bundle2: enforce all parameters in a part to be handled

Once we picked a handler, we check that all mandatory parameter keys are
properly supported. If not we raise an exception.

We added a test for this case.

The code now fails for any part with unknown mandatory parameters. We will
ignore such errors for advisory parts in a later changeset.

mercurial/bundle2.py

@@ -306,6 +306,12 b' def processbundle(repo, unbundler, trans'
                 part.read()
                 continue
 
+            unknownparams = part.mandatorykeys - handler.params
+            if unknownparams:
+                unknownparams = list(unknownparams)
+                unknownparams.sort()
+                raise error.BundleValueError(parttype=key, params=unknownparams)
+
             # handler is called outside the above try block so that we don't
             # risk catching KeyErrors from anything other than the
             # parthandlermapping lookup (any KeyError raised by handler()

tests/test-bundle2.t

@@ -64,6 +64,7 b' Create an extension to test bundle2 API'
   > @command('bundle2',
   >          [('', 'param', [], 'stream level parameter'),
   >           ('', 'unknown', False, 'include an unknown mandatory part in the bundle'),
+  >           ('', 'unknownparams', False, 'include an unknown part parameters in the bundle'),
   >           ('', 'parts', False, 'include some arbitrary parts to the bundle'),
   >           ('', 'reply', False, 'produce a reply bundle'),
   >           ('', 'pushrace', False, 'includes a check:head part with unknown nodes'),
@@ -113,6 +114,8 b' Create an extension to test bundle2 API'
   >        mathpart.data = '42'
   >     if opts['unknown']:
   >        bundler.newpart('test:UNKNOWN', data='some random content')
+  >     if opts['unknownparams']:
+  >        bundler.newpart('test:SONG', [('randomparams', '')])
   >     if opts['parts']:
   >        bundler.newpart('test:ping')
   > 
@@ -540,6 +543,16 b' Unbundle with an unknown mandatory part'
   abort: missing support for test:unknown
   [255]
 
+Unbundle with an unknown mandatory part parameters
+(should abort)
+
+  $ hg bundle2 --unknownparams ../unknown.hg2
+
+  $ hg unbundle2 < ../unknown.hg2
+  0 unread bytes
+  abort: missing support for test:song - randomparams
+  [255]
+
 unbundle with a reply
 
   $ hg bundle2 --parts --reply ../parts-reply.hg2