wireprotov2peer: properly format errors

formatrichmessage() expects an iterable containing dicts with
well-defined keys. We were passing in something else. This caused
an exception.

Change the code to call formatrichmessage() with the proper argument.

And add a TODO to potentially emit the proper data structure from
the server in the first place.

Differential Revision: https://phab.mercurial-scm.org/D4441

mercurial/wireprotoframing.py

@@ -419,6 +419,8 b' def createbytesresponseframesfromgen(str'
                            payload=b'')
 
 def createcommanderrorresponse(stream, requestid, message, args=None):
+    # TODO should this be using a list of {'msg': ..., 'args': {}} so atom
+    # formatting works consistently?
     m = {
         b'status': b'error',
         b'error': {

mercurial/wireprotov2peer.py

@@ -27,7 +27,7 b' def formatrichmessage(atoms):'
         msg = _(atom[b'msg'])
 
         if b'args' in atom:
-            msg = msg % atom[b'args']
+            msg = msg % tuple(atom[b'args'])
 
         chunks.append(msg)
 
@@ -163,8 +163,10 b' class clienthandler(object):'
                 if overall['status'] == 'ok':
                     self._futures[frame.requestid].set_result(decoder(objs))
                 else:
-                    e = error.RepoError(
-                        formatrichmessage(overall['error']['message']))
+                    atoms = [{'msg': overall['error']['message']}]
+                    if 'args' in overall['error']:
+                        atoms[0]['args'] = overall['error']['args']
+                    e = error.RepoError(formatrichmessage(atoms))
                     self._futures[frame.requestid].set_exception(e)
             else:
                 self._futures[frame.requestid].set_result(response)