Breakup test.rs into more-manageable sub-modules

src/bootstrap/src/core/build_steps/test/book_tests.rs

@@ -0,0 +1,326 @@
+//! Collection of book-related tests.
+//!
+//! There are two general categories here:
+//! 1. Tests that try to run documentation tests (through `mdbook test` via `rustdoc`, or via
+//!    `rustdoc` on individual markdown files directly).
+//! 2. `src/tools/error_index_generator` is special in that its test step involves building a
+//!    suitably-staged sysroot (which matches what is ordinarily used to build `rustdoc`) to run
+//!    tests in the error index.
+
+use std::collections::HashSet;
+use std::ffi::{OsStr, OsString};
+use std::path::{Path, PathBuf};
+use std::{env, fs, iter};
+
+use crate::core::build_steps::compile::{self, run_cargo};
+use crate::core::build_steps::tool::{self, SourceType, Tool};
+use crate::core::build_steps::toolstate::ToolState;
+use crate::core::builder::{Builder, Compiler, Kind, RunConfig, ShouldRun, Step};
+use crate::utils::build_stamp::BuildStamp;
+use crate::utils::helpers;
+use crate::{Mode, t};
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+struct BookTest {
+    compiler: Compiler,
+    path: PathBuf,
+    name: &'static str,
+    is_ext_doc: bool,
+    dependencies: Vec<&'static str>,
+}
+
+impl Step for BookTest {
+    type Output = ();
+    const ONLY_HOSTS: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.never()
+    }
+
+    /// Runs the documentation tests for a book in `src/doc`.
+    ///
+    /// This uses the `rustdoc` that sits next to `compiler`.
+    fn run(self, builder: &Builder<'_>) {
+        // External docs are different from local because:
+        // - Some books need pre-processing by mdbook before being tested.
+        // - They need to save their state to toolstate.
+        // - They are only tested on the "checktools" builders.
+        //
+        // The local docs are tested by default, and we don't want to pay the cost of building
+        // mdbook, so they use `rustdoc --test` directly. Also, the unstable book is special because
+        // SUMMARY.md is generated, so it is easier to just run `rustdoc` on its files.
+        if self.is_ext_doc {
+            self.run_ext_doc(builder);
+        } else {
+            self.run_local_doc(builder);
+        }
+    }
+}
+
+impl BookTest {
+    /// This runs the equivalent of `mdbook test` (via the rustbook wrapper) which in turn runs
+    /// `rustdoc --test` on each file in the book.
+    fn run_ext_doc(self, builder: &Builder<'_>) {
+        let compiler = self.compiler;
+
+        builder.ensure(compile::Std::new(compiler, compiler.host));
+
+        // mdbook just executes a binary named "rustdoc", so we need to update PATH so that it
+        // points to our rustdoc.
+        let mut rustdoc_path = builder.rustdoc(compiler);
+        rustdoc_path.pop();
+        let old_path = env::var_os("PATH").unwrap_or_default();
+        let new_path = env::join_paths(iter::once(rustdoc_path).chain(env::split_paths(&old_path)))
+            .expect("could not add rustdoc to PATH");
+
+        let mut rustbook_cmd = builder.tool_cmd(Tool::Rustbook);
+        let path = builder.src.join(&self.path);
+        // Books often have feature-gated example text.
