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[bootstrap] Give a better error when trying to run a path with no registered step

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Before:
```
thread 'main' panicked at 'error: no rules matched invalid', src/bootstrap/builder.rs:287:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

After:
```
error: no `check` rules matched 'invalid'
help: run `x.py check --help --verbose` to show a list of available paths
note: if you are adding a new Step to bootstrap itself, make sure you register it with `describe!`
```
This commit is contained in:
Joshua Nelson 2022-05-02 23:25:08 -05:00
parent c110cfa161
commit 3a800bf5c7
1 changed files with 13 additions and 1 deletions
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14
src/bootstrap/builder.rs
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@ -284,7 +284,19 @@ impl StepDescription {
}
if !attempted_run {
panic!("error: no rules matched {}", path.display());
eprintln!(
"error: no `{}` rules matched '{}'",
builder.kind.as_str(),
path.display()
);
eprintln!(
"help: run `x.py {} --help --verbose` to show a list of available paths",
builder.kind.as_str()
);
eprintln!(
"note: if you are adding a new Step to bootstrap itself, make sure you register it with `describe!`"
);
std::process::exit(1);
}
}
}