bootstrap/core/
metadata.rs

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1use std::collections::BTreeMap;
2use std::path::PathBuf;
3
4use serde_derive::Deserialize;
5
6use crate::utils::exec::command;
7use crate::{Build, Crate, t};
8
9/// For more information, see the output of
10/// <https://doc.rust-lang.org/nightly/cargo/commands/cargo-metadata.html>
11#[derive(Debug, Deserialize)]
12struct Output {
13    packages: Vec<Package>,
14}
15
16/// For more information, see the output of
17/// <https://doc.rust-lang.org/nightly/cargo/commands/cargo-metadata.html>
18#[derive(Debug, Deserialize)]
19struct Package {
20    name: String,
21    source: Option<String>,
22    manifest_path: String,
23    dependencies: Vec<Dependency>,
24    targets: Vec<Target>,
25    features: BTreeMap<String, Vec<String>>,
26}
27
28/// For more information, see the output of
29/// <https://doc.rust-lang.org/nightly/cargo/commands/cargo-metadata.html>
30#[derive(Debug, Deserialize)]
31struct Dependency {
32    name: String,
33    source: Option<String>,
34}
35
36#[derive(Debug, Deserialize)]
37struct Target {
38    kind: Vec<String>,
39}
40
41/// Collects and stores package metadata of each workspace members into `build`,
42/// by executing `cargo metadata` commands.
43pub fn build(build: &mut Build) {
44    for package in workspace_members(build) {
45        if package.source.is_none() {
46            let name = package.name;
47            let mut path = PathBuf::from(package.manifest_path);
48            path.pop();
49            let deps = package
50                .dependencies
51                .into_iter()
52                .filter(|dep| dep.source.is_none())
53                .map(|dep| dep.name)
54                .collect();
55            let has_lib = package.targets.iter().any(|t| t.kind.iter().any(|k| k == "lib"));
56            let krate = Crate {
57                name: name.clone(),
58                deps,
59                path,
60                has_lib,
61                features: package.features.keys().cloned().collect(),
62            };
63            let relative_path = krate.local_path(build);
64            build.crates.insert(name.clone(), krate);
65            let existing_path = build.crate_paths.insert(relative_path, name);
66            assert!(
67                existing_path.is_none(),
68                "multiple crates with the same path: {}",
69                existing_path.unwrap()
70            );
71        }
72    }
73}
74
75/// Invokes `cargo metadata` to get package metadata of each workspace member.
76///
77/// This is used to resolve specific crate paths in `fn should_run` to compile
78/// particular crate (e.g., `x build sysroot` to build library/sysroot).
79fn workspace_members(build: &Build) -> Vec<Package> {
80    let collect_metadata = |manifest_path| {
81        let mut cargo = command(&build.initial_cargo);
82        cargo
83            // Will read the libstd Cargo.toml
84            // which uses the unstable `public-dependency` feature.
85            .env("RUSTC_BOOTSTRAP", "1")
86            .arg("metadata")
87            .arg("--format-version")
88            .arg("1")
89            .arg("--no-deps")
90            .arg("--manifest-path")
91            .arg(build.src.join(manifest_path));
92        let metadata_output = cargo.run_always().run_capture_stdout(build).stdout();
93        let Output { packages, .. } = t!(serde_json::from_str(&metadata_output));
94        packages
95    };
96
97    // Collects `metadata.packages` from the root and library workspaces.
98    let mut packages = vec![];
99    packages.extend(collect_metadata("Cargo.toml"));
100    packages.extend(collect_metadata("library/Cargo.toml"));
101    packages
102}
bootstrap/core/metadata.rs

bootstrap/core/
metadata.rs