+        rustbook_cmd.env("RUSTC_BOOTSTRAP", "1");
+        rustbook_cmd.env("PATH", new_path).arg("test").arg(path);
+
+        // Books may also need to build dependencies. For example, `TheBook` has code samples which
+        // use the `trpl` crate. For the `rustdoc` invocation to find them them successfully, they
+        // need to be built first and their paths used to generate the
+        let libs = if !self.dependencies.is_empty() {
+            let mut lib_paths = vec![];
+            for dep in self.dependencies {
+                let mode = Mode::ToolRustc;
+                let target = builder.config.build;
+                let cargo = tool::prepare_tool_cargo(
+                    builder,
+                    compiler,
+                    mode,
+                    target,
+                    Kind::Build,
+                    dep,
+                    SourceType::Submodule,
+                    &[],
+                );
+
+                let stamp = BuildStamp::new(&builder.cargo_out(compiler, mode, target))
+                    .with_prefix(PathBuf::from(dep).file_name().and_then(|v| v.to_str()).unwrap());
+
+                let output_paths = run_cargo(builder, cargo, vec![], &stamp, vec![], false, false);
+                let directories = output_paths
+                    .into_iter()
+                    .filter_map(|p| p.parent().map(ToOwned::to_owned))
+                    .fold(HashSet::new(), |mut set, dir| {
+                        set.insert(dir);
+                        set
+                    });
+
+                lib_paths.extend(directories);
+            }
+            lib_paths
+        } else {
+            vec![]
+        };
+
+        if !libs.is_empty() {
+            let paths = libs
+                .into_iter()
+                .map(|path| path.into_os_string())
+                .collect::<Vec<OsString>>()
+                .join(OsStr::new(","));
+            rustbook_cmd.args([OsString::from("--library-path"), paths]);
+        }
+
+        builder.add_rust_test_threads(&mut rustbook_cmd);
+        let _guard = builder.msg(
+            Kind::Test,
+            compiler.stage,
+            format_args!("mdbook {}", self.path.display()),
+            compiler.host,
+            compiler.host,
+        );
+        let _time = helpers::timeit(builder);
+        let toolstate = if rustbook_cmd.delay_failure().run(builder) {
+            ToolState::TestPass
+        } else {
+            ToolState::TestFail
+        };
+        builder.save_toolstate(self.name, toolstate);
+    }
+
+    /// This runs `rustdoc --test` on all `.md` files in the path.
+    fn run_local_doc(self, builder: &Builder<'_>) {
+        let compiler = self.compiler;
+        let host = self.compiler.host;
+
+        builder.ensure(compile::Std::new(compiler, host));
+
+        let _guard =
+            builder.msg(Kind::Test, compiler.stage, format!("book {}", self.name), host, host);
+
+        // Do a breadth-first traversal of the `src/doc` directory and just run tests for all files
+        // that end in `*.md`
+        let mut stack = vec![builder.src.join(self.path)];
+        let _time = helpers::timeit(builder);
+        let mut files = Vec::new();
+        while let Some(p) = stack.pop() {
+            if p.is_dir() {
+                stack.extend(t!(p.read_dir()).map(|p| t!(p).path()));
+                continue;
+            }
+
+            if p.extension().and_then(|s| s.to_str()) != Some("md") {
+                continue;
+            }
+
+            files.push(p);
+        }
+
+        files.sort();
+
+        for file in files {
+            markdown_test(builder, compiler, &file);
+        }
+    }
+}
+
+macro_rules! test_book {
+    ($(
+        $name:ident, $path:expr, $book_name:expr,
+        default=$default:expr
+        $(,submodules = $submodules:expr)?
+        $(,dependencies=$dependencies:expr)?
+        ;
+    )+) => {
+        $(
+            #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+            pub struct $name {
+                compiler: Compiler,
+            }
+
+            impl Step for $name {
+                type Output = ();
+                const DEFAULT: bool = $default;
+                const ONLY_HOSTS: bool = true;
+
+                fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+                    run.path($path)
+                }
+
+                fn make_run(run: RunConfig<'_>) {
+                    run.builder.ensure($name {
+                        compiler: run.builder.compiler(run.builder.top_stage, run.target),
+                    });
+                }
+
+                fn run(self, builder: &Builder<'_>) {
+                    $(
+                        for submodule in $submodules {
+                            builder.require_submodule(submodule, None);
+                        }
+                    )*
+
+                    let dependencies = vec![];
+                    $(
+                        let mut dependencies = dependencies;
+                        for dep in $dependencies {
+                            dependencies.push(dep);
+                        }
+                    )?
