Class: Tebako::FilesystemCache

Inherits:
Object
  • Object
show all
Defined in:
lib/tebako/filesystem_cache.rb

Overview

Stores complete DwarFS images by the content and options that produced them.

Instance Method Summary collapse

Constructor Details

#initialize(cache_dir:, mkdwarfs:, source_dir:, descriptor:, compression_level:) ⇒ FilesystemCache

Returns a new instance of FilesystemCache.



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# File 'lib/tebako/filesystem_cache.rb', line 39

def initialize(cache_dir:, mkdwarfs:, source_dir:, descriptor:, compression_level:)
  @cache_dir = cache_dir
  @mkdwarfs = mkdwarfs
  @source_dir = source_dir
  @descriptor = descriptor
  @compression_level = compression_level
end

Instance Method Details

#fetch(output) ⇒ Object

rubocop:disable Metrics/MethodLength



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# File 'lib/tebako/filesystem_cache.rb', line 47

def fetch(output) # rubocop:disable Metrics/MethodLength
  FileUtils.mkdir_p(@cache_dir)
  key = cache_key
  cache_path = File.join(@cache_dir, "#{key}.dwarfs")
  started_at = monotonic_time

  File.open("#{cache_path}.lock", File::RDWR | File::CREAT, 0o644) do |lock|
    lock.flock(File::LOCK_EX)
    if restore?(cache_path, output)
      report("reused", "filesystem inputs and compression options are unchanged", key, started_at)
      next
    end

    FileUtils.rm_f([cache_path, metadata_path(cache_path)])
    yield
    save(cache_path, output)
    report("rebuilt", "no matching packaged filesystem exists", key, started_at)
  end
end