wireproto: config options to disable bundle1 bundle2 is the new and preferred wire protocol format. For various reasons, server operators may wish to force clients to use it. One reason is performance. If a repository is stored in generaldelta, the server must recompute deltas in order to produce the bundle1 changegroup. This can be extremely expensive. For mozilla-central, bundle generation typically takes a few minutes. However, generating a non-gd bundle from a generaldelta encoded mozilla-central requires over 30 minutes of CPU! If a large repository like mozilla-central were encoded in generaldelta and non-gd clients connected, they could easily flood a server by cloning. This patch gives server operators config knobs to control whether bundle1 is allowed for push and pull operations. The default is to support legacy bundle1 clients, making this patch backwards compatible.

dockerlib: short form for non-unique uid/gid for CentOS 5 compat (issue4977) CentOS 5 does not support '--non-unique', but does support the short '-o'.

exchange: standalone function to determine if bundle2 is requested This will be used in a subsequent patch.

wireproto: add docstring for wirepeer

commit: add some help examples (issue4963) Includes documenting --date now, which resolves the above issue.

changegroup: restate file linknode callback using generator expressions I think this is slightly clearer, and it nicely avoids an extra nested function.

changegroup: clean up file lookup function One case is basically degenerate, so just extract it and make the function clearer.

changegroup: remove one special case from lookupmflinknode In the fastpathlinkrev case, lookupmflinknode was a very complicated way of saying mfs.__getitem__, so let's just get that case out of our way so it's easier to understand what's going on.

changegroup: drop 'if True' that made the previous change clearer

changegroup: avoid iterating the whole manifest The old code gathered the list of all files that changed anywhere in history and then gathered changed file nodes by walking the entirety of each manifest to be sent in order to gather changed file nodes. That's going to be unfortunate for narrowhg, and it's already inefficient for medium-to-large repositories. Timings for bundle --all on my hg repo, tested with hgperf: Before: ! wall 23.442445 comb 23.440000 user 23.250000 sys 0.190000 (best of 3) After: ! wall 20.272187 comb 20.270000 user 20.190000 sys 0.080000 (best of 3)

posix: work around "posix" systems without os.link available (issue4974) Some platforms (see bug, notably a terminal emulator on Android) ship with os.link removed from Python to try and cater to other tools that expect os.link to exist iff hardlinks are supported on that platform. As a workaround for this madness, include a fallback path for when we're on a "posix" platform but lack os.link.

pathutil: use temporary variables instead of complicated wrapping The one-lining did not help readability, we get rid of it.