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push: rework the computation of fallbackheads to be correct...
push: rework the computation of fallbackheads to be correct The previous computation tried to be smart but ended up being wrong. This was caught by phase movement test while reworking the phase discovery logic to be faster. The previous logic was failing to catch case where the pushed set was not based on a common heads (i.e. when the discovery seemed to have "over discovered" content, outside the pushed set) In the following graph, `e` is a common head and we `hg push -r f`. We need to detect `c` as a fallback heads and we previous failed to do so:: e | d f |/ c | b | a The performance impact of the change seems minimal. On the most impacted repository at hand (mozilla-try), the slowdown seems mostly mixed in the overall noise `hg push` but seems to be in the hundred of milliseconds order of magnitude. When using rust, we seems to be a bit faster, probably because we leverage more accelaratd internals. I added a couple of performance related common for further investigation later on.
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Oxidized Mercurial

This project provides a Rust implementation of the Mercurial (hg)
version control tool.

Under the hood, the project uses
PyOxidizer to embed a Python
interpreter in a binary built with Rust. At run-time, the Rust fn main()
is called and Rust code handles initial process startup. An in-process
Python interpreter is started (if needed) to provide additional
functionality.

Building

First, acquire and build a copy of PyOxidizer; you probably want to do this in
some directory outside of your clone of Mercurial:

$ git clone https://github.com/indygreg/PyOxidizer.git
$ cd PyOxidizer
$ cargo build --release

Then build this Rust project using the built pyoxidizer executable:

$ /path/to/pyoxidizer/target/release/pyoxidizer build --release

If all goes according to plan, there should be an assembled application
under build/<arch>/release/app/ with an hg executable:

$ build/x86_64-unknown-linux-gnu/release/app/hg version
Mercurial Distributed SCM (version 5.3.1+433-f99cd77d53dc+20200331)
(see https://mercurial-scm.org for more information)

Copyright (C) 2005-2020 Olivia Mackall and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Running Tests

To run tests with a built hg executable, you can use the --with-hg
argument to run-tests.py. But there's a wrinkle: many tests run custom
Python scripts that need to import modules provided by Mercurial. Since
these modules are embedded in the produced hg executable, a regular
Python interpreter can't access them! To work around this, set PYTHONPATH
to the Mercurial source directory. e.g.:

$ cd /path/to/hg/src/tests
$ PYTHONPATH=`pwd`/.. python3.9 run-tests.py \
    --with-hg `pwd`/../rust/hgcli/build/x86_64-unknown-linux-gnu/release/app/hg