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annotate mercurial/helptext/rust.txt @ 48827:1371c18e467d

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setup: remove printf trampoline Differential Revision: https://phab.mercurial-scm.org/D12271
author Augie Fackler <augie@google.com>
date Wed, 02 Mar 2022 10:07:49 -0500
parents f7086f6173f8
children 363b687bb794
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 Mercurial can be augmented with Rust extensions for speeding up certain
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2 operations.
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3
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4 Compatibility
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5 =============
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6
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7 Though the Rust extensions are only tested by the project under Linux, users of
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8 MacOS, FreeBSD and other UNIX-likes have been using the Rust extensions. Your
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9 mileage may vary, but by all means do give us feedback or signal your interest
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10 for better support.
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11
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12 No Rust extensions are available for Windows at this time.
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13
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14 Features
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15 ========
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16
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17 The following operations are sped up when using Rust:
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18
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19 - discovery of differences between repositories (pull/push)
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20 - nodemap (see :hg:`help config.format.use-persistent-nodemap`)
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21 - all commands using the dirstate (status, commit, diff, add, update, etc.)
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22 - dirstate-v2 (see :hg:`help config.format.use-dirstate-v2`)
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23 - iteration over ancestors in a graph
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24
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25 More features are in the works, and improvements on the above listed are still
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26 in progress. For more experimental work see the "rhg" section.
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27
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28 Checking for Rust
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29 =================
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30
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31 You may already have the Rust extensions depending on how you install Mercurial.
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32
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33 $ hg debuginstall | grep -i rust
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34 checking Rust extensions (installed)
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35 checking module policy (rust+c-allow)
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36
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37 If those lines don't even exist, you're using an old version of `hg` which does
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38 not have any Rust extensions yet.
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39
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40 Installing
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41 ==========
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42
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43 You will need `cargo` to be in your `$PATH`. See the "MSRV" section for which
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44 version to use.
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45
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46 Using pip
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47 ---------
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48
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49 Users of `pip` can install the Rust extensions with the following command:
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50
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51 $ pip install mercurial --global-option --rust --no-use-pep517
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52
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53 `--no-use-pep517` is here to tell `pip` to preserve backwards compatibility with
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54 the legacy `setup.py` system. Mercurial has not yet migrated its complex setup
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55 to the new system, so we still need this to add compiled extensions.
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56
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57 This might take a couple of minutes because you're compiling everything.
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58
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59 See the "Checking for Rust" section to see if the install succeeded.
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60
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61 From your distribution
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62 ----------------------
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63
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64 Some distributions are shipping Mercurial with Rust extensions enabled and
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65 pre-compiled (meaning you won't have to install `cargo`), or allow you to
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66 specify an install flag. Check with your specific distribution for how to do
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67 that, or ask their team to add support for hg+Rust!
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68
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69 From source
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70 -----------
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71
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72 Please refer to the `rust/README.rst` file in the Mercurial repository for
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73 instructions on how to install from source.
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74
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75 MSRV
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76 ====
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77
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78 The minimum supported Rust version is currently 1.48.0. The project's policy is
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79 to follow the version from Debian stable, to make the distributions' job easier.
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80
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81 rhg
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82 ===
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83
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84 There exists an experimental pure-Rust version of Mercurial called `rhg` with a
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85 fallback mechanism for unsupported invocations. It allows for much faster
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86 execution of certain commands while adding no discernable overhead for the rest.
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87
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88 The only way of trying it out is by building it from source. Please refer to
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89 `rust/README.rst` in the Mercurial repository.
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90
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91 Contributing
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92 ============
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93
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94 If you would like to help the Rust endeavor, please refer to `rust/README.rst`
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95 in the Mercurial repository.