Implement setup, wipe, restore, and backup for Coldcard with tests

The Coldcard does not support setup, wipe, and restore via software, so just
raise errors for those.

Backup is supported, so implemented.

hwilib/devices/coldcard.py

@@ -1,6 +1,6 @@
 # Trezor interaction script
 
-from ..hwwclient import HardwareWalletClient
+from ..hwwclient import HardwareWalletClient, UnavailableActionError
 from ckcc.client import ColdcardDevice, COINKITE_VID, CKCC_PID
 from ckcc.protocol import CCProtocolPacker
 from ckcc.constants import MAX_BLK_LEN
@@ -102,19 +102,39 @@ class ColdcardClient(HardwareWalletClient):
 
     # Setup a new device
     def setup_device(self, label='', passphrase=''):
-        raise NotImplementedError('The Coldcard does not currently implement setup')
+        raise UnavailableActionError('The Coldcard does not support software setup')
 
     # Wipe this device
     def wipe_device(self):
-        raise NotImplementedError('The Coldcard does not currently implement wipe')
+        raise UnavailableActionError('The Coldcard does not support wiping via software')
 
     # Restore device from mnemonic or xprv
     def restore_device(self, label=''):
-        raise NotImplementedError('The Coldcard does not implement device restoring')
+        raise UnavailableActionError('The Coldcard does not support restoring via software')
 
     # Begin backup process
     def backup_device(self, label='', passphrase=''):
-        raise NotImplementedError('The Coldcard does not implement this method')
+        self.device.check_mitm()
+
+        ok = self.device.send_recv(CCProtocolPacker.start_backup())
+        assert ok == None
+
+        while 1:
+            time.sleep(0.250)
+            done = self.device.send_recv(CCProtocolPacker.get_backup_file(), timeout=None)
+            if done == None:
+                continue
+            break
+
+        if len(done) != 2:
+            raise ValueError('Failed: %r' % done)
+
+        result_len, result_sha = done
+
+        result = self.device.download_file(result_len, result_sha, file_number=0)
+        filename = time.strftime('backup-%Y%m%d-%H%M.7z')
+        open(filename, 'wb').write(result)
+        return {'success': True, 'message': 'The backup has be written to {}'.format(filename)}
 
     # Close the device
     def close(self):

test/test_coldcard.py

@@ -27,8 +27,25 @@ def coldcard_test_suite(simulator, rpc, userpass):
         resp = dev.send_recv(CCProtocolPacker.logout())
     atexit.register(cleanup_simulator)
 
+    # Coldcard specific setup and wipe tests
+    class TestColdcardSetupWipe(DeviceTestCase):
+        def test_setup(self):
+            result = process_commands(self.dev_args + ['setup'])
+            self.assertIn('error', result)
+            self.assertIn('code', result)
+            self.assertEqual(result['error'], 'The Coldcard does not support software setup')
+            self.assertEqual(result['code'], -9)
+
+        def test_wipe(self):
+            result = process_commands(self.dev_args + ['wipe'])
+            self.assertIn('error', result)
+            self.assertIn('code', result)
+            self.assertEqual(result['error'], 'The Coldcard does not support wiping via software')
+            self.assertEqual(result['code'], -9)
+
     # Generic device tests
     suite = unittest.TestSuite()
+    suite.addTest(DeviceTestCase.parameterize(TestColdcardSetupWipe, rpc, userpass, 'coldcard', '/tmp/ckcc-simulator.sock', '0f056943', ''))
     suite.addTest(DeviceTestCase.parameterize(TestDeviceConnect, rpc, userpass, 'coldcard', '/tmp/ckcc-simulator.sock', '0f056943', 'tpubDDpWvmUrPZrhSPmUzCMBHffvC3HyMAPnWDSAQNBTnj1iZeJa7BZQEttFiP4DS4GCcXQHezdXhn86Hj6LHX5EDstXPWrMaSneRWM8yUf6NFd'))
     suite.addTest(DeviceTestCase.parameterize(TestGetKeypool, rpc, userpass, 'coldcard', '/tmp/ckcc-simulator.sock', '0f056943', 'tpubDDpWvmUrPZrhSPmUzCMBHffvC3HyMAPnWDSAQNBTnj1iZeJa7BZQEttFiP4DS4GCcXQHezdXhn86Hj6LHX5EDstXPWrMaSneRWM8yUf6NFd'))
     # HACK: Skip this in headless simulator because it requires user input