feat(agent): pvesh storage collector

agent/test/fixtures/pvesh/storage.json

@@ -0,0 +1,35 @@
+[
+  {
+    "storage": "local",
+    "type": "dir",
+    "content": "backup,iso,vztmpl",
+    "active": 1,
+    "enabled": 1,
+    "used": 50000000000,
+    "total": 500000000000,
+    "avail": 450000000000,
+    "used_fraction": 0.1
+  },
+  {
+    "storage": "local-zfs",
+    "type": "zfspool",
+    "content": "images,rootdir",
+    "active": 1,
+    "enabled": 1,
+    "used": 200000000000,
+    "total": 500000000000,
+    "avail": 300000000000,
+    "used_fraction": 0.4
+  },
+  {
+    "storage": "backup-nfs",
+    "type": "nfs",
+    "content": "backup",
+    "active": 0,
+    "enabled": 1,
+    "used": 0,
+    "total": 0,
+    "avail": 0,
+    "used_fraction": 0.0
+  }
+]

agent/test/proxmox_agent/collectors/storage_test.exs

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+defmodule ProxmoxAgent.Collectors.StorageTest do
+  use ExUnit.Case, async: true
+
+  alias ProxmoxAgent.Collectors.Storage
+
+  @fixtures Path.expand("../../fixtures/pvesh", __DIR__)
+
+  defp fake_runner do
+    fn
+      "pvesh", ["get", "/nodes/" <> _, "--output-format", "json"] ->
+        {:ok, File.read!(Path.join(@fixtures, "storage.json"))}
+    end
+  end
+
+  test "returns one summary per storage entry" do
+    sample = Storage.collect(node: "pve-01", runner: fake_runner())
+
+    assert length(sample.storages) == 3
+    local = Enum.find(sample.storages, &(&1.name == "local"))
+    assert local.type == "dir"
+    assert local.active == true
+    assert local.used_bytes == 50_000_000_000
+    assert local.total_bytes == 500_000_000_000
+    assert local.content == "backup,iso,vztmpl"
+
+    nfs = Enum.find(sample.storages, &(&1.name == "backup-nfs"))
+    assert nfs.active == false
+  end
+
+  test "populates errors on failure" do
+    failing = fn _, _ -> {:error, {:enoent, "pvesh"}} end
+    sample = Storage.collect(node: "pve-01", runner: failing)
+    assert sample.storages == []
+    assert sample.errors != []
+  end
+end