262 lines
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<main>
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<h1 id="crater"><a class="header" href="#crater">Crater</a></h1>
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<p><a href="https://github.com/rust-lang/crater">Crater</a> is a tool for compiling and
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running tests for <em>every</em> crate on <a href="https://crates.io">crates.io</a> (and a few on
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GitHub). It is mainly used for checking the extent of breakage when implementing
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potentially breaking changes and ensuring lack of breakage by running beta vs
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stable compiler versions.</p>
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<h2 id="when-to-run-crater"><a class="header" href="#when-to-run-crater">When to run Crater</a></h2>
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<p>You should request a crater run if your PR makes large changes to the compiler
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or could cause breakage. If you are unsure, feel free to ask your PR's reviewer.</p>
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<h2 id="requesting-crater-runs"><a class="header" href="#requesting-crater-runs">Requesting Crater Runs</a></h2>
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<p>The rust team maintains a few machines that can be used for running crater runs
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on the changes introduced by a PR. If your PR needs a crater run, leave a
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comment for the triage team in the PR thread. Please inform the team whether you
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require a "check-only" crater run, a "build only" crater run, or a
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"build-and-test" crater run. The difference is primarily in time; the
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conservative (if you're not sure) option is to go for the build-and-test run. If
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making changes that will only have an effect at compile-time (e.g., implementing
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a new trait) then you only need a check run.</p>
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<p>Your PR will be enqueued by the triage team and the results will be posted when
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they are ready. Check runs will take around ~3-4 days, with the other two taking
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5-6 days on average.</p>
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<p>While crater is really useful, it is also important to be aware of a few
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caveats:</p>
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<ul>
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<li>
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<p>Not all code is on crates.io! There is a lot of code in repos on GitHub and
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elsewhere. Also, companies may not wish to publish their code. Thus, a
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successful crater run is not a magically green light that there will be no
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breakage; you still need to be careful.</p>
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</li>
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<li>
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<p>Crater only runs Linux builds on x86_64. Thus, other architectures and
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platforms are not tested. Critically, this includes Windows.</p>
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</li>
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<li>
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<p>Many crates are not tested. This could be for a lot of reasons, including that
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the crate doesn't compile any more (e.g. used old nightly features), has
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broken or flaky tests, requires network access, or other reasons.</p>
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</li>
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<li>
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<p>Before crater can be run, <code>@bors try</code> needs to succeed in building artifacts.
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This means that if your code doesn't compile, you cannot run crater.</p>
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</li>
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</ul>
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