openSUSE / agama / 7712586799

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Expose partitions on D-Bus (#1016)

## Problem

The Agama storage service currently exports a tree of devices on D-Bus.
Such a tree only contains objects for the candidate devices for the
installation. But the information about their partitions is missing.
Partitions are need for serveral reasons, for example, to indicate how
to find space in the selected devices.

## Solution

Make the tree of devices to include objects for the partitions. The
partition object implements the *org.opensuse.Agama.Storage1.Block*
interface.

~~~
# busctl --address unix:path=/run/agama/bus tree
org.opensuse.Agama.Storage1
└─/org
  └─/org/opensuse
    └─/org/opensuse/Agama
      └─/org/opensuse/Agama/Storage1
        ├─/org/opensuse/Agama/Storage1/Proposal
        └─/org/opensuse/Agama/Storage1/system
          ├─/org/opensuse/Agama/Storage1/system/68
          ├─/org/opensuse/Agama/Storage1/system/69
          ├─/org/opensuse/Agama/Storage1/system/70
          ├─/org/opensuse/Agama/Storage1/system/71
          ├─/org/opensuse/Agama/Storage1/system/77
          ├─/org/opensuse/Agama/Storage1/system/79
          ├─/org/opensuse/Agama/Storage1/system/80
          ├─/org/opensuse/Agama/Storage1/system/82
          ├─/org/opensuse/Agama/Storage1/system/83
          └─/org/opensuse/Agama/Storage1/system/85

# busctl --address unix:path=/run/agama/bus introspect
org.opensuse.Agama.Storage1 /org/opensuse/Agama/Storage1/system/68
org.opensuse.Agama.Storage1.PartitionTable
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
.Partitions property ao 1 "/org/opensuse/Agama/Storage1/system/…
emits-change
.Type property s "gpt" emits-change

# busctl --address unix:path=/run/agama/bus get-property
org.opensuse.Agama.Storage1 /org/opensuse/Agama/Storage1/system/68
org.opensuse.Agama.Storage1.PartitionTable Partitions
ao 1 "/org/opensuse/Agama/Storage1/system/77"

# busctl --address unix:path=/run/agama/bus introspect
org.opensuse.Agama.Storage1 /org/op... (continued)

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