configitems: register the 'convert.cvsps.cache' config The convert extensions has code a bit all around, but it seems simpler to use a central declaration of options at the root first.

bundle2: move exception handling into part iterator As part of separating the part iteration logic from the part handling logic, let's move the exception handling to the part iterator class. Differential Revision: https://phab.mercurial-scm.org/D705

bundle2: move part counter to partiterator As part of moving the part iterator logic to a separate class, let's move the part counting logic and the output for it. Differential Revision: https://phab.mercurial-scm.org/D704

bundle2: move part iterator a separate class Currently, the part iterator logic is tightly coupled with the part handling logic, which means it's hard to replace the part handling logic without duplicating the part iterator bits. In a future diff we'll want to be able to replace all part handling, so let's begin refactoring the part iterator logic to it's own class. Differential Revision: https://phab.mercurial-scm.org/D703

changegroup: add source parameter to generatemanifests Extensions, like remotefilelog, will want to look at the source of a pull when determining what manifests to add to a changegroup. For instance, on push they will include everything, while on pull they won't. Differential Revision: https://phab.mercurial-scm.org/D686

changegroup: remove changegroup dependency from revlog.addgroup Previously revlog.addgroup would accept a changegroup and a linkmapper and use it to iterate of the deltas. As part of untangling the revlog-changegroup interdependency, let's move the changegroup delta iteration logic to it's own function and pass the simple iterator to the revlog instead. This will make it easier to introduce non-revlogs stores in the future, without reinventing any changegroup specific logic. Differential Revision: https://phab.mercurial-scm.org/D688

revlog: refactor chain variable Previously the addgroup loop would set chain to be the result of self._addrevision(node,...). Since _addrevision now always returns the passed in node, we can drop that behavior and just always set chain = node in the loop. This will be useful in a future patch where we refactor the cg.deltachunk logic to another function and therefore chain disappears entirely from this function. Differential Revision: https://phab.mercurial-scm.org/D699