[PATCH 5 of 5] bundle2.bundlepart: remove detection of mandatory bit from parttype

[Eric Sumner]

# HG changeset patch
# User Eric Sumner <ericsumner at fb.com>
# Date 1418766795 28800
#      Tue Dec 16 13:53:15 2014 -0800
# Node ID 78a3d81227cbda2bfe5dcc134b8f16a20ab3c7e9
# Parent  9729f1cb29923ab0e4f2bad7a0b8193dbbd87a70
bundle2.bundlepart: remove detection of mandatory bit from parttype

Encoding whether or not a part is mandatory in the capitalization of the
parttype is unintuitive and error-prone.  This sequence of patches separates
these concerns in the API to reduce programmer error and pave the way for
a potential change in how this information is transmitted over the wire.

This diff removes the ability to use a capitalized parttype to indicate a
mandatory part, instead requiring it to be set via a
separate parameter/property.  In order to provide a transition period for
extension authors, it may make sense to delay applying this patch for a few
weeks.

diff --git a/mercurial/bundle2.py b/mercurial/bundle2.py
--- a/mercurial/bundle2.py
+++ b/mercurial/bundle2.py
@@ -588,7 +588,7 @@
     """
 
     def __init__(self, parttype, mandatoryparams=(), advisoryparams=(),
-                 data='', mandatory = 'UNSPECIFIED'):
+                 data='', mandatory = False):
         self.id = None
         self.type = parttype
         self._data = data
@@ -605,10 +605,7 @@
         # - False: currently generated,
         # - True: generation done.
         self._generated = None
-        if mandatory is 'UNSPECIFIED':
-            self._mandatory = None
-        else:
-            self._mandatory = bool(mandatory)
+        self._mandatory = bool(mandatory)
 
     # methods used to defines the part content
     def __setdata(self, data):
@@ -631,11 +628,7 @@
 
     @property
     def mandatory(self):
-        if self._mandatory is None:
-            # remove this autodetect once everything uses the new API
-            return self.type != self.type.lower()
-        else:
-            return self._mandatory
+        return self._mandatory
 
     @mandatory.setter
     def mandatory(self, value):