Class: Chef::Cache::Checksum

Inherits:
Chef::Cache show all
Defined in:
lib/chef/cache/checksum.rb

Instance Attribute Summary

Attributes inherited from Chef::Cache

#moneta

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Chef::Cache

#initialize, #reset!

Methods included from Mixin::ConvertToClassName

#convert_to_class_name, #convert_to_snake_case, #filename_to_qualified_string, #snake_case_basename

Constructor Details

This class inherits a constructor from Chef::Cache

Class Method Details

.checksum_for_file(*args) ⇒ Object 



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# File 'lib/chef/cache/checksum.rb', line 27

def self.checksum_for_file(*args)
  instance.checksum_for_file(*args)
end

Instance Method Details

#checksum_for_file(file, key = nil) ⇒ Object 



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# File 'lib/chef/cache/checksum.rb', line 31

def checksum_for_file(file, key=nil)
  key ||= generate_key(file)
  fstat = File.stat(file)
  lookup_checksum(key, fstat) || generate_checksum(key, file, fstat)
end

#generate_checksum(key, file, fstat) ⇒ Object 



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# File 'lib/chef/cache/checksum.rb', line 46

def generate_checksum(key, file, fstat)
  checksum = checksum_file(file)
  moneta.store(key, {"mtime" => fstat.mtime.to_f, "checksum" => checksum})
  checksum
end

#generate_key(file, group = "chef") ⇒ Object 



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# File 'lib/chef/cache/checksum.rb', line 52

def generate_key(file, group="chef")
  "#{group}-file-#{file.gsub(/(#{File::SEPARATOR}|\.)/, '-')}"
end

#lookup_checksum(key, fstat) ⇒ Object 



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# File 'lib/chef/cache/checksum.rb', line 37

def lookup_checksum(key, fstat)
  cached = @moneta.fetch(key)
  if cached && file_unchanged?(cached, fstat)
    cached["checksum"]
  else
    nil
  end
end