Feature #6337


Added by Thomas Sawyer about 3 years ago. Updated over 2 years ago.

Assignee:Yukihiro Matsumoto


I'd like to see some sort of FileUtils#sync method to sync the contents of one directory with another.

Here is a prototype definition:

# Synchronize a destination directory with a source directory.
def sync(src, dst, options={})
  src_files = Dir[File.join(src, '**', '*')].map{ |f| f.sub(src+'/', '') }
  dst_files = Dir[File.join(dst, '**', '*')].map{ |f| f.sub(dst+'/', '') }

  removal = dst_files - src_files

  rm_dirs, rm_files = [], []
  removal.each do |f|
    path = File.join(dst, f)
    if File.directory?(path)
      rm_dirs << path
      rm_files << path

  rm_files.each { |f| rm(f) }
  rm_dirs.each  { |d| rmdir(d) }

  src_files.each do |f|
    src_path = File.join(src, f)
    dst_path = File.join(dst, f)
    if File.directory?(src_path)
      parent = File.dirname(dst_path) 
      mkdir_p(parent) unless File.directory?(parent)
      install(src_path, dst_path)

I haven't tested this beyond a simple trial. It needs improvement. For one, it probably should be able to handle regular files as arguments too. It also needs to handle verbose and dryrun options properly. Nonetheless, with improvements, would be okay for such to become new feature for FileUtils?



#1 Updated by Yusuke Endoh about 3 years ago

  • Status changed from Open to Assigned
  • Assignee set to Yukihiro Matsumoto

#2 Updated by Jeremy Kemper about 3 years ago

"Sync" can mean many things. See the long list of options on rsync's man page. This makes sense as a separate library that relies on FileUtils. It's a complex high-level feature, not a low-level "composable" operation like mv or rm.

#3 Updated by Thomas Sawyer about 3 years ago

Okay, a better name for this method is probably in order. If anyone can think of one?

@bitsweet I understand what your saying, but I'm not advocating for an implementation of rsync or anything close to it. It's just local fs method that should do little more than install present files and rm non-present files. The only option other then verbose and noop that it might support that I can think of is force.

#4 Updated by Yusuke Endoh over 2 years ago

  • Target version changed from 1.9.3 to next minor

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