[PATCH 4 of 5] bundle2: add a UnsupportedPartError

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at fb.com>
# Date 1413368567 25200
#      Wed Oct 15 03:22:47 2014 -0700
# Node ID 91c0c243dae1d965bfb159c86445875188b9068a
# Parent  1d12b2282212d332b2e9caebaf7ee9f5b1092033
bundle2: add a UnsupportedPartError

We need the BundleValueError for format error not related to part support. So
we add a specific class for part-support errors.

diff --git a/mercurial/bundle2.py b/mercurial/bundle2.py
--- a/mercurial/bundle2.py
+++ b/mercurial/bundle2.py
@@ -319,19 +319,19 @@ def _processpart(op, part):
         # part key are matched lower case
         key = parttype.lower()
         try:
             handler = parthandlermapping.get(key)
             if handler is None:
-                raise error.BundleValueError(parttype=key)
+                raise error.UnsupportedPartError(parttype=key)
             op.ui.debug('found a handler for part %r\n' % parttype)
             unknownparams = part.mandatorykeys - handler.params
             if unknownparams:
                 unknownparams = list(unknownparams)
                 unknownparams.sort()
-                raise error.BundleValueError(parttype=key,
+                raise error.UnsupportedPartError(parttype=key,
                                                params=unknownparams)
-        except error.BundleValueError, exc:
+        except error.UnsupportedPartError, exc:
             if key != parttype: # mandatory parts
                 raise
             op.ui.debug('ignoring unsupported advisory part %s\n' % exc)
             return # skip to part processing
 
@@ -536,11 +536,11 @@ class unbundle20(unpackermixin):
         # Some logic will be later added here to try to process the option for
         # a dict of known parameter.
         if name[0].islower():
             self.ui.debug("ignoring unknown parameter %r\n" % name)
         else:
-            raise error.BundleValueError(params=(name,))
+            raise error.UnsupportedPartError(params=(name,))
 
 
     def iterparts(self):
         """yield all parts contained in the stream"""
         # make sure param have been loaded
@@ -890,11 +890,11 @@ def handlereplycaps(op, inpart):
         kwargs['parttype'] = parttype
     params = inpart.params.get('params')
     if params is not None:
         kwargs['params'] = params.split('\0')
 
-    raise error.BundleValueError(**kwargs)
+    raise error.UnsupportedPartError(**kwargs)
 
 @parthandler('b2x:error:pushraced', ('message',))
 def handlereplycaps(op, inpart):
     """Used to transmit push race error over the wire"""
     raise error.ResponseError(_('push failed:'), inpart.params['message'])
diff --git a/mercurial/error.py b/mercurial/error.py
--- a/mercurial/error.py
+++ b/mercurial/error.py
@@ -100,10 +100,11 @@ class PushRaced(RuntimeError):
 
 # bundle2 related errors
 class BundleValueError(ValueError):
     """error raised when bundle2 cannot be processed"""
 
+class UnsupportedPartError(BundleValueError):
     def __init__(self, parttype=None, params=()):
         self.parttype = parttype
         self.params = params
         if self.parttype is None:
             msg = 'Stream Parameter'