Feature #4189


Added by trans (Thomas Sawyer) about 10 years ago. Updated almost 3 years ago.

Target version:


I wrote a method for FileUtils to do recursive hard linking. It works just like cp_r but links instead of copies.

The code can be found along with the pull request I made to ruby/ruby on Github:

It's a pretty handy method for "staging" read-only files. For example I've used it to stage test fixture files in a tmp testing location and I've used it collect together a set of files for packaging into a tarball.


fileutils_ln_r.patch (4.72 KB) fileutils_ln_r.patch zzak (Zachary Scott), 11/19/2012 07:09 AM
fileutils_cp_lr.patch (4.72 KB) fileutils_cp_lr.patch mame (Yusuke Endoh), 03/08/2018 08:29 AM

Updated by naruse (Yui NARUSE) over 9 years ago

  • Status changed from Open to Assigned
  • Assignee set to matz (Yukihiro Matsumoto)



Updated by matz (Yukihiro Matsumoto) over 9 years ago

Since ln command does not have -r option, I am kind of hesitating to add ln_r. I understand usefulness of the method. But I am not sure yet where to add (is fileutils the best place?), and what to add (is ln_r the best name for the method?).


Updated by sakuro (Sakuro OZAWA) over 9 years ago

X11 distribution has lndir command, it creates real directories and file symlinks though.

Updated by johan556 (Johan Holmberg) over 9 years ago

GNU cp has the -l option, so I think the proposed method is similiar to "cp -lr" on Linux systems.

Updated by reset (Jamie Winsor) over 8 years ago

This ticket hasn't seen action in a year, but I wanted to chime in and +1 the feature.

Having a convenience function to recursively create hard links based on a source directory is a rare need, but a need, nonetheless. I think FileUtils is a fine place for it when compared to the other choices of where to place it in Ruby core.

Updated by zzak (Zachary Scott) about 8 years ago

Adding Thomas' patch from github.

Updated by mame (Yusuke Endoh) about 8 years ago

  • Target version set to 2.6

Updated by matz (Yukihiro Matsumoto) about 3 years ago

Accepted, but I am against the name ln_r because it behaves differently from ln -r (relative).


Updated by akr (Akira Tanaka) about 3 years ago

After discussion at the developer meeting, cp_lr may be an consensus.


Updated by naruse (Yui NARUSE) about 3 years ago

  • Target version deleted (2.6)

Updated by mame (Yusuke Endoh) almost 3 years ago

I'll commit this patch that introduces FileUtils.cp_lr in a few days. Let me know if there is a problem.

Updated by mame (Yusuke Endoh) almost 3 years ago

  • Assignee changed from matz (Yukihiro Matsumoto) to mame (Yusuke Endoh)

Updated by mame (Yusuke Endoh) almost 3 years ago

  • Status changed from Assigned to Closed

Applied in changeset trunk|r62739.

Add FileUtils#cp_lr

  • lib/fileutils.rb: Add FileUtils#cp_lr. This method creates hard links of each file from directory to another directory recursively. This patch is based on Thomas Sawyers and Zachary Scott. [Feature #4189] [ruby-core:33820]

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