register: don't send new Disks and Controllers data (#741)

The newer versions of jaypipes/ghw include a new type of Disk and
Controller in the Blocks section.

We use the library json serialization functionality: the deserialization
function of the older version of the library (0.9.0) would error out
when trying to decode serialized data of newer versions if they include
the new "virtual" drive or the new "loop" controller.
For now, just remove those devices.
Proper fix will be to better deal with this kind of errors avoiding
tearing down the registration process.

Signed-off-by: Francesco Giudici <[email protected]>
(cherry picked from commit 3379c85)

pkg/hostinfo/hostinfo.go

@@ -220,3 +220,19 @@ func FillData(data []byte) (map[string]interface{}, error) {
 
 	return labels, nil
 }
+
+// Prune() filters out new Disks and Controllers introduced in ghw/pkg/block > 0.9.0
+// see: https://github.com/rancher/elemental-operator/issues/733
+func Prune(data *HostInfo) {
+	prunedDisks := []*block.Disk{}
+	for i := 0; i < len(data.Block.Disks); i++ {
+		if data.Block.Disks[i].DriveType > block.DRIVE_TYPE_SSD {
+			continue
+		}
+		if data.Block.Disks[i].StorageController > block.STORAGE_CONTROLLER_MMC {
+			continue
+		}
+		prunedDisks = append(prunedDisks, data.Block.Disks[i])
+	}
+	data.Block.Disks = prunedDisks
+}

pkg/register/register.go

@@ -267,6 +267,9 @@ func sendSystemData(conn *websocket.Conn) error {
 	if err != nil {
 		return fmt.Errorf("reading system data: %w", err)
 	}
+	// preserve compatibility with older Elemental Operators
+	hostinfo.Prune(data)
+
 	err = SendJSONData(conn, MsgSystemData, data)
 	if err != nil {
 		log.Debugf("system data:\n%s", litter.Sdump(data))