either pass it to all or none for agiven run. Simply set it to
'None' if it is not provided.
Signed-off-by: Tom Gundersen <teg@jklm.no>
Stages should be as stateless as possible. Don't provide an easy way out
of that.
Only the dnf stage used stage to save the dnf cache. That's only useful
during development and can be solved by pointing to a local repo mirror.
Introduce `run-stage` script, which sets up the build environment before
running the stage. Run `ldconfig`, `systemd-sysusers`, and
`systemd-tmpfiles` in it.
Use systemd-nspawn's "volatile" mode, which creates a tmpfs for the root
directory. This ensures that we're not accidentally using configuration
from the host.
The only remaining hole is `/etc/pki`.
Anaconda cannot run without its configuation in `/etc`. Recreate the
defaults.
Rather than treating the dnf-cache specially, give each stage its
own state directory that they can reuse. This should obviously be
used with care by the stages in order to make the builds
reproducible.
Some stages will be chrooting into the target to run things there,
and they will require the standard API VFS to be mounted. Some
tools do that themselves, other do not. In all cases, we would like
to discourage running things in the target tree.
For these reasons do not pre-mount the API VFS, but require the
stages who need it to do the mounting themselves. This is a partial
revert of f6023ed78b.
