feat: add -skip-validation flag

Allow bypassing the schema check so a user on a newer Talos version
(with a config that uses fields this tool's schema does not yet know
about) can still write META without waiting for the tool to bump its
machinery dependency.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

Author: kvaps

README.md

@@ -18,3 +18,5 @@ talos-meta-tool -device /dev/sda -config config.yaml
 The `-device` flag accepts the full disk (e.g. `/dev/sda`); the META partition is discovered automatically via GPT.
 
 The `-config` file is validated against the Talos v1.13 metal network configuration schema (`network.PlatformConfigSpec`) before writing: unknown fields, malformed addresses and invalid enum values are rejected.
+
+To bypass validation — e.g. when the config uses fields that a newer Talos version has added but this tool's schema does not yet know about — pass `-skip-validation`.

main.go

@@ -90,6 +90,7 @@ func writeConfig(dev interface{ io.ReaderAt; io.WriterAt }, configData []byte) e
 func main() {
 	devicePath := flag.String("device", "", "Path to the disk device (e.g., /dev/sda)")
 	configPath := flag.String("config", "", "Path to the configuration file (e.g., config.yaml)")
+	skipValidation := flag.Bool("skip-validation", false, "Skip schema validation of the configuration file")
 	flag.Parse()
 
 	if *devicePath == "" || *configPath == "" {
@@ -102,8 +103,10 @@ func main() {
 		log.Fatalf("Error reading configuration file: %v", err)
 	}
 
-	if err := validateConfig(configData); err != nil {
-		log.Fatalf("Invalid network configuration: %v", err)
+	if !*skipValidation {
+		if err := validateConfig(configData); err != nil {
+			log.Fatalf("Invalid network configuration: %v", err)
+		}
 	}
 
 	device, err := os.OpenFile(*devicePath, os.O_RDWR, 0)