Commits on Jun 28, 2022

1. Add new "Atomic File Operations" rule …

   When doing file operations after confirming the existence check of a file,
   frequent parallel file operations may cause problems that are difficult to reproduce.
   Therefore, it is preferable to use atomic file operations.
   
   ```ruby
   # bad - race condition with another process may result in an error in `mkdir`
   unless Dir.exist?(path)
     FileUtils.mkdir(path)
   end
   
   # good - atomic and idempotent creation
   FileUtils.mkdir_p(path)
   
   # bad - race condition with another process may result in an error in `remove`
   if File.exist?(path)
     FileUtils.remove(path)
   end
   
   # good - atomic and idempotent removal
   FileUtils.rm_f(path)
   ```

   

   ydah committed Jun 28, 2022
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