If a kiwi initrd is used, the kernel used to build the kiwi
initrd and the kernel used in the system image must be the
same in order to avoid an inconsistent boot setup. This is
related to (bsc#1027610)
If an initrd_system different from kiwi is selected for a
vmx (simple disk) image, it does not make sense to setup a reference
to a kiwi boot image description, because no kiwi boot image will be
built. Despite that it does not hurt it's still an inconsistent
setup. This is related to (bsc#1027610)
Runtime check to check for required docker tools umoci and
skopeo. As long as tools tools are not available in the
core distro of all distributions we avoid spec file requirements
and check at runtime if they can be found
The root volume in a systemdisk setup is handled in a special
way. It is not allowed to setup a custom name or mountpoint for
the root volume. Therefore the size of the root volume can be
setup via the @root volume name. This check looks up the volume
setup and searches if there is a configuration for the '/'
mountpoint which would cause the image build to fail
An instance of RuntimeChecker allows to semantically check for
error conditions according to the provided image description
and build options. Related to #20
