From afa4cbfcbb8e552d1bc59147b5b109a0f6c08599 Mon Sep 17 00:00:00 2001
From: SomberNight <somber.night@protonmail.com>
Date: Thu, 15 Mar 2018 18:34:30 +0100
Subject: [PATCH] fix #4082

---
 lib/plugins.py           |  2 +-
 plugins/trezor/trezor.py | 42 ++++++++++++++++++++++++++++++++++++----
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/lib/plugins.py b/lib/plugins.py
index dcac6145b..2406c56ac 100644
--- a/lib/plugins.py
+++ b/lib/plugins.py
@@ -466,7 +466,7 @@ class DeviceMgr(ThreadJob, PrintError):
         devices = [dev for dev in devices if not self.xpub_by_id(dev.id_)]
         infos = []
         for device in devices:
-            if not device.product_key in plugin.DEVICE_IDS:
+            if device.product_key not in plugin.DEVICE_IDS:
                 continue
             client = self.create_client(device, handler, plugin)
             if not client:
diff --git a/plugins/trezor/trezor.py b/plugins/trezor/trezor.py
index d9da690eb..5f6798243 100644
--- a/plugins/trezor/trezor.py
+++ b/plugins/trezor/trezor.py
@@ -126,7 +126,11 @@ class TrezorPlugin(HW_PluginBase):
 
         self.device_manager().register_enumerate_func(self.enumerate)
 
-    def enumerate(self):
+    @staticmethod
+    def _all_transports():
+        """Reimplemented trezorlib.transport.all_transports for old trezorlib.
+        Remove this when we start to require trezorlib 0.9.2
+        """
         try:
             from trezorlib.transport import all_transports
         except ImportError:
@@ -154,9 +158,14 @@ class TrezorPlugin(HW_PluginBase):
                 except BaseException:
                     pass
                 return transports
+        return all_transports()
 
+    def _enumerate_devices(self):
+        """Just like trezorlib.transport.enumerate_devices,
+        but with exception catching, so that transports can fail separately.
+        """
         devices = []
-        for transport in all_transports():
+        for transport in self._all_transports():
             try:
                 new_devices = transport.enumerate()
             except BaseException as e:
@@ -164,14 +173,39 @@ class TrezorPlugin(HW_PluginBase):
                                  .format(transport.__name__, str(e)))
             else:
                 devices.extend(new_devices)
+        return devices
 
+    def enumerate(self):
+        devices = self._enumerate_devices()
         return [Device(d.get_path(), -1, d.get_path(), 'TREZOR', 0) for d in devices]
 
+    def _get_transport(self, path=None):
+        """Reimplemented trezorlib.transport.get_transport for old trezorlib.
+        Remove this when we start to require trezorlib 0.9.2
+        """
+        try:
+            from trezorlib.transport import get_transport
+        except ImportError:
+            # compat for trezorlib < 0.9.2
+            def get_transport(path=None, prefix_search=False):
+                if path is None:
+                    try:
+                        return self._enumerate_devices()[0]
+                    except IndexError:
+                        raise Exception("No TREZOR device found") from None
+
+                def match_prefix(a, b):
+                    return a.startswith(b) or b.startswith(a)
+                transports = [t for t in self._all_transports() if match_prefix(path, t.PATH_PREFIX)]
+                if transports:
+                    return transports[0].find_by_path(path)
+                raise Exception("Unknown path prefix '%s'" % path)
+        return get_transport(path)
+
     def create_client(self, device, handler):
-        from trezorlib.device import TrezorDevice
         try:
             self.print_error("connecting to device at", device.path)
-            transport = TrezorDevice.find_by_path(device.path)
+            transport = self._get_transport(device.path)
         except BaseException as e:
             self.print_error("cannot connect at", device.path, str(e))
             return None