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 packages subsection <ignore> only accepted a package
name to become ignored. However a <package> subsection
to install a package allows for an arch selection. The
same should apply to ignore a package. In addition the
allowed content for the arch attribute has been changed
from simple text to a regular expression. Allowed is a
comma seperated list of reserved architecture words like
they are displayed by uname -m
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
Some attributes needed to be changed in the test xmls. With this
commit all the description files are consistent with the new co-
occurrence constraints.
Now each user item may or may not have a groups attribute. The
groups attribute is a comma separated list of group names. If
present the first group name will be the login or primary group,
if not present, the underlying toolchain will assign the default
login group for that user.
An instance of RuntimeChecker allows to semantically check for
error conditions according to the provided image description
and build options. Related to #20
