Octal mode in un.rb

* lib/fileutils.rb (FileUtils#symbolic_modes_to_i): revert r55524.

* lib/un.rb (install, chmod): support octal mode string.  fix up
  r55513.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55530 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/fileutils.rb

@@ -812,7 +812,6 @@ module FileUtils
   private_module_function :apply_mask
 
   def symbolic_modes_to_i(mode_sym, path)  #:nodoc:
-    return mode_sym.oct if /\A[0-7]+\z/ =~ mode_sym
     mode = if File::Stat === path
              path.mode
            else

lib/un.rb

@@ -196,7 +196,7 @@ end
 
 def install
   setup("pm:o:g:") do |argv, options|
-    (mode = options.delete :m) and options[:mode] = mode
+    (mode = options.delete :m) and options[:mode] = /\A\d/ =~ mode ? mode.oct : mode
     options[:preserve] = true if options.delete :p
     (owner = options.delete :o) and options[:owner] = owner
     (group = options.delete :g) and options[:group] = group
@@ -216,7 +216,8 @@ end
 
 def chmod
   setup do |argv, options|
-    mode = argv.shift.oct
+    mode = argv.shift
+    mode = /\A\d/ =~ mode ? mode.oct : mode
     FileUtils.chmod mode, argv, options
   end
 end