feat(agent): zfs collector for pools + datasets/snapshots with fixture tests

agent/test/proxmox_agent/collectors/zfs_test.exs

@@ -0,0 +1,62 @@
+defmodule ProxmoxAgent.Collectors.ZfsTest do
+  use ExUnit.Case, async: true
+
+  alias ProxmoxAgent.Collectors.Zfs
+
+  @fixtures Path.expand("../../fixtures/zfs", __DIR__)
+
+  defp fake_runner do
+    fn
+      "zpool", ["list", "-j", "--json-int"] ->
+        {:ok, File.read!(Path.join(@fixtures, "zpool_list.json"))}
+
+      "zpool", ["status", "-j", "--json-flat-vdevs", "--json-int"] ->
+        {:ok, File.read!(Path.join(@fixtures, "zpool_status.json"))}
+
+      "zfs", ["list", "-j", "--json-int", "-t", "all"] ->
+        {:ok, File.read!(Path.join(@fixtures, "zfs_list.json"))}
+    end
+  end
+
+  describe "collect_pools/1" do
+    test "returns a summary per pool" do
+      sample = Zfs.collect_pools(runner: fake_runner())
+      assert is_list(sample.pools)
+      assert length(sample.pools) == 2
+      rpool = Enum.find(sample.pools, &(&1.name == "rpool"))
+      tank = Enum.find(sample.pools, &(&1.name == "tank"))
+
+      assert rpool.health == "ONLINE"
+      assert rpool.capacity_percent == 40
+      assert rpool.fragmentation_percent == 17
+      assert rpool.size_bytes == 500_000_000_000
+      assert rpool.error_count == 0
+      assert rpool.degraded_vdev_count == 0
+
+      assert tank.health == "DEGRADED"
+      assert tank.error_count == 2
+      assert tank.degraded_vdev_count == 1
+    end
+
+    test "populates errors list when zpool fails" do
+      failing = fn _, _ -> {:error, {:enoent, "zpool"}} end
+      sample = Zfs.collect_pools(runner: failing)
+      assert sample.pools == []
+      assert length(sample.errors) >= 1
+    end
+  end
+
+  describe "collect_datasets/1" do
+    test "returns datasets and per-dataset snapshot summary" do
+      sample = Zfs.collect_datasets(runner: fake_runner())
+      assert length(sample.datasets) == 2
+
+      rpool_data = Enum.find(sample.datasets, &(&1.name == "rpool/data"))
+      assert rpool_data.used_bytes == 100_000_000_000
+      assert rpool_data.usedbysnapshots_bytes == 2_000_000_000
+      assert rpool_data.snapshot_count == 2
+      assert rpool_data.newest_snapshot_unix == 1_745_193_600
+      assert rpool_data.oldest_snapshot_unix == 1_745_107_200
+    end
+  end
+end