Pull request 2111: 6545-schema-version

Updates #6545.

Squashed commit of the following:

commit b1969128a99ff21c97feb4e7805b4b8133d7122f
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Dec 15 20:04:37 2023 +0300

    home: fix import

commit 872ccea1491a8da76cc24db79247438d0ce4d256
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Dec 15 20:01:15 2023 +0300

    all: output schema version

internal/configmigrate/v6.go

@@ -0,0 +1,56 @@
+package configmigrate
+
+import "fmt"
+
+// migrateTo6 performs the following changes:
+//
+//	# BEFORE:
+//	'schema_version': 5
+//	'clients':
+//	 - # …
+//	   'ip': '127.0.0.1'
+//	   'mac': 'AA:AA:AA:AA:AA:AA'
+//	  # …
+//	# …
+//
+//	# AFTER:
+//	'schema_version': 6
+//	'clients':
+//	 - # …
+//	   'ip': '127.0.0.1'
+//	   'mac': 'AA:AA:AA:AA:AA:AA'
+//	   'ids':
+//	   - '127.0.0.1'
+//	   - 'AA:AA:AA:AA:AA:AA'
+//	  # …
+//	# …
+func migrateTo6(diskConf yobj) (err error) {
+	diskConf["schema_version"] = 6
+
+	clients, ok, err := fieldVal[yarr](diskConf, "clients")
+	if !ok {
+		return err
+	}
+
+	for i, client := range clients {
+		var c yobj
+		c, ok = client.(yobj)
+		if !ok {
+			return fmt.Errorf("unexpected type of client at index %d: %T", i, client)
+		}
+
+		ids := yarr{}
+		for _, id := range []string{"ip", "mac"} {
+			val, _, valErr := fieldVal[string](c, id)
+			if valErr != nil {
+				return fmt.Errorf("client at index %d: %w", i, valErr)
+			} else if val != "" {
+				ids = append(ids, val)
+			}
+		}
+
+		c["ids"] = ids
+	}
+
+	return nil
+}