Add a timeout to the `remote-test-client` connection #147952

pvdrz · 2025-10-21T23:10:58Z

Currently, the remote-test-client doesn't have a timeout when connecting to the remote-test-server. This means that running tests using it can hang indefinitely which causes issues when running tests on CI, for example.

This PR now sets a default timeout of 5 minutes, meaning that if, for example, TEST_DEVICE_ADDR=<IP:PORT> ./x test --target riscv64gc-unknown-linux-gnu tests/ui is run and the remote-test-server is not reachable by the client, the client will panic after the timeout is reached.

Additionally, the TEST_DEVICE_CONNECT_TIMEOUT env variable can be used to set up the timeout to any value (in seconds).

This PR also wires up a test step for remote-test-client, which didn't previously have tool tests run in CI.

rustbot · 2025-10-21T23:11:03Z

r? @Mark-Simulacrum

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src/tools/remote-test-client/src/main.rs

jyn514

LGTM but I no longer have r+ permissions

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src/tools/remote-test-client/src/main.rs

Enselic · 2025-10-25T12:51:30Z

src/tools/remote-test-client/src/main.rs

+        total_dur += dur;
    }
+
+    panic!("Test device at {device_address} timed out");


It would be comforting with a test for this. I'm thinking a test where we make the binary connect to non-existing address and use a small timeout and assert on that it panics.

src/tools/remote-test-client/src/main.rs

Enselic · 2025-10-29T05:00:42Z

I'll assign myself to this one for now.

r? Enselic

Enselic

Found some more things. To avoid confusion for the test later: I would prefer a test that actually invokes the binary rather than having some kind of unit test.

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src/tools/remote-test-client/src/main.rs

Enselic · 2025-10-31T18:46:49Z

I'm currently happy with the way the code looks. So just a test left as far as I'm concerned.

pvdrz · 2025-11-04T15:38:55Z

@Enselic Do you want me to factor out the main function so I can write a unit test for it or do you want me to write a test that actually runs the binary? If you want the latter, I don't know how to do it so I'd need some instructions.

Enselic · 2025-11-05T04:47:29Z

A test that actually runs the binary. I can see that we've had assert_cmd in our Cargo.lock before (added with #125408), so let's see how it feels to use assert_cmd to test the remote-test-client binary. Let's use the same structure as src/tools/jsondoclint/src/validator/tests.rs and put tests.rs under src. I think that helps with build dependency resolution and minimize rebuilds.

Another thing: We need to document the new environment variable in src/doc/rustc-dev-guide/src/tests/running.md.

rustbot · 2025-11-06T05:36:46Z

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

rustbot · 2025-11-06T05:41:06Z

The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.

cc @BoxyUwU, @jieyouxu, @Kobzol, @tshepang

Enselic · 2025-11-08T15:52:27Z

Can you split out the support for testing of remote-test-client in its own PR please? It will probably require some iteration as well. Then once that lands we can rebase this PR on top.

@rustbot author

rustbot · 2025-11-08T15:53:21Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

jyn514 · 2025-11-10T15:48:23Z

@Enselic is it necessary to land it as a separate PR? it seems quite tied to the changes in this one, it would suck to land a separate PR only to find out that the tests here needed further changes to the test infrastructure.

in general I feel like this PR is being held to a higher standard than most changes to remote-test-client. my understanding is that it didn't have a test suite at all before this change? it seems like a strict improvement to have an ok test suite and a ok tests rather than no tests at all.

Enselic · 2025-11-10T21:01:45Z

Well, reviewer guidelines say that stuff should be tested. And that PRs should be as small as possible. That is also an approach I personally think is preferred. So for me it seems natural to split.

But I am completely fine with others doing r+ on this if they are happy with the PR.

jieyouxu

I'm fine with landing these together given it's not too large.

View changes since this review

jieyouxu · 2025-11-11T00:49:41Z

Well, reviewer guidelines say that stuff should be tested. And that PRs should be as small as possible. That is also an approach I personally think is preferred.

It's a judgement call, would definitely also ask for a split if the test infra changes were larger.

jieyouxu · 2025-11-11T00:50:31Z

I edited the PR description to reflect that this PR is also registering a test step for remote-test-client.

