txcreate, txsign: enforce cfg.autosign if cfg.coin == 'XMR'

mmgen/main_txcreate.py

@@ -33,6 +33,7 @@ opts_data = {
 		'swaptx': ['-', 's'],
 	}[target],
 	'sets': [('yes', True, 'quiet', True)],
+	'requires': [('coin', 'XMR', 'autosign', True)],
 	'text': {
 		'desc': {
 			'tx':     f'Create a transaction with outputs to specified coin or {gc.proj_name} addresses',

mmgen/main_txsend.py

@@ -155,6 +155,8 @@ async def process_tx(tx):
 	cfg._util.vmsg(f'Getting {tx.desc} ‘{tx.infile}’')
 
 	if tx.is_compat:
+		if not cfg.autosign:
+			die(1, 'Sending XMR transaction via compatibility layer requires --autosign')
 		return await tx.compat_send()
 
 	txcfg = Config({'_clone': cfg, 'proto': tx.proto, 'coin': tx.proto.coin})