# class Chef::Cookbook::RemoteFileVendor

## Chef::Cookbook::RemoteFileVendor¶ ↑

This FileVendor loads files by either fetching them from the local cache, or if not available, loading them from the remote server.

### Public Class Methods

new(manifest, rest) click to toggle source

    # File lib/chef/cookbook/remote_file_vendor.rb, line 28
    def initialize(manifest, rest)
      @manifest = manifest
      @cookbook_name = @manifest[:cookbook_name]
      @rest = rest
    end

### Public Instance Methods

get_filename(filename) click to toggle source

Implements abstract base’s requirement. It looks in the Chef::Config.cookbook_path file hierarchy for the requested file.

    # File lib/chef/cookbook/remote_file_vendor.rb, line 37
    def get_filename(filename)
      if filename =~ /([^\/]+)\/(.+)$/
        segment = $1
      else
        raise "get_filename: Cannot determine segment/filename for incoming filename #{filename}"
      end

      raise "No such segment #{segment} in cookbook #{@cookbook_name}" unless @manifest[segment]
      found_manifest_record = @manifest[segment].find {|manifest_record| manifest_record[:path] == filename }
      raise "No such file #{filename} in #{@cookbook_name}" unless found_manifest_record

      cache_filename = File.join("cookbooks", @cookbook_name, found_manifest_record['path'])

      # update valid_cache_entries so the upstream cache cleaner knows what
      # we've used.
      validate_cached_copy(cache_filename)

      current_checksum = nil
      if Chef::FileCache.has_key?(cache_filename)
        current_checksum = Chef::CookbookVersion.checksum_cookbook_file(Chef::FileCache.load(cache_filename, false))
      end

      # If the checksums are different between on-disk (current) and on-server
      # (remote, per manifest), do the update. This will also execute if there
      # is no current checksum.
      if current_checksum != found_manifest_record['checksum']
        raw_file = @rest.get_rest(found_manifest_record[:url], true)

        Chef::Log.debug("Storing updated #{cache_filename} in the cache.")
        Chef::FileCache.move_to(raw_file.path, cache_filename)
      else
        Chef::Log.debug("Not fetching #{cache_filename}, as the cache is up to date.")
        Chef::Log.debug("current checksum: #{current_checksum}; manifest checksum: #{found_manifest_record['checksum']})")
      end

      full_path_cache_filename = Chef::FileCache.load(cache_filename, false)

      # return the filename, not the contents (second argument= false)
      full_path_cache_filename
    end

validate_cached_copy(cache_filename) click to toggle source

    # File lib/chef/cookbook/remote_file_vendor.rb, line 78
    def validate_cached_copy(cache_filename)
      CookbookCacheCleaner.instance.mark_file_as_valid(cache_filename)
    end