@bors r=Enselic,jieyouxu rollup

bors · 2025-11-11T00:50:34Z

📌 Commit bd14144 has been approved by Enselic,jieyouxu

It is now in the queue for this repository.

…-timeout, r=Enselic,jieyouxu Add a timeout to the `remote-test-client` connection Currently, the `remote-test-client` doesn't have a timeout when connecting to the `remote-test-server`. This means that running tests using it can hang indefinitely which causes issues when running tests on CI, for example. This PR now sets a default timeout of 5 minutes, meaning that if, for example, `TEST_DEVICE_ADDR=<IP:PORT> ./x test --target riscv64gc-unknown-linux-gnu tests/ui` is run and the `remote-test-server` is not reachable by the client, the client will panic after the timeout is reached. Additionally, the `TEST_DEVICE_CONNECT_TIMEOUT` env variable can be used to set up the timeout to any value (in seconds). This PR also wires up a test step for `remote-test-client`, which didn't previously have tool tests run in CI.

Rollup of 16 pull requests Successful merges: - #141470 (Add new `function_casts_as_integer` lint) - #143619 (`c_variadic`: Add future-incompatibility warning for `...` arguments without a pattern outside of `extern` blocks) - #146495 (rustdoc: Erase `#![doc(document_private_items)]`) - #147771 (Rename `*exact_{div,shr,shl}` to `*{div,shr,shl}_exact`) - #147833 (rustdoc-json: move `target` to `json::conversions`) - #147952 (Add a timeout to the `remote-test-client` connection) - #147955 (compiletest: Migrate `TestProps` directive handling to a system of named handlers) - #148480 (Add `Steal::risky_hack_borrow_mut`) - #148506 (Special case detecting `'static` lifetime requirement coming from `-> Box<dyn Trait>`) - #148508 (Provide more context when mutably borrowing an imutably borrowed value) - #148530 (update the bootstrap readme) - #148608 (Add test for --test-builder success path) - #148636 (bootstrap: respect `build.python` on macOS) - #148639 (test(rustdoc): move tests into jump-to-def) - #148647 (Check unsafety for non-macro attributes in `validate_attr`) - #148667 (a few small clippy fixes) r? `@ghost` `@rustbot` modify labels: rollup

Enselic · 2025-11-11T08:37:57Z

Since I was partly put as r on this I'd like to get rid of the two "Adress review comments" commits before merge (and it's not just me: that is also part of reviewer guidelines). This PR should be at most 2 commits. One to add test support and one to add the feature. I'm also fine with just one commit.

@bors r-

Rollup of 16 pull requests Successful merges: - #141470 (Add new `function_casts_as_integer` lint) - #143619 (`c_variadic`: Add future-incompatibility warning for `...` arguments without a pattern outside of `extern` blocks) - #146495 (rustdoc: Erase `#![doc(document_private_items)]`) - #147771 (Rename `*exact_{div,shr,shl}` to `*{div,shr,shl}_exact`) - #147833 (rustdoc-json: move `target` to `json::conversions`) - #147952 (Add a timeout to the `remote-test-client` connection) - #147955 (compiletest: Migrate `TestProps` directive handling to a system of named handlers) - #148480 (Add `Steal::risky_hack_borrow_mut`) - #148506 (Special case detecting `'static` lifetime requirement coming from `-> Box<dyn Trait>`) - #148508 (Provide more context when mutably borrowing an imutably borrowed value) - #148530 (update the bootstrap readme) - #148608 (Add test for --test-builder success path) - #148636 (bootstrap: respect `build.python` on macOS) - #148639 (test(rustdoc): move tests into jump-to-def) - #148647 (Check unsafety for non-macro attributes in `validate_attr`) - #148667 (a few small clippy fixes) r? `@ghost` `@rustbot` modify labels: rollup

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Rollup of 17 pull requests #148810

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pvdrz added 2 commits November 11, 2025 12:15

Add a timeout to the remote-test-client connection

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Document the new env variable in the rustc-dev-guide

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pvdrz force-pushed the pvdrz/remote-test-client-timeout branch from bd14144 to 08d3225 Compare November 11, 2025 17:15

pvdrz requested a review from jieyouxu November 12, 2025 16:30

Add a timeout to the remote-test-client connection #147952

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Add a timeout to the `remote-test-client` connection #147952

Add a timeout to the `remote-test-client` connection #147952

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