Method manifest_fetch_error

atomic-cli/src/commands/clone/command.rs:332–343

Convert a manifest-fetch failure into a CLI error. A protocol error means the server predates `?view-manifest` support. That is fatal: without manifests a clone cannot preserve view identity (scope and parent), so there is no fallback to the old flat changelist path.

(&self, err: RemoteError)

    /// identity (scope and parent), so there is no fallback to the old flat
    /// changelist path.
    fn manifest_fetch_error(&self, err: RemoteError) -> CliError {
        if matches!(err, RemoteError::ProtocolError { .. }) {
            CliError::RemoteError {
                message: "This server is too old for identity-preserving clone: it does not \
                          support view manifests (?view-manifest). Upgrade the server."
                    .to_string(),
                url: Some(self.url.clone()),
            }
        } else {
            convert_remote_error(err, &self.url)
        }
    }

    /// Fetch and validate one view's manifest from the remote.
    ///