ruby/rubygems · error · Gem::InstallError

cargo metadata failed #{error.message}

Error message

cargo metadata failed #{error.message}

What it means

Error "cargo metadata failed #{error.message}" thrown in ruby/rubygems.

Source

Thrown at lib/rubygems/ext/cargo_builder.rb:210

  def cargo_dylib_path(dest_path, crate_name)
    so_ext = RbConfig::CONFIG["SOEXT"]
    prefix = so_ext == "dll" ? "" : "lib"
    path_parts = [dest_path]
    path_parts << ENV["CARGO_BUILD_TARGET"] if ENV["CARGO_BUILD_TARGET"]
    path_parts += ["release", "#{prefix}#{crate_name}.#{so_ext}"]
    File.join(*path_parts)
  end

  def cargo_crate_name(cargo_dir, manifest_path, results)
    require "open3"
    Gem.load_yaml

    output, status =
      begin
        Open3.capture2e(cargo, "metadata", "--no-deps", "--format-version", "1", chdir: cargo_dir)
      rescue StandardError => error
        raise Gem::InstallError, "cargo metadata failed #{error.message}"
      end

    unless status.success?
      if Gem.configuration.really_verbose
        puts output
      else
        results << output
      end

      exit_reason =
        if status.exited?
          ", exit code #{status.exitstatus}"
        elsif status.signaled?
          ", uncaught signal #{status.termsig}"
        end

      raise Gem::InstallError, "cargo metadata failed#{exit_reason}"
    end

View on GitHub (pinned to 86cbb817a3)

When it happens

Trigger: Thrown at lib/rubygems/ext/cargo_builder.rb:210 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/6ba16cd802e0cba3. Report an issue: GitHub.