gitlabhq/gitlabhq · error · RemoteMirrors::HostKeysConverter::InvalidHostKeyError

cannot determine hostname from URL for bare key

Error message

cannot determine hostname from URL for bare key

What it means

Error "cannot determine hostname from URL for bare key" thrown in gitlabhq/gitlabhq.

Source

Thrown at app/models/remote_mirrors/host_keys_converter.rb:102

    def sanitize_key(key)
      parts = Gitlab::SSHPublicKey.extract_key_parts(key)
      return key unless parts

      [parts[:prefix].presence, parts[:algorithm], restore_base64_encoding(parts[:key_data])].compact.join(' ')
    end

    # Form-encoded params (application/x-www-form-urlencoded) decode '+' as spaces.
    # SSH key base64 data uses '+' characters, so we restore them here.
    def restore_base64_encoding(key_data)
      key_data.tr(' ', '+')
    end

    def normalize_key(key)
      return if key.blank?
      return key if key.match?(KEY_WITH_HOSTNAME_REGEX)

      raise InvalidHostKeyError, ["cannot determine hostname from URL for bare key"] if known_hosts_hostname.blank?

      "#{known_hosts_hostname} #{key}"
    end

    def known_hosts_hostname
      return if url.blank?

      uri = Addressable::URI.parse(url)
      host = uri.host
      return if host.blank?

      port = uri.port
      return host if port.nil? || port == STANDARD_SSH_PORT

      "[#{host}]:#{port}"
    rescue Addressable::URI::InvalidURIError
      nil
    end

View on GitHub (pinned to 55ee20384a)

When it happens

Trigger: Thrown at app/models/remote_mirrors/host_keys_converter.rb:102 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gitlabhq/gitlabhq@55ee20384a (2026-08-21). Data as JSON: /api/errors/31a7fff8f19712b7. Report an issue: GitHub.