Module: Prebake::Extractor

Defined in:
lib/prebake/extractor.rb

Constant Summary collapse

BINARY_EXTENSIONS = 
%w[.so .bundle .dll].freeze

Class Method Summary collapse

Class Method Details

.install(gem_path, spec) ⇒ Object 



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# File 'lib/prebake/extractor.rb', line 11

def self.install(gem_path, spec)
  Logger.debug "Extracting precompiled binaries from #{File.basename(gem_path)}"

  extracted_count = 0

  Dir.mktmpdir("prebake-extract") do |tmpdir|
    # Extract all files from the gem into a temp directory
    Gem::Package.new(gem_path).extract_files(tmpdir)

    # Copy only binary files (.so, .bundle, .dll) to extension_dir
    Dir.glob(File.join(tmpdir, "**/*.{so,bundle,dll}")).each do |binary|
      # Reject symlinks and empty files
      next if File.symlink?(binary)
      next if File.size(binary).zero?

      # Verify path is within tmpdir (prevent traversal)
      real_binary = File.realpath(binary)
      real_tmpdir = File.realpath(tmpdir)
      next unless real_binary.start_with?("#{real_tmpdir}/")

      relative = binary.sub("#{tmpdir}/", "")

      # Normalize paths from cached gems where binaries were packaged
      # from gem_dir build artifacts or dirty extension_dirs.
      # ext/<name>/<name>.so               → <name>.so       (build artifact)
      # lib/<name>/<name>.so               → <name>/<name>.so (gem lib path)
      # extension/<platform>/<ver>/<name>.so → <name>.so       (extension_dir artifact)
      relative = relative.sub(%r{\Aext/[^/]+/}, "") if relative.start_with?("ext/")
      relative = relative.sub(%r{\Alib/}, "") if relative.start_with?("lib/")
      relative = relative.sub(%r{\Aextensions?/[^/]+/[^/]+/}, "") if relative.start_with?("extension/", "extensions/")

      dest = File.join(spec.extension_dir, relative)
      FileUtils.mkdir_p(File.dirname(dest))
      FileUtils.cp(binary, dest)
      extracted_count += 1
    end
  end

  # Mark this extension_dir as prebake-managed for post-install validation
  FileUtils.touch(File.join(spec.extension_dir, ".prebake")) if extracted_count > 0

  Logger.info "Installed precompiled #{File.basename(gem_path)} " \
              "(#{extracted_count} binary files)"

  extracted_count
rescue StandardError => e
  Logger.warn "Extraction failed for #{File.basename(gem_path)}: #{e.message}"
  raise
end