Add backup command and device class methods for backing up

hwilib/commands.py

@@ -224,6 +224,14 @@ def restore_device(args, client):
     except ValueError as e:
         return {'error': str(e), 'code': BAD_ARGUMENT}
 
+def backup_device(args, client):
+    try:
+        return client.backup_device(args.label, args.backup_passphrase)
+    except UnavailableActionError as e:
+        return {'error': str(e), 'code': UNAVAILABLE_ACTION}
+    except ValueError as e:
+        return {'error': str(e), 'code': BAD_ARGUMENT}
+
 def process_commands(args):
     parser = argparse.ArgumentParser(description='Access and send commands to a hardware wallet device. Responses are in JSON format')
     parser.add_argument('--device-path', '-d', help='Specify the device path of the device to connect to')
@@ -286,6 +294,11 @@ def process_commands(args):
     restore_parser.add_argument('--label', '-l', help='The name to give to the device', default='')
     restore_parser.set_defaults(func=restore_device)
 
+    backup_parser = subparsers.add_parser('backup', help='Initiate the device backup creation process')
+    backup_parser.add_argument('--label', '-l', help='The name to give to the device', default='')
+    backup_parser.add_argument('--backup_passphrase', '-b', help='The passphrase to use for the backup, if applicable', default='')
+    backup_parser.set_defaults(func=backup_device)
+
     args = parser.parse_args(args)
 
     device_path = args.device_path

hwilib/devices/coldcard.py

@@ -112,6 +112,10 @@ class ColdcardClient(HardwareWalletClient):
     def restore_device(self, label=''):
         raise NotImplementedError('The Coldcard does not implement device restoring')
 
+    # Begin backup process
+    def backup_device(self, label='', passphrase=''):
+        raise NotImplementedError('The Coldcard does not implement this method')
+
     # Close the device
     def close(self):
         self.device.close()

hwilib/devices/digitalbitbox.py

@@ -366,6 +366,10 @@ class DigitalbitboxClient(HardwareWalletClient):
     def restore_device(self, label=''):
         raise NotImplementedError('The Digital Bitbox does not implement device restoring')
 
+    # Begin backup process
+    def backup_device(self, label='', passphrase=''):
+        raise NotImplementedError('The Digital BitBox does not implement this method')
+
     # Close the device
     def close(self):
         self.device.close()

hwilib/devices/keepkey.py

@@ -191,6 +191,10 @@ class KeepkeyClient(HardwareWalletClient):
     def restore_device(self, label=''):
         raise NotImplementedError('The Keepkey does not implement device restoring')
 
+    # Begin backup process
+    def backup_device(self, label='', passphrase=''):
+        raise NotImplementedError('The Keepkey does not implement this method')
+
     # Close the device
     def close(self):
         self.client.close()

hwilib/devices/ledger.py

@@ -259,6 +259,10 @@ class LedgerClient(HardwareWalletClient):
     def restore_device(self, label=''):
         raise NotImplementedError('The Ledger Nano S does not implement device restoring')
 
+    # Begin backup process
+    def backup_device(self, label='', passphrase=''):
+        raise NotImplementedError('The Ledger Nano S does not implement this method')
+
     # Close the device
     def close(self):
         self.dongle.close()

hwilib/devices/trezor.py

@@ -202,6 +202,10 @@ class TrezorClient(HardwareWalletClient):
     def restore_device(self, label=''):
         raise NotImplementedError('The Trezor does not implement device restoring')
 
+    # Begin backup process
+    def backup_device(self, label='', passphrase=''):
+        raise NotImplementedError('The Trezor does not implement this method')
+
     # Close the device
     def close(self):
         self.client.close()

hwilib/hwwclient.py

@@ -45,6 +45,10 @@ class HardwareWalletClient(object):
     def restore_device(self, label=''):
         raise NotImplementedError('The HardwareWalletClient base class does not implement this method')
 
+    # Begin backup process
+    def backup_device(self, label='', passphrase=''):
+        raise NotImplementedError('The HardwareWalletClient base class does not implement this method')
+
     # Close the device
     def close(self):
         raise NotImplementedError('The HardwareWalletClient base class does not '