PartitionEditor: Add the beginnings of a partition editor :^)

This adds a new application PartitionEditor which will eventually be
used to create and edit partition tables. Since LibPartition does not
know how to write partition tables yet, it is currently read-only.

Devices are discovered by scanning /dev for block device files.
Since block devices are chmod 600, PartitionEditor be must run as root.

By default Serenity uses the entire disk for the ext2 filesystem
without a partition table. This isn't useful for testing as the
partition list for the default disk will be empty. To test properly,
I created a few disk images using various partitioning schemes
(MBR, EBR, and GPT) and attached them using the following command:

export SERENITY_EXTRA_QEMU_ARGS="
  -drive file=/path/to/mbr.img,format=raw,index=1,media=disk
  -drive file=/path/to/ebr.img,format=raw,index=2,media=disk
  -drive file=/path/to/gpt.img,format=raw,index=3,media=disk"

1 files changed, 39 insertions, 0 deletions

diff --git a/Userland/Applications/PartitionEditor/PartitionModel.h b/Userland/Applications/PartitionEditor/PartitionModel.h
new file mode 100644
index 0000000000..65be6dac7f
--- /dev/null
+++ b/Userland/Applications/PartitionEditor/PartitionModel.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2022, Samuel Bowman <sam@sambowman.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Model.h>
+#include <LibPartition/PartitionTable.h>
+
+namespace PartitionEditor {
+
+class PartitionModel final : public GUI::Model {
+public:
+    enum Column {
+        Partition,
+        StartBlock,
+        EndBlock,
+        __Count,
+    };
+
+    static NonnullRefPtr<PartitionModel> create() { return adopt_ref(*new PartitionModel()); }
+    virtual ~PartitionModel() override = default;
+
+    virtual int row_count(GUI::ModelIndex const& = GUI::ModelIndex()) const override { return m_partition_table->partitions_count(); }
+    virtual int column_count(GUI::ModelIndex const& = GUI::ModelIndex()) const override { return Column::__Count; }
+    virtual String column_name(int) const override;
+    virtual GUI::Variant data(GUI::ModelIndex const&, GUI::ModelRole) const override;
+
+    ErrorOr<void> set_device_path(String const&);
+
+private:
+    PartitionModel() = default;
+
+    OwnPtr<Partition::PartitionTable> m_partition_table;
+};
+
+}