A FileTask is a task that includes time based dependencies. If any of a FileTask's prerequisites have a timestamp that is later than the file represented by this task, then the file must be rebuilt (using the supplied actions).
Is this file task needed? Yes if it doesn't exist, or if its time stamp is out of date.
# File lib/rake/file_task.rb, line 15 def needed? ! File.exist?(name) || out_of_date?(timestamp) || @application.options.build_all end
Time stamp for file task.
# File lib/rake/file_task.rb, line 20 def timestamp if File.exist?(name) File.mtime(name.to_s) else Rake::LATE end end