wireproto: implement capabilities for wire protocol v2 The capabilities mechanism for wire protocol version 2 represents a clean break from version 1. Instead of effectively exchanging a set of capabilities, we're exchanging a rich data structure. This data structure currently contains information about every available command, including its accepted arguments. It also contains information about supported compression formats. Exposing information about supported commands will allow clients to automatically generate bindings to the server. Clients will be able to do things like detect when they are attempting to run a command that isn't known to the server. Exposing the required permissions to run a command can be used by clients to determine if they have privileges to call a command before actually calling it. We could potentially even have clients send credentials preemptively without waiting for the server to deny the command request. Lots of potential here. The data returned by this command will likely evolve heavily. So we shouldn't bikeshed the implementation just yet. Differential Revision: https://phab.mercurial-scm.org/D3200

context: add deprecation warnings for deprecated types of changeids It's close to code freeze, and dropping support for repo['123'] and repo ['my-bookmark'] and repo['deadbeef'] is pretty dispruptive, so this just adds deprecation warnings so extensions can easily find the places they need to fix. Differential Revision: https://phab.mercurial-scm.org/D3197

revsymbol: stop delegating to repo.__getitem__ for unhandled symbols (API) The only remaining cases where we were delegating unhandled symbols to repo.__getitem__ should now be when the symbol could not be found. In that case we just delegated to repo.__getitem__ for the error message. Let's just copy the error message instead. If there were any cases where we got e.g. a binary nodeid or an integer revnum into revsymbol() (e.g. via repo.lookup()), we'd now start raising an exception instead. That is why this is marked (API). This affects one test case, but the new behavior seems better to me. I can't tell if the old behavior was desired or if the test was just there to document how it happened to work. Differential Revision: https://phab.mercurial-scm.org/D3196

context: handle partial nodeids in revsymbol() Similar reasoning as previous patches. Differential Revision: https://phab.mercurial-scm.org/D3195

context: handle namespaces in revsymbol() Similar reasoning as previous patches. Differential Revision: https://phab.mercurial-scm.org/D3194

scmutil: handle full hex nodeids in revsymbol() This is a bit unfortunate, but it enables moving other pieces out of changectx's constructor without affecting the order in which we look up things (e.g. hex nodeid before bookmark). We convert nodeid to revnum before calling repo.__getitem__, even though that will result in converting back to nodeid later. This is so we can handle the LookupError and attempt to interpret the string as something else (e.g. a bookmark). We also need to start handling WdirUnsupported now, since the full hex nodeid "ffff..." represents the working directory. The exception is raised by the revlog layer. Differential Revision: https://phab.mercurial-scm.org/D3193

context: handle stringified ints in revsymbol() This patch copies the handling of stringified ints from changectx's constructor. It then calls repo.__getitem__ with the int. Since that method only interprets integers as revnums the first thing it does, this will not be redoing any of the work already done. We leave the old code in place so we can later deprecate it instead of breaking extensions. Differential Revision: https://phab.mercurial-scm.org/D3146

py3: make sure we write bytes to file # skip-blame because just b'' prefix Differential Revision: https://phab.mercurial-scm.org/D3220

py3: workaround comparing NoneType and integers Comparing None with integers was fine in Python 2 but returns error in Python 3 which is nice. This patch replaces None with -1 where sorting is done and some related logic. Differential Revision: https://phab.mercurial-scm.org/D3219

py3: use sys.stdout instead of print in test-mq-qpush-fail.t Differential Revision: https://phab.mercurial-scm.org/D3218