Trait RegistryQuery 

pub trait RegistryQuery {
    // Required method
    fn published_versions(
        &self,
        ecosystem: &str,
        package: &str,
    ) -> Result<Vec<String>>;

    // Provided method
    fn published_checksum(
        &self,
        ecosystem: &str,
        package: &str,
        version: &str,
    ) -> Result<String> { ... }
}

Queries a package registry for already-published state — the “remote is ground truth” source the release reconciler consults (ADR-0003).

Required Methods

fn published_versions( &self, ecosystem: &str, package: &str, ) -> Result<Vec<String>>

Versions of package already published to ecosystem’s registry.

Provided Methods

fn published_checksum( &self, ecosystem: &str, package: &str, version: &str, ) -> Result<String>

The registry-recorded content digest of package@version — for crates.io the sparse-index cksum, the lowercase-hex SHA-256 of the published .crate tarball.

Used to authenticate an idempotency skip: a resumed publish that finds the version already on the registry trusts that “already published” answer only when this digest matches the digest of the artifact the cut would upload, so the registry’s crate is proven byte-identical to the intended one before the publish is skipped (see crate::release::adapters::cargo). Name + version existence alone is not enough — a different artifact could occupy the version.

Fail-closed, like Self::published_versions. Ok(<hex>) is the recorded digest; an outage, a version that is not on the index, or a registry that exposes no digest for the version is an Err — never a fabricated value that could mask a mismatch as a match. The default implementation errors (io::ErrorKind::Unsupported): a backend wires this only for the ecosystems whose skip path is digest-authenticated (crates.io today), and the sole caller is the cargo adapter’s resume skip.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors