[ruby-core:26029] [Feature #2190] FileUtils::chmod - allow symbolic mode

Feature #2190: FileUtils::chmod - allow symbolic mode
http://redmine.ruby-lang.org/issues/show/2190

Author: Suraj Kurapati
Status: Open, Priority: Normal

Hello,

I request that FileUtils::chmod() and FileUtils::chmod_R() accept 
symbolic modes, which are strings like "u+x,g-w,o=" (see "symbolic 
mode" in `man chmod` for details), in addition to the numeric modes 
they currently accept.

If my request is fulfilled, the following would be equivalent:

  FileUtils::chmod(0712, "file.txt")

  FileUtils::chmod("u=rwx,g=x,o=w", "file.txt")

In addition, symbolic modes would allow delta/patch changes:

  FileUtils::chmod("g+w", "file.txt")

This is not so easy with numeric modes, because you must
first read the current mode, apply your delta/patch mode
using a bitwise OR operation, and finally apply the new
numeric mode using FileUtils::chmod().

Thanks for your consideration.


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