+
+                    builder.ensure(BookTest {
+                        compiler: self.compiler,
+                        path: PathBuf::from($path),
+                        name: $book_name,
+                        is_ext_doc: !$default,
+                        dependencies,
+                    });
+                }
+            }
+        )+
+    }
+}
+
+test_book!(
+    Nomicon, "src/doc/nomicon", "nomicon", default=false, submodules=["src/doc/nomicon"];
+    Reference, "src/doc/reference", "reference", default=false, submodules=["src/doc/reference"];
+    RustdocBook, "src/doc/rustdoc", "rustdoc", default=true;
+    RustcBook, "src/doc/rustc", "rustc", default=true;
+    RustByExample, "src/doc/rust-by-example", "rust-by-example", default=false, submodules=["src/doc/rust-by-example"];
+    EmbeddedBook, "src/doc/embedded-book", "embedded-book", default=false, submodules=["src/doc/embedded-book"];
+    TheBook, "src/doc/book", "book", default=false, submodules=["src/doc/book"], dependencies=["src/doc/book/packages/trpl"];
+    UnstableBook, "src/doc/unstable-book", "unstable-book", default=true;
+    EditionGuide, "src/doc/edition-guide", "edition-guide", default=false, submodules=["src/doc/edition-guide"];
+);
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ErrorIndex {
+    compiler: Compiler,
+}
+
+impl Step for ErrorIndex {
+    type Output = ();
+    const DEFAULT: bool = true;
+    const ONLY_HOSTS: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        // Also add `error-index` here since that is what appears in the error message
+        // when this fails.
+        run.path("src/tools/error_index_generator").alias("error-index")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        // error_index_generator depends on librustdoc. Use the compiler that is normally used to
+        // build rustdoc for other tests (like compiletest tests in tests/rustdoc) so that it shares
+        // the same artifacts.
+        let compiler = run.builder.compiler(run.builder.top_stage, run.builder.config.build);
+        run.builder.ensure(ErrorIndex { compiler });
+    }
+
+    /// Runs the error index generator tool to execute the tests located in the error index.
+    ///
+    /// The `error_index_generator` tool lives in `src/tools` and is used to generate a markdown
+    /// file from the error indexes of the code base which is then passed to `rustdoc --test`.
+    fn run(self, builder: &Builder<'_>) {
+        let compiler = self.compiler;
+
+        let dir = builder.test_out(compiler.host);
+        t!(fs::create_dir_all(&dir));
+        let output = dir.join("error-index.md");
+
+        let mut tool = tool::ErrorIndex::command(builder);
+        tool.arg("markdown").arg(&output);
+
+        let guard =
+            builder.msg(Kind::Test, compiler.stage, "error-index", compiler.host, compiler.host);
+        let _time = helpers::timeit(builder);
+        tool.run_capture(builder);
+        drop(guard);
+        // The tests themselves need to link to std, so make sure it is available.
+        builder.ensure(compile::Std::new(compiler, compiler.host));
+        markdown_test(builder, compiler, &output);
+    }
+}
+
+fn markdown_test(builder: &Builder<'_>, compiler: Compiler, markdown: &Path) -> bool {
+    if let Ok(contents) = fs::read_to_string(markdown) {
+        if !contents.contains("```") {
+            return true;
+        }
+    }
+
+    builder.verbose(|| println!("doc tests for: {}", markdown.display()));
+    let mut cmd = builder.rustdoc_cmd(compiler);
+    builder.add_rust_test_threads(&mut cmd);
+    // allow for unstable options such as new editions
+    cmd.arg("-Z");
+    cmd.arg("unstable-options");
+    cmd.arg("--test");
+    cmd.arg(markdown);
+    cmd.env("RUSTC_BOOTSTRAP", "1");
+
+    let test_args = builder.config.test_args().join(" ");
+    cmd.arg("--test-args").arg(test_args);
+
+    cmd = cmd.delay_failure();
+    if !builder.config.verbose_tests {
+        cmd.run_capture(builder).is_success()
+    } else {
+        cmd.run(builder)
+    }
+}