changegroup: add v4 changegroup for revlog v2 exchange This change only adds the required infrastructure for the new changegroup format and does not do any actual exchange. This will be done in the next patches. Differential Revision: https://phab.mercurial-scm.org/D10026

revlogv2: don't assume that the sidedata of the last rev is right after data We are going to be rewriting sidedata soon, it's going to be appended to the revlog data file, meaning that the data and the sidedata might not be contiguous. Differential Revision: https://phab.mercurial-scm.org/D10025

sidedata: move to new sidedata storage in revlogv2 The current (experimental) sidedata system uses flagprocessors to signify the presence and store/retrieve sidedata from the raw revlog data. This proved to be quite fragile from an exchange perspective and a lot more complex than simply having a dedicated space in the new revlog format. This change does not handle exchange (ironically), so the test for amend - that uses a bundle - is broken. This functionality is split into the next patches. Differential Revision: https://phab.mercurial-scm.org/D9993

cext: add support for revlogv2 This enables the C code to retrieve/create entries in the revlog v2 format. This is mainly a matter of taking into account the additional slots for sidedata, etc. Differential Revision: https://phab.mercurial-scm.org/D9846

bitmanipulation: add utils to read/write bigendian 64bit integers Differential Revision: https://phab.mercurial-scm.org/D9845

format: remove sidedata format variant This format variant can only exist when also using revlog v2, so it's useless now. Differential Revision: https://phab.mercurial-scm.org/D10113

revlogv2: allow upgrading to v2 Revlogv2 implies sidedata. Right now sidedata is not really used in production, and Revlogv2 will be used for the first production-ready version of sidedata support. Differential Revision: https://phab.mercurial-scm.org/D9844

revlog: introduce v2 format As documented in [1], this is still tentative and could be subject to change, but we need to lay down the foundations in order to work on the next abstraction layers. [1] https://www.mercurial-scm.org/wiki/RevlogV2Plan Differential Revision: https://phab.mercurial-scm.org/D9843

formatting: fix redundant parentheses These were introduced by 0d055849d5f9d682ef931d2566b760d5c6bf7e52. Differential Revision: https://phab.mercurial-scm.org/D10229

wsgicgi: switch the default PATH_INFO back to str It looks like everything here is meant to be str, and regressed in 687b865b95ad. Pytype didn't flag this, but is really confused about the range of possible types for the dictionary values, and flagged missing `lower()` on various types in this area. Differential Revision: https://phab.mercurial-scm.org/D10204

crecord: convert an instance of bytes to str Caught by pytype: File "/mnt/c/Users/Matt/hg/mercurial/crecord.py", line 1154, in printstring: Function _CursesWindow.addstr was called with the wrong arguments [wrong-arg-types] Expected: (self, str: str, ...) Actually passed: (self, str: bytes, ...) Differential Revision: https://phab.mercurial-scm.org/D10203

crecord: change str literals to byte literals Differential Revision: https://phab.mercurial-scm.org/D10202