ruby/rubygems · error · Gem::Package::FormatError

#{e.message} in #{path}

Error message

#{e.message} in #{path}

What it means

Error "#{e.message} in #{path}" thrown in ruby/rubygems.

Source

Thrown at lib/rubygems/package.rb:354

    @contents = []

    @gem.with_read_io do |io|
      gem_tar = Gem::Package::TarReader.new io

      gem_tar.each do |entry|
        next unless entry.full_name == "data.tar.gz"

        open_tar_gz entry do |pkg_tar|
          pkg_tar.each do |contents_entry|
            @contents << contents_entry.full_name
          end
        end

        return @contents
      end
    end
  rescue Zlib::GzipFile::Error, EOFError, Gem::Package::TarInvalidError => e
    raise Gem::Package::FormatError.new e.message, @gem
  end

  ##
  # Creates a digest of the TarEntry +entry+ from the digest algorithm set by
  # the security policy.

  def digest(entry) # :nodoc:
    algorithms = if @checksums
      @checksums.to_h {|algorithm, _| [algorithm, Gem::Security.create_digest(algorithm)] }
    elsif Gem::Security::DIGEST_NAME
      { Gem::Security::DIGEST_NAME => Gem::Security.create_digest(Gem::Security::DIGEST_NAME) }
    end

    return @digests if algorithms.nil? || algorithms.empty?

    buf = String.new(capacity: 16_384, encoding: Encoding::BINARY)
    until entry.eof?
      entry.readpartial(16_384, buf)

View on GitHub (pinned to 86cbb817a3)

Solutions

1. Fix the underlying error reported for the given path (usually a corrupt or unreadable file inside the package)

When it happens

Trigger: Thrown at lib/rubygems/package.rb:354 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ruby/rubygems@86cbb817a3 (2026-08-23). Data as JSON: /api/errors/2869eb8d2e7170a6. Report an issue: GitHub.