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

rebase: inline simple function for finding obsolete subset of commits `_filterobsoleterevs()` is just one line long. It was introduced in 2d294dada4f8 (rebase: small refactoring to allow better extensibility from extensions, 2016-01-14), for use by the "inhibit" extension. That extension was removed from the evolve repo in 87e87881059d (compat: drop the inhibit hacky extension, 2017-10-24). Differential Revision: https://phab.mercurial-scm.org/D10198

ci: hook network-io tests into the pipeline This runs the "pip install" tests once for Python 2 and 3 each. Differential Revision: https://phab.mercurial-scm.org/D10075

merge: with stable

test: update expected output in test-http.t The output was introduced in a4c19a162615 and is wrong and unstable. So we glob it as other part of these tests already do. Differential Revision: https://phab.mercurial-scm.org/D10153

remotefilelog: remove unused import This is no longer used since a4c19a162615. Differential Revision: https://phab.mercurial-scm.org/D10152

wireprotov1peer: don't raise internal errors in some cases Specifically, when the peer is closed in the middle of a batch of rpcs. Differential Revision: https://phab.mercurial-scm.org/D10074

sshpeer: don't fail forwarding output from closed connections The test still shows an internal error, but one that happens further along. Differential Revision: https://phab.mercurial-scm.org/D10073

test: show internal exception with batchable rpcs over ssh Differential Revision: https://phab.mercurial-scm.org/D10072

rhg: Ignore trailing newlines in .hg/sharedpath Differential Revision: https://phab.mercurial-scm.org/D10132

tests: Add `--rhg` and `--with-rhg=<path>` options for `run-tests.py` They are mostly equivalent to the corresponding `chg` options. For now, many tests are still failing in this configuration. It is *not* run on CI. Differential Revision: https://phab.mercurial-scm.org/D10095

rhg: Add support for automatic fallback to Python `rhg` is a command-line application that can do a small subset of what `hg` can. It is written entirely in Rust, which avoids the cost of starting a Python interpreter and importing many Python modules. In a script that runs many `hg` commands, this cost can add up. However making users decide when to use `rhg` instead of `hg` is not practical as we want the subset of supported functionality to grow over time. Instead we introduce "fallback" behavior where, when `rhg` encounters something (a sub-command, a repository format, …) that is not implemented in Rust-only, it does nothing but silently start a subprocess of Python-based `hg` running the same command. That way `rhg` becomes a drop-in replacement for `hg` that sometimes goes faster. Whether Python is used should be an implementation detail not apparent to users (other than through speed). A new `fallback` value is added to the previously introduced `rhg.on-unsupported` configuration key. When in this mode, the new `rhg.fallback-executable` config is determine what command to use to run a Python-based `hg`. The previous `rhg.on-unsupported = abort-silent` configuration was designed to let a wrapper script call `rhg` and then fall back to `hg` based on the exit code. This is still available, but having fallback behavior built-in in rhg might be easier for users instead of leaving that script "as an exercise for the reader". Using a subprocess like this is not idea, especially when `rhg` is to be installed in `$PATH` as `hg`, since the other `hg.py` executable needs to still be available… somewhere. Eventually this could be replaced by using PyOxidizer to a have a single executable that embeds a Python interpreter, but only starts it when needed. Differential Revision: https://phab.mercurial-scm.org/D10093

rhg: Add a `rhg.on-unsupported` configuration key For now the two values are: * `abort-silent`: silently exit with code 252, the previous default behavior * `abort`: print an error message about what feature is not supported, then exit with code 252. Now the default. Differential Revision: https://phab.mercurial-scm.org/D10091

rhg: Make configuration available as early as possible in main() Differential Revision: https://phab.mercurial-scm.org/D10090

rust: Upgrade Cargo.lock to the newer format As discussed in https://phab.mercurial-scm.org/D10085#153099 See https://github.com/rust-lang/cargo/pull/7070 and https://blog.rust-lang.org/2020/01/30/Rust-1.41.0.html#less-conflict-prone-cargolock-format Differential Revision: https://phab.mercurial-scm.org/D10089

sshpeer: enable+fix warning about sshpeers not being closed explicitly I recommend looking at this with a diff that ignores indentation. The test changes are because localrepo.close() updates some cache, which appears happens earlier now on rollbacks or strips or something. The http changes are because httppeer.close() prints stats with --verbose. Differential Revision: https://phab.mercurial-scm.org/D9999

sshpeer: add a develwarning if an sshpeer is not closed explicitly The warning is disabled until the next commit, because fixing it results in a noisy diff due to indentation changes. Differential Revision: https://phab.mercurial-scm.org/D9998

remotefilelog: rework workaround for sshpeer deadlocks The wrapping of `sshpeer.cleanup` silently broke when `cleanup` was renamed to `_cleanup`, a couple of years ago. I don't know what `orig.im_self` is, but regardless, the intention of the wrapping seems pretty clear: close stderr before sshpeer._cleanuppipes blocks on it. So do that. Differential Revision: https://phab.mercurial-scm.org/D9997

sshpeer: add a method to check if a doublepipe is closed So we can tell in a next commit if we're trying to close an already closed connection or not (in which case, we may warn). Differential Revision: https://phab.mercurial-scm.org/D9996

sshpeer: make sshpeer.close() close the underlying connection So the connection can be closed eagerly in future commits, instead of relying on __del__. Differential Revision: https://phab.mercurial-scm.org/D9995

copies-rust: add a macro-based unit-testing framework `compare_values`, `merge_copies_dict`, and `CombineChangesetCopies` are APIs whose signatures involve non-trivial types. Calling them directly in unit tests would involve a lot of verbose setup code that obscures the meaningful parts of a given test case. This adds a macro-based test-harness with pseudo-syntax to tersely create arguments and expected return values in the correct types. For now there is only one (not particularly meaningful) test case per tested function, just to exercize the macros. Differential Revision: https://phab.mercurial-scm.org/D10071