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Fix running bootstrap tests on a fresh clone
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In #96303, I changed the tests not to manage submodules, with the main
goal of avoiding a clone for llvm-project. Unfortunately, there are some tests
which depend on submodules - I didn't notice locally because they were already checked out for me,
and CI doesn't use submodule handling at all. Fresh clones, however, were impacted:
```
failures:

---- builder::tests::defaults::doc_default stdout ----
thread 'main' panicked at 'fs::read_dir(builder.src.join(&relative_path).join("redirects")) failed with No such file or directory (os error 2)', src/bootstrap/doc.rs:232:21
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

---- builder::tests::dist::dist_only_cross_host stdout ----
thread 'main' panicked at 'fs::read_to_string(&toml_file_name) failed with No such file or directory (os error 2)', src/bootstrap/lib.rs:1314:20
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

Try and get the best of both worlds by only checking out the submodules actually used in tests.
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jyn514 committed Apr 25, 2022
1 parent 18f314e commit 0079aad
Showing 1 changed file with 9 additions and 0 deletions.
9 changes: 9 additions & 0 deletions src/bootstrap/builder/tests.rs
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,16 @@ fn configure(cmd: &str, host: &[&str], target: &[&str]) -> Config {
// don't save toolstates
config.save_toolstates = None;
config.dry_run = true;

// Ignore most submodules, since we don't need them for a dry run.
// But make sure to check out the `doc` and `rust-analyzer` submodules, since some steps need them
// just to know which commands to run.
let submodule_build = Build::new(Config::parse(&["check".to_owned()]));
let submodule_builder = Builder::new(&submodule_build);
submodule_builder.update_submodule(Path::new("src/doc/book"));
submodule_builder.update_submodule(Path::new("src/tools/rust-analyzer"));
config.submodules = Some(false);

config.ninja_in_file = false;
// try to avoid spurious failures in dist where we create/delete each others file
// HACK: rather than pull in `tempdir`, use the one that cargo has conveniently created for us
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