Mercurial > hg
annotate rust/README.rst @ 49151:1b6e381521c5 stable
doc: use an absolute path in sys.path to work around a python DLL loading bug
This bug[1] was causing the zstd entry under "Available Compression Engines" to
be omitted from the documentation for some versions of python3. I could
upgrade, but past upgrades have broken venvs and clobbered installed packages.
It's a trivial workaround, so there's no sense in leaving this subtle issue. It
was flushed out by changing the module policy here from 'allow' to 'c', and
seeing this error:
ImportError: DLL load failed while importing parsers: The parameter is incorrect.
[1] https://github.com/python/cpython/issues/87271
Differential Revision: https://phab.mercurial-scm.org/D12599
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Mon, 02 May 2022 22:04:59 -0400 |
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1 =================== |
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2 Mercurial Rust Code |
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3 =================== |
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4 |
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5 This directory contains various Rust code for the Mercurial project. |
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6 Rust is not required to use (or build) Mercurial, but using it |
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7 improves performance in some areas. |
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8 |
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9 There are currently four independent Rust projects: |
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10 - chg. An implementation of chg, in Rust instead of C. |
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11 - hgcli. A project that provides a (mostly) self-contained "hg" binary, |
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12 for ease of deployment and a bit of speed, using PyOxidizer. See |
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13 hgcli/README.md. |
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14 - hg-core (and hg-cpython): implementation of some |
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15 functionality of mercurial in Rust, e.g. ancestry computations in |
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16 revision graphs, status or pull discovery. The top-level ``Cargo.toml`` file |
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17 defines a workspace containing these crates. |
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18 - rhg: a pure Rust implementation of Mercurial, with a fallback mechanism for |
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19 unsupported invocations. It reuses the logic `hg-core` but completely forgoes |
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20 interaction with Python. See `rust/rhg/README.md` for more details. |
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21 |
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22 Using Rust code |
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23 =============== |
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24 |
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25 Local use (you need to clean previous build artifacts if you have |
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26 built without rust previously):: |
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27 |
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28 $ make PURE=--rust local # to use ./hg |
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29 $ ./tests/run-tests.py --rust # to run all tests |
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30 $ ./hg debuginstall | grep -i rust # to validate rust is in use |
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31 checking Rust extensions (installed) |
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32 checking module policy (rust+c-allow) |
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33 |
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34 If the environment variable ``HGWITHRUSTEXT=cpython`` is set, the Rust |
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35 extension will be used by default unless ``--no-rust``. |
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36 |
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37 One day we may use this environment variable to switch to new experimental |
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38 binding crates like a hypothetical ``HGWITHRUSTEXT=hpy``. |
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39 |
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40 Special features |
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41 ================ |
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42 |
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43 You might want to check the `features` section in ``hg-cpython/Cargo.toml``. |
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44 It may contain features that might be interesting to try out. |
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45 |
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46 To use features from the Makefile, use the `HG_RUST_FEATURES` environment |
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47 variable: for instance `HG_RUST_FEATURES="some-feature other-feature"` |
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48 |
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49 Profiling |
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50 ========= |
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51 |
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52 Setting the environment variable ``RUST_LOG=trace`` will make hg print |
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53 a few high level rust-related performance numbers. It can also |
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54 indicate why the rust code cannot be used (say, using lookarounds in |
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55 hgignore). |
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56 |
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57 Creating a ``.cargo/config`` file with the following content enables |
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58 debug information in optimized builds. This make profiles more informative |
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59 with source file name and line number for Rust stack frames and |
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60 (in some cases) stack frames for Rust functions that have been inlined. |
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61 |
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62 [profile.release] |
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63 debug = true |
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64 |
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65 ``py-spy`` (https://github.com/benfred/py-spy) can be used to |
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66 construct a single profile with rust functions and python functions |
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67 (as opposed to ``hg --profile``, which attributes time spent in rust |
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68 to some unlucky python code running shortly after the rust code, and |
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69 as opposed to tools for native code like ``perf``, which attribute |
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70 time to the python interpreter instead of python functions). |
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71 |
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72 Example usage: |
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73 |
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74 $ make PURE=--rust local # Don't forget to recompile after a code change |
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75 $ py-spy record --native --output /tmp/profile.svg -- ./hg ... |
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76 |
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77 Developing Rust |
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78 =============== |
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79 |
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80 The current version of Rust in use is ``1.48.0``, because it's what Debian |
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81 stable has. You can use ``rustup override set 1.48.0`` at the root of the repo |
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82 to make it easier on you. |
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83 |
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84 Go to the ``hg-cpython`` folder:: |
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85 |
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86 $ cd rust/hg-cpython |
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87 |
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88 Or, only the ``hg-core`` folder. Be careful not to break compatibility:: |
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89 |
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90 $ cd rust/hg-core |
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92 Simply run:: |
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93 |
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94 $ cargo build --release |
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95 |
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96 It is possible to build without ``--release``, but it is not |
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97 recommended if performance is of any interest: there can be an order |
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98 of magnitude of degradation when removing ``--release``. |
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99 |
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100 For faster builds, you may want to skip code generation:: |
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101 |
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102 $ cargo check |
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103 |
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104 For even faster typing:: |
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105 |
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106 $ cargo c |
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107 |
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108 You can run only the rust-specific tests (as opposed to tests of |
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109 mercurial as a whole) with:: |
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110 |
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111 $ cargo test --all |
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112 |
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113 Formatting the code |
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114 ------------------- |
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115 |
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116 We use ``rustfmt`` to keep the code formatted at all times. For now, we are |
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117 using the nightly version because it has been stable enough and provides |
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118 comment folding. |
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119 |
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120 To format the entire Rust workspace:: |
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121 |
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122 $ cargo +nightly fmt |
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123 |
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124 This requires you to have the nightly toolchain installed. |