Return logs (ZIL) vdev as well in VDevTree

.gitignore

@@ -1,2 +1,3 @@
 .gitconfig
 *.sublime-*
+go-libzfs.test

zpool.go

@@ -103,7 +103,7 @@ type VDevTree struct {
 	Devices  []VDevTree // groups other devices (e.g. mirror)
 	Spares   []VDevTree
 	L2Cache  []VDevTree
-	Logs     []VDevTree
+	Logs     *VDevTree
 	Parity   uint
 	Path     string
 	Name     string
@@ -222,9 +222,7 @@ func poolGetConfig(name string, nv C.nvlist_ptr) (vdevs VDevTree, err error) {
 		var islog = C.uint64_t(C.B_FALSE)
 
 		islog = C.get_vdev_is_log(C.nvlist_array_at(children.first, c))
-		if islog != C.B_FALSE {
+
-			continue
-		}
 		vname := C.zpool_vdev_name(C.libzfsHandle, nil, C.nvlist_array_at(children.first, c),
 			C.B_TRUE)
 		var vdev VDevTree
@@ -234,13 +232,11 @@ func poolGetConfig(name string, nv C.nvlist_ptr) (vdevs VDevTree, err error) {
 		if err != nil {
 			return
 		}
-		vdevs.Devices = append(vdevs.Devices, vdev)
+		if islog != C.B_FALSE {
-	}
+			vdevs.Logs = &vdev
-	if vdevs.Spares, err = poolGetSpares(name, nv); err != nil {
+		} else {
-		return
+			vdevs.Devices = append(vdevs.Devices, vdev)
-	}
+		}
-	if vdevs.L2Cache, err = poolGetL2Cache(name, nv); err != nil {
-		return
 	}
 	return
 }

zpool_test.go

@@ -1,6 +1,7 @@
 package zfs_test
 
 import (
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -529,3 +530,34 @@ func ExamplePool_State() {
 	}
 	println("POOL TESTPOOL state:", zfs.PoolStateToName(pstate))
 }
+
+func TestPool_VDevTree(t *testing.T) {
+	type fields struct {
+		poolName string
+	}
+	tests := []struct {
+		name    string
+		fields  fields
+		wantErr bool
+	}{
+		// TODO: Add test cases.
+		{
+			name:    "test1",
+			fields:  fields{"NETSTOR"},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			pool, _ := zfs.PoolOpen(tt.fields.poolName)
+			defer pool.Close()
+			gotVdevs, err := pool.VDevTree()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Pool.VDevTree() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			jsonData, _ := json.MarshalIndent(gotVdevs, "", "\t")
+			t.Logf("gotVdevs: %s", string(jsonData))
+		})
+	}
+}