Having multiple matchers is a bit tricky if we don't know how they
should be combined. For example if we have a match on a label and a
device name and both produce valid matches, which one should we choose?

So let's restrict the use of device matchers to allow only one method
right now. If we later figure out a better way how to combine these
matchers, we can still lift this restriction easily.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

We want to make sure that the options defined in disk.${name}.match are
working. So we define a bunch of disks with all currently available
matching methods and check afterwards if the devices get mounted.

Of course the "check afterwards" part is solely theoretical because this
is not yet supported in nixpart.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

Just remove the redundant "array", because RAID already includes array
in the A.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

We want to know the messages printed to stdout regardless of whether
nixpart -m has failed or not, primarily because it makes debugging
easier (just adding "print(something)" should suffice).

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

So far we checked whether /mnt is a valid mountpoint during invocation
of remountAndCheck. Now since we have the "matchers" sub test, we no
longer have anything mounted directly in /mnt, so it doesn't make sense
to check it unconditionally.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

We're basically destroying the initial information that's relevant for
the matchers to actually match the corresponding devices, so we need
those labels to find the newly created dummy ext4 file systems again.

This also makes the definitions for fileSystems less redundant, because
we now generate it using listToAttrs and genList.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

Adds support for mounting of file systems, which means that now the
"btrfs", "ext" and "matchers" storage tests are succeeding.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>