rust-lang/rust · error · anyhow::Error

missing component from manifest: {}

Error message

missing component from manifest: {}

What it means

Thrown by collect_checksums in bump-stage0 when a required component name (from COMPILER_COMPONENTS or RUSTFMT_COMPONENTS) is absent from the fetched channel manifest's pkg map. Each component (rustc, rust-std, cargo, clippy-preview, rustfmt-preview) is expected to have an entry whose checksums are recorded into stage0.

Source

Thrown at src/tools/bump-stage0/src/main.rs:189

        Ok(Some(VersionMetadata {
            channel_manifest_hash: manifest_hash,
            git_commit_hash: manifest.pkg["rust"]
                .git_commit_hash
                .as_ref()
                .expect("invalid git_commit_hash")
                .into(),
            date: manifest.date,
            version: "nightly".into(),
        }))
    }

    fn collect_checksums(&mut self, manifest: &Manifest, components: &[&str]) -> Result<(), Error> {
        let prefix = format!("{}/", self.config.dist_server);
        for component in components {
            let pkg = manifest
                .pkg
                .get(*component)
                .ok_or_else(|| anyhow::anyhow!("missing component from manifest: {}", component))?;
            for target in pkg.target.values() {
                for pair in &[(&target.url, &target.hash), (&target.xz_url, &target.xz_hash)] {
                    if let (Some(url), Some(sha256)) = pair {
                        let url = url
                            .strip_prefix(&prefix)
                            .ok_or_else(|| {
                                anyhow::anyhow!("url doesn't start with dist server base: {}", url)
                            })?
                            .to_string();
                        self.checksums.insert(url, sha256.clone());
                    }
                }
            }
        }
        for artifact in manifest.artifacts.values() {
            for targets in artifact.target.values() {
                for target in targets {
                    let url = target

View on GitHub (pinned to 7088e4b63a)

Solutions

1. Open the channel manifest URL (printed/logged by fetch_manifest) and check which component names it actually contains.
2. If a component was renamed upstream, update the COMPILER_COMPONENTS or RUSTFMT_COMPONENTS constant to the new name.
3. If the component genuinely should be optional for this channel, gate its inclusion behind a channel check (as detect_rustfmt already does for rustfmt).
4. Verify the date passed to fetch_manifest is correct and the manifest is not for a different channel.

Example fix

// before
const COMPILER_COMPONENTS: &[&str] = &["rustc", "rust-std", "cargo", "clippy-preview", "rustfmt-preview"];
// error: missing component from manifest: rustfmt-preview (on beta/stable)

// after (rustfmt is nightly-only; do not request it unconditionally)
const COMPILER_COMPONENTS: &[&str] = &["rustc", "rust-std", "cargo", "clippy-preview"];

// Before collect_checksums, verify each requested component exists in the manifest.
for component in components {
    if !manifest.pkg.contains_key(*component) {
        eprintln!("Manifest for channel/date lacks component '{component}'; skipping or aborting");
    }
}

if let Err(e) = tool.collect_checksums(&manifest, components) {
    if e.to_string().starts_with("missing component from manifest") {
        eprintln!("{e:#}. Check the channel manifest contents and the component list.");
    }
    return Err(e);
}

When it happens

Trigger: The upstream channel manifest for the target date/channel omits a component that bump-stage0 still requests; the component was renamed in the manifest but not in the COMPILER_COMPONENTS/RUSTFMT_COMPONENTS constants; a stale/old date manifest predates a component.

Common situations: Running bump-stage0 against a nightly date before rustfmt-preview existed; a component renamed in the dist manifest; manifest fetch returned a partial/wrong-channel document.

Related errors

• unsupported channel: {}
• url doesn't start with dist server base: {}
• failed to parse version
• rust-analyzer Language Server is not available. Please, ensu
• Failed to execute ${path} --version.

AI-assisted analysis of rust-lang/rust@7088e4b63a (2026-08-10). Data as JSON: /api/errors/59e76ba355c4663e. Report an issue: GitHub.